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Articles 1 - 30 of 61
Full-Text Articles in Physical Sciences and Mathematics
Directed Energy Missions For Planetary Defense, Philip Lubin, Gary Hughes, Mike Eskenazi, Kelly Kosmo, Isabella Johansson, Janelle Griswold, Mark Pryor, Hugh O'Neill, Peter Meinhold, Johnathan Suen, Jordan Riley, Qicheng Zhang, Kevin Walsh, Carl Melis, Miikka Kangas, Caio Motta, Travis Brashears
Directed Energy Missions For Planetary Defense, Philip Lubin, Gary Hughes, Mike Eskenazi, Kelly Kosmo, Isabella Johansson, Janelle Griswold, Mark Pryor, Hugh O'Neill, Peter Meinhold, Johnathan Suen, Jordan Riley, Qicheng Zhang, Kevin Walsh, Carl Melis, Miikka Kangas, Caio Motta, Travis Brashears
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Directed energy for planetary defense is now a viable option and is superior in many ways to other proposed technologies, being able to defend the Earth against all known threats. This paper presents basic ideas behind a directed energy planetary defense system that utilizes laser ablation of an asteroid to impart a deflecting force on the target. A conceptual philosophy called DE-STAR, which stands for Directed Energy System for Targeting of Asteroids and exploration, is an orbiting stand-off system, which has been described in other papers. This paper describes a smaller, stand-on system known as DE-STARLITE as a reduced-scale version …
A Fast High-Precision Six-Degree-Of-Freedom Relative Position Sensor, Gary B. Hughes, Van P. Macasaet, Janelle Griswold, Claudia A. Sison, Philip Lubin, Peter Meinhold, Johnathan Suen, Travis Brashears, Qicheng Zhang, Jonathan Madajian
A Fast High-Precision Six-Degree-Of-Freedom Relative Position Sensor, Gary B. Hughes, Van P. Macasaet, Janelle Griswold, Claudia A. Sison, Philip Lubin, Peter Meinhold, Johnathan Suen, Travis Brashears, Qicheng Zhang, Jonathan Madajian
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Lasers are commonly used in high-precision measurement and profiling systems. Some laser measurement systems are based on interferometry principles, and others are based on active triangulation, depending on requirements of the application. This paper describes an active triangulation laser measurement system for a specific application wherein the relative position of two fixed, rigid mechanical components is to be measured dynamically with high precision in six degrees of freedom (DOF). Potential applications include optical systems with feedback to control for mechanical vibration, such as target acquisition devices with multiple focal planes. The method uses an array of several laser emitters mounted …
Orbital Simulations On Deflecting Near Earth Objects By Directed Energy, Qicheng Zhang, Kevin J. Walsh, Carl Melis, Gary Hughes, Philip M. Lubin
Orbital Simulations On Deflecting Near Earth Objects By Directed Energy, Qicheng Zhang, Kevin J. Walsh, Carl Melis, Gary Hughes, Philip M. Lubin
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Laser ablation of a near-Earth object (NEO) on a collision course with Earth produces a cloud of ejecta that exerts a thrust on the NEO, deflecting it from its original trajectory. Ablation may be performed from afar by illuminating an Earth-targeting asteroid or comet with a stand-off "DE-STAR" system consisting of a large phased-array laser in Earth orbit. Alternatively, a much smaller stand-on "DE-STARLITE" system may travel alongside the target, slowly deflecting it from nearby over a long period. This paper presents orbital simulations comparing the effectiveness of both systems across a range of laser and NEO parameters. Simulated parameters …
Orbital Simulations On Deflecting Near-Earth Objects By Directed Energy, Qicheng Zhang, Kevin J. Walsh, Carl Melis, Gary B. Hughes, Philip M. Lubin
Orbital Simulations On Deflecting Near-Earth Objects By Directed Energy, Qicheng Zhang, Kevin J. Walsh, Carl Melis, Gary B. Hughes, Philip M. Lubin
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Laser ablation of a Near Earth Object (NEO) on a collision course with Earth produces a cloud of ejecta which exerts a thrust on the NEO, deflecting it from its original trajectory. Ablation may be performed from afar by illuminating an Earth-targeting asteroid or comet with a stand-off “DE-STAR” system consisting of a large phased-array laser in Earth orbit. Alternatively, a much smaller stand-on “DE-STARLITE” system may travel alongside the target, slowly deflecting it from nearby over a long period. This paper presents orbital simulations comparing the effectiveness of both systems across a range of laser and NEO parameters. Simulated …
Orbital Simulations On The Deflection Of Near Earth Objects By Directed Energy, Qicheng Zhang, Kevin J. Walsh, Carl Melis, Gary Hughes, Philip Lubin
Orbital Simulations On The Deflection Of Near Earth Objects By Directed Energy, Qicheng Zhang, Kevin J. Walsh, Carl Melis, Gary Hughes, Philip Lubin
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Laser ablation of a Near Earth Object (NEO) on a collision course with Earth produces a cloud of ejecta which exerts a thrust on the asteroid, deflecting it from its original trajectory. The DE-STAR system provides such a thrust by illuminating an Earth-targeting asteroid or comet from afar with a stand-off system consisting of a large phased-array laser in Earth orbit. A much smaller version of the same system called DE-STARLITE travels alongside the target, operating in a stand-on mode, slowly deflecting it over a long period. Such a stand-on system would also permit directing the thrust in any desired …
Orbital Simulations Of Laser-Propelled Spacecraft, Qicheng Zhang, Kevin J. Walsh, Carl Melis, Gary B. Hughes, Philip M. Lubin
Orbital Simulations Of Laser-Propelled Spacecraft, Qicheng Zhang, Kevin J. Walsh, Carl Melis, Gary B. Hughes, Philip M. Lubin
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Spacecraft accelerate by directing propellant in the opposite direction. In the traditional approach, the propellant is carried on board in the form of material fuel. This approach has the drawback of being limited in Delta v by the amount of fuel launched with the craft, a limit that does not scale well to high Delta v due to the massive nature of the fuel. Directed energy photon propulsion solves this problem by eliminating the need for on-board fuel storage. We discuss our system which uses a phased array of lasers to propel the spacecraft which contributes no mass to the …
Local Phase Control For A Planar Array Of Fiber Laser Amplifiers, Patrick Steffanic, Benjamin T. Johannes, Claudia A. Sison, Gary Hughes, Philip Lubin, Peter Meinhold, Johnathan Suen, Hugh O'Neill, Miikka Kangas, Travis Brashears, Qicheng Zhang, Janelle Griswold, Jordan Riley, Caio Motta
Local Phase Control For A Planar Array Of Fiber Laser Amplifiers, Patrick Steffanic, Benjamin T. Johannes, Claudia A. Sison, Gary Hughes, Philip Lubin, Peter Meinhold, Johnathan Suen, Hugh O'Neill, Miikka Kangas, Travis Brashears, Qicheng Zhang, Janelle Griswold, Jordan Riley, Caio Motta
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Arrays of phase-locked lasers have been developed for numerous directed-energy applications. Phased-array designs are capable of producing higher beam intensity than similar sized multi-beam emitters, and also allow beam steering and beam profile manipulation. In phased-array designs, individual emitter phases must be controllable, based on suitable feedback. Most current control schemes sample individual emitter phases, such as with an array-wide beam splitter, and compare to a master phase reference. Reliance on a global beam splitter limits scalability to larger array sizes due to lack of design modularity. This paper describes a conceptual design and control scheme that relies only on …
Simulations Of Directed Energy Thrust On Rotating Asteroids, Janelle Griswold, Jonathan Madajian, Isabella Johansson, Krysten Pfau, Philip Lubin, Gary B. Hughes, Aidan Gilkes, Peter Meinhold, Caio Motta, Travis Brashears, Qicheng Zhang
Simulations Of Directed Energy Thrust On Rotating Asteroids, Janelle Griswold, Jonathan Madajian, Isabella Johansson, Krysten Pfau, Philip Lubin, Gary B. Hughes, Aidan Gilkes, Peter Meinhold, Caio Motta, Travis Brashears, Qicheng Zhang
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Asteroids that threaten Earth could be deflected from their orbits using directed energy to vaporize the surface, as the ejected plume creates a reaction thrust that alters the asteroid’s trajectory. In this situation, a critical issue is the rotation of the asteroid relative to the directed energy beam, as this will reduce the average thrust magnitude and modify the thrust direction. Flux levels required to evaporate surface material depend on the surface material composition, rotation rate, albedo, and thermal and bulk mechanical properties of the asteroid. The observed distribution of asteroid rotation rates is used, along with an estimated range …
Directed Energy Interstellar Propulsion Of Wafersats, Travis Brashears, Philip Lubin, Gary B. Hughes, Kyle Mcdonough, Sebastian Arias, Alex Lang, Caio Motta, Peter Meinhold, Payton Batliner, Janelle Griswold, Qicheng Zhang, Yusuf Alnawakhtha, Kenyon Prater, Jonathan Madajian, Olivia Sturman, Jana Gergieva, Aidan Gilkes, Bret Silverstein
Directed Energy Interstellar Propulsion Of Wafersats, Travis Brashears, Philip Lubin, Gary B. Hughes, Kyle Mcdonough, Sebastian Arias, Alex Lang, Caio Motta, Peter Meinhold, Payton Batliner, Janelle Griswold, Qicheng Zhang, Yusuf Alnawakhtha, Kenyon Prater, Jonathan Madajian, Olivia Sturman, Jana Gergieva, Aidan Gilkes, Bret Silverstein
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In the nearly 60 years of spaceflight we have accomplished wonderful feats of exploration and shown the incredible spirit of the human drive to explore and understand our universe. Yet in those 60 years we have barely left our solar system with the Voyager 1 spacecraft launched in 1977 finally leaving the solar system after 37 years of flight at a speed of 17 km/s or less than 0.006% the speed of light. As remarkable as this is, we will never reach even the nearest stars with our current propulsion technology in even 10 millennium. We have to radically rethink …
Local Phase Control For A Planar Array Of Fiber Laser Amplifiers, Patrick Steffanic, Benjamin T. Johannes, Claudia A. Sison, Gary B. Hughes, Philip Lubin, Peter Meinhold, Johnathan Suen, Hugh O'Neill, Miikka Kangas, Travis Brashears, Qicheng Zhang, Janelle Griswold, Jordan Riley, Caio Motta
Local Phase Control For A Planar Array Of Fiber Laser Amplifiers, Patrick Steffanic, Benjamin T. Johannes, Claudia A. Sison, Gary B. Hughes, Philip Lubin, Peter Meinhold, Johnathan Suen, Hugh O'Neill, Miikka Kangas, Travis Brashears, Qicheng Zhang, Janelle Griswold, Jordan Riley, Caio Motta
Statistics
Arrays of phase-locked lasers have been developed for numerous directed-energy applications. Phased-array designs are capable of producing higher beam intensity than similar sized multi-beam emitters, and also allow beam steering and beam profile manipulation. In phased-array designs, individual emitter phases must be controllable, based on suitable feedback. Most current control schemes sample individual emitter phases, such as with an array-wide beam splitter, and compare to a master phase reference. Reliance on a global beam splitter limits scalability to larger array sizes due to lack of design modularity. This paper describes a conceptual design and control scheme that relies only on …
Stand-Off Molecular Composition Analysis, Gary B. Hughes, Philip Lubin, Peter Meinhold, Hugh O'Neill, Travis Brashears, Qicheng Zhang, Janelle Griswold, Jordan Riley, Caio Motta
Stand-Off Molecular Composition Analysis, Gary B. Hughes, Philip Lubin, Peter Meinhold, Hugh O'Neill, Travis Brashears, Qicheng Zhang, Janelle Griswold, Jordan Riley, Caio Motta
Statistics
Composition of distant stars can be explored by observing absorption spectra. Stars produce nearly blackbody radiation that passes through the cloud of vaporized material surrounding the star. Characteristic absorption lines are discernible with a spectrometer, and atomic composition is investigated by comparing spectral observations with known material profiles. Most objects in the solar system—asteroids, comets, planets, moons—are too cold to be interrogated in this manner. Material clouds around cold objects consist primarily of volatiles, so bulk composition cannot be probed. Additionally, low volatile density does not produce discernible absorption lines in the faint signal generated by cold objects. We propose …
Directed Energy Deflection Laboratory Measurements, Travis Brashears, Philip Lubin, Gary B. Hughes, Peter Meinhold, Jonathan Suen, Payton Batliner, Caio Motta, Janelle Griswold, Miikka Kangas, Isabella Johansson, Yusuf Alnawakhtha, Kenyon Prater, Alex Lang, Jonathan Madajian
Directed Energy Deflection Laboratory Measurements, Travis Brashears, Philip Lubin, Gary B. Hughes, Peter Meinhold, Jonathan Suen, Payton Batliner, Caio Motta, Janelle Griswold, Miikka Kangas, Isabella Johansson, Yusuf Alnawakhtha, Kenyon Prater, Alex Lang, Jonathan Madajian
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We report on laboratory studies of the effectiveness of directed energy planetary defense as a part of the DE-STAR (Directed Energy System for Targeting of Asteroids and exploRation) program. DE-STAR and DE-STARLITE are directed energy "stand-off" and "stand-on" programs, respectively. These systems consist of a modular array of kilowatt-class lasers powered by photovoltaics, and are capable of heating a spot on the surface of an asteroid to the point of vaporization. Mass ejection, as a plume of evaporated material, creates a reactionary thrust capable of diverting the asteroid’s orbit. In a series of papers, we have developed a theoretical basis …
Directed Energy For Relativistic Propulsion And Interstellar Communications, Philip Lubin, Gary Hughes, J Bible, Isabella Johansson
Directed Energy For Relativistic Propulsion And Interstellar Communications, Philip Lubin, Gary Hughes, J Bible, Isabella Johansson
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An orbital planetary defense system that is also capable of beamed power propulsion allows mildly relativistic spacecraft speeds using existing technologies. While designed to heat the surface of potentially hazardous objects to the evaporation point to mitigate asteroid threats the system is inherently multi-functional with one mode being relativistic beamed spacecraft propulsion. The system is called DE-STAR for Directed Energy Solar Targeting of Asteroids and exploRation. DE-STAR is a proposed orbital platform that is a modular phased array of lasers, powered by the sun. Modular design allows for incremental development, test and initial deployment, lowering cost, minimizing risk and allowing …
Orbital Simulations For Directed Energy Deflection Of Near-Earth Asteroids, Qicheng Zhang, Kevin J. Walsh, Carl Melis, Gary B. Hughes, Philip Lubin
Orbital Simulations For Directed Energy Deflection Of Near-Earth Asteroids, Qicheng Zhang, Kevin J. Walsh, Carl Melis, Gary B. Hughes, Philip Lubin
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Directed energy laser ablation at the surface of an asteroid or comet produces an ejection plume that will impart a thrust on the asteroid. This thrust can mitigate a threatened collision with the Earth. This technique uses the asteroid itself as the deflection propellant. The DESTAR laser system is designed to produce a sufficiently intense spot on the surface of an asteroid to accomplish this in one of two operational modes. One is a complete "stand-off" mode where a large space based phased-array laser directed energy system can interdict asteroids at large distances allowing sufficient time to mitigate nearly all …
Directed Energy Planetary Defense, Kelly Kosmo, Philip Lubin, Gary B. Hughes, Janelle Griswold, Qicheng Zhang, Travis Brashears
Directed Energy Planetary Defense, Kelly Kosmo, Philip Lubin, Gary B. Hughes, Janelle Griswold, Qicheng Zhang, Travis Brashears
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Directed Energy (DE) systems offer the potential for true planetary defense from small to km class threats. Directed energy has evolved dramatically recently and is on an extremely rapid ascent technologically. It is now feasible to consider DE systems for threats from asteroids and comets. DE-STAR (Directed Energy System for Targeting of Asteroids and exploration) is a phased-array laser directed energy system intended for illumination, deflection and compositional analysis of asteroids [1]. It can be configured either as a stand-on or a distant stand-off system. A system of appropriate size would be capable of projecting a laser spot onto the …
Bayesian Estimation Of Asymmetric Jump-Diffusion Processes, Samuel J. Frame, Cyrus A. Ramezani
Bayesian Estimation Of Asymmetric Jump-Diffusion Processes, Samuel J. Frame, Cyrus A. Ramezani
Statistics
The hypothesis that asset returns are normally distributed has been widely rejected. The literature has shown that empirical a<>set returns are highly skewed and Ieptokurtic. The affine jump-diffusion (AJD) model improves upon the normal specification by adding a jump component to the price process. Two important extensions proposed by Ramezani and Zeng (1998) and Kou (2002) further improve the AJD specification by having two jump components in the price process, resulting in the asymmetric affine jump-diffusion (AAJD) specification. The AAJD specification allows the probability distribution of the returns to be asymmetrical. That is, the tails of the distribution are …
Boresight Alignment Station, Marco A. Scussat, Richard M. Goeden, Jeffrey S. Scott, Richard G. Lane, Gary B. Hughes
Boresight Alignment Station, Marco A. Scussat, Richard M. Goeden, Jeffrey S. Scott, Richard G. Lane, Gary B. Hughes
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A boresight alignment system facilitates aligning a plurality of cameras and/or images of the cameras with respect to one another. The system may have a mount configured to facilitate attachment of a bezel containing a plurality of cameras to the mount. The system may have a plurality of targets and each target may be configured to provide light of at least two different wavelengths and/or ranges of wavelengths. One or more baffles may be disposed optically between the mount and the target assembly to inhibit stray light from being incident upon the cameras.
Directed Energy Active Illumination For Near-Earth Object Detection, Jordan Riley, Philip Lubin, Gary B. Hughes, Hugh O'Neill, Peter Meinhold, Jonathan Suen, J Bible, Isabella E. Johansson, Janelle Griswold, Brianna Cook
Directed Energy Active Illumination For Near-Earth Object Detection, Jordan Riley, Philip Lubin, Gary B. Hughes, Hugh O'Neill, Peter Meinhold, Jonathan Suen, J Bible, Isabella E. Johansson, Janelle Griswold, Brianna Cook
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On 15 February 2013, a previously unknown ~20 m asteroid struck Earth near Chelyabinsk, Russia, releasing kinetic energy equivalent to ~570 kt TNT. Detecting objects like the Chelyabinsk impactor that are orbiting near Earth is a difficult task, in part because such objects spend much of their own orbits in the direction of the Sun when viewed from Earth. Efforts aimed at protecting Earth from future impacts will rely heavily on continued discovery. Ground-based optical observatory networks and Earth-orbiting spacecraft with infrared sensors have dramatically increased the pace of discovery. Still, less than 5% of near-Earth objects (NEOs) 100 m/~100 …
Optical Modeling For A Laser Phased-Array Directed Energy System, Gary B. Hughes, Philip Lubin, Janelle Griswold, Brianna Cook, Durante Bozzini, Hugh O'Neill, Peter Meinhold, Jonathan Suen, J Bible, Jordan Riley, Isabella E. Johansson, Mark Pryor, Miikka Kangas
Optical Modeling For A Laser Phased-Array Directed Energy System, Gary B. Hughes, Philip Lubin, Janelle Griswold, Brianna Cook, Durante Bozzini, Hugh O'Neill, Peter Meinhold, Jonathan Suen, J Bible, Jordan Riley, Isabella E. Johansson, Mark Pryor, Miikka Kangas
Statistics
We present results of optical simulations for a laser phased array directed energy system. The laser array consists of individual optical elements in a square or hexagonal array. In a multi-element array, the far-field beam pattern depends on both mechanical pointing stability and on phase relationships between individual elements. The simulation incorporates realistic pointing and phase errors. Pointing error components include systematic offsets to simulate manufacturing and assembly variations. Pointing also includes time-varying errors that simulate structural vibrations, informed from random vibration analysis of the mechanical design. Phase errors include systematic offsets, and time-varying errors due to both mechanical vibration …
De-Starlite: A Directed Energy Planetary Defense Mission, Kelly Kosmo, Mark Pryor, Philip Lubin, Gary B. Hughes, Hugh O'Neill, Peter Meinhold, Jonathan Suen, Jordan Riley, Janelle Griswold, Brianna Vail Cook, Isabella E. Johansson, Qicheng Zhang, Kevin Walsh, Carl Melis, Miikka Kangas, J Bible, Caio Motta, Travis Brashears, Shana Mathew, Justin Bollag
De-Starlite: A Directed Energy Planetary Defense Mission, Kelly Kosmo, Mark Pryor, Philip Lubin, Gary B. Hughes, Hugh O'Neill, Peter Meinhold, Jonathan Suen, Jordan Riley, Janelle Griswold, Brianna Vail Cook, Isabella E. Johansson, Qicheng Zhang, Kevin Walsh, Carl Melis, Miikka Kangas, J Bible, Caio Motta, Travis Brashears, Shana Mathew, Justin Bollag
Statistics
This paper presents the motivation behind and design of a directed energy planetary defense system that utilizes laser ablation of an asteroid to impart a deflecting force on the target. The proposed system is called DE-STARLITE for Directed Energy System for Targeting of Asteroids and ExploRation – LITE as it is a small, stand-on unit of a larger standoff DE-STAR system. Pursuant to the stand-on design, ion engines will propel the spacecraft from low-Earth orbit (LEO) to the near-Earth asteroid (NEA). During laser ablation, the asteroid itself becomes the "propellant"; thus a very modest spacecraft can deflect an asteroid much …
Toward Directed Energy Planetary Defense, Philip Lubin, Gary B. Hughes, J Bible, Jesse Bublitz, Josh Arriola, Caio Motta, Jon Suen, Isabella Johansson, Jordan Riley, Nilou Sarvian, Deborah Clayton-Warwick, Jane Wu, Andrew Milich, Mitch Oleson, Mark Pryor, Peter Krogen, Miikka Kangas, Hugh O'Neill
Toward Directed Energy Planetary Defense, Philip Lubin, Gary B. Hughes, J Bible, Jesse Bublitz, Josh Arriola, Caio Motta, Jon Suen, Isabella Johansson, Jordan Riley, Nilou Sarvian, Deborah Clayton-Warwick, Jane Wu, Andrew Milich, Mitch Oleson, Mark Pryor, Peter Krogen, Miikka Kangas, Hugh O'Neill
Statistics
Asteroids and comets that cross Earth’s orbit pose a credible risk of impact, with potentially severe disturbances to Earth and society. We propose an orbital planetary defense system capable of heating the surface of potentially hazardous objects to the vaporization point as a feasible approach to impact risk mitigation. We call the system DE-STAR, for Directed Energy System for Targeting of Asteroids and exploration. The DESTAR is a modular-phased array of kilowatt class lasers powered by photovoltaics. Modular design allows for incremental development, minimizing risk, and allowing for technological codevelopment. An orbiting structure would be developed in stages. The main …
Calculating Ellipse Overlap Areas, Gary B. Hughes, Mohcine Chraibi
Calculating Ellipse Overlap Areas, Gary B. Hughes, Mohcine Chraibi
Statistics
We present an approach for finding the overlap area between two ellipses that does not rely on proxy curves. The Gauss-Green formula is used to determine a segment area between two points on an ellipse. Overlap between two ellipses is calculated by combining the areas of appropriate segments and polygons in each ellipse. For four of the ten possible orientations of two ellipses, the method requires numerical determination of transverse intersection points. Approximate intersection points can be determined by solving the two implicit ellipse equations simultaneously. Alternative approaches for finding transverse intersection points are available using tools from algebraic geometry, …
De-Star: Phased-Array Laser Technology For Planetary Defense And Other Scientific Purposes, Gary B. Hughes, Philip Lubin, J Bible, Jesse Bublitz, Josh Arriola, Caio Motta, Jon Suen, Isabella Johansson, Jordan Riley, Nilou Sarvian, Jan Wu, Deborah Clayton-Warwick, Andrew Milich, Mitch Oleson, Mikka Kangas, Mark Pryor, Peter Krogen
De-Star: Phased-Array Laser Technology For Planetary Defense And Other Scientific Purposes, Gary B. Hughes, Philip Lubin, J Bible, Jesse Bublitz, Josh Arriola, Caio Motta, Jon Suen, Isabella Johansson, Jordan Riley, Nilou Sarvian, Jan Wu, Deborah Clayton-Warwick, Andrew Milich, Mitch Oleson, Mikka Kangas, Mark Pryor, Peter Krogen
Statistics
Current strategies for diverting threatening asteroids require dedicated operations for every individual object. We propose a stand-off, Earth-orbiting system capable of vaporizing the surface of asteroids as a futuristic but feasible approach to impact risk mitigation. We call the system DE-STAR (Directed Energy System for Targeting of Asteroids and exploRation). DE-STAR is a modular phased array of laser amplifiers, powered by solar photovoltaic panels. Lowcost development of test systems is possible with existing technology. Larger arrays could be tested in sub-orbital demonstrations, leading eventually to an orbiting system. Design requirements are established by seeking to vaporize the surface of an …
Relativistic Propulsion Using Directed Energy, J Bible, Isabella Johansson, Gary B. Hughes, Philip M. Lubin
Relativistic Propulsion Using Directed Energy, J Bible, Isabella Johansson, Gary B. Hughes, Philip M. Lubin
Statistics
We propose a directed energy orbital planetary defense system capable of heating the surface of potentially hazardous objects to the evaporation point as a futuristic but feasible approach to impact risk mitigation. The system is based on recent advances in high efficiency photonic systems. The system could also be used for propulsion of kinetic or nuclear tipped asteroid interceptors or other interplanetary spacecraft. A photon drive is possible using direct photon pressure on a spacecraft similar to a solar sail. Given a laser power of 70GW, a 100 kg craft can be propelled to 1AU in approximately 3 days achieving …
Directed Energy Planetary Defense, Philip Lubin, Gary B. Hughes, J Bible, Jesse Bublitz, Josh Arriola, Caio Motta, Jon Suen, Isabella Johansson, Jordan Riley, Nilou Sarvian, Deborah Clayton-Warwick, Jane Wu, Andrew Milich, Mitch Oleson, Mikka Kangas, Mark Pryor, Peter Krogen
Directed Energy Planetary Defense, Philip Lubin, Gary B. Hughes, J Bible, Jesse Bublitz, Josh Arriola, Caio Motta, Jon Suen, Isabella Johansson, Jordan Riley, Nilou Sarvian, Deborah Clayton-Warwick, Jane Wu, Andrew Milich, Mitch Oleson, Mikka Kangas, Mark Pryor, Peter Krogen
Statistics
Asteroids and comets that cross Earth’s orbit pose a credible risk of impact, with potentially severe disturbances to Earth and society. Numerous risk mitigation strategies have been described, most involving dedicated missions to a threatening object. We propose an orbital planetary defense system capable of heating the surface of potentially hazardous objects to the vaporization point as a feasible approach to impact risk mitigation. We call the system DE-STAR for Directed Energy System for Targeting of Asteroids and exploRation. DE-STAR is a modular phased array of kilowatt class lasers powered by photovoltaic's. Modular design allows for incremental development, test, and …
Sensor Calibration Systems And Methods For Infrared Cameras, George Speake, Nuwan Nagahawatte, Richard M. Goeden, Ted Takagi, Robert Ernst, Gary B. Hughes, Joseph Kostrzewa, John Graff, Russell Granneman, Michael Kent, Neela Nalam, Stephen Lyon, Barbara Sharp, Pierre Boulanger, Neil Cuteliffe, Tim Martin, Ted Hoelter
Sensor Calibration Systems And Methods For Infrared Cameras, George Speake, Nuwan Nagahawatte, Richard M. Goeden, Ted Takagi, Robert Ernst, Gary B. Hughes, Joseph Kostrzewa, John Graff, Russell Granneman, Michael Kent, Neela Nalam, Stephen Lyon, Barbara Sharp, Pierre Boulanger, Neil Cuteliffe, Tim Martin, Ted Hoelter
Statistics
Systems and methods directed to calibration techniques for infrared cameras are disclosed for some embodiments. For example, a method of determining infrared sensor calibration information, in accordance with an embodiment, includes performing a calibration operation on an infrared sensor to obtain calibration information, wherein the infrared sensor is not within an infrared camera core, and storing the calibration information.
The Transient Optical Sky Survey Data Pipeline, Elena Hadjiyska, Gary B. Hughes, Philip Lubin, Scott Taylor, Rory Hartong-Redden, Joshua Zierten
The Transient Optical Sky Survey Data Pipeline, Elena Hadjiyska, Gary B. Hughes, Philip Lubin, Scott Taylor, Rory Hartong-Redden, Joshua Zierten
Statistics
The Transient Optical Sky Survey (TOSS) is an automated, ground-based telescope system dedicated to searching for optical transient events. Small telescope tubes are mounted on a tracking, semi-equatorial frame with a single polar axis. Each fixed-declination telescope records successive exposures which overlap in right ascension. Nightly observations produce time-series images of fixed fields within each declination band. We describe the TOSS data pipeline, including automated routines used for image calibration, object detection and identification, astrometry, and differential photometry. Time series of nightly observations are accumulated in a database for each declination band. Despite the modest cost of the mechanical system, …
Filtering Systems & Methods For Infrared Image Processing, Gary B. Hughes, Nicholas Högasten, Nuwan Nagahawatte
Filtering Systems & Methods For Infrared Image Processing, Gary B. Hughes, Nicholas Högasten, Nuwan Nagahawatte
Statistics
Systems and methods are disclosed herein to provide filtering techniques for image processing applications. For example, in accordance with an embodiment of the present invention, a Median-X filtering algorithm is disclosed that may be used for various infrared image processing applications.
Characterization Of The Differentiation And Leptin Secretion Profile Of Adult Stem Cells On Patterned Polylactide Films, Aditya Chaubey, Kevin J. Ross, Malcolm R. Leadbetter, Cheryl T. Gomillion, Karen J.L. Burg
Characterization Of The Differentiation And Leptin Secretion Profile Of Adult Stem Cells On Patterned Polylactide Films, Aditya Chaubey, Kevin J. Ross, Malcolm R. Leadbetter, Cheryl T. Gomillion, Karen J.L. Burg
Statistics
Several issues need to be better understood before breast tissue engineering becomes a clinically viable option. One of the most important aspects is the interaction between cells and the microtopography of the implant surface. The aim of this study was to evaluate the efficacy of D1 cells, multipotent mouse bone marrow stromal precursors, in differentiating to adipocytes and to characterize their metabolic activity (lactic acid released and glucose consumed), leptin secretion and lipid production when cultured on patterned poly(L-lactide) (PLLA) films. It was determined that, by appropriate stimulation, the D1 cells displayed morphological characteristics of adipocytes and produced lipid. The …
Calibration Systems And Methods For Infrared Cameras, Russell Granneman, Nuwan Nagahawatte, Richard M. Goeden, Ted Takagi, Robert Ernst, Gary B. Hughes, Joseph Kostrzewa, John Graff, George Speake, Michael Kent, Neela Nalam, Stephen Lyon, Barbara Sharp, Pierre Boulanger, Neil Cutcliffe, Tim Martin, Ted Hoelter
Calibration Systems And Methods For Infrared Cameras, Russell Granneman, Nuwan Nagahawatte, Richard M. Goeden, Ted Takagi, Robert Ernst, Gary B. Hughes, Joseph Kostrzewa, John Graff, George Speake, Michael Kent, Neela Nalam, Stephen Lyon, Barbara Sharp, Pierre Boulanger, Neil Cutcliffe, Tim Martin, Ted Hoelter
Statistics
Systems and methods directed to calibration techniques for infrared cameras are disclosed. For example, a method of obtaining calibration information for an infrared device includes providing a calibration target adapted to provide a low-emissivity scene; performing a calibration operation on the infrared device to obtain the calibration information; and storing the calibration information.