Engineering Commons^™

Power Optimization Of Solar Powered Standalone Wireless Sensor System, Rajan Amatya

Masters Theses

Wireless sensor systems are common in applications where harsh environmental conditions or remote locations make it difficult to run wires. Having these sensor systems self-powered is essential as it is difficult for battery replacement. Using solar as an alternative source of energy can be a medium to charge the battery in such scenarios. With an increasing number of portable devices powered by battery; more and more research is focused on low-power design technique. For this thesis, a microcontroller (Texas Instruments MSP432) was used along with a digital sensor (Bosch BME280) to provide temperature, pressure and humidity information, and Wi-Fi module …

Microwave Acoustic Saw Resonators For Stable High-Temperature Harsh-Environment Static And Dynamic Strain Sensing Applications, Anin K. Maskay

Electronic Theses and Dissertations

High-temperature, harsh-environment static and dynamic strain sensors are needed for industrial process monitoring and control, fault detection, structural health monitoring in power plant environments, steel and refractory material manufacturing, aerospace, and defense applications. Sensor operation in the aforementioned extreme environments require robust devices capable of sustaining the targeted high temperatures, while maintaining a stable sensor response. Current technologies face challenges regarding device or system size, complexity, operational temperature, or stability.

Surface acoustic wave (SAW) sensor technology using high temperature capable piezoelectric substrates and thin film technology has favorable properties such as robustness; miniature size; capability of mass production; reduced installation …

Dna Functionalized Nanoparticles In Nanobiosensor And Sensor Array Development For Molecular Diagnostics And In Vitro Identification Of Biomolecules, Mustafa Salih Hizir

Legacy Theses & Dissertations (2009 - 2024)

Nucleic acid technology along with vast variety of nanomaterials has demonstrated a great potential in many applications from biosensing studies to molecular diagnostics, from biomedical and bioanalytical research to environmental analysis. Especially short single stranded (ss) DNA molecules, called oligonucleotides, are extraordinary biopolymers featuring diverse functionality on the nanoparticles thanks to their high degree of programmability, target-specific binding or cleavage, molecular recognition ability, structure-switching capability, and unique interactions at the bio-nano interfaces. Among those, there have been many biosensing applications utilizing ss DNAs and numerous nanomaterials through various detection techniques such as fluorometric, colorimetric or electrochemical methods. Although many groundbreaking …

Sandia Senior Design Collaboration: Vacuum Sensor Design, James L. Valerio, Eric J. Black, Joseph P. Bednarz, David R. Warther

Williams Honors College, Honors Research Projects

Sandia National Laboratories has requested a fully mechanical device to close a circuit after launch has occurred and the device enters a vacuum. Intended for applications in rockets and missiles, the device must fit in a 36 degree wedge with a 6.8 inch radius that is 6 inches in height and be ready to bolt onto a rocket. The pressure switch must be prevented from actuating until a launch acceleration ranging from 20 to 27g is detected. The pressure switch must close the circuit after a pressure of 10^-1 Torr is reached and before a pressure of 10^{-6 …}

Soil Moisture Sensor, Jaclyn Miller, Derek Bitecofer, Seung Jun Lee

Williams Honors College, Honors Research Projects

Since water is an important resource and not all communities around the world can afford to be liberal with their water needs; it has become important to use available water as efficiently as possible, especially in agriculture. For the purpose of reducing the overwatering of crops, an unattended ground moisture sensor can be implemented to measure the moisture level in the soil surrounding the plants. This will allow a farmer to know when to water or stop watering crops. For convenience, the moisture data information should be transmitted wirelessly to the user. The design of an unattended ground moisture sensor …