Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 62 for “"gas sensor"”.
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Photoacoustic photonic crystal fiber gas sensor
… that has demonstrated very high sensitivity for gas detection. Typically, PAS involves the absorption of a modulated laser beam by the gas species of interest, and the subsequent generation of acoustic waves at the modulation frequency. The amplitude of the acoustic signal, which can be measured …
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Extrinsic Fabry-Perot Interferometric hydrogen gas sensor
The detection and active monitoring of hydrogen gas levels is essential in many areas of industry including manufacturing, storage, and transport of this gas. Previously, methods used to detect hydrogen gas have relied upon monolithic technologies to create resistive-based sensors which are …
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Printable and Machine Intelligent 0D/2D Materials Gas Sensor Arrays
A smart gas sensor array (GSA) powered by machine intelligence is a machine-equivalent olfactory system of mammalian nose. Such systems’ ability to distinguish different species of gases and quantitatively measure trace-level gas concentrations is crucial for pollution monitoring, hazard gas …
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Long period fibre grating as gas sensor for environmental pollution monitoring.
… the existence and concentration of a given gas in the region immediately surrounding the fibre cladding. The principle and the viability of using LPGs for sensor applications is supported by the preliminary results reported here. However, the sensitivity of the sensor requires further …
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A Gas Sensor for the Selective Detection of Volatile Organic Compounds
… Standard measurement techniques, such as Gas Chromatography (GC), are typically sensitive and selective, but are limited by their large size, high cost and complexity to operate. Such factors restrict deployment for practical applications, including measurement across air quality networks. …
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Fabrication and Characterization of a Porous Clad Optical Fiber Gas Sensor
… been developed that can be used as a chemical gas sensor. Fabrication of the optical fiber produces a fiber that has a solid core with a porous cladding. The porous cladding region is made from a spinodally phase separable glass where the secondary phase is removed through dilute acid leaching. …
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Modeling and Spray Pyrolysis Processing of Mixed Metal Oxide Nano-Composite Gas Sensor Films
The role of sensor technology is obvious in improvement and optimization of many industrial processes. The sensor films, which are considered the core of chemical sensors, have the capability to detect the presence and concentration of a specific chemical substance. Such sensor films achieve …
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Optimization of titanium dioxide (TiO2) thin film using dip coating technique for oxygen gas sensor
Titanium dioxide (TiO2) thin film gas sensors have been widely used and investigated in the detection of target gases. However, to obtain anatase phase for oxygen gas sensor with low and short annealing temperature is the obstacle in the fabrication of oxygen gas sensor. It is thus desirable to …
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Fluorinated Graphene Oxide Based Chemiresistive Gas Sensor Targeting NH3 and Other Analytes Under Atmospheric Conditions
… and implemented using these materials in sensor fabrication for the detection of chemical analytes such as volatile organic compounds (VOC). The detection methods rely on using functionalization of modified graphene derivatives to target select analytes and produce a quantifiable, …
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Sensitivity, selectivity, and stability of a palladium-loaded single-walled carbon nanotube methane gas sensor
There exists a need to detect methane (CH₄) gas, and optical sensors provide many advantages over electronic sensors. Single-walled carbon nanotubes (SWNT) can be used as optical sensors, as SWNTs emit fluorescence upon photoexcitation. The photoluminescent (PL) intensity upon excitation depends on …
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Plasma modification of metal oxides and textiles: tailoring surface properties for improved gas sensor and protective clothing applications
… to modify various materials for applications in gas sensing and protective clothing. By relating changes in the plasma gas-phase during treatment, resulting material characteristics, and application-based performance, insights into how these materials work can be gained. Ultimately, this …
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Terahertz wave-molecule interactions via CMOS chips : from comb gas sensor with absolute specificity to ultra-stable, miniaturized clock
… the millimeter wave and terahertz regimes, polar gaseous molecules generate unique rotational spectra. The frequency and absorption intensity of rotational spectral lines are directly linked to the micro-scale molecular structures. They serve as an indicator or "finger-print" of molecules. Thus, a …
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Synthesis and Fabrication of Alpha Phase Iron Oxide (α-Fe2O3) Nanostructured doped with Ruthenium for Highly Sensitive and Selective Flammable and Toxic Gas Sensor
… causes the release of flammable and hazardous gases, which affect human health, into the atmosphere. Many research efforts have been focused on detecting and monitoring these gases using metal oxide semiconductor materials. This study investigates the gas sensing performance of ruthenium-doped …
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A Miniaturized Chemical Vapor Detector Using MEMS Flexible Platform
… tools such as miniaturized and sensitive gas sensor. This can detect the released volatiles in addition to be implementable in portable electronics, which decisively improves the patient’s survival rate. Therefore, in this thesis and in an effort to develop high-sensitive and miniaturized …
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The properties of sputtered copper oxide thin film for sensing application
Gas sensor is an important functional device that will guarantee the safety of human from being exposed to hazardous gases. The important features of a gas sensor are the ability to response towards the gas at the shortest time, the sensitivity towards the specific gas and the portability of gas …
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Synthesis, Fabrication and Surface Modification of Nanocrystalline Nickel Oxide for Electronic Gas Sensors
Recently, metal oxide gas sensors have attracted much attention in connection with monitoring of combustible and toxic gases because of their higher sensitivity, fast response and recovery times, low power consumption, and low fabrication cost. Nickel oxide (NiO) is a wide band gap and p-type …
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Nanoparticle and Sol -Gel Inks for Direct -Write Assembly of Functional Metallic and Metal Oxide Materials
… enabling a systematic study of microwire TiO2 gas sensors. A model gas sensor consisting of a single layer of parallel microwires is printed with the TiO2-based sol-gel ink in a well-defined, programmable pattern. The as-printed structure is heat treated in air to 600°C to form anatase …
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In-Situ Spectrocopy: Gas Mixture Analysis Using A Simplified Multi-Pass Capillary Cell and Optical Considerations In Dual-Pulse Laser-Induced Breakdown Spectroscopy Analysis of Bulk Aqueous Solutions
… two methods described herein will be an in-situ gas sensor using Raman Spectroscopy and considerations for a laser-induced breakdown spectroscopic method geared towards in-situ analysis of hydrothermal vents. </p> <p> Chapter 1 will describe a novel, yet simple gas sensor that utilizes a …
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Palladium (pd) decorated zinc oxide (ZnO) nanoparticles for gas sensing applications: meat spoilage gases
… method for the purpose of testing their gas sensing properties. After the synthesis of these nanoparticles, various characterization techniques for the investigation of both physical and chemical properties were employed. Different percentages of Palladium ranging between 0.2% and 0.7% …
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