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oxygen detection based on Faraday modulation spectroscopy and wavelength modulation spectroscopy: A comparison

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2023年第5期65卷 1353-1358页

作者： He, Qixin Chang, Jvqiang Li, Mengxin Li, Jiakun Feng, Qibo Beijing Jiaotong Univ MoE Key Lab Luminescence & Opt Informat 3 Shangyuancun Beijing 100044 Peoples R China

An oxygen sensor system was developed based on Faraday modulation spectroscopy (FAMOS). In the system, a distributed feedback laser near 760.9 nm was used as the light source and a 30-cm long gas cell was employed for gas absorption. The first harmonic was extracted by a commercial lock in amplifier for the derivation of concentration. oxygen measurement experiments were conducted the performance of the sensor system was obtained. In addition, oxygen sensor system with wavelength modulation spectroscopy (WMS) scheme was developed with the same light source and gas cell for a direct comparison. Based on Allan deviation analysis, a detection limit of 0.186% for the WMS scheme and a detection limit of 0.108% for the FAMOS scheme were acquired at an averaging time of 1 s. The precisions can be further improved to 0.032% and 0.03% at an averaging time of 15 s, respectively.

关键词： absorption spectroscopy FAMOS oxygen detection WMS

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oxygen detection system based on TDLAS-WMS and a compact multipass gas cell

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2023年第5期65卷 1141-1145页

作者： Chang, Jvqiang He, Qixin Li, Jiakun Feng, Qibo Beijing Jiaotong Univ MoE Key Lab Luminescence & Opt Informat 3 Shangyuancun Beijing 100044 Peoples R China

In this paper, a sensitive oxygen monitoring system was demonstrated using tunable diode laser absorption spectroscopy and wavelength modulation spectroscopy. Light from a distributed feedback laser near 760.8 nm was coupled into a compact Herriott cell with a 3.3 m optical path. A LabVIEW-based orthogonal lock-in amplifier was developed to extract the gas concentration information from the absorption signal, which can achieve baseline fitting, background deduction, filtering, and harmonic extraction. oxygen measurement experiments were conducted, and the performance of the system was obtained. Based on an Allan deviation analysis, the minimum detection limit of the system was 0.247% at an averaging time of 1 s and could improve to 0.022% when the averaging time was 40 s.

关键词： oxygen detection TDLAS wavelength modulation spectroscopy

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Indium oxide thick-films decorated with PdO and PtO2 particles for oxygen detection in humid environments

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PHYSICA SCRIPTA 2024年第12期99卷 125028-125028页

作者： Sari, Wangi P. Rifai, Achmad P. Smith, Peter Agbroko, Samuel O. Covington, James Univ Gadjah Mada Dept Mech & Ind Engn Yogyakarta Indonesia McGowan Sensor Labs Ltd Abingdon OX14 3DB England Univ Warwick Sch Engn Coventry CV4 7AL England

Thick film indium oxide chemiresistive sensors decorated with PdO and PtO2 particles were investigated for oxygen detection under humid conditions (tested ranging from 20%-80% RH) across a temperature range of 50 degrees C to 400 degrees C. The PtO2-decorated In2O3 sensors demonstrated a significantly higher response to oxygen, showing a 500% increase at 200 degrees C compared to the PdO-decorated sensors (response values of 41 and 8, respectively). Tests in dry air were conducted to assess the effect of humidity on sensor performance, revealing a maximum response of 74 for PtO2-In2O3 at 400 degrees C, more than three times higher than the response of 22 for PdO-In2O3. Selectivity tests confirmed that the sensors responded more strongly to oxygen than to interfering gases. The integration of an active carbon cloth (ACC) filter effectively reduced interferences from isobutylene and ethylene, enhancing sensor's selectivity. A comparison of both sensors demonstrated that PtO2-decorated In2O3 has greater potential as an alternative to existing Pb-based electrochemical oxygen sensors, particularly in humid environments.

关键词： indium oxide oxygen detection chemiresistive sensor PdO PtO2 thick film ACC filter

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oxygen detection of Single Cells with Guided Movements 22

Oxygen Detection of Single Cells with Guided Movements

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22nd International Conference on Solid-State Sensors, Actuators and Microsystems, Transducers 2023

作者： Wang, Muting Pang, Stella W. City University Of Hong Kong Department Of Electrical Engineering Centre For Biosystems Neuroscience And Nanotechnology Hong Kong

ISBN: (纸本)9784886864352

Measurement of oxygen (O2) consumption is a critical parameter for understanding cell behaviors and viability in many biological systems. In this study, an O2 detection platform that comprises a luminescent dye-based optical O2 sensor and guiding structures was presented. This platform was employed to investigate the relationship between the O2 consumption of single cells and cell movements. Real-time observation of changes in O2 consumption was achieved as single cells were guided by patterned structures using the proposed O2 detection platform. The results demonstrate that changes in O2 consumption were associated with the area of mitochondria within the cell. Specifically, O2 consumption increased as the area occupied by mitochondria increased, as evidenced by an increase in the fluorescence intensity of the optical O2 sensor. These findings lay the foundation for studying cell activities and viability in tissue engineering. © 2023 IEEJ.

关键词： Guided Movements MC3T3-E1 Cell Optical oxygen Sensor oxygen detection

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oxygen detection with zinc oxide nanoparticle structures 5

Oxygen detection with zinc oxide nanoparticle structures

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5th South African Conference on Sensors, MEMS, and Electro-Optic Systems (SMEOS)

作者： Schwabe, Tobias Balke, Axel Bezuidenhout, Petrone H. Reker, Julia Meyer, Thorsten Joubert, Trudi-Heleen Hilleringmann, Ulrich Paderborn Univ Sensor Technol Dept D-33098 Paderborn Germany Univ Pretoria CEFIM ZA-0002 Pretoria South Africa CSIR Mat Sci & Mfg ZA-0184 Pretoria South Africa

ISBN: (纸本)9781510627536

Semiconductor metal oxide (SMO) sensors have been utilized as oxygen sensors in industry and research for decades. oxygen molecules adsorb to the SMO surface which leads to a measurable increase of resistivity [1]. Those sensors are valued for their high accuracy, but they operate at high temperatures [2]. Therefore, heating circuits inside the sensors are required, increasing size and power consumption of the sensors. This paper investigates the applicability of zinc oxide nanoparticle (ZnO) structures as low-cost oxygen detectors for measurements at room temperature. The main advantage of ZnO nanoparticle-based electronics is their low production cost since the nanoparticles can be deposited by cheap process techniques like spray-coating, spin-coating, inkjet-printing or the doctor blade process. Furthermore, they provide a high surface area to volume ratio which leads to higher sensitivity to oxygen. The most critical disadvantage is the high inhomogeneity of particle size and shape which causes nanoporous ZnO layers with low conductivity and nonuniform electrical characteristics. Therefore, gate structures were integrated into the sensors, so that the ZnO nanoparticle conductivity can be adjusted by applying a gate voltage. ZnO nanoparticle transistors with different electrode geometries and channel length were manufactured and analyzed. In different oxygen concentrations ZnO layer resistance, dependent on the applied gate voltage, was measured. Based on the results, a new layout for low-cost sensors without heating structures was developed. Since this work is part of a project, in which a low-cost water quality sensor is developed, the sensors are designed for oxygen concentration measurements in liquids as well.

关键词： ZnO Nanoparticle Thin-film transistor oxygen detection low-cost sensor

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oxygen detection system consisting of a millimeter wave Fabry-Perot resonator and an integrated SiGe front-end 9

Oxygen detection system consisting of a millimeter wave Fabr...

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Conference on Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications IX

作者： Wecker, Julia Bauch, Andreas Kurth, Steffen Mangalgiri, Gauri Gaitzsch, Markus Meinig, Marco Gessner, Thomas Nasr, Ismail Weigel, Robert Kissinger, Dietmar Hackner, Angelika Prechtel, Ulrich Fraunhofer Inst Elect Nano Syst ENAS Technol Campus 3 D-09126 Chemnitz Germany Tech Univ Chemnitz Ctr Microtechn Reichenhainer Str 70 D-09126 Chemnitz Germany Univ Erlangen Nurnberg Lehrstuhl Tech Elekt Cauerstr 9 D-91058 Erlangen Germany Airbus Grp Innovat Dept Sensors Elect & Syst Integrat TX4 Willy Messerschmitt Str 1 D-85521 Ottobrunn Germany

ISBN: (纸本)9781628419825

oxygen shows significant absorption lines in the millimeter wave spectrum. Resonators are widely used to achieve a strong absorption even with a short absorption paths length for concentration measurements. A sensor system based on a Fabry-Perot resonator for oxygen measurements at ambient pressure is presented here. The Fabry-Perot resonator consists of two metal mirrors with a diameter of 50 mm. For purpose of oxygen detection the resonator covers a frequency range between 55 GHz and 65 GHz with a resonant peak density between 1 GHz and 1.5 GHz, depending on the mirror distance, and a quality factor of approximately 7000. To achieve a compact sensor system the concept envisages two integrated transceiver circuits directly coupling to coaxial ports in the metal mirrors of the resonator. The integrated SiGe front-end addresses a frequency band from 50 GHz to 75 GHz. They are realized as heterodyne structures with integrated directional couplers, thus it is possible to measure scattering parameters. For first oxygen concentration measurements, the resonator sample was coupled to a commercially available Vector Network Analyzer. The cavity was filled with oxygen concentrations of 0% vol. and 20% vol. at ambient pressure and temperature resulting in a significant change of the quality factor for frequencies close to the oxygen absorption line at 60.6 GHz. The sensor does not contain hot components. This is an advantage compared to other oxygen sensors, like electrochemical or metal-oxide sensors.

关键词： Millimeter wave Fabry-Perot resonator integrated transceiver circuit oxygen detection

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Room Temperature Ionic Liquid Electrochemical Gas Sensor for Rapid oxygen detection with Transient Double Potential Amperometry 15

Room Temperature Ionic Liquid Electrochemical Gas Sensor for...

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15th IEEE Sensors Conference

作者： Wan, Hao Yin, Heyu Mason, Andrew J. Michigan State Univ Dept Elect & Comp Engn E Lansing MI 48824 USA

ISBN: (纸本)9781479982875

Gas monitoring is of great interest due to the critical role gases play in human health and the severe threats they can exhibit to occupational safety. Intense study has been conducted to implement gas sensors with high sensitivity, reliability and long lifetime. Room temperature ionic liquid (RTIL) based electrochemical sensors demonstrate many properties advantageous to these goals. This paper presents a microfabricated gas sensor with an RTIL electrolyte and gold electrode that was characterized for oxygen detection in air. In order to implement fast detection, a porous polytetrafluoroethylene substrate was utilized to increase gas permeability and decrease response time. Furthermore, a transient double potential amperometry (DPA) method was used for electrochemical analysis to greatly reduce measurement time and reverse reaction byproducts that could cause drift. Preliminary results indicate that the RTIL-based electrochemical gas sensor with transient DPA exhibits good sensitivity, linearity and reliability that is promising for practical real-world applications.

关键词： gas sensor double potential amperometry room temperature ionic liquid oxygen detection

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Polymer microparticles with ultralong room-temperature phosphorescence for visual and quantitative detection of oxygen through phosphorescence image and lifetime analysis

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CHINESE CHEMICAL LETTERS 2025年第5期36卷

作者： Chen, Zeyin Shi, Jiaju Zhou, Yusheng Zhang, Peng Liang, Guodong Sun Yat Sen Univ Sch Mat Sci & Engn PCFM Lab Guangzhou 510275 Peoples R China

Room-temperature phosphorescence (RTP) materials exhibiting long emission lifetimes have gained increasing attention owing to their potential applications in encryption, anti-counterfeiting, and sensing. However, most polymers exhibit a short RTP lifetime (<1 s) because of their unstable triplet excitons. Herein, a new strategy of polymer chain stabilized phosphorescence (PCSP), which yields a new kind of RTP polymers with an ultralong lifetime and a sensitive oxygen response, has been reported. The rigid polymer chains of poly(methyl mathacrylate) (PMMA) immobilize the emitter molecules through multiple interactions between them, giving rise to efficient RTP. Meanwhile, the loosely-packed amorphous polymer chains allow oxygen to diffuse inside, endowing the doped polymers with oxygen sensitivity. Flexible and transparent polymer films exhibited an impressive ultralong RTP lifetime of 2.57 s at room temperature in vacuum, which was among the best performance of PMMA. Intriguingly, their RTP was rapidly quenched in the presence of oxygen. Furthermore, RTP microparticles with a diameter of 1.63 mu m were synthesized using in situ dispersion polymerization technique. Finally, oxygen sensors for quick, visual, and quantitative oxygen detection were developed based on the RTP microparticles through phosphorescence lifetime and image analysis. With distinctive advantages such as an ultralong lifetime, oxygen sensitivity, ease of fabrication, and cost-effectiveness, PCSP opens a new avenue to sensitive materials for oxygen detection. (c) 2025 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.

关键词： Room-temperature phosphorescence (RTP) Flexible polymer Ultralong lifetimes Doping oxygen detection

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Optical-memory switching and oxygen detection based on the CVT grown γ- and α-phase In₂Se₃

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SENSORS AND ACTUATORS B-CHEMICAL 2015年 209卷 811-819页

作者： Ho, Ching-Hwa Lin, Min-Han Pan, Chia-Chi Natl Taiwan Univ Sci & Technol Grad Inst Appl Sci & Technol Taipei 106 Taiwan Natl Taiwan Univ Sci & Technol Dept Elect & Comp Sci Grad Inst Elect Optic Engn Taipei 106 Taiwan

Layered-type alpha- and gamma-In2Se3 crystals were simultaneously grown by chemical vapor transport (CVT) method using ICl3 as the transport agent. The crystalline state, surface state, and structural polytype of the as-grown In2Se3 were observed by high-resolution transmission electron microscopy (HRTEM). The direct band edges of alpha- and gamma-In2Se3 were evaluated by thermoreflectance (TR) measurements. For alpha-In2Se3, a surface oxidation layer alpha-In2Se3-3xO3x (0 <= x <= 1) can easily form on the crystal face in environmental air by oxygen detection (similar to 250 nm/day). The surface formation oxide can be easily removed by laser treatment (lambda = 266 nm, P = 60 mW) and the oxygen detection can be repeated again. For gamma-In2Se3,the HRTEM and Raman measurements reveal amorphous and polycrystalline state existing in the as-grown crystals. The amorphous effect renders erasable optical-memory switching of gamma <--> alpha inter-phase transition occurred inside the gamma-In2Se3 layer with laser heating treatment. The phase transition of In2Se3 is fast and easily by using the laser treatment. The phase transformation of gamma <-->alpha was verified by Raman and TR measurements. The optical-memory switching and oxygen detection behavior for the as-grown gamma- and alpha-phase In2Se3 are demonstrated herein. (C) 2014 Elsevier B.V. All rights reserved.

关键词： In2Se3 Structural-phase transition Optical memory oxygen detection Optoelectronic property

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ROOM TEMPERATURE IONIC LIQUID ELECTROCHEMICAL GAS SENSOR FOR RAPID oxygen detection WITH TRANSIENT DOUBLE POTENTIAL AMPEROMETRY

ROOM TEMPERATURE IONIC LIQUID ELECTROCHEMICAL GAS SENSOR FOR...

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IEEE Sensors

作者： Hao Wan Heyu Yin Andrew J. Mason Department of Electrical and Computer Engineering Michigan State University East Lansing MI USA

关键词： oxygen detection gas sensor double potential amperometry room temperature ionic liquid

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