Three-gas detection system with IR optical sensor based on NDIR technology

Tan, Qiulin; Tang, Licheng; Yang, Ming; Chen, Xue; Zhang, Wendong; Liu, Jun; Xiong, Jijun

doi:10.1016/j.optlaseng.2015.05.007

Cited by 93 publications

(50 citation statements)

References 23 publications

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“…An array of thermopile sensors can be used to detect multiple gases (e.g. three on a 2×2 array, with one reference channel) [22]. CO2 sensors based on the principle of radiometric thermal conductivity offer lower power consummation than traditional NDIR systems, however at the expense of resolution and complexity.…”

Section: Ndir Sensorsmentioning

confidence: 99%

A low cost MEMS based NDIR system for the monitoring of carbon dioxide in breath analysis at ppm levels

Vincent

Gardner

2016

Sensors and Actuators B: Chemical

138

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Please cite this article as: T.A.Vincent, J.W.Gardner, A low cost MEMS based NDIR system for the monitoring of carbon dioxide in breath analysis at ppm levels, Sensors and Actuators B: Chemical http://dx.doi.org/10. 1016/j.snb.2016.04.016 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.A low cost MEMS based NDIR system for the monitoring of carbon dioxide in breath analysis at ppm levels Highlights  MEMS based NDIR system for ppm CO2 detection with lock-in amplifier.  Fast 1.3 s response time for breath-by-breath analysis.  Portable breath analyser designed for measuring metabolic rate of subjects.  Effect of path length on NDIR system investigated with novel sensor housing.  Silicon on insulator IR emitter used for low power, low cost gas detection. AbstractThe molecules in our breath can provide a wealth of information about the health and well-being of a person. The level of carbon dioxide (CO2) is not only a sign of life but also when combined with the level of exhaled oxygen provides valuable health information in the form of our metabolic rate. We report upon the development of a MEMS-based non-dispersive infrared CO2 sensor for inclusion in a hand held portable breath analyser. Our novel sensor system comprises a thermopile detector and low power MEMS silicon on insulator (SOI) wideband infrared (IR) emitter. A lock-in amplifier design permits a CO2 concentration of 50 ppm to be detected on gas bench rig. Different IR path lengths were studied with gases in dry and humid (25 % and 50 % RH) in order to design a sensor suitable for detecting CO2 in breath with concentrations in the range of 4 to 5 %. A breath analyser was constructed from acetal and in part 3D printed with a side-stream sampling mechanism and tested on a range of subjects with two data-sets presented here. The performance of the novel MEMS based sensor was validated using a reference commercial breath-by-breath sensor and produced comparable results and gave a response time of 1.3 s. Further work involves the detection of other compounds on breath for further metabolic analysis and reducing the overall resolution of our MEMS sensor system from ca. 250 ppm to 10 ppm.

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Section: Ndir Sensorsmentioning

confidence: 99%

A low cost MEMS based NDIR system for the monitoring of carbon dioxide in breath analysis at ppm levels

Vincent

Gardner

2016

Sensors and Actuators B: Chemical

138

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“…At present, the methods for monitoring methane concentration are based on various detection methods, including electrochemical [7], gas chromatography [8], thermal conductivity [9], catalytic combustion [10,11], photoionisation [12] and non-dispersive infrared (NDIR) [13][14][15]. Among these methods, NDIR gas sensors have advantages such as simple operation and maintenance, a long service life, fast response time, high measurement accuracy and fail-to-safe operation.…”

Section: Introductionmentioning

confidence: 99%

Optimised Performance of Non-Dispersive Infrared Gas Sensors Using Multilayer Thin Film Bandpass Filters

Wang

Gibson

et al. 2018

Coatings

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In this work, performance improvements are described for a low-power consumption non-dispersive infrared (NDIR) methane (CH4) gas sensor using customised optical thin film bandpass filters (BPFs) centered at 3300 nm. BPFs shape the spectral characteristics of the combined mid-infrared III–V based light emitting diode (LED)/photodiode (PD) light source/detector optopair, enhancing the NDIR CH4 sensor performance. The BPFs, deposited using a novel microwave plasma-assisted pulsed DC sputter deposition process, provide room temperature deposition directly onto the temperature-sensitive PD heterostructure. BPFs comprise germanium (Ge) and niobium pentoxide (Nb2O5) alternating high and low refractive index layers, respectively. Two different optical filter designs are progressed with BPF bandwidths (BWs) of 160 and 300 nm. A comparison of the modelled and measured NDIR sensor performance is described, highlighting the maximised signal-to-noise ratio (SNR) and the minimised cross-talk performance benefits. The BPF spectral stability for various environmental temperature and humidity conditions is demonstrated.

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“…Mukherjee [ 19 ] designed a non-dispersive optical multiplexer using a scanning galvanometer for multispecies trace-gas detection, where five quantum cascade lasers (QCLs) were used, using time division multiplexing (TDM). Tan [ 20 ] integrated four single-channel pyroelectric sensors in a miniature optical gas chamber based on a non-dispersive infrared (NDIR) technique. Mao [ 21 ] reported an all-optical photoacoustic spectrometer for multi-gas analysis based on a tunable erbium-doped fiber laser and a fiber acoustic sensor.…”

Section: Introductionmentioning

confidence: 99%

Development and Measurements of a Mid-Infrared Multi-Gas Sensor System for CO, CO2 and CH4 Detection

Dong

Zheng

Miao

et al. 2017

Sensors

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A multi-gas sensor system was developed that uses a single broadband light source and multiple carbon monoxide (CO), carbon dioxide (CO2) and methane (CH4) pyroelectric detectors by use of the time division multiplexing (TDM) technique. A stepper motor-based rotating system and a single-reflection spherical optical mirror were designed and adopted to realize and enhance multi-gas detection. Detailed measurements under static detection mode (without rotation) and dynamic mode (with rotation) were performed to study the performance of the sensor system for the three gas species. Effects of the motor rotating period on sensor performances were also investigated and a rotation speed of 0.4π rad/s was required to obtain a stable sensing performance, corresponding to a detection period of ~10 s to realize one round of detection. Based on an Allan deviation analysis, the 1σ detection limits under static operation are 2.96, 4.54 and 2.84 parts per million in volume (ppmv) for CO, CO2 and CH4, respectively and the 1σ detection limits under dynamic operations are 8.83, 8.69 and 10.29 ppmv for the three gas species, respectively. The reported sensor has potential applications in various fields requiring CO, CO2 and CH4 detection such as in coal mines.

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Three-gas detection system with IR optical sensor based on NDIR technology

Cited by 93 publications

References 23 publications

A low cost MEMS based NDIR system for the monitoring of carbon dioxide in breath analysis at ppm levels

A low cost MEMS based NDIR system for the monitoring of carbon dioxide in breath analysis at ppm levels

Optimised Performance of Non-Dispersive Infrared Gas Sensors Using Multilayer Thin Film Bandpass Filters

Development and Measurements of a Mid-Infrared Multi-Gas Sensor System for CO, CO2 and CH4 Detection

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