Hollow Waveguide-Enhanced Mid-Infrared Sensor for Real-Time Exhaled Methane Detection

Liu, Lin; Xiong, Bo; Yan, Yuying; Li, Jinyi; Du, Zhenhui

doi:10.1109/lpt.2016.2559528

Cited by 26 publications

(38 citation statements)

References 18 publications

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“…The requirements of compactness, small sample volume, and fast response time stimulated the development of a new type of gas cell. Recently, a hollow waveguide (HWG)-based gas cell has been found to boast the advantages of small sample volume and fast response time [8,32], whereas substrate-integrated hollow waveguides (iHWG) are compact integrated sensors [33]. On the other hand, the need for non-fixed open-path gas detection, e.g., leak detection, aroused the development of standoff remote sensing without a retroreflector [34][35][36].…”

Section: System Configurationmentioning

confidence: 99%

“…Laser-based trace gas sensing is becoming more popular in a wide variety of areas including urban and industrial emission measurement [1,2], environmental and pollution monitoring [3,4], chemical analysis and industrial process control [5,6], medical diagnostics [7,8], homeland security [9], and scientific research [10,11]. With the increase in global environmental, ecological, and energy issues, laser-based trace gas detection technology has attracted unprecedented attention.…”

Section: Introductionmentioning

confidence: 99%

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Mid-Infrared Tunable Laser-Based Broadband Fingerprint Absorption Spectroscopy for Trace Gas Sensing: A Review

Zhang

et al. 2019

Applied Sciences

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130

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The vast majority of gaseous chemical substances exhibit fundamental rovibrational absorption bands in the mid-infrared spectral region (2.5–25 μm), and the absorption of light by these fundamental bands provides a nearly universal means for their detection. A main feature of optical techniques is the non-intrusive in situ detection of trace gases. We reviewed primarily mid-infrared tunable laser-based broadband absorption spectroscopy for trace gas detection, focusing on 2008–2018. The scope of this paper is to discuss recent developments of system configuration, tunable lasers, detectors, broadband spectroscopic techniques, and their applications for sensitive, selective, and quantitative trace gas detection.

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Section: System Configurationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mid-Infrared Tunable Laser-Based Broadband Fingerprint Absorption Spectroscopy for Trace Gas Sensing: A Review

Zhang

et al. 2019

Applied Sciences

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130

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“…Most of the currently available remote sensors are based on optical detection that utilizes measurements of light absorption to determine the chemical composition of the sample. Tunable laser absorption spectroscopy (TLAS) has been demonstrated to have high sensitivity and good selectivity for real-time, in situ trace gas sensing [2,3]. And the development of a commercial room-temperature MIR laser has significantly boosted the sensitivity of a trace amount of gas detection.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear gas sensing based on third-harmonic generation in cascaded chalcogenide microfibers

Huang

Zeng

et al. 2019

J. Opt. Soc. Am. B

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The performance of conventional gas sensors based on light absorption in the mid-infrared (MIR) faces the challenges of the high cost and low efficiency of photodetection at these wavelengths. In this paper, a nonlinear gas sensor based on third-harmonic generation (THG) in cascaded chalcogenide microfibers is proposed. In the first microfiber section, the input MIR light with "fingerprint" frequency has shown the ability for a large amount of gas absorption. The second microfiber section is used for THG pumped by the residual MIR light. In this process, the sensing signal is converted to the near-infrared region, and the power variation caused by the absorption is amplified due to the nonlinear relation between pump and harmonic signals. According to our analysis, the lowest methane concentration of 7.4 × 10 −8 can be detected at a practically drawable Ae 2 Se 3 microfiber length of 1 cm. Compared to direct MIR gas sensing, cascaded microfiber sensing has the advantages of improved sensing performance and also shorter absorption length.

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“…The detection principle of gas sensitive methane sensor is that the resistivity of metal oxide changes significantly when the metal oxide is adsorbed on different gases [6][7][8]. The principle of infrared methane sensor is that different gases have different absorption spectra of infrared radiation, and the intensity of absorption is related to the methane concentration [9][10][11]. However, these methane sensors do not measure methane concentration in large scale and require frequent calibration.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of an Effective Light Interference Methane Sensor Based on Three-Dimensional Optical Path Model

Long

Yang

et al. 2018

Journal of Sensors

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As an important environmental monitoring equipment, the existing methane sensors or the traditional interferometer-based methane detectors have some drawbacks, such as low accuracy, large size, and complex calibration operations. Moreover, the optical path model and analysis method for the light interference methane sensor are not practical. In this paper, an effective light interference methane sensor is proposed based on a three-dimensional optical path model with point light source. Based on this model, the interference optical system is studied to illustrate the cause of the interference fringes. Furthermore, the influencing factors of the light intensity distribution are analyzed and an adjustment method for the interference fringes is proposed, which helps to simplify the assembling and calibrating operations. In order to improve the measurement accuracy, a temperature drift compensation method which includes a mapping table, a steady-state compensator, and a dynamic compensator is proposed. The mapping table is established between the output voltages of photoelectric detector, and the methane concentration, the steady-state compensator, and the dynamic compensator are proposed to eliminate the temperature drift. Finally, an experimental device for the light interference methane sensor is constructed to validate the interference fringe adjustment method and the temperature drift compensation method.

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Hollow Waveguide-Enhanced Mid-Infrared Sensor for Real-Time Exhaled Methane Detection

Cited by 26 publications

References 18 publications

Mid-Infrared Tunable Laser-Based Broadband Fingerprint Absorption Spectroscopy for Trace Gas Sensing: A Review

Mid-Infrared Tunable Laser-Based Broadband Fingerprint Absorption Spectroscopy for Trace Gas Sensing: A Review

Nonlinear gas sensing based on third-harmonic generation in cascaded chalcogenide microfibers

Analysis and Design of an Effective Light Interference Methane Sensor Based on Three-Dimensional Optical Path Model

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