Long-distance in-situ methane detection using near-infrared light-induced thermo-elastic spectroscopy

Hu, Lien; Zheng, Cheng; Zhang, Minghui; Zheng, Kaiyuan; Jiao, Z.; Zhan-wei, Song; Li, Xiuying; Wang, Yiding; Tittel, Frank K.

doi:10.1016/j.pacs.2020.100230

Cited by 38 publications

(13 citation statements)

References 25 publications

(20 reference statements)

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“…The optimal position of QTF was experimentally chosen by observation of the 2f signal amplitude registered for a 2000 ppmv (parts per million by volume) mixture of CH 4 and nitrogen (N 2 ), with special attention paid to both the signal amplitude and the signal oscillations that occur with suboptimal QTF settings (optical fringe caused by back-reflections from the silver layer on the QTF). Changing the illumination position can to some extent affect the level of thermal noise generated by the quartz resonator [ 41 , 42 ]. In the case of the presented system, the maximum signal-to-noise ratio occurred at a point of maximum 2f signal amplitude.…”

Section: Methodsmentioning

confidence: 99%

Quartz-Enhanced Photothermal Spectroscopy-Based Methane Detection in an Anti-Resonant Hollow-Core Fiber

Bojęś

Pokryszka

Jaworski

et al. 2022

Sensors

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In this paper, the combination of using an anti-resonant hollow-core fiber (ARHCF), working as a gas absorption cell, and an inexpensive, commercially available watch quartz tuning fork (QTF), acting as a detector in the quartz-enhanced photothermal spectroscopy (QEPTS) sensor configuration is demonstrated. The proof-of-concept experiment involved the detection of methane (CH4) at 1651 nm (6057 cm−1). The advantage of the high QTF Q-factor combined with a specially designed low-noise amplifier and additional wavelength modulation spectroscopy with the second harmonic (2f-WMS) method of signal analysis, resulted in achieving a normalized noise-equivalent absorption (NNEA) at the level of 1.34 × 10−10 and 2.04 × 10−11 W cm−1 Hz−1/2 for 1 and 100 s of integration time, respectively. Results obtained in that relatively non-complex sensor setup show great potential for further development of cost-optimized and miniaturized gas detectors, taking advantage of the combination of ARHCF-based absorption cells and QTF-aided spectroscopic signal retrieval methods.

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Section: Methodsmentioning

confidence: 99%

Quartz-Enhanced Photothermal Spectroscopy-Based Methane Detection in an Anti-Resonant Hollow-Core Fiber

Bojęś

Pokryszka

Jaworski

et al. 2022

Sensors

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“…LITES technology overcomes the above limitation well. The detection module can be placed far away from the environment to be tested, so that QTF will not be affected [23][24][25][26][27] . In LITES, after being absorbed by target gas, the laser is irradiated on the crystal surface of QTF.…”

Section: Introductionmentioning

confidence: 99%

Sensitive carbon monoxide detection based on light-induced thermoelastic spectroscopy with a fiber-coupled multipass cell [Invited]

Liu

2022

Chin. Opt. Lett.

116

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A sensor based on light-induced thermoelastic spectroscopy (LITES) with a fiber-coupled multipass cell was demonstrated for carbon monoxide (CO) detection. The fiber-coupled structure has the merits of reducing optical interference and difficulty in optical alignment and increasing system robustness. A 1.57 μm continuous wave distributed feedback diode laser was used as the excitation source. A minimum detection limit of 9 ppm was obtained, and the calculated normalized noise equivalent absorption coefficient was 1.15 × 10 −7 cm −1 • W • Hz −1=2 . The reported CO-LITES sensor showed excellent linear concentration response and system stability.

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“…After absorbed by target gas, the modulated beam laser hits the QTF surface generating a modulated localized heating. The temperature changes in QTF induced by photothermal conversion results in thermoelastic expansion and contraction [24] , [25] , [26] , [27] , [28] . These light-induced deformations, once again, generate a charge distribution that can be collected by the metal pattern, generating an electrical signal which results proportional to the portion of absorbed light from the gas sample.…”

Section: Introductionmentioning

confidence: 99%

Quartz tuning forks resonance frequency matching for laser spectroscopy sensing

Qiao

et al. 2022

Photoacoustics

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In this paper, we report on the performance of quartz tuning fork (QTF) based laser spectroscopy sensing employing multiple QTFs. To avoid that resonance frequency mismatching of the QTFs degrades the sensor performance, two types of resonance frequency matching method are here proposed. A system based on the coupling of two sensing modules, one based on quartz-enhanced photoacoustic spectroscopy (QEPAS) and one on light-induced thermoelastic spectroscopy (LITES) technique, was realized to validate the proposed methods. Each module employed a different QTF (QTF1 and QTF2, respectively). Operating temperature or pressure of QTF2 were regulated to match the resonance frequency of QTF1, which operated at 25.0 °C and atmospheric pressure. Without regulation, the difference between QTF1 and QTF2 resonance frequencies was 2.42 Hz and the superposition coefficient η was only 54.7%. When the temperature regulation was carried out, at a QTF2 operating temperature of 67.5 °C, an optimal η value of 95.0% was obtained. For the pressure regulation approach, if operating QTF2 at pressure of 500 Torr, η reached a value of 97.2%. The obtained results show that the proposed two methods are effective in resonance frequency matching of QTFs for gas sensing systems.

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Long-distance in-situ methane detection using near-infrared light-induced thermo-elastic spectroscopy

Cited by 38 publications

References 25 publications

Quartz-Enhanced Photothermal Spectroscopy-Based Methane Detection in an Anti-Resonant Hollow-Core Fiber

Quartz-Enhanced Photothermal Spectroscopy-Based Methane Detection in an Anti-Resonant Hollow-Core Fiber

Sensitive carbon monoxide detection based on light-induced thermoelastic spectroscopy with a fiber-coupled multipass cell [Invited]

Quartz tuning forks resonance frequency matching for laser spectroscopy sensing

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