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Trace gas sensing based on multi-quartz-enhanced photothermal spectroscopy
Yufei Ma1, Yinqiu Hu1, Shunda Qiao1
1National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin, 150001, China.
Photoacoustics
|September 30, 2020
Summary
A novel multi-quartz-enhanced photothermal spectroscopy (M-QEPTS) method enhances trace gas detection. This technique uses two quartz tuning forks (QTFs) to significantly improve signal amplitude for detecting gases like acetylene.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Sensor Technology
Background:
- Traditional quartz-enhanced photothermal spectroscopy (QEPTS) uses a single quartz tuning fork (QTF) for photothermal detection.
- Limitations in signal amplitude can affect the sensitivity of QEPTS for trace gas detection.
Purpose of the Study:
- To introduce and validate a novel multi-quartz-enhanced photothermal spectroscopy (M-QEPTS) method for enhanced trace gas detection.
- To improve signal amplitude and limit of detection (LoD) compared to traditional QEPTS sensors.
Main Methods:
- Developed an M-QEPTS sensor utilizing two QTFs to sum piezoelectric signals, increasing amplitude.
- Removed QTF coating to enhance laser absorption and transmission.
- Employed wavelength modulation spectroscopy (WMS) with 2nd harmonic detection for acetylene (C2H2) concentration measurement.
Main Results:
- Achieved a limit of detection (LoD) of 0.97 ppm for acetylene with a 1-second integration time.
- Demonstrated a 1.51 times signal enhancement compared to a single-QTF QEPTS sensor.
- Obtained an optimized LoD of 0.19 ppm using Allan deviation analysis with a 200-second integration time.
Conclusions:
- The M-QEPTS method offers a significant advancement in trace gas detection sensitivity.
- The dual-QTF configuration effectively amplifies photothermal signals, improving detection limits.
- M-QEPTS shows great potential for sensitive and accurate analysis of trace gases.
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