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

Fig. 1. Simulation of CO absorption spectra based on HITRAN 2012: (a) absorption line strength; (b) absorption coefficient of 50,000 ppm CO:N₂ at 296 K, 1 atm, and 40 m optical path length.

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Fig. 2. Schematic diagram of CO-LITES sensing system. MPC, multipass cell; QTF, quartz tuning fork; ∑, adder; PC, personal computer; FC, fiber collimator; DFB, distributed feedback.

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Fig. 3. Normalized and squared amplitude of QTF response as a function of frequency.

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Fig. 4. Normalized 2f signal amplitude of CO-LITES sensor as a function of laser wavelength modulation depth.

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Fig. 5. CO-LITES sensor 2f signal for different concentrations.

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Fig. 6. Linear relationship between the peak value of the 2f signal and CO concentration.

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Fig. 7. Allan deviation analysis of the CO-LITES sensor.

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Table 1. Performance Comparison of Two QTF-Based Methods for CO Detection
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Table 1. Performance Comparison of Two QTF-Based Methods for CO Detection
Method NNEA ( ${cm}^{- 1} \cdot W \cdot {Hz}^{- 1 / 2}$ )
QEPAS^[39] $1.45 \times 10^{- 5}$
This work $1.15 \times 10^{- 7}$

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Xiaonan Liu, Yufei Ma, "Sensitive carbon monoxide detection based on light-induced thermoelastic spectroscopy with a fiber-coupled multipass cell [Invited]," Chin. Opt. Lett. 20, 031201 (2022)

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