首页|Highly sensitive CO2-LITES sensor based on a self-designed low-frequency quartz tuning fork and fiber-coupled MPC
Highly sensitive CO2-LITES sensor based on a self-designed low-frequency quartz tuning fork and fiber-coupled MPC
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A highly sensitive carbon dioxide[CO2]sensor based on light-induced thermoelastic spectroscopy[LITES]utilizing a self-designed low-frequency quartz tuning fork[QTF]and a fiber-coupled multipass cell[MPC]is reported in this paper.The QTF with a low resonant frequency of 8675 Hz and a high Q factor of 11,675.64 was used to improve its energy accumulation time and the sensor's signal level.The MPC with the fiber-coupled structure and optical length of 40 m was adopted to signifi-cantly increase the gas absorbance and reduce the optical alignment difficulty as well as improve the robustness of the sensor system.A distributed feedback[DFB],near-infrared diode laser with an emission wavelength of 1.57 μm was used as an excitation source.The experimental results showed that this CO2-LITES sensor had an excellent linear response to CO2 concentrations.The minimum detection limitation[MDL]of this CO2-LITES sensor was obtained to be 445.91 ppm,and it could be improved to 47.70 ppm[parts per million]when the integration time of the system reached 500 s.Further improvement methods for the detection performance of such sensors were also discussed.
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