Acta Photonica Sinica, Volume. 50, Issue 10, 1030002(2021)
Highly Sensitive Carbon Monoxide Gas Sensors Based on a Difference Photoacoustic Cell(Invited)
A photoacoustic carbon monoxide gas sensor with high sensitivity was demonstrated. A near-infrared distributed feedback laser laser with a wavelength of 1 566.3 nm was used as the excitation source. A commercial fiber amplifier was employed to pump the laser power to 10 W level, which solved the problem of low detection sensitivity due to the weak absorption in the near-infrared wavelength region. A dual channel differential photoacoustic cell with the same structure was designed to reduce the window noise caused by high power laser. By optimizing the excitation light power and working pressure of the sensor system, a signal amplitude of 1.38 mV, a noise (1σ) of 0.96 μV, a detection signal to noise ratio of 1 437.5, the detection sensitivity of 34 ppb, and a normalized noise equivalent coefficient of 1.74×10-8 cm-1W/Hz1/2 were obtained.
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Xukun YIN, Miao GAO, Ruiqi MIAO, Yongliang SU, Xueshi ZHANG, Le ZHANG, Lixian LIU, Xiaopeng SHAO. Highly Sensitive Carbon Monoxide Gas Sensors Based on a Difference Photoacoustic Cell(Invited)[J]. Acta Photonica Sinica, 2021, 50(10): 1030002
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Received: Jun. 1, 2021
Accepted: Jul. 13, 2021
Published Online: Nov. 3, 2021
The Author Email: SHAO Xiaopeng (xpshao@xidian.edu.cn)