Design of NO<sub>2</sub> photoacoustic sensor with high reflective mirror based on low power blue diode laser

Design of NO₂ photoacoustic sensor with high reflective mirror based on low power blue diode laser

Jin Hua-Wei^{1, 2, 6}, Xie Pin-Hua^{1, 3, 4, 5, †}, Hu Ren-Zhi^{1, 2, ‡}, Huang Chong-Chong^{1, 2}, Lin Chuan¹, Wang Feng-Yang^{1, 2}

(a) Relationship between photoacoustic response, resonance frequency, and temperature. Photoacoustic response should increase with temperature rising, and the resonance frequency tends to drift with temperature rising. (b) Relationship between photoacoustic response, resonance frequency, and humidity. Photoacoustic response increases with humidity increasing, and humidity has no effect on resonant frequency.