Feng Chaofan, Shen Xiaowen, Li Biao, Liu Xiaoli, Jing Yujing, Huang Qi, Patimisco Pietro, Spagnolo Vincenzo, Dong Lei, Wu Hongpeng
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China.
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China.
Photoacoustics. 2024 Jan 18;36:100585. doi: 10.1016/j.pacs.2024.100585. eCollection 2024 Apr.
We report on a photoacoustic sensor system based on a differential photoacoustic cell to detect the concentration of CO impurities in hydrogen. A DFB-QCL laser with a central wavelength of 4.61 µm was employed as an exciting source with an optical power of 21 mW. Different concentrations of CO gas mixed with pure hydrogen were injected into the photoacoustic cell to test the linear response of the photoacoustic signal to the CO concentration. The stability of the long-term operation was verified by Allan-Werle deviation analysis. The minimum detection limit (MDL, SNR=1) results 8 ppb at 1 s and reaches a sub-ppb level at 100 s of integration time. Dynamic response of the system is linear and has been tested up to the concentration of 6 ppm. Saturation conditions are expected to be reached for CO concentration larger than 100 ppm.
我们报道了一种基于差分光声池的光声传感器系统，用于检测氢气中一氧化碳杂质的浓度。采用中心波长为4.61 µm的分布反馈量子级联激光器作为激发源，光功率为21 mW。将不同浓度的一氧化碳气体与纯氢气混合后注入光声池，以测试光声信号对一氧化碳浓度的线性响应。通过Allan-Werle偏差分析验证了长期运行的稳定性。最小检测限（MDL，SNR = 1）在1 s时为8 ppb，在100 s积分时间时达到亚ppb水平。该系统的动态响应呈线性，已在高达6 ppm的浓度下进行了测试。预计一氧化碳浓度大于100 ppm时会达到饱和条件。
