Ppb-level nitric oxide photoacoustic sensor based on a mid-IR quantum cascade laser operating at 52 °C

SENSORS AND ACTUATORS B-CHEMICAL

卷:290

Article

Wu, Hongpeng^1,2  Yin, Xukun^1,2,5  Dong, Lei^1,2  Jia, Zhiwei^3,4  Zhang, Jinchuan⁴  Liu, Fengqi⁴  Ma, Weiguang^1,2  Zhang, Lei^1,2  Yin, Wangbao^1,2  Xiao, Liantuan^1,2  Jia, Suotang^1,2  Tittel, Frank K.⁵ 

[1] Shanxi Univ, Inst Laser Spect, State Key Lab Quantum Opt & Quantum Opt Devices, Taiyuan 030006, Shanxi, Peoples R China

[2] Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Shanxi, Peoples R China

[3] Taiyuan Univ Technol, Coll Phys & Optoelect, Taiyuan 030024, Shanxi, Peoples R China

[4] Chinese Acad Sci, Inst Semicond, Key Lab Semicond Mat Sci, Beijing 100083, Peoples R China

[5] Rice Univ, Dept Elect & Comp Engn, 6100 Main St, Houston, TX 77005 USA

关键词: Nitric oxide detection;    Photoacoustic spectroscopy;    High temperature continuous-wave DFB-QCL;    Outdoor environmental monitoring;   

DOI  :  10.1016/j.snb.2019.04.007

来源: Elsevier

【 摘 要 】

A ppb-level nitric oxide (NO) photoacoustic sensor was reported for outdoor environmental monitoring. The sensor employed a continuous wave (CW), distributed feedback (DFB), mid-infrared (mid-IR) quantum cascade laser (QCL) operating at a high temperature of 52 degrees C, which allow avoiding any water-cooling systems and thereby reduces its size, weight and cost of the photoacoustic NO sensor. The QCL emits at 5.26 mu m, which corresponds to a strong NO absorption doublet R(6.5). A differential photoacoustic cell was designed to operate together with the QCL, resulting in a detection sensitivity of (similar to)7 ppb at atmospheric pressure with a 1-s averaging time. An Allan-Werle deviation analysis indicated that a ppt-level detection sensitivity can be reached with an integration time of > 100 s. The performance of this sensor system was evaluated in terms of humidity, linearity and stability. Continuous measurements covering a haze period were performed to demonstrate the stability and robustness of the reported NO sensor system.

【 授权许可】

Free