A Sensitive Carbon Dioxide Sensor Based on Photoacoustic Spectroscopy with a Fixed Wavelength Quantum Cascade Laser. - Shunda Qiao; Yanchen Qu; Yufei Ma 001; Ying He 015; Yao Wang; Yinqiu Hu; Xin Yu 006; Zhonghua Zhang; Frank K. Tittel (Sensors, 2019)