Integrated near-infrared fiber-optic photoacoustic sensing demodulator for ultra-high sensitivity gas detection

• Published in: Photoacoustics (Munich) Vol. 33; p. 100560
• Main Authors: Zhao, Xinyu, Li, Chenxi, Qi, Hongchao, Huang, Jiayu, Xu, Yufu, Wang, Zhengzhi, Han, Xiao, Guo, Min, Chen, Ke
• Format: Journal Article
• Language: English
• Published: Elsevier GmbH 01.10.2023; Elsevier
• Subjects: Fiber-optic Fabry–Perot sensor; Fiber-optic photoacoustic sensing; Spectral demodulation; Trace gas detection; Fiber-optic Fabry–Perot sensor; Trace gas detection; Spectral demodulation; Fiber-optic photoacoustic sensing
• ISSN: 2213-5979; 2213-5979
• DOI: 10.1016/j.pacs.2023.100560

An integrated near-infrared fiber-optic photoacoustic sensing demodulator was established for ultra-high sensitivity gas detection. The demodulator has capacities of interference spectrum acquisition and calculation, laser modulation control as well as digital lock-in amplification. FPGA was utilized to realize all the control and signal processing functions, which immensely improved the integration and stability of the system. The photoacoustic signal detection based on fiber-optic Fabry–Perot (F-P) acoustic sensor was realized by applying ultra-high resolution spectral demodulation technique. The detectable frequency of photoacoustic signal achieved 10 kHz. The system integrated lock-in amplification technology, which made the noise sound pressure and dynamic response range of sound pressure detection reached 3.7 μPa/√Hz @1 kHz and 142 dB, respectively. The trace C2H2 gas was tested with a multi-pass resonant photoacoustic cell. Ultra-high sensitivity gas detection was accomplished, which was based on high acoustic detection sensitivity and the matching digital lock-in amplification. The system detection limit and normalized noise equivalent absorption (NNEA) coefficient were reached 3.5 ppb and 6.7 × 10−10 cm−1WHz−1/2, respectively. The devised demodulator can be applied for long-distance gas measurement, which depends on the fact that both the near-infrared photoacoustic excitation light and the probe light employ optical fiber as transmission medium.