Acta Optica Sinica, Volume. 40, Issue 7, 0730003(2020)
Technique for Detection of Dissolved Gas in Oil Based on Miniature Photoacoustic Sensor
Based on the non-resonant photoacoustic spectroscopy and the non-porous membrane oil-gas separation theory, we design a miniature detection module by integrating a photoacoustic gas sensor with an oil-gas separation membrane to satisfy the demand for online monitoring of the oil-immersed power transformer. This design can be realized by combining a polytetrafluoroethylene propylene (FEP) polymer membrane with a diameter of 40 mm with a photoacoustic chamber with a volume of only 0.3 mL. The designed module exhibits a small size, short oil-gas separation time, and real-time online detection. When the fault characteristic gas dissolved in the oil diffuses into the gas chamber, the techniques such as near-infrared laser photoacoustic spectroscopy, wavelength modulation, and second-harmonic detection are used to achieve high-sensitivity gas detection. The experimental detection results of the characteristic C2H2 gas prove that an oil-gas separation balance in the oil sensing system with dissolved gas can be realized within 3 h at an oil temperature of 60 ℃. Furthermore, the measurement error is within ±30% for the C2H2 gas dissolved in oil with a volume fraction of 10 -6.
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Fengxiang Ma, Yu Tian, Ke Chen, Feng Jin, Wang Zhang, Jiong Qi, Qingxu Yu. Technique for Detection of Dissolved Gas in Oil Based on Miniature Photoacoustic Sensor[J]. Acta Optica Sinica, 2020, 40(7): 0730003
Category: Spectroscopy
Received: Nov. 20, 2019
Accepted: Dec. 30, 2019
Published Online: Apr. 15, 2020
The Author Email: Chen Ke (chenke@dlut.edu.cn)