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
- Acta Optica Sinica
- Vol. 40, Issue 7, 0730003 (2020)
Fig. 1. Simulaed curves. (a) Response between amplitude and frequency; (b) relation between SNR and frequency
Fig. 2. Structure of photoacoustic probe. (a) Schematic of oil-gas separation and integrated sensor probe; (b) structure of oil-gas separation membrane
Fig. 3. Simulation of gas permeation through FEP membrane
Fig. 4. Absorption coefficients of C2H2 and interfering gases in the near-infrared region
Fig. 5. Diagram of detection system with gas dissolved in oil based on laser photoacoustic spectroscopy
Fig. 6. Photoacoustic signal voltage under different modulation currents
Fig. 7. Photoacoustic signal voltage versus oil-gas separation time
Fig. 8. Signals of C2H2 under different volume fractions. (a) Second harmonic signal; (b) peak voltage of second harmonic photoacoustic signal
Fig. 9. Result of Allan deviation analysis. Inset is continuous measurement results of C2H2 gas dissolved in oil with volume fraction of 10-6
Fig. 10. Measured volume fraction of C2H2 gas dissolved in oil
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