Frequency-division-multiplexed fiber-optic photoacoustic sensor

Simultaneous dissolved gas detection in transformer oil

Uses frequency-division multiplexing with two lasers to simultaneously excite photoacoustic signals of C2H2 and CH4, requiring no oil consumption, achieving equilibrium within 2 h at 60 °C for anti-electromagnetic interference in-situ monitoring.

Li, Chenxi · Ma, Fengxiang · Chun, Sun · Qi, Hongchao · Xiao, Han · Guo, Min · Chen, Ke

Sensors and Actuators, B: Chemical 2025

Specifications

dissolved C H

{'zh': '约0.1', 'en': '0.1'} μL·L⁻¹

of dissolved CH

{'zh': '约0.1', 'en': '0.1'} μL·L⁻¹

Advantages

Oil-gas equilibrium time ≤ 2 h at 60 °C