The invention discloses an
optical fiber remote-detection type multifunctional gas leakage listening instrument and method and belongs to the technical field of
optical fiber sensing and gas detection. The instrument comprises a
laser light source, an optical cable, an
optical fiber leakage listening probe, a
broadband light source, an
optical fiber coupler, a serrated
signal generator, an
adder,a sinusoidal
signal generator, a phase-locked loop, a
spectrometer and an industrial control computer. The optical
fiber leakage listening probe is of a double-
cantilever-beam structure, is used for directly detecting
acoustic wave signals generated by leakage of gas, can reduce the influence of
environmental noise and vibration on measurement of photoacoustic signals with combination of an activenoise reduction technology, and meanwhile achieves high-sensitivity and high-reliability measurement of the concentration of the gas, namely, the optical
fiber leakage listening probe has an opticalear function and an optical
nose function. By designing two optical
fiber extrinsic Fabry-Perot interferometers with the different cavity lengths, simultaneous non-interference
demodulation can be conducted on two
cantilever beam acoustic sensors through one
spectrometer, so that the
system structure is simplified. The optical fiber remote-detection type multifunctional gas leakage listening instrument provided by the invention has the advantages of
remote detection and
intrinsic safety.