11Optical Fiber Intra‐cavity Laser Gas Sensing Technology
11.1 Theory of Optical Fiber Intra‐cavity Laser Gas Sensing
According to the spectral width of the light source, the modulation and demodulation mode of the light signal, and the structure of the gas absorption cavity, the fiber optical spectrum absorption technology (FOSAT) can be roughly divided into four kinds: non‐dispersive infrared absorption spectroscopy [1], tunable diode laser absorption spectroscopy [2], photoacoustic spectroscopy [3], and cavity absorption spectroscopy [4–6]. Among these methods in FOSAT, the optical fiber intra‐cavity laser gas sensing technology (OFICLGST) based on erbium‐doped fiber amplifier (EDFA) is one of novel cavity absorption spectroscopy technology ...
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