Fiber bragg grating demodulation method and device based on VCSEL and acetylene absorption peak

The invention relates to the technical field of optical fiber sensing/photoelectric detection, and provides a VCSEL (Vertical Cavity Surface Emitting Laser) and acetylene absorption peak-based fiber bragg grating demodulation method and a VCSEL and acetylene absorption peak-based fiber bragg grating demodulation device. Comprising the steps that a VCSEL meeting the standard is selected, the VCSEL can normally work at the temperature of 0-40 DEG C, tuning of current and voltage on the wavelength of the laser meets the design requirement, and the effective scanning range is 8 nm when the VCSEL is used without temperature control. And an FBG with a proper wavelength is selected, so that a temperature-control-free detection system can be conveniently built. Due to the fact that the scanning wavelength ranges of a laser device are different at different temperatures, absorption peak recognition is difficult, and the invention also introduces a method for accurately recognizing absorption peaks. The VCSEL driving m