Device and method for detecting signal intensity of frequency-shift excitation raman spectrum based on tunable laser

The invention discloses a device and a method for detecting signal intensity of a frequency-shift excitation raman spectrum based on tunable laser, relates to the technical field of signal intensity detection of raman spectrums, and aims at solving the problems that a frequency-shift excitation device is complicated in structure and poor in real-time performance and cannot detect a wide spectrum material, the process of inverting an original raman spectrum signal according to a differential raman spectrum signal is large in calculated quantity, and an error is introduced. Deflection and pitch attitudes of a grating are controlled by a grating controller; the outgoing wavelength of a semiconductor laser device is changed by changing the deflection angle of the grating; the level of excitation light power is adjusted by controlling the efficiency of coupling a light beam to an excitation fiber; obtained initial differential raman spectrum signals are integrated and normalized to obtain a normalized differential raman spectrum signal; N data points are uniformly extracted and absolute values are taken for summation, so as to obtain a raman spectrum signal intensity value. The device and the method can be used for obtaining the signal intensity of the raman spectrum.