Fig. 1. Simulation curve: (a) The original Lorentz function accounts for 5% of the total peak width; (b) The original Lorentz function accounts for 95% of the total peak width

Fig. 2. Fitting curve of pressure and Y

Fig. 3. Curve comparison of pressure and Y after adding the laser linewidth

Fig. 4. Curve comparison of pressure and Y after adding white noise with different amplitude coefficients

Fig. 5. When the frequency is 0.1 times the signal frequency, the curve comparison of pressure and Y after adding background interference of different amplitudes

Fig. 6. Curve comparison of the pressure and Y after adding background interference of different frequencies

Fig. 7. The effect of background frequency changes on mathematical models

Fig. 8. Gauss fitting and Lorentz fitting curves under different pressures

Fig. 9. The fitting curve of measured pressure and Y