Optical path spectrum detection method and detection system based on air suspension

The invention discloses an optical path spectrum detection method based on air suspension, and the method comprises the steps: introducing reflected light through a light through hole, calculating a reflection coefficient, and correcting the reflection coefficient; an SPR resonance angle is adjusted through an SPR sensor, and the change relation of the phase difference of the two components p and s of the polarized light along with the gas refractive index and the phase responsivity value are obtained through calculation; according to the phase difference between the phase responsivity of the SPR resonance angle and the phase responsivity of the original phase angle, the gas refractive index is calculated; road spectrum elevation information at a certain signal moment is analyzed, and a single air suspension road spectrum is delimited; and integrating a plurality of groups of road spectrums, and combining a plurality of road spectrum output modes. An air cavity in an original vehicle air suspension, an origin