Light path structure, image spectrometer and spectral characteristic processing method

The invention discloses a light path structure, an image spectrometer and a spectral characteristic processing method, the light path structure comprises an entrance slit, a collimating focus lens, a spectro-grating and a light extraction lens, the collimating focus lens is provided with an arc-shaped concave surface, and the light extraction lens is located on one side of the arc-shaped concave surface and is arranged opposite to the arc-shaped concave surface; the entrance slit and the spectro-grating are oppositely arranged on the two sides of the light taking lens and are obliquely arranged; light emitted by the entrance slit obliquely enters the arc-shaped concave surface, the arc-shaped concave surface converts the light into collimated parallel light, the collimated parallel light obliquely enters the light splitting grating, the light splitting grating disperses the parallel light into spectral images with various wavelengths and reflects the spectral images back to the arc-shaped concave surface of t