Fig. 1. Physical model of the light beam incident on the grating

Fig. 2. Optical path structure of the monochromator

Fig. 3. Mechanical structure of the monochromator

Fig. 4. Point diagram at different wavelengths

Fig. 5. Test scenario diagram

Fig. 6. Apertures with different heights

Fig. 7. Test spectral lines of mercury lamp with different wavelengthes at different aperture heights

Fig. 8. Spectral resolution of the optical system corresponding to different wavelengths and aperture heights