Optical system and design method for large caliber grating imaging spectrometer
An imaging spectrometer and large-aperture grating technology, applied in optics, optical components, instruments, etc., can solve problems such as instrument scale imbalance and achieve good imaging quality
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[0040] Example 1:
[0041] See figure 1 , The present invention is an optical system of a large-aperture grating imaging spectrometer, including a promising remote objective lens and a spectral imaging system. The telephoto objective optical system of the present invention is coaxially installed with a secondary mirror 1 and a primary mirror in sequence along the propagation direction of incident light. 2. The spectral imaging system includes a collimating objective lens 4, a grating 5, and an imaging objective lens 6, and the optical path adopts an M-type structure.
[0042] The telephoto objective of the present invention is a catadioptric large-aperture telephoto objective, that is, the optical system of the telephoto objective is a large-aperture optical system; the center of the front surface of the secondary mirror 2 is coated with a reflective film, and the entire rear surface of the primary mirror 1 It is coated with a reflective film; the optical system forms a large-aper...
Example Embodiment
[0057] Example 2:
[0058] The optical system and design method of the large-aperture grating-type imaging spectrometer are the same as in Embodiment 1, and the present invention is used to solve the design problem of the optical system of the grating-type imaging spectrometer.
[0059] The optical system of the designed grating imaging spectrometer is composed of a front telephoto objective lens and a spectral imaging system. The telephoto objective lens is composed of a primary mirror 2 and a secondary mirror 1. The primary mirror 2 and the secondary mirror 1 are both catadioptric lenses and spectral imaging The system consists of a slit 3, a collimating objective lens 4, a convex grating 5 and an imaging objective lens 6. The incident light from the target is imaged on the plane of the slit 3 through the catadioptric lenses 1 and 2. The slit 3 acts as a field diaphragm to pass the image of the object strip and block the light of other parts, and the strip image of the target Th...
Example Embodiment
[0061] Example 3:
[0062] The optical system and design method of the large-aperture grating imaging spectrometer are the same as those in the embodiment 1-2. The improved Cassegrain objective lens designed by the present invention is used in the telephoto objective. According to the characteristics of the optical system, the Cassegrain system is selected as the initial structure In the design process, first determine the value of the incident aperture. According to the relationship between the Cassegrain system aberration, the blocking ratio α, the magnification β, and the constraint condition that the curvature of the primary and secondary mirrors and the distance between the primary and secondary mirrors d are less than zero, Obtain the structural parameters in the telephoto objective lens design, and after repeated calculations for several times, the initial structural parameters are finally obtained. On this basis, the primary and secondary mirrors are all spherical and two ...
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