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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

Inactive Publication Date: 2012-07-04
XIAN TECHNOLOGICAL UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0008] The traditional telescopic objective lens optical system and spectral technology have been relatively mature after years of development, but in the field of optical application technology, there are still some technical problems to be solved in the combined application technology of large-aperture telescopic objective lens and convex grating spectral imaging system, such as After combining the two, there is a problem that the entire instrument is out of proportion

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  • Optical system and design method for large caliber grating imaging spectrometer
  • Optical system and design method for large caliber grating imaging spectrometer
  • Optical system and design method for large caliber grating imaging spectrometer

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Embodiment 1

[0041] see figure 1 , the present invention is an optical system of a large aperture grating type imaging spectrometer, comprising a telescopic objective lens and a spectral imaging system, the telescopic objective lens optical system of the present invention is coaxially installed with a secondary mirror 1 and a primary mirror in sequence along the propagating 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-shaped structure.

[0042] The telescopic objective lens of the present invention is a catadioptric large-diameter telescopic objective lens, that is, the optical system of the telescopic objective lens is a large-diameter 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 has under...

Embodiment 2

[0058] The optical system and design method of the large-aperture grating 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 imaging spectrometer.

[0059] The optical system of the designed grating imaging spectrometer is composed of a front telescopic objective lens and a spectral imaging system. The telescopic objective lens is composed of a primary mirror 2 and a secondary mirror 1, both of which are catadioptric lenses. 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 object is imaged on the plane of the slit 3 through the catadioptric lenses 1 and 2, and the slit 3 acts as a field diaphragm to pass the image of the object strip and block other parts of the light. After the spherical collimation objective lens 4 is irradiated on the convex grating 5 of the dispersion ...

Embodiment 3

[0062] The optical system and design method of the large-aperture grating imaging spectrometer are the same as in Embodiment 1-2. The improved Cassegrain objective lens designed by the present invention is used in the telescopic objective lens. 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 aberration of the Cassegrain system and the obscuration ratio α, the magnification β, and the constraints that the curvature of the primary and secondary mirrors and the distance between the primary and secondary mirrors d are all less than zero. Obtain the structural parameters in the design of the telescopic objective lens, and finally obtain the initial structural parameters through repeated calculations. On this basis, both the primary and secondary mirrors adopt spherical surfaces and use two refracting s...

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Abstract

The invention relates to an optical system and a design method for a large caliber grating imaging spectrometer. The invention solves the problem of excessively low energy utilization rate of the grating imaging spectrometer by adopting a large caliber telescopic objective. Due to the catadioptric configuration of an improved gassegrain system, the invention solves the problems of excessively large barrel length and excessively large volume of a large caliber transmission-type telescopic objective and ratio imbalance of a complete instrument formed after the large caliber transmission-type telescopic objective is combined with a spectral imaging system. The large caliber telescopic objective is combined with the spectral imaging system with a convex surface grating to form the optical system for the large caliber grating imaging spectrometer. The optical system has a good aberration correction effect in the broad band range and obtains high imaging quality. When the telescopic objective is matched with the spectral imaging system in a relative aperture mode, the value aperture of the spectral imaging system is greater than that of the telescopic objective, so that the optical system is effectively prevented from generating vignetting. According to the invention, an aspherical mirror is not adopted in the whole optical system, so that the processing difficulty and the cost of the whole optical system are reduced. The invention is suitable for the technical field of an imaging spectrum.

Description

technical field [0001] The invention belongs to the field of optical technology, and mainly relates to an optical system of a grating dispersion imaging spectrometer, in particular to an optical system and a design method of a large aperture grating imaging spectrometer, and is applicable to the technical fields of optical design, material detection, and imaging spectroscopy. Background technique [0002] Imaging spectrometer is an optical remote sensing instrument developed on the basis of multispectral remote sensing imaging technology in the 1980s that can obtain two-dimensional spatial information and one-dimensional spectral information of objects. It is widely used in military, Marine and geological exploration and other fields. Imaging spectrometers can be divided into dispersion type, filter type, interference type and computed tomography type according to the working principle. Among them, the dispersive imaging spectrometer has been widely used due to its simple p...

Claims

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Application Information

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IPC IPC(8): G01J3/28G02B13/02G02B17/08G02B27/00
Inventor 韩军占春连吴玲玲路绍军李珣于洵胡加兴尚杨卢飞李正琪陈靖尚小燕郭荣礼聂亮张维光
Owner XIAN TECHNOLOGICAL UNIV
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