Free curved surface Offner convex surface grating spectrum imaging system

A spectral imaging and convex grating technology, applied in the field of spectral imaging, can solve problems such as difficult system installation and narrow spectral range, and achieve the effects of avoiding difficulties, correcting residual aberrations, and simple structure

Active Publication Date: 2018-08-14
ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

However, the short slit length is only 10mm, the spectral range is narrow, and the main mirror and the third mirror are separated, and the components are eccentric and tilted, which brings difficulties to the system installation and adjustment.

Method used

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  • Free curved surface Offner convex surface grating spectrum imaging system
  • Free curved surface Offner convex surface grating spectrum imaging system
  • Free curved surface Offner convex surface grating spectrum imaging system

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example

[0036] The first-order parameters of the system in the design example are: the spectral range reaches 200-1500nm, covering deep ultraviolet, visible light to near-infrared bands, the slit length is 30mm, the F number is 3.8, the pixel size is 16μm, and the line logarithm of the convex reflective grating is 150lines / mm. The results of the modulation transfer function MTF of the system at 200nm, 800nm, 1000nm and 1500nm correspond to Figure 2 to Figure 5 . When the cutoff frequency is 32lines / mm, the transfer functions of all fields of view are close to the diffraction limit. And the maximum spectral line bending and chromatic aberration of all wavelengths in the whole system are less than 1 micron.

[0037] The parameters of the optical system are shown in Table 1 to Table 3:

[0038]

[0039]

[0040] Table 1 System parameters

[0041] ZP1

[0042] Table 2 Zernike polynomial coefficients of primary mirror / three mirrors

[0043] ZP1

[0044] Table ...

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Abstract

The invention discloses a free curved surface Offner convex surface grating spectrum imaging system comprising a slit, a primary mirror, a convex surface reflecting grating, three mirrors and a detector, wherein the convex surface reflecting grating is used as an aperture diaphragm of the system, the system is of an image side telecentric structure, reflection occurs after light rays are incidentonto the primary mirror via the slit, then the light rays are incident onto a convex surface grating via reflection, the light rays are diffracted on the convex surface grating, and first order diffracted light different in wavelength is incident onto the three mirrors and then reflected by the three mirrors to reach the detector. In the system, a free curved surface shape is adopted; the primarymirror, the convex surface reflecting grating and the three mirrors are free from eccentricity and inclination; the primary mirror and the three mirrors adopted the same surface shape structure; the primary mirror and the three mirrors form a whole piece of a big free curved surface reflector, and the free curved surface reflector and the convex surface reflecting grating are configured concentrically. The system described above is simple in structure, difficult system installing and debugging operation and aligning operation caused by inclination and eccentricity of the reflector can be prevented, and residual image aberration which is difficult for a spherical surface Offner convex surface grating spectrum system to rectify caused by can be effectively rectified.

Description

technical field [0001] The invention relates to the technical field of spectral imaging, in particular to a free-form Offner convex grating spectral imaging system. Background technique [0002] Spectral imaging technology is a new type of multi-dimensional information acquisition technology that combines imaging technology and spectral technology. It can obtain two-dimensional spatial information and one-dimensional spectral information of the detected target to form a data cube. Spectral imaging technology has broad application prospects in military reconnaissance and investigation of agriculture, forestry, water, soil, and mining lamp resources. [0003] The Offner convex grating spectral imaging system is a common spectral imaging instrument, which is developed on the basis of the reflective Offner relay imaging system and consists of two concave spherical mirrors and a convex spherical grating. However, the current Offner convex grating system adopts a spherical struct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/28G01J3/18G01J3/02
CPCG01J3/02G01J3/18G01J3/2823G01J2003/1842
Inventor 魏立冬周锦松冯蕾景娟娟李雅灿杨雷付锡禄何晓英卜美霞
Owner ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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