A light and compact megapixel high-resolution space camera

A high-resolution, space camera technology, applied in the field of space optical remote sensing, can solve the problems of low image quality, reduce weight, shorten camera volume, etc., and achieve the effect of unobstructed optical path, small pixel size, and simple and compact structure

Active Publication Date: 2018-09-18
BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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Problems solved by technology

[0006] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide a light and small 100 million-pixel high-resolution space camera, which solves the problem of low image quality of the traditional visible light space camera at high sampling frequency, and enables the camera to realize When the sampling frequency is greater than 250lp / mm, the transfer function of the whole machine is greater than 0.1, and at the same time effectively shorten the size and weight of the camera

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  • A light and compact megapixel high-resolution space camera
  • A light and compact megapixel high-resolution space camera

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[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] The invention according to figure 1 The structure shown is implemented. The system includes: primary mirror 1, secondary mirror 2, third mirror 3 and vertical charge transfer detector assembly 4. Considering the thermal characteristics of the lens material and the difficulty of processing, etc., the optical material selection of each mirror assembly Glass-ceramics with zero expansion coefficient (ZERODUR). The single pixel area of ​​the detector in the vertical charge transfer detector assembly is 1μm 2 , considering the requirement of the space camera for the full well charge of the detector, the detector uses the pixel merging method invented in the patent publication No. Pixel usage, the effective pixel size is 2×2μm 2 , the corresponding Nyquist frequency is 250lp / mm.

[0021] The primary mirror 1 is a concave four-orde...

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Abstract

The invention discloses a small 100-million pixel high resolution space camera, comprising an off-axis three-mirror optical system and a vertical charge transfer detector component, wherein the optical system's relative aperture is 2-3, comprising a main mirror, secondary mirror and third mirror; the main mirror is concave-quartic double hyperbolic mirror, the secondary mirror is convex-quadratic hyperbolic mirror and the third mirror is ellipsoid concave spherical mirror. The modulation transfer function of visible light wave band of the optical system can be over 0.4 in field of view in the Qwest frequency of 167lp / mm-250lp / mm. The vertical charge transfer detector component comprises a vertical charge transfer detector and corresponding signal processing circuit, wherein the pixel scale of the vertical charge transfer detection is 100 million and the area of single pixel is 1Mum2. The invention is applicable to optical sensing-grounding imaging in visible light wave band.

Description

technical field [0001] The invention relates to a space camera. More specifically, it relates to a small relative aperture and 100 million pixel scale light and small high-resolution space camera for imaging in the visible light band, which belongs to the field of space optical remote sensing technology. Background technique [0002] At present, the detectors used in space cameras for visible light band imaging at home and abroad are all CCD or CMOS types, and the area of ​​a single pixel of the detector is larger than 5×5μm 2 , the corresponding Nyquist frequency is less than 125lp / mm, and the corresponding optical system often adopts a large relative aperture, that is, a large aperture and a long focal length. If CCD or CMOS is used to realize high-resolution imaging with a scale of 100 million pixels, the space camera cannot be light and small. The vertical charge transfer detector is a new type of visible light detector independently developed by my country. It has the ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B17/06G01J3/28G01J3/02
CPCG01J3/0205G01J3/28G02B17/0642
Inventor 张文昱王保华阮宁娟金建高张琢吕红
Owner BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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