Cold diaphragm with light blocking ring structure

A technology of light blocking ring and cold diaphragm, applied in the field of optical components, can solve the problems of large stray light cold diaphragm, unable to effectively remove stray light radiation, difficult to provide cold diaphragm, etc., and achieve the effect of simple production

Inactive Publication Date: 2009-12-30
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to provide an effective cold diaphragm in practice because: (1) the black coating on the inner wall of the cold diaphragm cannot absorb stray light well (2) the size limitation of the Dewar makes the cold diaphragm unable to do enough Large and small cold apertures cannot effectively remove stray light radiation. If the size of the cold aperture is increased as much as possible, especially the opening size, it will increase the difficulty of cooling. (3) The inner wall of the cold aperture

Method used

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  • Cold diaphragm with light blocking ring structure
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  • Cold diaphragm with light blocking ring structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: Cylindrical and light-blocking ring contour arrangement 1 (see Figure 6 )

[0038] Here, the cold diaphragm is a cylindrical shape such as Figure 4 In 1 (its inner wall length L=19.3 mm, thickness is 2 mm, front end diameter QQ′=23.4 mm, rear end diameter PP′=23.4 mm), the entrance aperture is a circle such as Figure 4 4 of them (Aperture AA' = 12.8 mm), the detector is placed at the bottom as Figure 4 3 in (circumscribed circle diameter TT'=12.8 mm), QQ'=PP', AA'=TT'. The material is Kovar, and the inside is plated with a layer of black nickel with a thickness of 12μm (this thickness is ignored when calculating the light blocking ring). Detailed parameters are shown in Table 1. The design steps are: (see Figure 6 )

[0039] (1) Connect QT and intersect A'T' at point B, and cross B to make BB' perpendicular to QP', BB' is the height of the first light blocking ring, and QB' is the position of the first light blocking ring relative to the inner ...

Embodiment 2

[0055] Embodiment 2: Cylindrical and light-blocking ring contour arrangement 2 (see Figure 7 )

[0056] Here, the cold diaphragm is a cylindrical shape such as Figure 4 In 1 (its inner wall length L=19.3 mm, thickness is 2 mm, front end diameter QQ′=23.4 mm, rear end diameter PP′=23.4 mm), the entrance aperture is a circle such as Figure 4 4 (entrance aperture AA' = 12.8mm), the bottom end of the detector is placed as Figure 4 3 in (circumscribed circle diameter TT'=8 mm), QQ'=PP', AA'>TT'. The material is Kovar, and the inside is plated with a layer of black nickel with a thickness of 12μm (this thickness is ignored when calculating the light blocking ring). Detailed parameters are shown in Table 1. The design steps are: (see Figure 7 )

[0057] (1) Since TT′

[0058] (2) Connect QK and intersect A'K' at point B, and cross B to make BB' perpendi...

Embodiment 3

[0068] Embodiment 3: Cylindrical and light-blocking ring gradient arrangement (see Figure 8 )

[0069] Here, the cold diaphragm is a cylindrical shape such as Figure 4 In 1 (its inner wall length L=19.3 mm, thickness is 2 mm, front end diameter QQ′=23.4 mm, rear end diameter PP′=23.4 mm), the entrance aperture is a circle such as Figure 4 4 of them (Aperture AA' = 12.8 mm), the detector is placed at the bottom as Figure 4 3 in (circumscribed circle diameter TT'=8 mm), QQ'=PP', AA'>TT'. The material is Kovar, and the inside is plated with a layer of black nickel with a thickness of 12μm (this thickness is ignored when calculating the light blocking ring). See Table 1 for detailed parameters

[0070] The design steps are: (see Figure 8 )

[0071] (1) Connect QT and intersect A'T' at point B, and cross B to make BB' perpendicular to QP', BB' is the height of the first light blocking ring, and QB' is the position of the first light blocking ring relative to the inner ...

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Abstract

The invention discloses a cold diaphragm with a light blocking ring structure. The invention is characterized in that two light blocking rings are reasonably added into the internal wall of the cold diaphragm, and the surfaces of the light blocking rings are coated with a layer of black coating with excellent performance, thus effectively reducing stray light. The design can excellently improve the signal-to-noise ratio of the system, enhances the contrast ratio and improves the exploring and recognizing capacities of the whole system. Compared with cold diaphragms without the light blocking ring structure, the invention can effectively reduce stray light, and causes point source transmittance PST value to be attenuated corresponding to several orders of magnitude, the manufacture is easy, and the cost is low, thus being suitable for any cold diaphragm structures.

Description

technical field [0001] The invention relates to the technical field of optical elements, in particular to a cold diaphragm with a light-blocking ring structure, which is used as a cold diaphragm inside a Dewar to effectively reduce stray light radiation energy reaching a detector. Background technique [0002] Space optical systems, especially space infrared optical systems and some large space telescopes, all work in "harsh" environments with strong radiation sources (such as the sun, moon, and earth) outside the field of view of the system; and in the infrared long-wave band, the system The stray radiation energy of the internal mechanical structure and other long-wave radiation reaching the surface detector is also a factor that cannot be ignored. At the same time, when the detection target signal is very weak, these strong stray radiations are often several orders of magnitude higher than the detected target radiation intensity, and through the diffraction of the apertur...

Claims

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Application Information

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IPC IPC(8): G02B5/00G01J5/06
Inventor 张燕贺香荣王小坤曾志江李淘张文静范广宇
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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