Composite Optical Window for Photogrammetric Cameras in Vacuum and Low Temperature Environment

Abstract

The invention discloses a composite optical window for a photographic camera arranged in a protection cabin during deformation measurement of a spacecraft. The composite optical window is formed by two portions, that is, an inner ring window and an outer ring window, which are integrated through gluing. The inner ring window is made of A1-level or higher-level fused silica glass; the outer ring window is made of common silica glass; and an interface between the inner ring window and the outer ring window forms an inclination angle of 10 degrees with the window surface normal line. The composite optical window mainly plays a role of realizing total reflection of the light incident into the protection cabin to prevent stray flash from entering a camera lens. The composite optical window canobviously overcome influence of a window of the protection cabin on work of the photographic camera, eliminate the over-exposure phenomenon of the shooting image due to reflection of the window for aflash lamp in the photogrammetry process, and meet photogrammetry application requirements under a special environment of needing a closed optical window.

Description

technical field [0001] The invention belongs to the technical field of optical testing, and in particular relates to a component in a measuring camera, especially an optical window. Background technique [0002] In the vacuum and low temperature environment, when the photogrammetry method is used to measure the deformation of the spacecraft, the photogrammetry camera needs to be photographed at different positions in the container, and then the measurement is carried out. This step is the photogrammetry in the vacuum and low temperature environment. Important guarantee. Since the photogrammetry camera cannot be used directly in a vacuum and low temperature environment, it is necessary to design a special protection cabin. See for example figure 1 , figure 1 The structural diagram of the protective cabin of the photogrammetry camera is shown, wherein the optical projection window 1 is installed on the protective cabin 4, which mainly plays the role of providing an undistor...

AI Technical Summary

Problems solved by technology

[0003] At present, in the vacuum and low temperature environment in China, the protection cabins used for photogrammetry use traditional optical windows. During the work process, the strong flashes emitted by the flash will be reflected into the lens of the photogrammetry camera through the window glass, resulting in digital photos taken Part of the area is exposed, which affects the shooting effect of the camera and causes measurement errors

Especially for the thermal vacuum test, if the shooting effect is poor, it may lead to large errors in the test data and affect the success of the test

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