Device for alignment of infrared lens set under low temperature

Abstract

The present invention discloses a device for alignment of an infrared lens set under low temperature. The device comprises a housing pedestal, a cold transferring copper cavity, a stock solution inner container, a strain adjusting rack, an installation cap, millesimal nuts, magnets, a lens set tube socket, a transition installation block, an air exhaust interface, a lead interface and a light transmission window. A cavity formed by the housing pedestal, the cold transferring copper cavity, the stock solution inner container and the installation cap is configured to provide low-temperature vacuum environment for an adjusted lens set. The magnets are arranged on the strain adjusting rack and the external portion of the housing to adjust the millesimal nuts arranged at the external portion of the device, and the repulsive force generated by changing the distance of the magnets is employed to drive the alignment fine tuning of the lens. A laser welder is employed to perform spot welding fixing of the fixed edges of the lens and the housing of the lens set after alignment to complete the alignment operation of the lens set in the low temperature. The problem of alignment adjusting of the infrared lens set in the low temperature is solved, and the precision of alignment, assembling and calibration is improved.

Description

technical field [0001] The invention relates to an infrared detector assembly packaging technology and an infrared lens group low-temperature optical alignment technology, in particular to an infrared lens group alignment device and an alignment method for working in a liquid nitrogen temperature region, which are suitable for infrared lenses used in an infrared detector assembly. Group centering adjustment operation at low temperature. Background technique [0002] The preparation technology of infrared detector components is of great significance in the fields of aerospace and aviation infrared. With the expansion of wavelengths to long wavelengths and the improvement of detection sensitivity, infrared detectors must work at deep and low temperatures, which also makes infrared detectors mostly use Dewar packages to form infrared detector Dewar components. In the development direction of the packaging technology of infrared detector components, one of the trends is the dev...

AI Technical Summary

Problems solved by technology

Due to the influence of assembly stress and the thermal expansion and contraction of the lens structure, the alignment accuracy at room temperature will inevitably appear at low temperature. Misalignment of alignment accuracy and unmeasurable deviations

In the preparation of traditional infrared lens groups, one method is to control the accuracy of centering by controlling the tolerance of parts and repeated assembly measurements. The cost is high; in addition, in the patent "A Method for Installing and Adjusting Infrared Lens" (public number: CN102998767A), a method of using a dual optical path measuring instrument for centering and adjusting the infrared lens is introduced

However, since the two methods cannot realize the centering operation of the lens group at low temperature, they cannot solve the problem of misalignment of the centering accuracy and unmeasurable deviation of the lens group when used at low temperature

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