Dual-purpose visible light and infrared axial plumb infinite distance target device and calibration method

By designing a high-precision axial vertical infinity target device that can be used for both visible light and infrared, and by using a Cassegrain collimator and a high-stability base frame, combined with theodolite calibration methods, the complex problem of aligning the optical axis and azimuth axis in multi-band Kuder optical path imaging optoelectronic equipment was solved, achieving high-precision and stable vertical alignment of the optical axis.

CN119803430BActive Publication Date: 2026-07-21CENT CHINA OPTOELECTRONICS TECH RES INST (CHINA STATE SHIPBUILDING CORP 717TH RES INST)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CENT CHINA OPTOELECTRONICS TECH RES INST (CHINA STATE SHIPBUILDING CORP 717TH RES INST)
Filing Date
2024-12-30
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

In the existing multi-band Kuder optical path imaging optoelectronic equipment, the parallelism between the multi-light-integrated optical axis and the azimuth axis is complicated during the assembly and adjustment process, and the error of the 45° reflector causes the overall vertical error to double, making it difficult to achieve high precision and stability.

Method used

Design a high-precision axial vertical infinity target device that can be used for both visible light and infrared. The device uses a Cassegrain collimator as the infinity target device, combined with a high-stability dedicated base frame and a split design. The optical axis of the Cassegrain collimator is aligned vertically using a theodolite calibration method.

Benefits of technology

It simplifies the difficulty of vertical alignment of the multi-optical-integrated optical axis, improves the assembly and alignment process, and achieves high-precision parallelism and stability between the multi-optical-integrated optical axis and the azimuth axis, with the vertical error controlled within 2 arcseconds.

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Abstract

The application discloses a visible light and infrared dual-purpose axial plumb infinite distance target device and a calibration method, wherein the device comprises a base which is concave; a support platform which is installed in the middle concave part of the base; a reference platform which is installed on the support platform; a rack which comprises a vertical longitudinal arm and a horizontal arm which are perpendicular to each other, the longitudinal arm is vertically fixed on the base, and the horizontal arm is placed above the assembly reference platform; a black body light source, a fluorescent lamp and a Cassegrain collimator are sequentially arranged on the horizontal arm in the vertical direction, and the optical axis of the Cassegrain collimator is adjusted to be axial plumb. The device has high stability.
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