A novel shearing interferometer detection device and detection method for suppressing skylight background noise

By adopting a new shear interference device based on the Machzend interferometer in the optical search and tracking telescope, the problem of the influence of skylight background noise is solved, and dark and weak target detection and precise direction functions are achieved throughout the day.

CN115291293BActive Publication Date: 2025-03-25CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202210996352.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-08-19
Publication Date
2025-03-25
Estimated Expiration
2042-08-19

AI Technical Summary

Technical Problem

The existing optical search tracking telescopes are affected by skylight background noise, and the detection period, capability and accuracy are limited. The existing suppression methods such as field of view control, spectral filtering and polarization filtering have limitations.

Method used

A new shear interference device based on the Machzend interferometer structure is adopted. By introducing a light path difference compensation mechanism, the two shear beams and other optical paths are made, combined with phase modulation and shear translation mechanism to suppress the background noise of skylight.

Benefits of technology

The detection and tracking of dark and weak targets throughout the day is achieved, the precise direction of the laser beam and the aircraft's attitude control throughout the day are significantly improved, and the detection capability and accuracy are significantly improved.

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Abstract

The present invention provides a novel shearing interference detection device for suppressing sky light background noise, comprising: a Mach-Zehnder interferometer, an optical delay device, a phase modulation device and a shearing interference mechanism; the Mach-Zehnder interferometer splits the incident light into two beams and interferes; the shearing interference mechanism causes the two beams formed by the Mach-Zehnder interferometer to produce a suitable shearing amount, so that the target light interferes while the sky light background does not interfere; the optical delay device compensates for the optical path difference between the two sheared light beams to achieve interference of wide-spectrum target light; the phase modulation device can cause the interference fringes of the target light formed by the two sheared light beams to produce periodic changes, thereby modulating the target light energy to a high-frequency region where the sky light background is weak, greatly suppressing the influence of the sky light background, and then realizing the detection of dim targets during the day. The present invention realizes the discovery and tracking of dim and small targets by large telescopes all day, the precise pointing of laser beams all day, and the all-day attitude control of aircraft.
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