Device and method for compensating for detection polarization fluctuation errors of rotation angles of linearly polarized light in online manner

Abstract

The invention discloses a device and a method for compensating for detection polarization fluctuation of rotation angles of linearly polarized light in an online manner. The device comprises an optical module and a measurement control module. The optical module comprises a reference light path and a signal detection light path and mainly comprises a laser device, a polarizer, a liquid crystal variable-phase retarder, a photoelastic modulator, a 1 / 4 wave plate, a to-be-measured atom gas chamber sample, polarization beam splitting prisms and the like; the measurement control module comprises balance differential detectors, a liquid crystal driver, a photoelastic controller, a phase lock amplifier and a data acquiring and processing unit. The device and the method have the advantages that error sources of various devices do not need to be differentiated for optical detection systems with the multiple complicated polarization devices, only characteristics of input ends and 'black box' type processing modes for signals of output ends need to be considered, accordingly, compensation and correction for eliminating detection random errors of the rotation angles of the light in real time can be implemented on the basis of photoelastic modulation, and the signals can be stably detected in a high-precision manner for a long time.

Description

technical field [0001] The present invention relates to the technical field of polarized light rotation angle detection, in particular to an online polarization fluctuation error compensation device and stable control method for linearly polarized light rotation angle detection. High-precision polarization detection device and method. Background technique [0002] In order to meet the long-term stable measurement requirements of high-precision atomic spin gyroscopes, the use of optical polarization modulation detection methods, especially high-frequency modulation of optical rotation angles based on photoelastic modulation, can effectively improve the detection ability of weak rotation angles of the linear polarization plane. Isolate low frequency noise, 1 / f noise and slow drift of the system. [0003] However, in the process of long-term and high-precision optical detection of weak light rotation angles, various optical devices such as polarizing elements, wave plates and ...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of random polarization error in the high-precision measurement of weak light rotation angle, and propose a linearly polarized light rotation angle detection polarization fluctuation error online compensation device and method

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