Faraday detection method for removing modulation amplitude and light-intensity variation influences

A technology of modulation amplitude and detection method, which is applied in the field of Faraday detection that eliminates the influence of modulation amplitude and light intensity fluctuations. It can solve the problems of detection result errors, limit applications, and affect the measurement accuracy of Faraday modulators for small rotation angles, so as to solve measurement errors. , The effect of high stability and precision measurement
CN102928082AActive Publication Date: 2013-02-13BEIHANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIHANG UNIV
Publication Date
2013-02-13

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Abstract

A Faraday detection method for removing modulation amplitude and light-intensity variation influences relates to a method for accurately removing measurement errors caused by modulation amplitude and light-intensity variation in the process of measuring light polarization tiny rotating angles by using a Faraday modulator. According to the method, a digital phase-locked amplifier module is adopted to measure primary harmonic signals and secondary harmonic signals in signals to be demodulated, combining light-intensity signals of Faraday modulator incident light, parameters in the primary harmonic signals and related to the modulation amplitude and the incident light light-intensity are removed through resolving, and finally light polarization tiny rotating angles not influenced by modulation amplitude and light-intensity variation are obtained. The Faraday detection method can remove measurement errors caused by modulation amplitude and unstable incident light light-intensity when the Faraday modulator is used for measuring the light polarization tiny rotating angles, remarkably improves long-time measurement accuracy, and can be used in the process of using atomic spin magnetometers, atomic spin gyros and other instruments to accurately measure light polarization tiny rotating angles.
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Description

technical field

[0001] The invention relates to a Faraday detection method for eliminating the influence of modulation amplitude and light intensity fluctuations, which can be used as a precise measurement method for the tiny rotation angle of light polarization in instruments and equipment such as atomic magnetometers and atomic spin gyroscopes, and can also be used as a method for detecting Faraday A method for real-time monitoring of modulator modulation amplitude and incident light intensity. Background technique

[0002] The Faraday modulator detection method is a high-precision light polarization micro-rotation angle measurement method. Compared with the photoelastic modulation detection method and the polarization beam splitter prism differential detection method, it has higher detection sensitivity. Therefore, the atomic magnetometer and Atomic spin gyroscopes and other precision measuring instruments have extremely important and broad application prospects, and thei...

Claims

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