Method for measuring additional phase delay introduced by light source wavelength fluctuation of optical voltage transformer

By adopting the modulation technology of annular radial polarized grating and electro-optical crystals in the optical voltage transformer, the additional phase delay introduced by the wavelength fluctuation of the light source is directly measured and compensated for the light source center wavelength fluctuation, the problem of poor measurement stability and reliability of the optical voltage transformer is solved, and higher measurement accuracy and reliability are achieved.

CN119714805APending Publication Date: 2025-03-28FUZHOU UNIV
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Patent Information

Application Number
CN202411909565.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-24
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

Existing optical voltage transformers cannot directly measure the electro-optical phase delay, and the additional phase delay introduced by the wavelength fluctuation of the light source is coupled in a nonlinear form to the change of light intensity, making it difficult to extract and compensate, affecting the stability and reliability of the measurement.

Method used

An optical voltage transformer based on an annular radial polarized grating is used to modulate the measured AC voltage to 2 times the half-wave voltage of the electro-optical crystal, and use the linear relationship of the rotation angle of the spot, the additional phase delay introduced by the wavelength fluctuation of the light source is directly measured and extracted, and compensated.

Benefits of technology

Direct linear measurement and compensation of the additional phase delay introduced by the wavelength fluctuation of the light source center is realized, and the measurement stability and reliability of the optical voltage transformer are improved.

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Abstract

The invention provides a method for measuring additional phase delay introduced by optical voltage transformer light source wavelength fluctuation. The method comprises the following steps: S1, constructing an optical voltage transformer for realizing linear demodulation of phase delay based on an annular radial polarization grating; the optical voltage transformer comprises a light source, a polarizer, an electro-optical crystal, a quarter-wave plate, an annular radial polarization grating and a four-quadrant detector. An electric field where the electro-optical crystal is located is generated by alternating current voltage to be measured; and S2, modulating a to-be-measured AC voltage into two times of the half-wave voltage of the electro-optical crystal, and obtaining the additional phase delay introduced by the fluctuation of the central wavelength of the light source according to the light spot rotation angle measured by the optical voltage transformer. Direct linear measurement of phase delay is realized based on the annular radial polarization grating, and then additional phase delay introduced by light source center fluctuation is completely extracted and compensated, so that the problem of light source wavelength fluctuation is solved.
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