An angular velocity measurement system that can finely adjust the intensity ratio of signal light to reference light

Abstract

The invention discloses an angular velocity measurement system capable of finely adjusting the light intensity ratio of signal light to reference light. The system comprises a laser light source, a first beam splitter prism, a polarization beam splitter, a second beam splitter prism and a photoelectric detector. Lasers reflected and transmitted by the first beam splitter prism serve as signal light and reference light respectively, and after the polarization direction of the signal light is rotated through a second half-wave plate, linearly polarized vortex light is generated through a spiralphase plate to irradiate the polarization beam splitter. The signal light and the reference light are reflected and transmitted by the second beam splitter prism to generate optical heterodyne interference, and the photoelectric detector is used for detecting a difference frequency signal of the signal light and the reference light. According to the angular velocity measurement system, the polarization directions and the light intensities of the signal light and the reference light are controlled by using a first half-wave plate, the second half-wave plate and a polaroid such that the light intensities of the signal light and the reference light are equal or basically equal when interference occurs, namely, the interference of the light is the strongest at that time, and the difference frequency signal acquired by the photoelectric detector is the strongest.

Description

technical field [0001] The present invention relates to an angular velocity measurement system, more specifically, to an angular velocity measurement system that utilizes the transverse Doppler frequency shift effect of vortex light and optical heterodyne detection method and can finely adjust the ratio of signal light to reference light intensity . Background technique [0002] Vortices are one of the most common phenomena in nature, and they are ubiquitous in classical macroscopic systems such as water, clouds, and cyclones. A large number of theories and experiments have confirmed that vortices also exist in the optical wave field. Vortex light is a singular light with a spiral wavefront structure, and its beam center has a phase singularity, making its cross-sectional light intensity distributed in a ring-shaped hollow. As a form of wave, vortex light has orbital angular momentum due to the helical phase structure. The phase of vortex light contains azimuth term whe...

AI Technical Summary

Problems solved by technology

Using a spiral phase plate to measure the rotational angular velocity has obvious disadvantages. The signal light scattered by the rotating body is not in the same path as the reference light. The light intensity of the two beams is greatly different, which is not conducive to the output of the differential signal, or even undetectable.

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