Apparatus and method for areflexia object in post-direction stimulated brillouin scattering detecting liquid

Abstract

The invention discloses a device and method for detecting the no reflection objects in liquid using backward stimulated Brillouin scattering. The device comprises a single longitudinal mode laser, reflector M1, 1/2 wave plate, glan prism, faraday 45 degree activizer, reflector M2, divergent lens, convergent lens, liquid cell containing the objects to be detected and photo detector. The laser from the single longitudinal mode laser converges in the liquid cell by the above system. When the light intensity of the convergence point reaches to the threshold of the stimulates Brillouin scattering, the backward stimulated Brillouin scattering is generated and returns at the original path, and output at the reflection port of the glan prism and received using the photo detector. When there is object at the laser convergence point in liquid, the laser is blocked and the backward stimulated Brillouin scattering is not generated, therefore there is no signal to output. The presentation of the object in liquid and the depth thereof can be detected by detecting whether there is backward stimulated Brillouin scattering signal or not at different depth of laser converging.

Description

technical field [0001] The invention relates to a detection device, in particular to a device and method for detecting non-reflective objects in liquid by backward stimulated Brillouin scattering. Background technique [0002] The traditional method of laser detection of underwater objects is to shoot the laser into the water. When encountering an underwater object, due to the reflection on the surface of the object to a certain extent, detect the return arrival time of the reflected light, and measure the laser emission time and the return arrival time of the reflected light. The time difference can be calculated according to the propagation speed of light to determine the depth of the object. However, the current development of anti-detection technology makes underwater objects have more concealed non-reflection and non-scattering characteristics, which makes the traditional method of relying on the reflection or scattering of underwater objects to be detected to be greatl...

AI Technical Summary

Problems solved by technology

However, the current development of anti-detection technology makes underwater objects have more concealed non-reflection and non-scattering characteristics, which makes the traditional method of relying on the reflection or scattering of underwater objects to be detected be greatly challenged.

Images