Underwater Brillouin scattering spectrum measurement device and measurement method

Abstract

The invention discloses an underwater Brillouin scattering spectrum measurement device and measurement method. In the measurement device, an iodine molecule absorption cell receives a scattered light signal and filters Brillouin scattered light; the filtered Brillouin scattered light passes through a beam splitter, a beam expander and a dual-channel FP etalon in sequence; the beam splitter extracts a small part of the Brillouin scattered light, and a reference light energy detection device receives and detects a reference energy value; the beam expander controls an optical path emission angle so as to control the line width of the dual-channel FP etalon; and the two-channel FP etalon is used for transmitting two parts of scattered light on the two sides of the Brillouin spectrum to a first passing light energy detection device and a second passing light energy detection device respectively to detect an energy value. According to the underwater Brillouin scattering spectrum measurement device and measurement method, the spectrum of Brillouin scattering light can be calculated in real time, the measurement function of the edge detection technology is expanded, measurement of the whole Brillouin scattering spectrum is achieved, and good timeliness and stability are achieved.

Description

technical field [0001] The invention relates to the technical field of optical measurement, in particular to an underwater Brillouin scattering spectrum measuring device and an underwater Brillouin scattering spectrum measuring method. Background technique [0002] Ocean temperature and salinity are the basic parameters of marine science including ocean dynamics, ocean environment, seawater physical process, chemical process and biological process, and are the most important physical characteristics in the ocean environment. important needs. Traditionally, the monitoring of ocean temperature and salinity is mainly based on contact measurement, which has high measurement accuracy (the measurement accuracy of temperature and salinity can reach 0.01°C and 0.01‰, respectively), but it is aimed at monitoring large-scale, high-grid-density sea areas. , this method is subject to certain limitations. [0003] Relatively speaking, remote sensing has the advantages of convenient acq...

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Problems solved by technology

Traditionally, the monitoring of ocean temperature and salinity is mainly based on contact measurement, which has high measurement accuracy (the measurement accuracy of temperature and salinity can reach 0.01°C and 0.01‰, respectively), but it is aimed at monitoring large-scale, high-grid-density sea areas. This method is subject to certain limitations when

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