Device and method for measuring gas Rayleigh-Brillouin scattering spectrum lines

A Brillouin scattering and measurement device technology, applied in the field of gas detection, can solve problems such as difficult to achieve high signal-to-noise ratio and high spectral resolution, weak Rayleigh-Brillouin signal, etc., and achieve high precision and high stability Signal detection, small size, easy to use effect

Active Publication Date: 2022-02-25
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

[0004] The purpose of the present invention is to use the principle of optical heterodyne to solve the problem that the Rayleigh-Brillouin signal in the existing atmospheric remote sensing detection is weak, and it is difficult to achieve high signal-to-noise ratio and high spectral resolution, and to provide a gas Rayleigh-Brillouin Measuring device and method of Brillouin scattering spectrum to achieve high-precision, high-efficiency and real-time detection

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  • Device and method for measuring gas Rayleigh-Brillouin scattering spectrum lines
  • Device and method for measuring gas Rayleigh-Brillouin scattering spectrum lines
  • Device and method for measuring gas Rayleigh-Brillouin scattering spectrum lines

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Embodiment

[0019] Embodiment: enumerate a preferred implementation case of the present invention below (referring to figure 1 ). A device for measuring the Rayleigh-Brillouin scattering spectrum of a gas, in which the first laser 1 (Nd:YAG multi-longitudinal mode pulse laser) sequentially emits pulsed lasers of different frequencies within the same time interval, and after 1 / 2 After the wave plate 3, the vertically polarized light is converted into horizontally polarized light, which enters through the polarization beam splitter 4 and the quarter wave plate 5 in turn, and then enters the atmosphere after being expanded by the beam expander 6, and the backscattered light produced Return through the beam expander 6 and the quarter-wave plate 5 in turn, wherein the vertically polarized light is reflected by the polarization beam splitter prism 4, and combined with the continuous laser light emitted by the second laser 2 on the beam combiner 7, after combining The light beam is focused on t...

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Abstract

The invention discloses a gas Rayleigh-Brillouin scattering spectral line measuring device and method. A half-wave plate, a polarization beam splitter and a quarter-wave are sequentially arranged between the first laser and the beam expander. A beam combiner and a focusing lens are arranged sequentially between the polarization beam splitter prism and the photon detector; an intermediate frequency filter and an intermediate frequency amplifier are arranged sequentially between the photon detector and the photon counting card; the function signal generator is respectively connected to a photon counting card and an oscilloscope, and the photon counting card is connected to the oscilloscope and the computer respectively. The invention realizes the measurement of high-resolution atmospheric Rayleigh-Brillouin scattering spectral lines and improves the stability of the measurement. It solves the problems of difficult detection of atmospheric backscattering signals, low response rate and low signal-to-noise ratio of spectral lines, and realizes high-efficiency, high-precision and high-stability signal detection.

Description

technical field [0001] The invention relates to gas detection technology, in particular to a measurement device and method for gas Rayleigh-Brillouin scattering spectrum lines. Background technique [0002] Since Brillouin scattering was proposed for ocean monitoring in the 1960s, various researchers have realized the measurement of parameters such as sound velocity, temperature, and water volume viscosity coefficient in seawater through accurate measurement of Brillouin scattering spectrum. The lidar used for atmospheric wind field measurement is based on the Doppler frequency shift of the Rayleigh scattering Gaussian distribution spectrum of atmospheric molecules, ignoring the Brillouin scattering of atmospheric molecules, resulting in a systematic error of 3%-10%. And as early as 1968, some researchers pointed out the necessity of considering Brillouin scattering in atmospheric environment monitoring, so the research on Rayleigh-Brillouin scattering is increasing day by d...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/53G01N21/01
Inventor 吴涛杨传音商景诚何兴道王浩陶俊中
Owner NANCHANG HANGKONG UNIVERSITY
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