Measuring device and method for Rayleigh-Brillouin scattering spectrum of gases

• Main Authors: TAO JUNZHONG, YANG CHUANYIN, WU TAO, SHANG JINGCHENG, WANG HAO, HE XINGDAO
• Format: Patent
• Language: Chinese; English
• Published: 28.06.2019
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses a measuring device and a method for Rayleigh-Brillouin scattering spectrum of gases. A half-wave plate, a polarized beam splitter and a quarter-wave plate are sequentially arranged between a first laser and a beam expander; a beam combiner and a focusing lens are sequentially arranged between the polarized beam splitter and a photon detector; an IF (intermediate frequency)wave filter and an IF amplifier are sequentially arranged between the photon detector and a photon counting card; a functional signal generator is respectively connected with the photon counting cardand an oscilloscope, and the photon counting card is respectively connected with the oscilloscope and a calculator. The device realizes measurement of high-resolution Rayleigh-Brillouin scattering spectrum of gases, and improves measuring stability. The device solves the problems of difficult detection for atmospheric backscattering signals, low response rate and low spectral line signal-to-noiseratio, and realizes high ef