Research On Spontaneous Rayleigh-brillouin Scattering Spectra Of Gas At Different Pressures

The ranged environment of atmosphere influences our survival condition of allearth. Pressure and temperature are very important in atmosphere,they are needed to bemonitored in time. we can make use of the technology of Brillouin to measure manyparameters, such as temperature, pressure,and density distribution of gases.In our paperthe spontaneous Rayleigh-Brillouin scattering’characteristic is investigated, pressureand temperature can be calculated through the Rayleigh–Brillouin scattering feature inorder to provide monitored and high-accuracy technology for atmospheric lidar andmartial monitor.The ranged pressure of gas makes a great influence on Rayleigh-Brillouinscattering’characteristic, in the paper we mainly measure the direction of90’sspontaneous Rayleigh-Brillouin scattering of N2. First we introduce the basic theory ofBrillouin,the importance is different pressures,second the device of whole experimentis recommended,incluing laser, Fabry-Perot etalon, and properties of detector. At lengthwe make analysis of the collection and alignment of experimental light path.In ourlaboratory we can change the pressure of gas to get the spontaneous Rayleigh-Brillouinfrequency spectrum.Finally some questiones of experiment are discussed, someprocedures are suggested：guarantee the scattered cell to clean up stray light;Howeverthe use of gas is pured,experiment can be performed in dustfree environment,or largegranular particles will have Mie scattering disturb the result of experiment；the laserneeds the device to stabilize the frequency.In the paper we get the initial results and detect the frequency spectrum differentpressures （1000mbar,2000mbar,3000mbar,4000mbar,5000mbar,6000mbar）ofN₂,simply we analyse the spectrum of differtent pressures. This will give a new methodto measure the gas’pressure in some environment.