MULTI-CHANNEL RAMAN LIDAR RECEIVING OPTICAL SYSTEM FOR THE MEASUREMENT OF A WATER PHASE AND NUMBER DENSITY AND METHOD FOR ACQUIRING SIGNAL

摘要

A multi-channel Raman lidar receiving optics for measuring phase change and density of water and a method for obtaining signal are provided to obtain only a Raman scattering signal of a desired wavelength by adjusting the angle of diffraction plates of double spectrometer. A multi-channel Raman lidar receiving optics comprises a first spectrometer and a second spectrometer. Light incident through an optical fiber(201) passes through a first slit(205) of the first spectrometer and is reflected. The second spectrometer allows the light passed through the first slit to pass through a second slit(206) selectively according to the wavelength and then reflects the light. The second spectrometer determines the wavelength so that the light passed through the second slit becomes a Raman scattering signal of which an elastic scattering signal has been removed.