A Water Body Brillouin Scattering and Elastic Scattering LiDAR Based on Virtual Image Phased Array
A virtual image phase array and Brillouin scattering technology, which is applied in the re-radiation of electromagnetic waves, the use of re-radiation, and measurement devices, can solve the problems that elastic scattering and Brillouin scattering cannot be measured at the same time
Active Publication Date: 2018-08-17
OCEAN UNIV OF CHINA
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This method is suitable for lidar, but it cannot measure elastic scattering and Brillouin scattering at the same time, and requires the wavelength of the laser to strictly match the characteristics of the filter
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[0016] The purpose of the present invention is to provide a water body Brillouin scattering and elastic scattering laser radar based on a virtual image phase array, so as to solve the technical problems in related fields.
[0017] The optical filter based on the virtual image phase array of the present invention such as figure 1 shown. The parallel light (1) is incident into the virtual image phase array (3) after being focused by the cylindrical lens (2). The output of the virtual image phase array (3) is coupled into the matching diffraction grating (5) after passing through the auxiliary optical lens (4). According to the actual situation, the auxiliary optical lens (4) can also not be added. The diffraction grating (5) can be a transmission type or a reflection type, and can also be a concave grating or a plane grating. Two-dimensional spatially arranged spectral interference fringes are obtained at the focal plane (6) of the diffraction grating, where the virtual image...
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The invention relates to a virtually imaged phased array-based water body Brillouin scattering and elastic scattering lidar. The virtually imaged phased array-based water body brillouin scattering and elastic scattering lidar is composed of a narrow linewidth laser, a laser frequency stabilization system, an optical transmitting system, an optical receiving system, a virtually imaged phased array-based narrow-band optical filter, a multichannel photoelectric detection system and a data acquisition and processing system. The virtually imaged phased array-based narrow-band optical filter is composed of a virtually imaged phased array and a diffraction grating; the output of the virtually imaged phased array-based narrow-band optical filter is spectra interference fringes in two-dimensional spatial arrangement; and the virtually imaged phased array-based narrow-band optical filter can directly separate Mie scattering in water, Rayleigh scattering of water body molecules and water body Brillouin scattering of a water body. The virtually imaged phased array-based water body Brillouin scattering and elastic scattering lidar can be utilized to directly measure the elastic scattering and Brillouin scattering of the water body and obtain corresponding high-accuracy parameters.
Description
technical field [0001] The invention relates to a water body Brillouin scattering and elastic scattering laser radar based on a virtual image phase array, and more specifically belongs to a kind of water body Brillouin scattering and elastic scattering laser radar with a virtual image phase array as a narrow-band optical filter. lidar. Background technique [0002] When the laser is incident on the water body, it will cause Brillouin scattering of the water body while causing elastic scattering. Elastic scattering of water body mainly includes Rayleigh scattering of water body, Mie scattering of suspended particles in water, etc. The wavelength of the elastic scattering is the same as the laser wavelength of the incident light. The Rayleigh scattering linewidth of the water body is about 1 GHz, and the meter scattering linewidth of the particles in the water is basically the same as the laser linewidth. The Brillouin scattering of water is caused by the interaction of inc...
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IPC IPC(8): G01S17/88
CPCG01S17/88
Inventor 刘金涛刘秉义宋小全张凯临吴松华
Owner OCEAN UNIV OF CHINA