Laser radar set with high spectral resolution

A laser radar, resolution technology, applied in the direction of measurement device, electromagnetic wave re-radiation, utilization of re-radiation, etc., can solve the problems of poor signal-to-noise ratio, poor signal-to-noise ratio of ordinary visible light, and few applications

Active Publication Date: 2013-09-18
ZHEJIANG UNIV
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Problems solved by technology

Therefore, the current high spectral resolution lidar based on the Fabry-Perot interferometer filter is mainly used in the short-wavelength region of the ultraviolet and near-ultraviolet. In ordinary visible light, the signal-to-noise ratio is very poor, so it is rarely used, and in the longer waveband Due to the poor signal-to-noise ratio in the near-infrared region, it has not been reported yet

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  • Laser radar set with high spectral resolution
  • Laser radar set with high spectral resolution
  • Laser radar set with high spectral resolution

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Embodiment

[0028] After the frequency locking system 15 locks the frequency of the Michelson interferometer filter 11 based on field of view widening to the single-frequency polarized pulse laser 1, the beam emitted by the single-frequency polarized pulse laser 1 is expanded by the beam expander 2 and then passes through the mirror a 3 and reflector b 4 are emitted into the atmosphere to be detected; they are scattered by atmospheric molecules and aerosol particles to generate lidar echo signals. After the laser radar echo signal is collected by the telescope 5, the background radiation of the sky is filtered out by the optical filter 6, and then split by the beam splitter 7, one signal is reflected into the photodetector a8, and the other signal is transmitted to the polarization beam splitter b9 for splitting. The S-polarized signal is reflected into the photodetector b10, and the P-polarized signal is transmitted to the Michelson interferometer filter 11 based on field-of-view widening...

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Abstract

The invention discloses a laser radar set with high spectral resolution. After a frequency locking system frequency-locks an expanded-field-based Michelson interferometer filter to a single-frequency polarized pulse laser, beams emitted by the single-frequency polarized pulse laser are reflected to detected atmosphere by reflectors a and b after passing a beam expander; after the beams are scattered by atmospheric molecules and aerosol particles, laser radar echo signals are generated; the laser radar echo signals are collected by a telescope; after sky background radiation is filtered by an optical filter, the signals are split by a beam splitter; one signal is reflected into a photoelectric detector a, and the other signal penetrates a polarizing splitter prism b before being divided into two; S-polarized signals are reflected into a photoelectric detector b, and P-polarized signals penetrate a high spectra resolution filer; the P-polarized signals passes the expanded-field-based Michelson interferometer filter to be received by a photoelectric detector c. The laser radar set with high spectral resolution is free of wavelength limitation, has large visual angle and is highly capable of searching laser radar echo signals.

Description

Technical field [0001] The invention is a laser radar technology field, especially involving a high -spectrum resolution laser radar device. Background technique [0002] In the atmospheric detection, the laser radar receives the atmosphere of the scattering light, which contains the Ruili loose scattering signal with a wide atmospheric molecule and the rice loose scattering signal of the width and narrow air -soluble glue particles.Because Ryli scattering and rice scattering are elastic scattering, their central spectral spectra and laser radar are overlapped.High spectrometer resolution laser radar uses air -soluble gel scattered spectrum width different from the characteristics of other scattered spectrum. Through the high -spectrum resolution filter, it is separated from the atmospheric scattering and the Ruili scattering spectrum is separated from the atmospheric scattering.A filter with high spectrometer resolution is one of the core technologies of high -spectrum resolutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/95G01S7/481
CPCY02A90/10
Inventor 刘东杨甬英成中涛
Owner ZHEJIANG UNIV
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