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Device and method for locking resonant frequency of Michelson interference type spectral filter

A Michelson-type, spectral filter technology, applied in the direction of measuring devices, instruments, electromagnetic wave re-radiation, etc., can solve the problems of complex equipment, increasing the complexity of circuits and optical devices, etc.

Active Publication Date: 2016-08-17
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this technology is widely used, the disadvantage is that the required equipment is very complicated
These increase the complexity of the technology's circuitry and optics

Method used

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  • Device and method for locking resonant frequency of Michelson interference type spectral filter
  • Device and method for locking resonant frequency of Michelson interference type spectral filter
  • Device and method for locking resonant frequency of Michelson interference type spectral filter

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Experimental program
Comparison scheme
Effect test

Embodiment

[0075] figure 1 The middle laser 1 and the laser radar transmitter are shared by means of light splitting, and its frequency is the reference frequency that needs to be locked;

[0076] The above-mentioned collimating beam expander 2 can be an ordinary beam expander, such as the GCO-141602 beam expander of Beijing Daheng Company, which has a 6-fold beam expander;

[0077] The above-mentioned first beam splitter 3 adopts a beam splitter of T: R=10%:90%, such as GCC-411215 of Beijing Daheng Company; the second beam splitter 6 uses a common T:R=50%:50% beam splitter Yes, such as GCC-411102 of Beijing Daheng Company;

[0078] Above: the first reflector 4, the second reflector 5, and the third reflector 7 can be ordinary reflectors, such as GCC-101102 of Beijing Daheng Company, with a diameter of 25.4mm;

[0079] Lens 11 is a long focal length lens, such as Beijing Daheng Company GCL-010214, focal length 400mm;

[0080] The first photomultiplier tube (PMT) 12, the second photomu...

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Abstract

The invention discloses a resonant frequency locking device and a resonant frequency locking method for a Michelson interference type spectrum filter. The device comprises a laser beam splitting system, a Michelson interference type spectrum filter system and a photoelectric detection system; the laser beam splitting system comprises a laser device, a collimation and beam expander, a first spectroscope, a first reflector, a second reflector, a second spectroscope and a third reflector; the Michelson interference type spectrum filter system comprises a cubic beam splitter prism, a fourth reflector and a fifth reflector; and the photoelectric detection system comprises a lens, a first photomultiplier, a second photomultiplier, a third photomultiplier, a differential amplifier and an oscilloscope. The method comprises the following specific steps: firstly, calculating the incident angles of the two probe light beams; secondly, adjusting the incident angles of the two probe light beams; and thirdly, examining the oscilloscope to judge a frequency locking state. The method and the device can be realized simply, and the complicate requirements of a traditional frequency locking method on circuits and light paths can be prevented, so that the device has stronger system stability and robustness.

Description

technical field [0001] The invention belongs to the technical field of laser radar, and in particular relates to a resonant frequency locking device and method of a Michelson interference type spectral filter. Background technique [0002] Due to the use of spectral filtering technology, high spectral resolution lidar solves the problem that traditional backscatter lidar needs many prior assumptions to invert atmospheric parameters, thus improving the accuracy of atmospheric remote sensing. In high spectral resolution lidar, the use of spectral filters is an extremely critical technology. Through the high spectral resolution capability of the spectral filter, the components scattered by atmospheric aerosols and components scattered by atmospheric molecules in the atmospheric backscattering spectrum can be separated, so that more details of the atmospheric backscattering spectrum can be obtained. Combined with relevant remote sensing principles, atmospheric optical propertie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/481
CPCG01S7/4816G01S17/95
Inventor 刘东杨甬英成中涛
Owner ZHEJIANG UNIV
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