Method for measuring ocean inherent optical parameter by using laser radar system

A lidar and system measurement technology, applied in the measurement of color/spectral characteristics, measurement devices, and use of re-radiation, etc., can solve problems such as large errors, cumbersome measurement methods, and inability to achieve large-scale measurement, and achieve high spectral resolution characteristics, The effect of extending the detection range

Inactive Publication Date: 2017-03-22
LUDONG UNIVERSITY
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, the measurement of ocean optical parameters generally uses instruments such as hyperspectral absorption attenuation measuring instrument or hyperspectral backscattering instrument to realize on-site measurement. A large number of statistical regressions are used to calculate the ocean optics parameters, and the error is large

Method used

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  • Method for measuring ocean inherent optical parameter by using laser radar system
  • Method for measuring ocean inherent optical parameter by using laser radar system
  • Method for measuring ocean inherent optical parameter by using laser radar system

Examples

Experimental program
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Embodiment 1

[0025] In the embodiment of the present invention, the present invention is mainly expressed from aspects such as the composition of the laser radar system, the measurement principle, and the inversion of inherent ocean optical parameters.

[0026] 1) LiDAR system composition

[0027] The laser radar is equipped with a space mobile platform, the laser is downward observation, the laser emission system uses 532nm wavelength output, the seed injection realizes the narrow line width, the temperature tuning realizes the frequency adjustment, and the telescope is used for signal reception. According to the ratio of 1:1, it is divided into two channels, one is used as a reference channel, and the other is used as a measurement channel through an iodine molecular absorption filter. The two optical signals pass through a photodetector to realize photoelectric conversion, and are input to the processing system through a signal acquisition system. Such as figure 1 shown.

[0028] 2) M...

specific Embodiment

[0038] Specific examples are as follows.

[0039] Use seeds to inject 532nm laser wavelength, and adjust the laser output frequency to the center of the valley bottom of the iodine molecular absorption curve. The receiving system adopts a dual-channel design to realize the measurement of the backscattering signal of sea water. One is to detect the scattering from suspended matter and water molecules. The total energy P 1 (r), the other is the scattered signal energy P after passing through the iodine molecular absorption filter 2(r), after the backscattering signal of seawater passes through the iodine molecular absorption filter, because the iodine molecular filter has a high absorption ratio for the narrow linewidth signal, the backscattering signal of the suspended matter in the seawater is completely filtered out, and the remaining The following all come from the scattering signals of water molecules. The seawater backscattering ratio R(r) can be obtained through the inte...

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Abstract

The invention discloses a method for measuring an ocean inherent optical parameter by using a laser radar system. 532nm wavelength output is employed by the laser emitting system in the laser radar system, a receiving system is used to carry out signal receiving, received atmosphere and ocean scattering signals are divided into two paths according to 1:1 in a receiving system, one path is used as a reference channel, the other path goes through an iodine molecule absorption filter as a measurement channel. The photoelectric conversion of two paths of optical signals is realized through a photoelectric detector, and the signals are inputted to a processing system for processing computing via a signal collection system. According to the method, the iodine molecule absorption filter is used, the back scattering signal spectrum of a laser sea water body is considered, the separate measurement of the narrow linewidth suspended matter scattering and broadband water molecule scattering is realized, the spectral resolution characteristic is high, and the detection range of ocean information by the laser radar system is expanded.

Description

technical field [0001] The invention relates to the field of laser application science and technology, in particular to a method for measuring inherent optical parameters of the ocean by using a laser radar system. Background technique [0002] The ocean optical parameters of the ocean subsurface can improve the sea color retrieval model, which is of great significance to the study of global change and carbon cycle. Inversion model to improve inversion accuracy. At present, the measurement of ocean optical parameters generally uses instruments such as hyperspectral absorption attenuation measuring instrument or hyperspectral backscattering instrument to realize on-site measurement. A large number of statistical regressions are used to estimate the ocean optics parameters, and the errors are relatively large. [0003] The development of laser radar has realized laser measurement of atmospheric aerosol distribution, wind profile, temperature profile, etc., as well as the mea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/88G01N21/39
CPCG01S17/88G01N21/39
Inventor 李志刚刘智深
Owner LUDONG UNIVERSITY
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