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Spectral measurement method based on wide-spectrum light source and spectral scanning laser radar

A technology of spectral measurement and broad-spectrum light source, applied in the field of lidar, can solve problems such as inability to work, and achieve the effects of optimizing detection, isolating background noise, and improving system integration and stability

Active Publication Date: 2020-06-09
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of this application is to overcome the above-mentioned defects or problems in the background technology, and provide a spectral measurement method based on a wide-spectrum light source and a spectral scanning laser radar, so as to make up for the current passive remote sensing technology based on sunlight as a light source. The defect that it cannot work in cloudy conditions, so as to realize the water color remote sensing monitoring all day long

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  • Spectral measurement method based on wide-spectrum light source and spectral scanning laser radar
  • Spectral measurement method based on wide-spectrum light source and spectral scanning laser radar
  • Spectral measurement method based on wide-spectrum light source and spectral scanning laser radar

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Embodiment 1

[0066]The technical solution in the first embodiment adopts the active remote sensing technology based on the broad-spectrum light source to make up for the defect that the current passive remote sensing technology based on sunlight as the light source cannot work at night and in cloudy conditions, so as to realize water color remote sensing monitoring throughout the day . In the technical solution of the first embodiment, by adjusting the transmission wavelength of the tunable filter 3 in time division, the echo intensity at different wavelengths can be obtained, so as to realize the measurement of the spectrum. The technical solution in the embodiment adopts time-division multiplexing technology, and through optical switch switching, the broad-spectrum pulsed laser and the echo signal pass through the same adjustable filter 3 in time-division, so that only a single laser, a single filter, a single detector and The single-channel acquisition card realizes spectral extraction,...

Embodiment 2

[0068] see figure 2 , figure 2 The scanning lidar in the second embodiment is shown. Such as figure 2 As shown, the difference between the second embodiment and the first embodiment is mainly that a delay fiber 10 is added between the transmitting and receiving module 6 and the amplifier 5 (of course, a delay fiber 10 can also be added between the second optical switch 4 and the amplifier 5 10), and the internal structure of the transmitting and receiving module 6 is different.

[0069] By adding the delay fiber 10 , the echo signal can be separated from the broad-spectrum pulsed laser in the time domain, which is more convenient for measurement, and can also reduce the switching frequency requirements of the first optical switch 2 and the second optical switch 4 .

[0070] In the second embodiment, the transmitting and receiving module 6 adopts a coaxial transmitting and receiving structure, which includes a circulator 63 and a transmitting and receiving telescope 64 . ...

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Abstract

The invention discloses a spectral measurement method based on a wide-spectrum light source and spectral scanning laser radar. The measurement method comprises the following steps: adjusting the transmission wavelength of the adjustable filter in a time-sharing manner; under a specific transmission wavelength, filtering laser pulses from the wide-spectrum pulse laser through an adjustable filter,emitting the wide-spectrum pulse laser to a detection target after being subjected to pulse excitation amplification, filtering echo signals through the same adjustable filter to obtain signals to bedetected, and measuring echo intensity of the signals to be detected; and measuring echo intensities under different transmission wavelengths to obtain a detection target spectrum. The related spectrum scanning laser radar adopts a time division multiplexing technology and an optical switch gating technology to support the implementation of the method. According to the invention, the solar and skybackground noise can be filtered to the greatest extent, the Brillouin signal, the Raman signal and the resonance fluorescence signal are isolated, the detection spectrum purity and the signal-to-noise ratio are improved, and the system integration and stability are improved by adopting an all-fiber structure. Spectral signals of an underwater profile can be extracted, and the method is an important supplement based on passive water color remote sensing at present.

Description

technical field [0001] The present application relates to the field of laser radar, in particular to a spectral measurement method based on a wide-spectrum light source and a spectral scanning laser radar. Background technique [0002] Water color measurement and analysis is an important link in earth observation. Since phytoplankton, suspended sediment and dissolved matter can absorb and / or scatter natural light from the solar system, especially in the visible wavelength range, they can have a profound impact on the underwater light field and the upward radiance spectrum across the water-air interface. influences. The intensity of this radiance and its variation with wavelength can be measured by a radiometer or similar instrument. Therefore, by analyzing the changes in this spectrum, the components in water and underwater can be perceived, and "water colorology" is derived from this. The research results of hydrochromology have revolutionized the field of biological oce...

Claims

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Application Information

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IPC IPC(8): G01S7/481G01S17/88
CPCG01S7/481G01S17/88
Inventor 上官明佳李忠平商少凌
Owner XIAMEN UNIV
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