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Bispectrum laser imaging device for extremely weak signals

A laser imaging, weak signal technology, applied in measurement devices, re-radiation of electromagnetic waves, instruments, etc., can solve the problems of insufficient pulse energy, insufficient detection sensitivity, etc., without technical complexity, taking into account high-precision fine sampling and high The effect of signal to noise

Active Publication Date: 2020-09-11
BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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Problems solved by technology

[0006] The technical problem solved by the present invention is to overcome the deficiencies of the prior art, provide a device and method for dual-band laser imaging for extremely weak signals, and solve the problems of insufficient pulse energy, insufficient detection sensitivity, and integration time of traditional laser imaging methods.

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  • Bispectrum laser imaging device for extremely weak signals
  • Bispectrum laser imaging device for extremely weak signals
  • Bispectrum laser imaging device for extremely weak signals

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Embodiment Construction

[0031]The present invention is a dual-band laser imaging device for extremely weak signals, comprising: a dual-spectrum pulsed laser emitting system, a light shield, an optical receiving system, a relay optical component, and an array detection component (E1, E2, E3, E4) , Multi-channel high-speed counting unit (F1, F2), integrated control and data processing unit (G).

[0032] The dual-spectrum pulsed laser emitting system emits two beams of pulsed laser beams with different spectral bands at a certain repetition rate to irradiate the target, and the backscattered dual-spectrum laser signal generated is received by the optical receiving system after passing through the hood. The laser signals of different spectral bands include 532nm and 1064nm laser signals. The laser irradiation target means that the laser spot size at the target is larger than the target size, and the laser spot can cover the target;

[0033] The optical receiving system is located at the rear end of the h...

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Abstract

The invention discloses a bispectrum laser imaging device for extremely weak signals. The bispectrum laser imaging device comprises a bispectrum pulse laser transmitting system, a light shield, an optical receiving system, a spatial light modulator assembly, a relay optical assembly, an array detection assembly, a multi-channel high-speed signal acquisition unit and a comprehensive control and data processing unit. The bispectral pulse laser emission system emits two beams of laser with different wavelengths to irradiate a target. The generated back scattering signals are converged to a primary image plane where the spatial modulator is located through the optical receiving system; through spatial modulation, a laser signal is reflected to the relay optical assembly; the array detection assembly detects laser signals of two wavelengths, the multi-channel high-speed signal acquisition unit acquires and records the signals, and finally the comprehensive control and data processing unit completes calculation imaging based on the compressed sensing theory and reconstructs three-dimensional images of two wavelengths of a target at the same time.

Description

technical field [0001] The invention relates to the technical field of laser three-dimensional imaging, in particular to a dual-band laser imaging device for extremely weak signals. [0002] technical background [0003] Traditional laser 3D imaging mainly has two methods: point scanning method and large area array flash imaging method. The point scanning method, through the cooperation of the laser scanning mechanism and the single point detector, scans the target point by point with the laser spot, and its resolution is related to the size of the laser spot. In point scanning mode, it takes a certain amount of scanning time to perform laser three-dimensional imaging on the target, which is not suitable for moving targets; at the same time, due to the diffraction of light, the spot irradiated on the target will be larger than the target itself, and it is impossible to detect the long-distance target. for imaging. The large area array flash imaging method uses a large area ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/89G01S7/481G01S7/4863
CPCG01S17/89G01S7/481G01S7/4816G01S7/4863Y02A90/10
Inventor 张景豪赵思思苏云张文昱孙倩郑永超
Owner BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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