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Composite speckle field coherent imaging method and device for inhibiting atmospheric turbulence effect

An atmospheric turbulence and coherent imaging technology, which is applied to measurement devices, electromagnetic wave re-radiation, and utilization of re-radiation, etc., can solve the problem of inability to obtain target depth information, laser frequency drift and insufficient correction effect, and inability to dynamically transmit target spatial spectrum information. and other problems, to achieve the effect of suppressing random drift and improving the efficiency of long-distance transmission

Pending Publication Date: 2020-06-30
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems existing in the prior art that the speckle echo information does not change with time, which leads to the inability to dynamically transmit the target spatial spectrum information, the laser frequency drift after beam splitting and the correction effect is insufficient, and the depth information of the target cannot be obtained , and provide a compound speckle field coherent imaging method and device for suppressing the effect of atmospheric turbulence

Method used

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  • Composite speckle field coherent imaging method and device for inhibiting atmospheric turbulence effect
  • Composite speckle field coherent imaging method and device for inhibiting atmospheric turbulence effect
  • Composite speckle field coherent imaging method and device for inhibiting atmospheric turbulence effect

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Embodiment 1

[0057] The present invention suppresses the compound speckle field coherent imaging device of atmospheric turbulence effect, such as figure 1 As shown, it includes a laser emission system, a signal recovery system and a computer 12;

[0058] The laser emission system includes a modulator 1.2, a laser source 1.1, a beam splitter 2, a frequency shifter 3, an optical fiber installation platform 5, a collimator 6 and an L-shaped shearing platform 7;

[0059] Laser source 1.1: fiber laser with a wavelength of 1064nm, the output laser is a high-power, narrow-linewidth, single-mode polarization-maintaining laser, which is easy to generate interference information on the target surface, and the output power is adjustable;

[0060] Modulator 1.2: responsible for completing the micro-wavelength modulation of the laser source to ensure the dual-wavelength output of the system to complete the reconstruction of target depth information;

[0061] Beam splitter 2, frequency shifter 3, colli...

Embodiment 2

[0084] The compound speckle field coherent two-dimensional imaging method for suppressing atmospheric turbulence effect of the present invention is specifically implemented according to the following steps:

[0085] Step 1) Generate laser light with a set wavelength and divide it into three homologous beams;

[0086] Step 2) Using an acousto-optic frequency shifter to generate a slight frequency difference between two pairs of the three homologous beams, and the frequency differences between the two homologous three beams are different;

[0087] Step 3) The three beams of the same source are in an L-shaped layout on the emission plane, where the O light is the reference light, the X light is the horizontal shear light, the Y light is the vertical shear light, and the distance between the X light and the O light is horizontal Shear S x , the distance between Y light and O light is the longitudinal shear amount S y ;Transverse shear amount S x and longitudinal shear amount S ...

Embodiment 3

[0094] The present invention suppresses the composite speckle field coherent three-dimensional imaging method of atmospheric turbulence effect, such as Figure 6 As shown, the specific steps are as follows:

[0095] Step 1) sequentially generating at least two sets of lasers with different set wavelengths, and dividing each set of lasers into three homologous beams;

[0096] Step 2) Using an acousto-optic frequency shifter to make a small frequency difference between two pairs of the three homologous beams in each group, and the frequency difference between the two homologous three beams is different;

[0097] Step 3) Make the three beams of the same source in an L-shaped layout on the emission plane, wherein the O light is the reference light, the X light is the horizontal shear light, and the Y light is the vertical shear light. The distance between the X light and the O light is Transverse shear amount S x , the distance between Y light and O light is the longitudinal she...

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Abstract

The invention relates to a composite speckle field coherent imaging method and device for inhibiting an atmospheric turbulence effect. The objective of the invention is to solve the problems of incapability of dynamically transmitting target spatial spectrum information, laser frequency drift after beam splitting, insufficient correction effect and incapability of obtaining depth information of atarget due to the fact that speckle echo information does not change with time in the prior art. The invention provides a composite speckle field coherent two-dimensional imaging method for inhibitingthe atmospheric turbulence effect, further provides a composite speckle field coherent three-dimensional imaging method for inhibiting the atmospheric turbulence effect, and further provides a composite speckle field coherent imaging device for inhibiting the atmospheric turbulence effect based on the two imaging methods. According to the invention, a mode of combining homologous laser beam groupshearing and acousto-optic frequency shift modulation is adopted to illuminate a target, so that a coherent composite speckle field which has a certain shearing amount and changes along with time isformed on the surface of the target, and the transmitting mode improves the remote transmission efficiency of a target echo signal.

Description

technical field [0001] The invention relates to a composite speckle field coherent imaging method and device for suppressing atmospheric turbulence effects. Background technique [0002] The existing composite speckle field coherent imaging that suppresses the effect of atmospheric turbulence mostly adopts the collection of the spatial information of the speckle field and the image processing of the interference information, without adding modulation in the time domain, and the speckle echo information does not change with time. For the more dynamic speckle echo, the requirements for remote imaging conditions are more stringent, and the spatial spectrum information of the target cannot be dynamically transmitted. For the frequency drift phenomenon in the multi-beam emission system, the laser frequency stabilization technology often used is to stabilize the frequency of the light source before beam splitting, and for the independent random frequency drift after the split beam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/89
CPCG01S17/89
Inventor 张羽刘辉李长春陈明徕罗秀娟
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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