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Gain modulation type pulse imaging laser radar system

A lidar and imaging technology, applied in radio wave measurement systems, electromagnetic wave re-radiation, utilization of re-radiation, etc. Effect

Inactive Publication Date: 2008-12-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the instantaneous power of the laser is limited when the target is imaged by using sine wave modulation to seriously affect the imaging quality and measurement range, the present invention provides a gain-modulated pulse imaging laser radar system

Method used

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  • Gain modulation type pulse imaging laser radar system
  • Gain modulation type pulse imaging laser radar system
  • Gain modulation type pulse imaging laser radar system

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specific Embodiment approach 1

[0007] Specific implementation mode one: see figure 1 The gain-modulated pulsed imaging laser radar system of this specific embodiment is composed of an optical transmitting antenna 1, a pulsed laser 2, a control processor 3, an optical receiving antenna 4, an optical filter 5, a high-voltage modulator 6 and an intensity imager 7, The light beam emitted by the pulse laser 2 is shaped by the optical transmitting antenna 1 and irradiated on the target, and the light beam reflected by the target is shaped and converged by the optical receiving antenna 4 and reaches the optical input end of the optical filter 5. The light from the optical filter 5 The light beam output by the output end is incident on the optical input end of the intensity imager 7, and the intensity imager 7 obtains a target intensity image whose intensity value is proportional to the round-trip time of the light pulse, and the output end of the intensity imager 7 is connected to the control processor 3 One image...

specific Embodiment approach 2

[0010] Specific implementation mode two: see figure 1 and figure 2 The difference between this specific embodiment and specific embodiment 1 is: the intensity imager 7 selects a gate-type ICCD imager, and the gate-type ICCD imager includes a photocathode that can be used as a photoelectric conversion element 7-1 7-1-1, grid 7-2-1 that can be used as current regulating element 7-2, voltage adjustable microchannel plate that can be used as electron multiplication element 7-3 7-3-1, can be used as The image intensifier 7-7 formed by the fluorescent screen 7-4-1 of the electro-optic conversion element 7-4, the light beam obtained from the light output end of the optical filter 5 is incident on the photocathode 7-1-1 of the gate-type ICCD imager Above, the output end of the gate-type ICCD imager is connected to an image information input end of the control processor 3, and the monotonously variable modulation signal output end of the high-voltage modulator 6 is connected to the v...

specific Embodiment approach 3

[0012] Specific implementation mode three: see figure 1 The difference between this embodiment and Embodiment 1 is that the imaging laser radar system also includes a beam splitter 8 and a second CCD imager 9, and the light beam obtained from the light output end of the optical filter 5 is split into After the sheet 8 splits the beam, a part of the light beam is incident on the light input end of the intensity imager 7, and another part of the light beam is incident on the light input end of the second CCD imager 9, and the image output end of the second CCD imager 9 communicates with the control processor 3 The other image input terminal is connected. Other compositions and connections are the same as in the first embodiment. This specific embodiment adds a CCD imager, which is used to obtain the image information before the echo pulse enters the intensifier. Compared with the specific embodiment 1, this specific embodiment can be used to simultaneously obtain the above-ment...

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Abstract

The invention relates to a gain modulation impulse imaging laser radar system. The beam emitting from impulse laser of imaging device would irradiate to target after reforming by optical transmitting antenna. Echo impulse would emit to light input end of intension imagine device of target intension image. Monotone alteration modulation signal output end of high voltage modulator connects to the gain modulation signal control end of imaging device. The exposure control end of control processor connects to switch control end of intension imaging device. The invention could effectively improve acceptance range and imaging quantity and decrease the complex degree of system structure.

Description

technical field [0001] The invention relates to the field of laser radar, in particular to a laser radar system which uses an intensity integration device to form a range image of a target. Background technique [0002] At present, a major problem in the field of optoelectronic imaging is how to use a mature intensity-integrating device (such as CCD) to form a distance image of the target. In 1990, Marion W, Scott applied for a patent titled "Range Imaging LiDAR System" at the US Patent Office. This patent is based on the traditional phase ranging principle. In the patent, it is proposed for the first time that the laser and the image intensifier are sinusoidally modulated, the signal output by the image intensifier is coupled to the CCD through the optical fiber and received by the CCD, and the distance image of the target is obtained through the distance processor. However, since the transmitting device in this method also uses continuous wave modulation, the instantaneo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/89
Inventor 孙秀冬赵远靳辰飞张勇张宇刘丽萍唐勐陈锺贤
Owner HARBIN INST OF TECH
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