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Lidar device for three-dimensional detection of targets

A laser radar and target technology, which is used in measuring devices, using re-radiation, and electromagnetic wave re-radiation.

Active Publication Date: 2019-05-17
DENSO WAVE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that the detection range is limited to the plane range
In particular, the laser beam reflected by the concave mirror is forced to scan a given plane (scanning plane), so that the area outside the scanning plane cannot be scanned
That is, if the target moves away from the scan plane, the target cannot be detected
In addition, even when the target exists in the scanning plane, the existence of the target cannot be grasped in three dimensions

Method used

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  • Lidar device for three-dimensional detection of targets
  • Lidar device for three-dimensional detection of targets
  • Lidar device for three-dimensional detection of targets

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0053] The following will refer to figure 1 and 2 A laser radar device 1 according to a first embodiment of the present invention will be described.

[0054] figure 1 The configuration of the laser radar device 1 according to the first embodiment has been outlined.

[0055] Such as figure 1 As shown, the lidar device 1 is equipped with a housing 3 configured to detect the distance to the target and the direction of the target. In the housing 3, a laser diode 10 and a photodiode 20 that receives reflected light L2 from an object to be measured are mounted. The laser diode 10 serves as an example of a laser beam generator, and is configured to emit a pulsed laser beam L1 in response to a pulse current supplied from a not-shown driving circuit. The photodiode 20 serves as an example of a photodetector, and is configured to detect reflected light L2 of the laser beam L1 , which is reflected by a target to be detected, and convert the reflected light L2 into an electrical sign...

no. 2 example

[0080] refer to image 3 , a laser radar device according to a second embodiment of the present invention will be described below.

[0081] In the second embodiment and subsequent embodiments, components similar or equivalent to the components in the first embodiment will be given the same reference numerals as those explained in the first embodiment for convenience of description.

[0082] The second embodiment involves a geometrical modification of the laser diode 10 and the photodiode 20 .

[0083] image 3 A schematic configuration of a laser radar device 100 according to the second embodiment is shown, in which a reflection mirror 130 is mounted as described later. The XYZ orthogonal coordinate system is set to image 3 The configuration shown is such that the X-axis and Y-axis directions are designated as the reflection direction at the mirror 130 (i.e., the light receiving direction at the photodiode 20) and the direction of the center axis 42a of the rotary deflecti...

no. 3 example

[0092] refer to Figure 4 , a laser radar device according to a third embodiment of the present invention will be described below.

[0093] The third embodiment involves a geometrical modification of the laser diode 10 and the photodiode 20 .

[0094] Figure 4 A schematic configuration of a laser radar device 200 according to the third embodiment is shown, in which a rotation deflection mechanism 240 having a center shaft 242a is mounted, as will be described later. The XYZ orthogonal coordinate system is set to Figure 4 The configuration shown is such that the X-axis and Y-axis directions are assigned to the emission direction of the laser beam L1 from the laser diode 10 and the direction of the central axis 242a of the rotation deflection member 240, respectively.

[0095] In this laser radar device 200 , a laser diode 10 and a photodiode 20 are mounted as in the first embodiment.

[0096] The present laser radar device 200 is different from the laser radar device 1 ac...

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Abstract

PROBLEM TO BE SOLVED: To provide a laser radar apparatus that allows detection over the periphery of the apparatus and also allows three-dimensional detection.SOLUTION: A laser radar apparatus 1 comprises: a laser diode 10 for generating a laser beam; a photodiode 20 for detecting reflected light of the laser beam that is reflected by a detecting object when the laser beam is generated from the laser diode 10; a deflecting section 41 constituted so as to be rotatable about a predetermined center axis 42a; a rotation deflecting mechanism 40 for deflecting the laser beam toward space with the deflecting section 41 and deflecting the reflected light toward the photodiode 20; and a motor 50 for rotating and driving the rotation deflecting mechanism 40. The laser radar apparatus 1 further comprises: a rocking mirror 31 for changing a direction of the laser beam from the deflecting section 41 with respect to a direction of the center axis 42a by relatively changing an incidence direction of the laser beam to the deflecting section 41; and controlling means for controlling the rocking mirror 31.

Description

[0001] This application is a divisional application of the invention patent application with the application date of February 28, 2008, the name "Lidar device for three-dimensional target detection", and the application number 200810092043.1. technical field [0002] The present invention relates to a laser radar device, and more particularly to a laser radar device that uses a laser beam to detect the distance and direction of an object to be measured. Background technique [0003] Japanese Patent Publication No. JP2789741 discloses a conventional laser radar device. The device disclosed by this publication is equipped with a laser beam generator, a detector and an optical isolator through which the laser beam is transmitted. The laser beam generator generates a laser beam, and the optical isolator is positioned on the optical axis of the laser beam from the generator to reflect reflected light toward a detector, which detects reflected light from an object to be measured. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/06
CPCG01S7/4817
Inventor 田中秀幸冈田匡宪鸿巢光司野尻忠雄伊藤邦彦水越宏明吉田贤一
Owner DENSO WAVE INC
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