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Ambient light noise suppression circuit and laser radar

A noise suppression and ambient light technology, applied in the re-radiation of electromagnetic waves, radio wave measurement systems, and the use of re-radiation, etc., can solve the problem of inaccurate distance data of lidar, and achieve the effect of improving the ability to resist ambient light noise

Pending Publication Date: 2018-03-02
BENEWAKE BEIJING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to propose a kind of ambient light noise suppressing circuit, through the setting of noise circuit, filtering circuit, solved the problem of the lidar range data error caused by ambient light noise, improved the ability of lidar anti-environmental light, and Will not affect the received signal quality of lidar

Method used

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  • Ambient light noise suppression circuit and laser radar
  • Ambient light noise suppression circuit and laser radar

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Effect test

Embodiment 1

[0032] This embodiment provides an ambient light noise suppression circuit, such as figure 1 As shown, it includes: a noise detection circuit forming a closed loop, a filter circuit, a high voltage module 4 and a photoelectric sensor 5, the photoelectric sensor 5 is respectively connected to the noise detection circuit and the high voltage module 4, and the filter circuit is connected to the noise detection circuit and the high voltage Between the modules 4, according to the comparison result of the noise detection circuit between the ambient light noise electrical signal and the set threshold level, the filter circuit adjusts the input voltage of the photoelectric sensor 5 to adjust the sensitivity of the photoelectric sensor 5 accordingly. The sensitivity of the photoelectric sensor 5 changes positively with the change of the input voltage.

[0033] An amplifier 6 for amplifying electrical signals is also connected between the photoelectric sensor 5 and the noise detection c...

Embodiment 2

[0055] The difference from Embodiment 1 is that the noise detection circuit includes a monostable circuit connected to the photoelectric sensor, and a second capacitor and a voltage divider circuit connected in series at the input end of the monostable circuit, and the second capacitor is used to The noise electrical signal is coupled with the set threshold voltage input by the voltage divider circuit, the noise electrical signal is coupled with the set threshold level and then input into the monostable circuit, and the monostable circuit corresponds to the coupled electrical signal exceeding The threshold level output of the monostable circuit is set to a high level of the pulse width, and the corresponding coupled electrical signal is lower than the threshold level of the monostable circuit to output a low level.

[0056]When the noise electrical signal continues to exceed the set threshold level, when the monostable circuit continues to output a high level with a set pulse w...

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Abstract

The present invention relates to the optical range finding technology field, in particular to an ambient light noise suppression circuit and a laser radar. The ambient light noise suppression circuitcomprises a noise detection circuit, a filtering circuit, a high-voltage module and a photoelectric sensor which form a closed loop, the photoelectric sensor is connected with the noise detection circuit and the high-voltage module separately, and the filtering circuit is connected between the noise detection circuit and the high-voltage module. According to a result of the noise detection circuitof comparing an ambient light noise electric signal and a set threshold level, the filtering circuit adjusts an input voltage of the photoelectric sensor, thereby adjusting the sensitivity of the photoelectric sensor correspondingly. The present invention also provides the laser radar having the ambient light noise suppression circuit. According to the present invention, the problem in the priorart that an ambient light suppression circuit only adopts the filtering circuit to eliminate the ambient light noise, and limits the response width of a reception signal of the laser radar, so that the laser radar distance data is wrong is solved.

Description

technical field [0001] The invention relates to the technical field of optical ranging, in particular to an ambient light noise suppression circuit and a laser radar. Background technique [0002] The optical scanning ranging device is a device that uses collimated light beams to perform non-contact scanning ranging through time of flight (TOF for short), triangulation and other methods. At present, a common optical scanning distance measuring device includes: a light emitting module, an optical lens, a light receiving module and a light receiving lens. The light emitting module emits a light beam, and the light receiving lens is located on the optical path of the light emitting module. After the collimated light beam is emitted to the surface of the measured object, it is reflected to the light receiving module, and the light receiving module transmits to the receiving space through measurement. The time, phase difference, and known speed of light can be used to calculate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/495G01S17/08
CPCG01S7/495G01S17/08
Inventor 张海武郑凯疏达李远
Owner BENEWAKE BEIJING TECH CO LTD