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A kind of laser ranging method and device based on self-mixing semiconductor laser

A technology of laser ranging and laser, which is applied in the direction of measuring devices, instruments, electromagnetic wave re-radiation, etc., can solve the problem that laser ranging is difficult to reach the ranging state, and achieve the effect of fast speed and simple operation

Active Publication Date: 2022-07-15
HUNAN GUOTIAN ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the influence of various environmental factors, it is difficult for laser ranging to achieve the ideal ranging state

Method used

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  • A kind of laser ranging method and device based on self-mixing semiconductor laser
  • A kind of laser ranging method and device based on self-mixing semiconductor laser
  • A kind of laser ranging method and device based on self-mixing semiconductor laser

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] like figure 1 As shown, a laser ranging method based on a self-mixing semiconductor laser provided in this embodiment includes the following steps:

[0076] S1: The control module sends a measurement command to the laser emission module. After the laser diode receives the laser emission command issued by the laser emission module, it converts the emitted radiation natural frequency ω 0 Feedback to the phase difference calculation module of the ranging signal in the control module, and emit the laser, the laser emission module will emit the laser at the initial time point t start sent to the timing module;

[0077] S2: After the laser is reflected by the target object, it returns to the original path, and is received by the photodetector in the laser emission cavity. The photodetector converts the received optical signal into an electrical signal, which is amplified and shaped by the amplifying circuit module and the shaping circuit module, and transmitted. To the lase...

Embodiment 2

[0115] like Figure 2-3 As shown, a kind of laser distance measuring device based on self-mixing semiconductor laser provided by the present embodiment comprises a casing 1, a display screen 2 for displaying laser measuring distance parameters and a plurality of operation buttons 3 located at the lower part of the display screen , the casing 1 is provided with a self-mixing semiconductor laser, and the laser is provided with a control module, a laser emission module, a laser diode, a laser emission lens, a receiving laser lens, a photodetector, an amplifying circuit module, a shaping circuit module, a laser receiving module, a timing unit;

[0116] Control module, used to control laser emission, target distance calculation and result display, including ranging signal phase difference calculation module, distance calculation module, display module and reset module;

[0117] The laser transmitting module is used to transmit the laser command signal used for transmitting and ran...

Embodiment 3

[0136]The only difference between this embodiment and Embodiment 2 is that, in order to reduce the interference caused by stray light to the photodetector, a filter and a diaphragm are arranged in front of the receiving laser lens.

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Abstract

The present invention provides a laser ranging method and device based on a self-mixing semiconductor laser. The device includes a casing, a display screen for displaying laser-measured distance parameters, and a plurality of operation buttons located at the lower part of the display screen, wherein the casing is provided with There is a self-mixing semiconductor laser, and the laser is provided with a control module, a laser emitting module, a laser diode, a emitting laser lens, a receiving laser lens, a photodetector, an amplifying circuit module, a shaping circuit module, a laser receiving module, and a timing unit; the laser Phase modulation amplitude σ calculated by phase difference module of ranging signal, laser emission return time τ 0 And the radiation frequency deviation increment Δω is finally calculated by the distance calculation module to calculate the distance L from the laser to the measured object. The laser ranging method and device can accurately measure the laser distance without adjusting the radiation wavelength check or the distance to the reflector, without providing a large number of maximum interference values ​​suitable for the linear segment of the laser wavelength change.

Description

technical field [0001] The invention belongs to the technical field of laser ranging, and in particular relates to a laser ranging method and device based on a self-mixing semiconductor laser. Background technique [0002] Due to its advantages of good directionality, high brightness, and good monochromaticity, lasers are used in terrain surveying, house decoration, engineering surveying, satellite ranging, and robot obstacle avoidance. With the development of technologies such as robots, intelligent driving, and IoT intelligent parking, people put forward higher requirements for the ranging accuracy, measurement time and stability of laser ranging. Due to the influence of various environmental factors, it is difficult for laser ranging to achieve the ideal ranging state. Therefore, how to measure the target distance quickly, accurately and stably has become an urgent problem to be solved in the current intelligent industry. SUMMARY OF THE INVENTION [0003] Aiming at th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/36G01S7/48
CPCG01S17/36G01S7/48
Inventor 易先林陈新张金何畅杨睿
Owner HUNAN GUOTIAN ELECTRONICS TECH CO LTD