CN113188447A

CN113188447A - Method for improving precision of high-frequency laser scanner

Info

Publication number: CN113188447A
Application number: CN202110518400.1A
Authority: CN
Inventors: 刘丽; 姬淑珍
Original assignee: Daye Aladdin Technology Co ltd
Current assignee: Daye Aladdin Technology Co ltd
Priority date: 2021-05-12
Filing date: 2021-05-12
Publication date: 2021-07-30
Anticipated expiration: 2041-05-12
Also published as: CN113188447B

Abstract

The invention discloses a method for improving the precision of a high-frequency laser scanner, which comprises the steps of selecting the scanning frequency of an output laser head, testing and recording the initial movement speed of the laser head, respectively measuring the number of invalid points in three fixed ranges at fixed point intervals, carrying out deceleration compensation if the measured number of the invalid points in the three fixed ranges meets the conditions, setting an initial value and a stepping value of the deceleration compensation, and judging whether the number of the invalid points in the three fixed ranges meets the preset value through a processor to realize the output of the optimal speed. Through the design of the invention, the production efficiency can be improved, the existing sampling efficiency is greatly reduced, and the time consumed by production is saved.

Description

Method for improving precision of high-frequency laser scanner

Technical Field

The invention belongs to the technical field of laser scanners, and particularly relates to a method for improving the precision of a high-frequency laser scanner.

Background

Although the scanning frequency of the conventional high-frequency scanner is high, the high-frequency acquisition and the speed position are in a direct proportion relation, so that the problems of physical errors, unbalance of error interval values, insufficient acquisition amount, width of a scanning range and the like exist under different frequencies and speeds.

A high-speed fixed-point acquisition precision relation algorithm is performed according to the moving speed of the laser probe, the scanning frequency of the laser probe, the acquisition speed and the pulse position relation, so that the output is realized at the optimal speed and the optimal scanning quality under different frequencies, particularly under high frequency.

Disclosure of Invention

The present invention is directed to a method for improving the accuracy of a high frequency laser scanner to solve the above problems of the related art.

In order to achieve the purpose, the invention provides the following technical scheme: a method for improving the precision of a high-frequency laser scanner is characterized in that a high-speed fixed-point acquisition precision relation algorithm is made according to the relation between the moving speed of a laser probe, the scanning frequency of the laser probe, the acquisition speed and the pulse position. The method comprises the following specific steps:

(1) selecting scanning frequency of an output laser head, and testing and recording initial movement speed of the laser head;

(2) respectively measuring the number of invalid points in three fixed ranges at a point interval of 0.02mm in a single row;

(3) if the number of the invalid points in the three fixed ranges is too large, deceleration compensation is carried out, the initial value of the deceleration compensation is 1%, and the stepping value is increased by 1% or-0.5%;

(4) the processor is used for judging whether the number of the invalid points in the three fixed ranges meets preset judgment indexes, the speed reduction compensation is the adjustment compensation of the speed of the probe in the acquisition process, and the contents acquired by the sensor at different speeds are different.

(5) If the result of the step (4) accords with the set judgment index, outputting the optimal moving speed under the scanning frequency;

(6) if the step (4) does not reach the judgment index meeting the set judgment index, repeating the step (3) to change the speed until the preset judgment index is met, and outputting an optimal value;

preferably, a method for improving the accuracy of a high frequency laser scanner according to claim 1, wherein the moving speed of the test recording laser head is calculated by counting the number of fixed frequency pulses under the condition of known fixed distance;

preferably, the three fixed ranges are respectively within 200mm, within 400mm and within 600 mm.

Preferably, the method for improving the accuracy of the high frequency laser scanner uses a high acquisition rate optical box sensor to enhance the acquisition of the light sensitive feedback, and the sensor can capture a very accurate distance reading at the fastest 66,000 per second, depending on the wavelength of the reflected light.

In the optical acquisition process, the point spacing and the light sensation output frequency are stable. The larger the scanning range distance is, the more the collected content is, and the higher the occurrence probability of invalid points is. Under the stable optical laser frequency, the number of the invalid points can be controlled through speed adjustment, so that the deceleration compensation aims to fill the situation that in the scanning process, different light sensing frequencies 4000HZ, 8000HZ and 12000HZ can be met, the efficiency can be maximized, and the higher the frequency is, the higher the speed needs to be, and the higher the quality needs to be.

Compared with the prior art, the invention has the beneficial effects that:

through the design of the invention, the production efficiency can be improved, the existing sampling efficiency is greatly reduced, and the time consumed by production is saved.

Drawings

FIG. 1 is a schematic flow diagram of the present invention;

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 1, the present invention provides a technical solution: the method for improving the precision of the high-frequency laser scanner comprises the following steps:

preferably, 4000HZ is selected as the light sensation output frequency, the number of fixed frequency pulses is calculated under the condition of known fixed distance, and the initial movement speed of the test recording laser head is measured and calculated;

respectively measuring the number of invalid points within the range of 200mm, within the range of 400mm and within the range of 600mm at the point interval of 0.02mm in a single row;

if the number of the invalid points in the 200mm range, the 400mm range and the 600mm range is too much, the initial value of the deceleration compensation is 1 percent and the stepping value is increased by 1 percent or-0.5 percent within the 200mm range, the 400mm range and the 600mm range;

judging whether the number of invalid points in the range of 200mm, 400mm and 600mm accords with a preset judgment index through a processor, and if so, outputting the optimal moving speed under the scanning frequency; if the preset judgment index is not met, repeating deceleration compensation until the preset optimal value is met;

in the preferred embodiment, 4000HZ is selected as the light sensation output frequency, the dot spacing of 0.02mm is measured, and the optimal result of the 4000HZ light sensation output is that the number of invalid dots within 200mm is zero, the number of invalid dots within 400mm is less than 10, and the number of invalid dots within 600mm is less than 20.

Example 2

preferably, 8000HZ is selected as the light sensation output frequency, the number of fixed frequency pulses is calculated under the condition of known fixed distance, and the initial movement speed of the test recording laser head is measured and calculated;

preferably, 8000HZ is selected as the light sensation output frequency, the dot spacing of 0.02mm is measured, and the optimal result of 8000HZ light sensation output is that the number of invalid dots within 200mm is less than 5, the number of invalid dots within 400mm is less than 10, and the number of invalid dots within 600mm is less than 20.

Example 3

in the preferred embodiment, 12000HZ is selected as the light sensation output frequency, the number of fixed frequency pulses is calculated under the condition of known fixed distance, and the initial movement speed of the test recording laser head is measured and calculated;

in the preferred embodiment, 12000HZ is selected as the light sensation output frequency, the dot spacing of 0.02mm is measured, and the optimal result of 12000HZ light sensation output is that the number of invalid dots within 200mm is less than 10, the number of invalid dots within 400mm is less than 20, and the number of invalid dots within 600mm is less than 40.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A method for improving the precision of a high-frequency laser scanner is characterized in that:

the method comprises the following steps:

(3) if the number of the invalid points in the three fixed ranges exceeds the tolerance number, performing deceleration compensation, wherein the initial value of the deceleration compensation is 1%, and the stepping value is increased by 1% or-0.5%;

(4) judging whether the number of the invalid points in the three fixed ranges meets preset judgment indexes or not through a processor;

(6) if the step (4) does not reach the judgment index meeting the set judgment index, repeating the step (3) to change the speed until the preset judgment index is met, and outputting the optimal value.

2. A method for improving the accuracy of a high frequency laser scanner as defined in claim 1, wherein the moving speed of said test recording laser head is calculated by counting the number of fixed frequency pulses under the condition of a known fixed distance.

3. A method of improving the accuracy of a high frequency laser scanner as defined in claim 1 wherein said three fixed ranges are respectively within 200mm, within 400mm and within 600 mm.

4. A method for improving the precision of a high-frequency laser scanner is characterized in that a high-acquisition-rate light box sensor is used, and acquisition photosensitive feedback is enhanced.