CN115585743A - Positioning line width measuring method, device and system of laser positioning light source - Google Patents

Abstract

The invention discloses a method, a device and a system for measuring the width of a positioning line of a laser positioning light source, wherein the method comprises the following steps: the line light source testing device comprises two opposite and parallel black light barriers F, R, the gap distance formed between the black light barrier F and the black light barrier R is adjustable, a line light source to be tested is arranged vertically above the black light barrier, the center of the line light source to be tested is aligned to the edge of the black light barrier, and the gap can be penetrated by a laser positioning line of the line light source to be tested. According to the invention, through two opposite and parallel black light barriers F, R and the adjustable gap distance formed between the black light barrier F and the black light barrier R, the laser power meter at a preset position is used for converting the width measurement of a laser line into the width measurement of the gap, so that the problem of low measurement precision of the existing area array CCD is solved.

Description

Positioning line width measuring method, device and system of laser positioning light source

Technical Field

The invention relates to the technical field of laser detection, in particular to a method, a device and a system for measuring the width of a positioning line of a laser positioning light source.

Background

The laser line light source is composed of a laser diode, an optical element, a metal structural part and an electronic circuit, can generate red or green visible laser marking, and can be widely used for positioning indoor and outdoor decoration markings and other products. The line formed by the laser line light source on the projection surface is called laser line, and the straightness, width and quality of the laser line are the main indexes. At present, the laser beam is mainly measured by using an area array CCD as a signal acquisition element, the laser beam is imaged through the area array CCD, and projection position information of the laser beam on the CCD is extracted through image acquisition and digital image processing, so that the position and the line width of the laser beam are obtained. Or the laser beam is measured by human eye observation after adopting a camera shooting method through an already developed area array CCD pair, such as a monitor and the like. The former is complex in development and application, and low in measurement accuracy, and can only be used as static detection; the latter has low measurement precision, and manual reading is not beneficial to popularization and application.

Disclosure of Invention

The invention aims to provide a method, a device and a system for measuring the width of a positioning line of a laser positioning light source.

A positioning line width measuring device of a laser positioning light source comprises:

a shading device: two opposite and parallel black light barriers F, R;

the distance adjusting device comprises: the gap distance between the black light barrier F and the black light barrier R is adjusted, and the gap can be penetrated by a laser positioning line of the measured line light source.

Furthermore, distance adjusting devices are arranged on two adjacent side edges of the black light barrier F and the black light barrier R, and the distance between the black light barrier F and the black light barrier R along the direction perpendicular to the gap is adjustable.

Further, the distance adjusting device is a micrometer, the black light barrier F is fixedly connected with an anvil of the micrometer through a connecting block, the black light barrier R is fixedly connected with the end portion of a micrometer screw of the micrometer through the connecting block, and the micrometer is used for adjusting and measuring the distance between the black light barriers F, R.

The utility model provides a laser positioning light source's location line width measurement system, includes the location line width measurement device of a laser positioning light source, set up the measured line light source above the perpendicular of black barn door, the below of measured line light source sets up the measurement face, the vertical distance between measurement face and the measured line light source is the standard distance, the measurement face is including not sheltering from the district and sheltering from the district, do not have the laser power meter of laying in the preset position punishment on sheltering from the district and sheltering from the district respectively: the device comprises a laser power meter at a point A and a laser power meter at a point B, wherein the laser power meter at the point A is used for measuring the linear laser power of a shielding area penetrating through a gap, and the laser power meter at the point B is used for measuring the linear laser power of a non-shielding area; the A, B two points and the measured line light source form an isosceles triangle.

Further, the diameter of a lighting opening of the laser power meter is larger than the width of a positioning line of the measured line light source.

A method for measuring the width of a positioning line of a laser positioning light source is applied to a system for measuring the width of the positioning line of the laser positioning light source, the system is arranged in an optical darkroom, and the following steps are executed:

s001, obtaining a power value measured by a laser power meter of the point B, and judging the power value and a preset value;

s002, if the power is larger than or equal to a preset value, executing a two-point calibration method to obtain a measured line light source line width value;

and S003, if the power is smaller than a preset value, executing a single-point calibration method to obtain the line width range of the light source of the line to be tested.

Further, the two-point calibration method specifically comprises the following steps:

s21, adjusting a micrometer, and reducing the distance between the black light baffles F, R to enable the distance between the black light baffles F, R to be zero;

s22, adjusting a micrometer, gradually increasing the distance between the black light barriers F, R, observing power values measured by the laser power meter at the point A and the laser power meter at the point B at the same time until the measured value of the laser power meter at the point A is equal to the power value of the laser power meter at the point B, and recording the reading of the micrometer;

repeatedly executing the steps until the preset measuring times are reached, and calculating the average value of the preset measuring times according to the readings of all the micrometers;

and determining the average value as the line width value of the measured line light source.

S31, adjusting the micrometer to enable the measured line light source to completely penetrate through gaps between the black light barriers F, R;

s32, in a preset time period, obtaining an accumulated laser energy value of the laser power meter at the point A;

s33, repeatedly executing the step S32 until the preset measuring times are reached, obtaining a plurality of accumulated laser energy values, and determining a calibration range value according to the accumulated laser energy values;

s34, adjusting a micrometer to enable the space between the black light barriers F, R to be a preset line width;

s35, in a preset time period, obtaining an accumulated laser energy value of a preset line width of the laser power meter at the point A;

s36, judging whether the accumulated laser energy value of the preset line width falls into the calibration range value, if so, determining that the line width value of the measured line light source is smaller than the preset line width.

The invention has the following beneficial effects:

1. the invention is a new expansion to the laser index measurement field, through setting up two parallel black light barriers of gap interval adjustable, and lay the laser power meter at A, B two points separately, wherein the laser power meter of A point is used for measuring the line laser power which crosses the gap, the laser power meter of B point is used for measuring the line laser power of the edge of the color light barrier; A. the point B and the light source of the measured line form an isosceles triangle, so that the width measurement of the laser line is converted into the width measurement of the gap, the device is simple and easy to set, low in production cost and simple in structure, and is suitable for various measuring environments;

2. the width of the laser line can be accurately detected, the defects that human errors and sampling detection cannot truly reflect the condition of the laser line are effectively overcome, the detection precision is improved, the detection result can be visually displayed in a reading mode for people, the method is easy to accept and popularize, the method is simple to operate, the system structure is simple, the implementation is easy, and the cost is low.

Drawings

FIG. 1 is a schematic flow chart of a measurement method according to the present invention;

FIG. 2 is a schematic diagram of a two-point calibration method of the present invention;

FIG. 3 is a schematic diagram of a single point calibration method of the present invention;

FIG. 4 is a schematic diagram of an image acquisition method of the array detector of the present invention;

FIG. 5 is a schematic view of a measuring apparatus according to the present invention;

FIG. 6 is a schematic view of an isosceles triangle of the present invention;

FIG. 7 is a first schematic plan view of the micrometer distance adjusting measuring device of the present invention;

FIG. 8 is a schematic top view of a micrometer with a distance measuring device according to the present invention;

reference numerals: 01-laser, 02-light beam conversion attenuation system, 03-CCD receiving part, 04-computer, 05-CCD type laser beam diagnosis and analysis system, 1-black light barrier, 2-measured line light source, 3-distance adjusting device and 31-micrometer.

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. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.

In addition, descriptions of well-known structures, functions, and configurations may be omitted for clarity and conciseness. Those of ordinary skill in the art will recognize that various changes and modifications of the examples described herein can be made without departing from the spirit and scope of the disclosure.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

Example 1

The width requirement of the positioning line of the radiotherapy laser positioning system is as follows: at a distance of 3m from the emission window of the laser emitter, the width of the laser positioning line should not exceed 1.0m.

At present, two types of methods are generally adopted for detecting the line width of a laser line light source, one method adopts a camera shooting method for measurement, an area array CCD is used as a signal acquisition element and is placed on a detection point to be measured, and images of a plurality of measurement points are displayed in front of a detector through a video divider and a display.

The other type is a linear array CCD, although the precision is high, on one hand, the photosensitive surface of the linear array CCD is small, on the other hand, the line width condition of a laser line cannot be truly reflected by adopting a mode of placing 3-5 sampling points, and the method is not intuitive, so that a plurality of people in the industry cannot really accept the method.

Specifically, the test method of the positioning line width of the radiotherapy laser positioning system is as follows:

1. and (3) testing environment: the ambient light illumination is stable, and other test environmental conditions meet the requirements of manufacturers;

2. measuring a plane: 3m away from the emission window of the laser emitter;

3. the method comprises the following steps: the measurement is performed according to a curtain distribution method of a Charge Coupled Device (CCD) method of collecting images by an array detector.

A method of collecting images by an array detector (CCD), fig. 4 shows a method of collecting images by an array detector;

the test device is shown in fig. 4, and a two-dimensional array detector (such as an area array CCD, an area array CMOS, an area array pyroelectric detector and the like) is used for collecting the power (or energy) density distribution of light beams in a measuring area and applying proper background correction to collected data. Calculating the first moment and the central second moment of the measured power or energy density distribution, and determining the beam width d from the central second moment _σx′ (z) and d _σy′ (z) determining the beam diameter d if the condition of a circular power (or energy) density distribution is met _e (z)。

Wherein the beam width is defined as the beam width defined by the second moment relationship of the power or energy density distribution function as:

d _σx (z)＝4σ _x (z)

d _σy′ (z)＝4σ _y (z)

where the second moment of the power or energy density distribution function E (x, y, z) at the beam position z is:

in the formula

And

to the center of mass

The distance of (c). Centroid coordinates to first moment determination, i.e.:

theoretically, it is necessary to integrate the entire (x, y) plane, and in practice, it is required to integrate an area occupying at least 99% of the power (energy) of the light beam.

In one embodiment, the positioning line width measuring device of the laser positioning light source comprises two black light barriers F, R which are arranged oppositely and in parallel, the gap distance formed between the black light barrier F and the black light barrier R is adjustable, a measured line light source is arranged vertically above the black light barrier, the center of the measured line light source is aligned with the edge of the black light barrier, and the gap can be penetrated by a laser positioning line of the measured line light source.

Specifically, distance adjusting devices are arranged on two adjacent side edges of the black light barrier F and the black light barrier R, and the distance between the black light barrier F and the black light barrier R along the direction perpendicular to the gap is adjustable.

Specifically, the distance adjusting device is a micrometer, the black light barrier F is fixedly connected with an anvil of the micrometer through a connecting block, the black light barrier R is fixedly connected with an end of a micrometer screw of the micrometer through a connecting block, and the micrometer is used for adjusting and measuring the distance between the black light barriers F, R.

It should be noted that the distance adjusting device may also be a linear guide rail or other structures capable of achieving adjustable distance.

The measuring device shown in fig. 5 is specifically explained as follows:

in one embodiment, a positioning line width measuring system of a laser positioning light source includes the positioning line width measuring device of the laser positioning light source, a measured line light source is disposed vertically above a black light barrier, a measuring surface is disposed below the measured line light source, a vertical distance between the measuring surface and the measured line light source is a standard distance, the measuring surface includes a non-shielding area and a shielding area, and laser power meters are respectively disposed at preset positions on the non-shielding area and the shielding area: the device comprises a laser power meter at a point A and a laser power meter at a point B, wherein the laser power meter at the point A is used for measuring the linear laser power of a shielding area penetrating through a gap, and the laser power meter at the point B is used for measuring the linear laser power of a non-shielding area; the A, B two points and the measured line light source form an isosceles triangle.

Fig. 6 is a schematic view of an isosceles triangle.

Fig. 7 and 8 are schematic plan views of the measuring device during micrometer distance adjustment.

Specifically, the standard distance is 3m.

A positioning line width measuring system based on a laser positioning light source is tested in an optical darkroom to measure an initial B-point laser power value, and comprises the following two conditions:

it should be noted that, the standard requirement line width is 1mm, the straightness is 0.5mm, and the whole up-down moving light shielding plate exceeds 0.5mm, then the test is not satisfied, so the moving range of the lighting port of the power meter is 2mm. If other requirements on the line width and the straightness are met in other tests, the line width is a, the straightness is b, the diameter of the lighting opening is larger than a +2b, the diameter of the lighting opening is recommended to be more than 2 times of the calculated value in consideration of light scattering, and in order to guarantee the accuracy of the test, the test can be carried out in a light stabilization place if an optical darkroom is not available.

FIG. 1 shows a flow of the overall measurement method;

FIG. 2 shows a two-point calibration process, which is specifically shown in case one;

the first situation is as follows: for the line laser with the laser power measured at the point B exceeding 1W, the following steps are carried out:

1. adjusting a micrometer to combine the black light barriers F, R;

2. respectively placing a laser power meter at a point A and a point B in laser;

3. and adjusting the micrometer to enable the black light barrier to be far away from the black light barrier, so that the numerical values measured by the laser power meter at the point A and the laser power meter at the point B are consistent, and recording the distance of the micrometer. (measured laser Power in W)

4. And (5) adjusting the micrometer to return to the 0 position, combining the black light barriers F, R, repeating the step 3, and recording the distance of the micrometer for 10 times.

5. The average of the distances of the 10 micrometer is calculated as the laser line width.

It should be noted that, in the first case, the laser power value at the point B is determined, the micrometer is adjusted and adjusted by taking the laser power value at the point B as a calibration value, so that the black light barrier is gradually away from the black light barrier, the count values of the laser power meter at the point a and the laser power meter at the point B are simultaneously monitored, when the laser power meter at the point a = the value measured by the laser power meter at the point B, the value is recorded as a successful calibration test, when the above steps are repeated until ten successful calibration tests are completed, and the average value of the distances of ten micrometers is the laser line width.

FIG. 3 shows a single point calibration process, which is specifically shown in case two;

case two: for the line laser with the measured laser power of the point B less than 1W, the following steps are carried out:

1. the micrometer is adjusted to separate the black masks F and R to ensure that the laser light is fully transmitted through the aperture.

2. And (3) measuring the accumulated laser energy within 1min of the point B by using a laser power meter, and measuring for 10 times to obtain a calibration value range value, such as (a-B) J. (measured energy, in J, if too small, the time and frequency of the test can be increased to improve accuracy)

3. The micrometer was adjusted so that the gap distance between the black barrier F and R was 1mm.

4. And measuring the accumulated laser energy within 1min of the point A by using a laser power meter, and if the measured value falls within the range of (a-b) J, proving that the laser line width is less than 1mm and meets the standard requirement.

It should be noted that, in case two, the gap distance between the black light barriers F and R is large enough to allow the laser to completely penetrate through the gap, and at this time, the laser power meter at the point B can obtain an unobstructed beam energy value within a preset time, and the measurement is performed 10 times to obtain the laser energy value range of (a-B) J, and then according to the positioning line width requirement of the radiotherapy laser positioning system, the gap distance between the black light barriers F, R is 1mm, the laser power meter is used to measure the laser energy accumulated within 1min of the point a, and whether the accumulated laser energy within 1min falls within the laser energy value range of (a-B) J is determined, if so, the gap distance between the current black light barriers F and R is proved to be smaller than 1mm, and meets the standard requirement.

The first situation mainly aims at high-power line laser and is used for industrial measurement, and the second situation mainly aims at low-power laser and is used in scenes with requirements on laser energy.

While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications, equivalent arrangements, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims (8)

1. A positioning line width measuring device of a laser positioning light source is characterized by comprising:

a shading device: two opposite and parallel black light barriers F, R;

the distance adjusting device comprises: the gap distance between the black light barrier F and the black light barrier R is adjusted, and the gap can be penetrated by a laser positioning line of the measured line light source.

2. The device for measuring the width of the positioning line of the laser positioning light source as claimed in claim 1, wherein the distance adjusting device is disposed on two adjacent side edges of the black light barrier F and the black light barrier R, and the distance between the black light barrier F and the black light barrier R is adjustable along a direction perpendicular to the slit.

3. The device for measuring the width of the positioning line of the laser positioning light source as claimed in claim 2, wherein the distance adjusting device is a micrometer, the black light barrier F is fixedly connected with an anvil of the micrometer through a connecting block, the black light barrier R is fixedly connected with an end of a micrometer screw of the micrometer through a connecting block, and the micrometer is used for adjusting and measuring the distance between the black light barriers F, R.

4. A positioning line width measuring system of a laser positioning light source, comprising the positioning line width measuring device of a laser positioning light source according to any one of claims 1 to 3, wherein a measured line light source is disposed vertically above the black light barrier, a measuring surface is disposed below the measured line light source, a vertical distance between the measuring surface and the measured line light source is a standard distance, the measuring surface comprises a non-shielding region and a shielding region, and laser power meters are respectively disposed at preset positions on the non-shielding region and the shielding region: the device comprises a laser power meter at a point A and a laser power meter at a point B, wherein the laser power meter at the point A is used for measuring the linear laser power of a shielding area penetrating through a gap, and the laser power meter at the point B is used for measuring the linear laser power of a non-shielding area; A. the two points B and the measured line light source form an isosceles triangle.

5. The system of claim 4, wherein the diameter of the lighting opening of the laser power meter is larger than the width of the positioning line of the line light source to be measured.

6. A method for measuring the width of a positioning line of a laser positioning light source is characterized in that the method is applied to the positioning line width measuring system of the laser positioning light source according to any one of claims 4 to 5, the system is arranged in an optical darkroom, and the following steps are carried out:

s001, obtaining a power value measured by a laser power meter of the point B, and judging the power value and a preset value;

s002, if the power is larger than or equal to a preset value, executing a two-point calibration method to obtain a measured line light source line width value;

and S003, if the power is smaller than a preset value, executing a single-point calibration method to obtain the line width range of the light source of the line to be detected.

7. The method for measuring the positioning line width of the laser positioning light source as claimed in claim 6, wherein the two-point calibration method specifically comprises the following steps:

s21, adjusting a micrometer, and reducing the distance between the black light baffles F, R to enable the distance between the black light baffles F, R to be zero;

s22, adjusting a micrometer, gradually increasing the distance between the black light barriers F, R, observing power values measured by the laser power meter at the point A and the laser power meter at the point B at the same time until the measured value of the laser power meter at the point A is equal to the power value of the laser power meter at the point B, and recording the reading of the micrometer;

repeatedly executing the steps until the preset measuring times are reached, and calculating the average value of the preset measuring times according to the readings of all the micrometers;

and determining the average value as the line width value of the measured line light source.

8. The method for measuring the positioning line width of the laser positioning light source as claimed in claim 6, wherein the single-point calibration method specifically comprises the following steps:

s31, adjusting the micrometer to enable the measured linear light source to completely penetrate through the gap between the black light barriers F, R;

s32, in a preset time period, obtaining an accumulated laser energy value of the laser power meter at the point A;

s33, repeatedly executing the step S32 until the preset measuring times are reached, obtaining a plurality of accumulated laser energy values, and determining a calibration range value according to the accumulated laser energy values;

s34, adjusting a micrometer to enable the space between the black light barriers F, R to be a preset line width;

s35, in a preset time period, obtaining an accumulated laser energy value of a preset line width of the laser power meter at the point A;

s36, judging whether the accumulated laser energy value of the preset line width falls into the calibration range value, if so, determining that the line width value of the measured line light source is smaller than the preset line width.

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