Method, device and system for measuring the width of positioning line of laser positioning light source

Abstract

The present invention discloses a method, device, and system for measuring the width of a positioning line of a laser positioning light source. The method comprises two black light baffles F and R disposed opposite and in parallel, with an adjustable gap formed between the black light baffles F and R. A line light source to be measured is disposed vertically above the black light baffles, with the center of the line light source to be measured aligned with the edge of the black light baffles, and the gap can be passed through by the laser positioning line of the line light source to be measured. The present invention utilizes two black light baffles F and R disposed opposite and in parallel, with an adjustable gap formed between the black light baffles F and R, and a laser power meter at a preset position to convert laser line width measurements into gap width measurements, thereby addressing the low measurement accuracy problem of existing area array CCDs.

Description

Technical Field

[0001] The present invention relates to the field of laser detection technology, and in particular to a method, device and system for measuring the width of a positioning line of a laser positioning light source. Background Art

[0002] A laser line source, comprised of a laser diode, optical components, metal components, and electronic circuitry, can produce visible red or green laser markings. These markings are widely used in interior and exterior decoration applications, as well as for other applications such as marking and positioning. The line formed by a laser line source on a projection surface is called a laser line. Its straightness, width, and line quality are key performance indicators. Currently, laser line beam measurement primarily utilizes an area array CCD as a signal acquisition element. This CCD images the laser beam, and through image acquisition and digital image processing, the projected position of the laser beam on the CCD is extracted, thereby determining the beam's position and line width. Alternatively, a developed area array CCD pair, such as a monitor, can be used to capture the laser beam and then measure it visually. The former approach is complex to develop and implement, with low measurement accuracy, limiting its use to static detection. The latter approach also exhibits very low measurement accuracy, and manual readings are hindered by widespread adoption. Summary of the Invention

[0003] The purpose of the present invention is to provide a method, device and system for measuring the width of the positioning line of a laser positioning light source. By using two black light-blocking plates F and R arranged opposite and parallel to each other, and the gap spacing formed between the black light-blocking plates F and the black light-blocking plates R is adjustable, the width measurement of the laser line is converted into the width measurement of the gap through a laser power meter at a preset position, so as to solve the problems of low measurement accuracy or complex application in existing measurement.

[0004] A device for measuring the width of a positioning line of a laser positioning light source, comprising:

[0005] Shading device: two black light-blocking plates F and R arranged opposite and parallel to each other;

[0006] Distance adjustment device: used to adjust the gap distance between the black light blocking plate F and the black light blocking plate R, and the gap can be passed through by the laser positioning line of the measured line light source.

[0007] Furthermore, a distance adjustment device is provided on two adjacent side edges of the black light baffle F and the black light baffle R, and the distance between the black light baffle F and the black light baffle R is adjustable along a direction perpendicular to the gap.

[0008] Furthermore, the distance adjustment device is a micrometer, the black light blocking plate F is fixedly connected to the anvil of the micrometer through a connecting block, and the black light blocking plate R is fixedly connected to the end of the micrometer screw of the micrometer through a connecting block. The micrometer is used to adjust and measure the distance between the black light blocking plates F and R.

[0009] A positioning line width measurement system for a laser positioning light source includes a positioning line width measurement device for the laser positioning light source, wherein the measured line light source is arranged vertically above the black light blocking plate, the measured line light source is arranged vertically above the black light blocking plate, and a measuring surface is arranged below the measured line light source. The vertical distance between the measuring surface and the measured line light source is a standard distance. The measuring surface includes an unobstructed area and an obstructed area. Laser power meters are respectively arranged at preset positions on the unobstructed area and the obstructed area: a laser power meter at point A and a laser power meter at point B. The laser power meter at point A is used to measure the linear laser power passing through a gap in the obstructed area, and the laser power meter at point B is used to measure the linear laser power in the unobstructed area. Points A and B form an isosceles triangle with the measured line light source.

[0010] Furthermore, the diameter of the light-collecting port of the laser power meter should be larger than the width of the positioning line of the measured line light source.

[0011] A method for measuring the width of a positioning line of a laser positioning light source is applied to a positioning line width measurement system of a laser positioning light source. The system is arranged in an optical darkroom and performs the following steps:

[0012] S001. Obtain the power value measured by the laser power meter at point B, and determine the difference between the power value and a preset value;

[0013] S002. If the power is greater than or equal to a preset value, a two-point calibration method is performed to obtain the line width value of the measured line light source;

[0014] S003. If the power is less than a preset value, a single-point calibration method is performed to obtain the line width range of the measured line light source.

[0015] Furthermore, the two-point calibration method specifically includes the following steps:

[0016] S21. Adjust the micrometer to reduce the distance between the black light-blocking plates F and R until the distance between the black light-blocking plates F and R is zero.

[0017] S22. Adjust the micrometer to gradually increase the distance between the black light shields F and R. Simultaneously, observe the power values ​​measured by the laser power meter at point A and the laser power meter at point B until the power value measured by the laser power meter at point A equals the power value measured by the laser power meter at point B. Record the micrometer reading.

[0018] Repeat the above steps until the preset number of measurements is reached, and calculate the average value of the preset number of measurements based on all micrometer readings;

[0019] The average value is determined as the line width value of the measured line light source.

[0020] S31. Adjust the micrometer so that the measured linear light source completely passes through the gap between the black light-blocking plates F and R.

[0021] S32. Obtaining the accumulated laser energy value of the laser power meter at point A within a preset time period;

[0022] S33, repeating step S32 until a preset number of measurements is reached, obtaining a plurality of accumulated laser energy values, and determining a calibration range value based on the plurality of accumulated laser energy values;

[0023] S34. Adjust the micrometer so that the distance between the black light-blocking plates F and R is the preset line width;

[0024] S35. Obtaining the accumulated laser energy value of the preset line width of the laser power meter at point A within a preset time period;

[0025] S36: Determine whether the accumulated laser energy value of the preset line width falls within the calibration range; if so, determine that the line width of the measured line light source is smaller than the preset line width.

[0026] The present invention has the beneficial effects:

[0027] 1. This invention represents a new development in the field of laser indicator measurement. It employs two parallel black light-blocking plates with adjustable gap spacing, and deploys laser power meters at points A and B. The laser power meter at point A measures the power of the line laser passing through the gap, while the laser power meter at point B measures the power of the line laser at the edge of the light-blocking plate. Points A and B form an isosceles triangle with the measured line light source, thereby converting the laser line width measurement into the gap width measurement. The device is simple to set up, has low production costs, and a simple structure, making it suitable for a variety of measurement environments.

[0028] 2. It can not only accurately detect the width of the laser line, effectively avoid human errors and the defect that sampling detection cannot truly reflect the situation of the laser line, thereby improving the accuracy of detection, but also can intuitively display the test results to people in the form of reading, which is easy for people to accept and promote. Moreover, the method is simple to operate, the system structure is simple and easy to implement, and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the measurement method of the present invention;

[0030] Figure 2 Schematic diagram of the two-point calibration method of the present invention;

[0031] Figure 3 Schematic diagram of the single-point calibration method of the present invention;

[0032] Figure 4 This is a schematic diagram of the image acquisition method of the array detector of the present invention;

[0033] Figure 5 Schematic diagram of the measuring device of the present invention;

[0034] Figure 6 A schematic diagram of an isosceles triangle according to the present invention;

[0035] Figure 7 Schematic diagram of the measuring device of the micrometer of the present invention when adjusting the distance Figure 1 ;

[0036] Figure 8 Schematic diagram of the measuring device of the micrometer of the present invention when adjusting the distance Figure 2 ;

[0037] Figure numerals: 01-laser, 02-beam transformation and attenuation system, 03-CCD receiving unit, 04-computer, 05-CCD laser beam diagnosis and analysis system, 1-black light baffle, 2-measured line light source, 3-distance adjustment device, 31-micrometer. DETAILED DESCRIPTION

[0038] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] Unless otherwise specifically stated, the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0040] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0041] Additionally, descriptions of well-known structures, functions, and configurations may be omitted for clarity and conciseness. Those skilled in the art will recognize that various changes and modifications can be made to the examples described herein without departing from the spirit and scope of the present disclosure.

[0042] Technologies, methods and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods and equipment should be considered part of the authorization specification.

[0043] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0044] Example 1

[0045] Positioning line width requirement for radiotherapy laser positioning system: At a distance of 3m from the emission window of the laser transmitter, the laser positioning line width should not exceed 1.0m.

[0046] Currently, there are two main methods for measuring the width of a laser line source. One method uses video to measure, using an area array CCD as a signal acquisition element, placed at the detection point to be measured, and using a video splitter and a display to display images of multiple measurement points to the inspector. Although this method is intuitive, the accuracy is ultimately judged by the human eye, which has low accuracy and large human errors.

[0047] The other type uses linear array CCD. Although it has high accuracy, on the one hand, the photosensitive surface of the linear array CCD is small. On the other hand, the method of placing 3-5 sampling points cannot truly reflect the line width of the laser line, and it is not intuitive, so many people in the industry cannot truly accept this measurement method.

[0048] Specifically, the test method for the positioning line width of the radiotherapy laser positioning system is as follows:

[0049] 1. Test environment: The ambient light intensity is stable and other test environment conditions meet the manufacturer's requirements;

[0050] 2. Measurement plane: 3m away from the laser transmitter window;

[0051] 3. Method: Measurement is performed based on the curtain distribution method of array detector image acquisition method (CCD).

[0052] Array detector image acquisition method (CCD), Figure 4 The image acquisition method using an array detector is shown;

[0053] Test device see Figure 4 , using a two-dimensional array detector (such as area array CCD, area array CMOS, area array pyroelectric detector, etc.) to collect the power (or energy) density distribution of the light beam in the measurement plane, and apply appropriate background correction to the collected data. Calculate the first-order moment and central second-order moment of the measured power or energy density distribution, and then determine the beam width d from the central second-order moment σx′ (z) and d σy′ (z), if the condition of circular power (or energy) density distribution is met, the beam diameter d is determined e (z).

[0054] The beam width is defined as follows:

[0055] d σx (z)=4σ x (z)

[0056] d σy′ (z)=4σ y (z)

[0057] Where the second-order moment of the power or energy density distribution function E(x, y, z) at the beam position z is:

[0058]

[0059]

[0060] In the formula and To the centroid The distance from the center of mass to the first moment is determined, that is:

[0061]

[0062]

[0063] In theory, the integration must be performed over the entire (x, y) plane. In practice, the integration is required over an area that accounts for at least 99% of the beam power (energy).

[0064] In one embodiment, a positioning line width measuring device for a laser positioning light source includes two black light-blocking plates F and R arranged opposite and in parallel, wherein the spacing of the gap formed between the black light-blocking plates F and R is adjustable, and a line light source to be measured is arranged vertically above the black light-blocking plates, and the center of the line light source to be measured is aligned with the edge of the black light-blocking plates, and the gap can be passed through by the laser positioning line of the line light source to be measured.

[0065] Specifically, a distance adjustment device is provided on two adjacent side edges of the black light baffle F and the black light baffle R, and the distance between the black light baffle F and the black light baffle R is adjustable along a direction perpendicular to the gap.

[0066] Specifically, the distance adjusting device is a micrometer, the black light blocking plate F is fixedly connected to the anvil of the micrometer through a connecting block, and the black light blocking plate R is fixedly connected to the end of the micrometer screw of the micrometer through a connecting block. The micrometer is used to adjust and measure the distance between the black light blocking plates F and R.

[0067] It should be noted that the distance adjustment device can also be a linear guide rail or other structures that can achieve adjustable distance.

[0068] Figure 5 The measuring device shown is described in detail as follows:

[0069] In one embodiment, a positioning line width measurement system of a laser positioning light source includes the positioning line width measurement device of the above-mentioned laser positioning light source, a line light source to be measured is arranged vertically above the black light-blocking plate, a measuring surface is arranged below the line light source to be measured, the vertical distance between the measuring surface and the line light source to be measured is a standard distance, the measuring surface includes an unobstructed area and a blocked area, and laser power meters are respectively arranged at preset positions on the unobstructed area and the blocked area: a laser power meter at point A and a laser power meter at point B, the laser power meter at point A is used to measure the line laser power passing through the gap in the blocked area, and the laser power meter at point B is used to measure the line laser power in the unobstructed area; the two points A and B form an isosceles triangle with the line light source to be measured.

[0070] Figure 6 Schematic diagram of an isosceles triangle.

[0071] Figure 7 、 Figure 8 Schematic diagram of the measuring device when adjusting the distance of the micrometer from top to bottom.

[0072] Specifically, the standard distance is 3m.

[0073] Based on a positioning line width measurement system using a laser positioning light source, the initial laser power value at point B was measured in an optical darkroom, including the following two situations:

[0074] It should be noted that the standard requires a line width of 1mm and a straightness of 0.5mm. If the overall vertical movement of the light shield exceeds 0.5mm, the test will not meet the requirements. Therefore, the movement range of the power meter's light aperture is 2mm. If other tests have different requirements for line width and straightness, such as line width a and straightness b, the diameter of the light aperture should be larger by a + 2b. Considering light scattering, it is recommended that the light aperture diameter be at least twice the calculated value. To ensure test accuracy, if an optical darkroom is not available, the test can also be conducted in a location with stable lighting.

[0075] like Figure 1 The overall measurement method flow is shown;

[0076] like Figure 2 The following is the process of two-point calibration method, see case 1 for details;

[0077] Case 1: For a line laser with a laser power exceeding 1W at point B, perform the following steps:

[0078] 1. Adjust the micrometer to merge the black light shields F and R;

[0079] 2. Place the laser power meter at points A and B in the laser.

[0080] 3. Adjust the micrometer so that the black light shield is away from the black light shield so that the values ​​measured by the laser power meter at point A and the laser power meter at point B are consistent. Note the distance at which the micrometer is adjusted. (Measured laser power, unit is W)

[0081] 4. Adjust the micrometer back to the 0 position, merge the black light shields F and R, repeat step 3, and record the micrometer distance 10 times.

[0082] 5. Calculate the average value of the distance measured by the micrometer 10 times as the laser line width.

[0083] It should be noted that in situation one, the laser power value at point B is determined. Taking the laser power value at point B as the calibration value, the micrometer is adjusted so that the black light-blocking plate gradually moves away from the black light-blocking plate, and the count values ​​of the laser power meter at point A and the laser power meter at point B are monitored at the same time. When the value measured by the laser power meter at point A = the value measured by the laser power meter at point B, it is recorded as a successful calibration test. When the above steps are repeated until ten successful calibration tests are completed, the average value of the ten micrometer distances is taken as the laser line width.

[0084] like Figure 3 This is the single-point calibration process, see scenario 2 for details;

[0085] Case 2: For a line laser with a laser power less than 1W measured at point B, perform the following steps:

[0086] 1. Adjust the micrometer to separate the black light shields F and R to ensure that the laser can completely pass through the gap.

[0087] 2. Use a laser power meter to measure the cumulative laser energy at point B within 1 minute. Measure 10 times and obtain the calibration value range, such as (a~b) J. (The measured energy is in J. If the energy is too small, increase the test time and number of times to improve accuracy.)

[0088] 3. Adjust the micrometer so that the gap between the black light shields F and R is 1 mm.

[0089] 4. Use a laser power meter to measure the cumulative laser energy at point A within 1 minute. If the measured value falls within the range of (a~b)J, it proves that the laser line width is less than 1mm, which meets the standard requirements.

[0090] It should be noted that in situation two, the gap distance between the black light-blocking plates F and R is large enough to allow the laser to completely pass through the gap. At this time, the laser power meter at point B can obtain the unobstructed beam energy value within the preset time. After measuring 10 times, the laser energy value range of (a~b)J is obtained. Then, according to the positioning line width requirements of the radiotherapy laser positioning system, the gap distance between the black light-blocking plates F and R is set to 1mm. The laser power meter is used to measure the cumulative laser energy at point A within 1 minute, and it is determined whether the cumulative laser energy within 1 minute falls within the laser energy value range of (a~b)J. If so, it proves that the current gap distance between the black light-blocking plates F and R is less than 1mm, which meets the standard requirements.

[0091] Among them, scenario one is mainly for high-power line lasers and is used for industrial measurement, while scenario two is mainly for low-power lasers and scenarios with high requirements for laser energy.

[0092] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Based on the technical essence of the present invention and within the spirit and principles of the present invention, any simple modification, equivalent replacement and improvement of the above embodiment shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A positioning line width measuring device for a laser positioning light source, characterized in that: include: Shading device: two black light-blocking plates F and R arranged opposite and parallel to each other; Distance adjustment device: used to adjust the gap distance between the black light blocking plate F and the black light blocking plate R, and the gap can be passed through by the laser positioning line of the measured line light source; A line light source to be measured is arranged vertically above the black light-blocking plate, and a measuring surface is arranged below the line light source to be measured. The vertical distance between the measuring surface and the line light source to be measured is a standard distance. The measuring surface includes an unblocked area and a blocked area. Laser power meters are arranged at preset positions on the unblocked area and the blocked area, respectively: a laser power meter at point A and a laser power meter at point B. The laser power meter at point A is used to measure the line laser power passing through the gap in the blocked area, and the laser power meter at point B is used to measure the line laser power in the unblocked area. The apparatus was set up in an optical darkroom and the following steps were performed: S001. Obtain the power value measured by the laser power meter at point B, and determine the difference between the power value and a preset value; S002. If the power is greater than or equal to a preset value, a two-point calibration method is performed to obtain the line width value of the measured line light source; S003. If the power is less than a preset value, a single-point calibration method is performed to obtain the line width range of the measured line light source.

2. The device for measuring the width of a positioning line of a laser positioning light source according to claim 1, characterized in that: Distance adjustment devices are provided on two adjacent side edges of the black light baffle F and the black light baffle R, and the distance between the black light baffle F and the black light baffle R is adjustable along a direction perpendicular to the gap.

3. The positioning line width measuring device of a laser positioning light source according to claim 2, characterized in that: The distance adjustment device is a micrometer, the black light baffle F is fixedly connected to the anvil of the micrometer through a connecting block, and the black light baffle R is fixedly connected to the end of the micrometer screw of the micrometer through a connecting block. The micrometer is used to adjust and measure the distance between the black light baffles F and R.

4. A positioning line width measurement system for a laser positioning light source, characterized in that: A positioning line width measuring device comprising a laser positioning light source as described in any one of claims 1 to 3, wherein the line light source to be measured is arranged vertically above the black light-blocking plate, and a measuring surface is arranged below the line light source to be measured, and the vertical distance between the measuring surface and the line light source to be measured is a standard distance, and the measuring surface includes an unobstructed area and a blocked area, and laser power meters are respectively arranged at preset positions on the unobstructed area and the blocked area: a laser power meter at point A and a laser power meter at point B, the laser power meter at point A is used to measure the line laser power passing through the gap in the blocked area, and the laser power meter at point B is used to measure the line laser power in the unobstructed area; points A and B form an isosceles triangle with the line light source to be measured.

5. The positioning line width measurement system of a laser positioning light source according to claim 4, characterized in that: The diameter of the light-collecting port of the laser power meter should be larger than the positioning line width of the measured line light source.

6. A method for measuring the width of a positioning line of a laser positioning light source, characterized in that: A positioning line width measurement system for a laser positioning light source according to any one of claims 4 to 5 is applied, wherein the system is arranged in an optical darkroom and the following steps are performed: S001. Obtain the power value measured by the laser power meter at point B, and determine the difference between the power value and a preset value; S002. If the power is greater than or equal to a preset value, a two-point calibration method is performed to obtain the line width value of the measured line light source; S003. If the power is less than a preset value, a single-point calibration method is performed to obtain the line width range of the measured line light source.

7. The method for measuring the width of a positioning line of a laser positioning light source according to claim 6, characterized in that: The two-point calibration method specifically includes the following steps: S21. Adjust the micrometer to reduce the distance between the black light-blocking plates F and R until the distance between the black light-blocking plates F and R is zero. S22. Adjust the micrometer to gradually increase the distance between the black light shields F and R. Simultaneously, observe the power values ​​measured by the laser power meter at point A and the laser power meter at point B until the power value measured by the laser power meter at point A equals the power value measured by the laser power meter at point B. Record the micrometer reading. Repeat the above steps until the preset number of measurements is reached, and calculate the average value of the preset number of measurements based on all micrometer readings; The average value is determined as the line width value of the measured line light source.

8. The method for measuring the width of a positioning line of a laser positioning light source according to claim 6, wherein: The single-point calibration method specifically includes the following steps: S31. Adjust the micrometer so that the measured linear light source completely passes through the gap between the black light-blocking plates F and R. S32. Obtaining the accumulated laser energy value of the laser power meter at point A within a preset time period; S33, repeating step S32 until a preset number of measurements is reached, obtaining a plurality of accumulated laser energy values, and determining a calibration range value based on the plurality of accumulated laser energy values; S34. Adjust the micrometer so that the distance between the black light-blocking plates F and R is the preset line width; S35. Obtaining the accumulated laser energy value of the preset line width of the laser power meter at point A within a preset time period; S36: Determine whether the accumulated laser energy value of the preset line width falls within the calibration range; if so, determine that the line width of the measured line light source is smaller than the preset line width.

Images