CN115165125A - Near-infrared light spot detection device and method - Google Patents
Near-infrared light spot detection device and method Download PDFInfo
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- CN115165125A CN115165125A CN202210918967.2A CN202210918967A CN115165125A CN 115165125 A CN115165125 A CN 115165125A CN 202210918967 A CN202210918967 A CN 202210918967A CN 115165125 A CN115165125 A CN 115165125A
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- 238000001514 detection method Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000012360 testing method Methods 0.000 claims abstract description 55
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims description 13
- 238000010606 normalization Methods 0.000 claims description 7
- 238000003672 processing method Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 8
- 230000007547 defect Effects 0.000 abstract description 2
- 230000003287 optical effect Effects 0.000 description 7
- 238000012937 correction Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J11/00—Measuring the characteristics of individual optical pulses or of optical pulse trains
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/0204—Compact construction
- G01J1/0209—Monolithic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4257—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0242—Testing optical properties by measuring geometrical properties or aberrations
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- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a near infrared ray light spot detection device and a method, wherein the detection device comprises a test camera bellows, a test platform is arranged in the test camera bellows, and a test reference port is arranged on the test platform; the inner side wall of the test camera bellows is provided with a target surface, and the target surface is plated with a diffuse reflection coating; the near-infrared light trace tracker is arranged in the testing dark box and is arranged right above the testing reference port, the near-infrared light trace tracker is connected with an external computer, and image processing software is pre-installed in the computer. The device can measure the large-angle near infrared ray light spots, and overcomes the defects of the existing light spot measurement technology in the large-size near infrared ray light spot detection.
Description
Technical Field
The invention belongs to the technical field of optical measurement, and particularly relates to a near infrared ray light spot detection device and method.
Background
Speckle measurement is an important item in the field of optical measurement technology. The detection technology of parameters such as the beam divergence angle, the line width, the energy distribution curve and the like of the line light spot plays a good role in promoting the application of the line light spot. At present, the existing light spot contour detection method is biased to the detection of small-size light spot parameters, and the detection device of a large-size light spot is relatively complex and has higher cost. The patent with publication number CN113740032A discloses a large-size laser spot detection device and method, which utilizes M × N measurement units to discretize laser to be detected, and then collects signals of each unit, laser energy is converted into electric signals through a thermal resistor, and the electric signals are converted into temperature signals through a data collection and processing unit; and then, the temperature distribution is coupled with parameters such as the position and the size of the measuring unit by a mathematical method, so that the size and the energy distribution of the laser spot are obtained. The detection precision of the method is limited by the size of the detection unit, the detection angle range is limited, and the manufacturing process of the detection equipment is complicated. Therefore, the existing large-size light spot detection technology has limited detection angle and few detection schemes for line light spots with large angles. Especially, the near infrared band is the mainstream band in the laser radar market at present, and the light spot detection means for the infrared band is less.
Disclosure of Invention
The invention aims to provide a near infrared ray light spot detection device and a method, based on the fact that a laser beam propagation surface with a certain divergence angle is a spherical surface, in the longitudinal direction and the transverse direction of a light spot section, when the divergence angle in one of the longitudinal direction or the transverse direction is extremely small, the light spot is changed into a linear light spot, the propagation surface can be similar to an arc surface, and therefore a semi-arc diffuse reflection surface is designed, so that the light propagation distances are approximately the same, and the light intensity measurement result is effective; and then diffuse reflection light signals are collected by combining a near-infrared light trace tracker, collected data are processed by a computer to obtain light spot information, and finally the measurement of the large-angle near-infrared light spots is realized, so that the defects of the existing light spot measurement technology in the large-size near-infrared light spot detection are overcome.
The technical scheme adopted by the invention is as follows:
a near infrared light spot detection device comprises a test camera bellows, wherein a test platform is arranged in the test camera bellows, and a test reference port (a light outlet of a light source to be detected is flush with the test reference port) is arranged on the test platform; a target surface is arranged on the inner side wall of the test camera bellows, and a diffuse reflection coating is plated on the target surface; the testing camera bellows is internally provided with a near-infrared light trace tracker which is arranged right above the testing reference port and is connected with an external computer, and image processing software is pre-installed in the computer.
The diffuse reflection coating enables the diffuse reflection light beams to be uniformly distributed, and the attenuation rate of each beam of light received by the near-infrared light trace tracker is consistent.
Further, the horizontal distance between the target surface and the test reference port and the horizontal distance between the target surface and the near-infrared light trace tracker are 30cm.
Furthermore, the target surface is a semicircular arc surface marked with scales, the diameter is 60cm, and the height is 30cm.
The semi-arc target surface marked with scales is designed by utilizing the characteristic that the propagation surface of the laser beam is a spherical surface, wherein the minor axis divergence angle of the linear light spot is relatively small, and the scale line position avoids the light beam irradiation area. Thus, the optical path of each beam of light from the light source to the infrared tracker is similar, so that the attenuation rate of each beam of light is close to the same; and the standard scales are utilized to calibrate the image, so that the precision of the image processing result is higher.
Furthermore, aiming at the laser beam exceeding the light intensity receiving upper limit (high energy) of the near-infrared track tracker, a light attenuation lens is arranged at a test reference port, so that the intensity of the light spot transmitted to the near-infrared track tracker is smaller than the light intensity receiving upper limit of the near-infrared track tracker.
Further, the near infrared optical track tracker is a rotary camera, the rotation axis of the rotary camera is on the symmetry plane of the camera lens, and the rotation axis is perpendicular to the test platform.
The rotating camera rotates to make up the problem of insufficient angle of the lens field of view, so that the detection device can meet the requirements that the detected divergence angle of the long axis reaches 175 degrees and the divergence angle of the short axis does not exceed 5 degrees.
The measuring method of the detecting device of the invention comprises the following steps: fixing a light source light outlet at a test reference port to enable central light of the light source to be aligned to the horizontal center of a target surface, enabling a near-infrared light trace tracker to be arranged 15cm above the test reference port, enabling the near-infrared light trace tracker to collect light beams diffusely reflected by the target surface to obtain a light spot profile image, transmitting light spot profile image data to a computer, and obtaining a divergence angle and a light spot intensity distribution curve of a linear light spot after processing through computer image processing software.
Further, the processing method of the computer image processing software comprises the following steps: firstly, converting image data into a gray-scale image through the image processing software, secondly, acquiring a line spot profile and a spot area gray value, then acquiring a divergence angle of a line spot according to the line spot profile and the scale mark position of a diffuse reflection beam on a target surface, and carrying out normalization processing on the spot area gray value to convert the spot area gray value into a spot intensity distribution curve.
The normalization processing is because the intensities of the light spots acquired at different test distances are different, and the intensity distribution curves of the light spots at different positions can be calculated according to a light intensity transmission equation after the normalization processing.
The invention has the beneficial effects that:
collecting light spot diffuse reflection light beam signals by using a near-infrared light track tracker to form an image, and processing by using a computer to obtain a light spot profile and an energy distribution curve; the target surface is a semicircular arc surface and is provided with a uniform diffuse reflection coating, so that the attenuation rate of the linear light spot reflected to the near infrared light trace tracker is the same; the light attenuation sheet is adopted to reduce the intensity of high-energy light spots, so that the light spots are not diffused on a target surface, the outline of the light spots is more obvious, and meanwhile, the size of the light spots on the light attenuation sheet is collected to correct the divergence angle of the light beams. The device structure of the invention is composed of a semi-closed box, an epitaxial optical platform, a semi-cylindrical diffuse reflection surface, a light trace tracker, a computer and a light attenuation sheet, and has simple structure and lower cost; the target surface is marked with scales, distortion correction can be performed on the image through the scales (the blank target surface marked with scale lines is used for performing distortion algorithm calibration to obtain distortion correction parameters, and then the acquired image is subjected to distortion correction), and the data precision is improved.
Drawings
FIG. 1 is a schematic diagram of the composition of a light spot testing system according to the present invention;
reference numbers: 1. the test camera bellows, 2, the test platform, 3, the test reference mouth, 4, the target surface, 5, the near-infrared light trace tracker, 6, the computer.
Detailed Description
As shown in fig. 1, a near-infrared light spot detection device includes a testing dark box 1, a testing platform 2 is arranged in the testing dark box 1, and a testing reference port 3 is arranged on the testing platform 2 (a light outlet of a light source to be tested is flush with the testing reference port); a target surface 4 is arranged on the inner side wall of the test dark box 1, and a diffuse reflection coating is plated on the target surface 4; a near-infrared light trace tracker 5 is arranged in the test dark box 1, the near-infrared light trace tracker 5 is arranged right above the test reference port 3, the near-infrared light trace tracker 5 is connected with an external computer 6, and image processing software is preinstalled in the computer 6.
The diffuse reflection coating enables diffuse reflection beams to be uniformly distributed, and the attenuation rate of each beam of light received by the near-infrared ray trace tracker is consistent.
The horizontal distance between the target surface 4 and the test reference port 3 and the horizontal distance between the target surface 4 and the near-infrared light trace tracker 5 are 30cm. The target surface 4 is a semiarc surface marked with scales, the diameter is 60cm, and the height is 30cm.
The semi-arc target surface marked with scales is designed by utilizing the characteristic that the propagation surface of the laser beam is a spherical surface, wherein the minor axis divergence angle of the linear light spot is relatively small, and the scale line position avoids the light beam irradiation area. Thus, the optical path of each beam of light from the light source to the infrared tracker is similar, so that the attenuation rate of each beam of light is close to the same; and the image is calibrated by using the standard scales, so that the accuracy of the image processing result is higher.
Aiming at the laser beam exceeding the light intensity receiving upper limit (high energy) of the near infrared track tracker 5, a light attenuation lens is arranged at the test reference port 3, so that the intensity of the light spot transmitted to the near infrared track tracker 5 is smaller than the light intensity receiving upper limit of the near infrared track tracker 5.
The near infrared optical track tracker 5 is a rotary camera, the rotation axis of the rotary camera is on the symmetry plane of the camera lens, and the rotation axis is perpendicular to the test platform. The rotating camera rotates to make up the problem of insufficient angle of the lens field of view, so that the detection device can meet the requirements that the detected divergence angle of the long axis reaches 175 degrees, the divergence angle of the short axis does not exceed 5 degrees, and the detection angle is further increased.
The measuring method of the detecting device of the invention comprises the following steps: fixing a light source light outlet at the position of a test reference port 3, enabling central light of a light source to be aligned to the horizontal center of a target surface 4, enabling a near-infrared light trace tracker 5 to be located 15cm above the test reference port, enabling the near-infrared light trace tracker 5 to collect light beams diffusely reflected by the target surface 4 to obtain a light spot outline image, transmitting light spot outline image data to a computer 6, and obtaining a divergence angle and a light spot intensity distribution curve of a linear light spot after processing through computer image processing software.
The processing method of the computer image processing software comprises the following steps: firstly, converting image data into a gray-scale image through the image processing software, secondly, acquiring a line spot profile and a spot area gray value, then acquiring a divergence angle of a line spot according to the line spot profile and the scale mark position of a diffuse reflection beam on the target surface 4, and carrying out normalization processing on the spot area gray value to convert the spot area gray value into a spot intensity distribution curve.
The normalization processing is because the intensities of the light spots acquired at different test distances are different, and the intensity distribution curves of the light spots at different positions can be calculated according to a light intensity transmission equation after the normalization processing.
Claims (7)
1. A near infrared ray light spot detection device is characterized by comprising a test camera bellows (1), wherein a test platform (2) is arranged in the test camera bellows (1), and a test reference port (3) is arranged on the test platform (2); a target surface (4) is arranged on the inner side wall of the test camera bellows (1), and a diffuse reflection coating is plated on the target surface (4); a near-infrared light trace tracker (5) is arranged in the testing dark box (1), the near-infrared light trace tracker (5) is arranged right above the testing reference port (3), the near-infrared light trace tracker (5) is connected with an external computer (6), and image processing software is preinstalled in the computer (6).
2. The near-infrared ray spot detection device according to claim 1, wherein the horizontal distance between the target surface (4) and the test reference port (3) and the horizontal distance between the target surface (4) and the near-infrared ray trace tracker (5) are 30cm.
3. The near infrared ray spot detection device according to claim 1, wherein the target surface (4) is a graduated semicircular arc surface having a diameter of 60cm and a height of 30cm.
4. A near infrared ray spot detecting device according to claim 1, wherein a light attenuating lens is provided at the test reference port (3) for detecting the laser beam exceeding the upper limit of the light intensity reception of the near infrared ray trace tracker (5).
5. The near infrared ray spot detection device according to claim 1, wherein the near infrared ray track tracker (5) is a rotary camera, the rotation axis of the rotary camera is on the symmetry plane of the camera lens, and the rotation axis is perpendicular to the test platform.
6. The detection method by adopting the detection device as claimed in any one of claims 1 to 5, characterized in that a light source light outlet is fixed at the position of the test reference port (3), the central light of the light source is aligned with the horizontal center of the target surface (4), the near-infrared light trace tracker (5) is arranged at a position 15cm above the test reference port, the near-infrared light trace tracker (5) collects light beams diffusely reflected by the target surface (4) to obtain a light spot profile image, the light spot profile image data is transmitted to the computer (6), and the divergence angle of the line light spot and the light spot intensity distribution curve are obtained after the light beam profile image data is processed by computer image processing software.
7. The method for detecting according to claim 6, wherein the processing method of the computer image processing software is: firstly, converting image data into a gray map through the image processing software, secondly, acquiring a line light spot profile and a light spot area gray value, then acquiring a line light spot divergence angle according to the line light spot profile and the scale mark position of a diffuse reflection light beam on a target surface (4), and converting the light spot area gray value into a light spot intensity distribution curve through normalization processing.
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| CN202210918967.2A CN115165125A (en) | 2022-08-02 | 2022-08-02 | Near-infrared light spot detection device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117761010A (en) * | 2024-02-22 | 2024-03-26 | 山西大学 | high-precision laser liquid refractive index measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117761010A (en) * | 2024-02-22 | 2024-03-26 | 山西大学 | high-precision laser liquid refractive index measuring device |
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