Laser beam divergence angle measuring device with visual analysis system

Abstract

The utility model discloses a laser beam divergence angle measuring device with a visual analysis system, which comprises a laser emitting device, an output light mounting structure, a visual detection and analysis device and a frequency doubling piece imaging device, and can directly observe the form of a laser spot only by optical cable output and coaxial vision on the premise of not using a complex tool. The size of a light spot is obtained through data analysis, and the laser divergence angle is directly calculated.

Description

TECHNICAL FIELD

[0001] The utility model relates to a laser beam divergence angle measuring device with visual analysis system. BACKGROUND

[0002] With the continuous development of laser technology, laser technology as an important modern science and technology, has been widely used in many fields. One of the performance parameters of laser - laser beam divergence angle is an important index to evaluate the quality of laser beam. The size of laser beam divergence angle directly affects the focusing performance and transmission efficiency of laser beam, so the measurement of laser beam divergence angle has important significance in laser technology research and application.

[0003] Traditional laser beam divergence angle measurement methods mainly include geometric method, interference method and transfer beam method. These methods can meet the measurement requirements to some extent, but have problems such as low measurement accuracy, complex operation, long time-consuming, etc., which are difficult to meet the demand of high precision and rapid measurement. Especially in industrial production site, real-time monitoring and accurate control of laser beam divergence angle have important significance, and the traditional measurement method is difficult to meet this demand.

[0004] In order to solve the above problems, the project aims to research and develop a new type of laser beam divergence angle measuring device with coaxial visual analysis system. The device uses coaxial visual analysis system, which can realize rapid and accurate measurement of laser beam divergence angle, has high measurement accuracy and stability.

[0005] Through the implementation of the project scheme, it is expected to provide a high-precision, rapid and easy-to-operate laser beam divergence angle measuring device, which provides effective technical support for laser technology research and application. At the same time, the research results of the project can also be applied to the evaluation of laser beam quality in other fields, which has wide application prospect.

[0006] The research and development of the project scheme aim to promote the development of laser technology, improve the measurement and control level of laser beam quality, and provide technical support for the application of laser technology in industrial production, medical treatment, scientific research and other fields. At the same time, the popularization and application of the research results of the project will play a positive role in promoting the development of China's laser industry. Utility model content

[0007] The utility model aims at providing a laser beam divergence angle measuring device with visual analysis system, which realizes high-precision, rapid and easy-to-operate laser beam divergence angle measurement.

[0008] In order to solve the above problems, the utility model provides a kind of laser beam divergence angle measuring device with visual analysis system, including laser emission device, output light installation structure, visual detection analysis device, frequency doubling piece display device, it is characterized in that, when the output head of laser emission device is installed on output light installation structure, the direction of laser output is defined as first direction, i.e.

[0009] Preferably, laser emission device, the output head of selection is QBH or Q+, and the output head of optical cable is inserted into output light installation structure, and corresponding installation structure is selected according to different output heads.

[0010] Preferably, visual detection analysis device is coaxial visual detection analysis device.

[0011] Preferably, visual detection analysis device is located on the side of the optical axis of output beam, does not shield the main spot of output beam, or, visual detection analysis device is annular visual detection analysis device with central hole, and the central hole of visual analysis device makes the main spot of laser beam pass through without being shielded.

[0012] Preferably, frequency doubling piece display device is placed under laser beam irradiation, and visual detection analysis device is placed in the path of laser beam, and laser is turned on, and laser power is set, so that laser beam irradiates on frequency doubling piece display device, and a green spot can be obtained on frequency doubling piece display device.

[0013] Preferably, computer visual detection software is opened, the size of green spot in effective area on frequency doubling piece display device is identified by computer, the distance between laser beam and frequency doubling piece display device is input, laser beam divergence angle is calculated according to the formula set by software, and the numerical value of laser divergence angle is obtained.

[0014] Preferably, laser beam is emitted from the front end quartz crystal of laser cable, irradiates on the effective area of frequency doubling piece display device, and green spot appears on display device, finally transmitted to computer by visual analysis device for analysis and calculation, and laser beam divergence angle is obtained.

[0015] Preferably, the distance between the input laser beam and the frequency doubling device is obtained by fixing the measuring position, i.e., the output light mounting structure and the frequency doubling device are fixed at a known relative distance; or by fixing the relative position of the output light mounting structure and the frequency doubling device with a fixed support platform, and measuring the relative distance between the output light mounting structure and the frequency doubling device; or by measuring the real-time distance between the output cable head of the laser emitting device or the output light mounting structure and the frequency doubling device with a measuring device.

[0016] Preferably, a plurality of groups of light spot images at different irradiation distances are obtained by changing the distance between the laser beam and the frequency doubling device, a plurality of groups of data are obtained by measuring the groups of light spot images with the visual detection analysis device, and the accuracy of the test results is verified by the plurality of groups of data.

[0017] Preferably, the laser power is higher than 1000W.

[0018] The beneficial effects of the present application are as follows:

[0019] 1. Without using complex tooling, only the output cable and coaxial vision are needed, and the laser spot shape can be directly observed, the spot size can be obtained by data analysis, and the laser divergence angle can be directly calculated.

[0020] 2. No easily damaged devices are used, and human interference is avoided to ensure smooth measurement.

[0021] 3. Through visual detection and real-time computer calculation, the measurement time is shortened, the visual analysis system is used in the present application, no traditional aperture diaphragm light attenuation method is needed, the measurement time is greatly reduced, and the measurement can be quickly performed.

[0022] 4. Accurate measurement: the size of the laser beam spot at the fixed position is analyzed by the coaxial visual analysis system, the errors caused by human and equipment operation in the traditional measurement method are solved, and the measurement accuracy is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of the present application.

[0024] Figure 2 is a light path schematic diagram of the present application.

[0025] Figure 3 is a light spot schematic diagram of the present application. DETAILED DESCRIPTION

[0026] The technical solutions of the present application will be further described in combination with the drawings and specific embodiments.

[0027] The laser beam divergence angle measuring device with a visual analysis system adopts a direct emission mode, emits laser along a first direction (for example, emits laser from top to bottom in a vertical direction), irradiates the light beam to the frequency-doubling sheet display device placed on a plane through an output optical cable, changes the irradiation distance by changing the position (for example, the up-down position) of the laser emission device along the first direction, and strengthens the accuracy of the verification test result through multiple groups of data.

[0028] The visual detection and analysis device is arranged between the output light beam and the display device, the laser beam is irradiated to the display device, the visual detection and analysis device detects and analyzes the size of the light spot on the display device, calculates through the formula recorded in the computer, and obtains the laser beam divergence angle. In order to make the visual detection and analysis device not affect the light field of the output light beam, the visual detection and analysis device can be located on one side of the optical axis of the output light beam and does not block the main light spot of the output light beam. Of course, the visual detection and analysis device can also be a ring-shaped visual detection and analysis device with a central hole, so that the central hole of the visual analysis device can make the main light spot of the output light beam pass through without being blocked. Based on the above, the visual detection and analysis device can be a coaxial visual detection and analysis device or an off-axis visual detection and analysis device. Of course, the coaxial visual detection and analysis device is preferably adopted, so that the light spot pattern obtained by detection is basically not distorted and can be analyzed more accurately.

[0029] The display device and the visual system analysis can greatly reduce the shaking and damage of the conventional aperture diaphragm in use, and can ensure the stability and reliability of the equipment during laser beam measurement.

[0030] As shown in Figure 1 The utility model discloses a laser beam divergence angle measuring device with a visual analysis system, adopts the mode of direct emission, along the first direction emission laser (for example, in vertical direction from top to bottom emission laser), by output optical cable irradiation light beam to place in the plane of the frequency-doubling sheet display device, can pass through changing the position of laser emission device along the first direction (for example is up-down position), change the irradiation distance, through multiple groups of data to strengthen the accuracy of verification test result. The visual analysis system comprises a visual detection and analysis device and some necessary information transmission modules and / or calculation modules.

[0031] The specific implementation method refers to the following steps:

[0032] Step one: prepare a laser emitting device 1, select the appropriate output head (QBH, Q+, etc.), insert the optical cable output head into the output light mounting structure 2, and select the corresponding mounting structure according to different output heads.

[0033] Step two: place the frequency doubling film imaging device 4 under the laser beam irradiation, after the above device is installed, place the visual detection and analysis device 3 in the laser beam path, and all the test preparation work is completed.

[0034] Step three: turn on the laser, set the laser power so that the laser beam irradiates the frequency doubling film imaging device 4, and a green spot appears on the frequency doubling film imaging device.

[0035] Step four: open the computer vision detection software, the computer identifies the size of the green spot 8 in the effective area 11 of the frequency doubling film imaging device (see Figure 10), inputs the distance 9 between the laser beam and the frequency doubling film imaging device, calculates the laser beam divergence angle according to the formula set by the software, and obtains the value of the laser divergence angle.

[0036] Step five: Figure Two The method for measuring the laser beam divergence angle is shown in the figure, the laser beam is emitted from the front end of the quartz crystal 5 of the laser cable, the laser beam 6 irradiates into the effective area 11 of the frequency doubling film imaging device 4, and a green spot 8 appears on the imaging device. Finally, the visual analysis device 3 transmits to the computer for analysis and calculation, and the laser beam divergence angle is obtained.

[0037] The way to obtain the distance 9 between the input laser beam and the frequency doubling film imaging device before the imaging device can be fixed measurement, that is, the output light mounting structure 2 and the frequency doubling film imaging device 4 are installed in the fixed position with known relative distance; Or, a fixed support platform is used to fix the relative position of the output light mounting structure 2 and the frequency doubling film imaging device 4; Or, a measuring device is used to measure the real-time distance between the optical cable output head or the output light mounting structure 2 of the laser emitting device and the frequency doubling film imaging device. Preferably, the laser beam power is higher than 1000W.

[0038] Compared with a mode of directly detecting the shape of the output light spot by using a high-power CCD camera, the scheme not only has a lower cost (the requirement of the camera is lower), but also avoids the problem that the direct CCD detection method under high-power laser must additionally set an attenuation piece (the setting of the attenuation piece may destroy the shape distribution of the original light field, leading to inaccurate measurement and affecting the result, of course, the corresponding direct CCD detection scheme in the prior art scheme may not mention the existence of the attenuation piece, but the attenuation piece is necessary under high power), and has a wide application range, low cost, easy implementation, fast measurement for general lasers, and obvious precision advantage for high-intensity lasers with a power higher than 1000W.

[0039] The technical scheme of the utility model not only comprises the optical system suitable for the laser beam divergence angle measurement, makes the laser beam pass through the coaxial vision analysis system, but also relates to the image processing mode, extracts the laser beam divergence angle information, develops the data processing and display unit, realizes the real-time display of the measurement result, assembles and debugs the device, and guarantees normal operation.

[0040] The scheme improves the measurement precision, directly analyzes and judges the size of the laser irradiation light spot at a fixed distance by installing the coaxial vision analysis system on the laser beam emission path, and measures the laser divergence angle, improves the measurement speed, and only needs to transmit the vision analysis result to the computer to calculate the divergence angle of the laser beam.

[0041] The technical principle of the utility model is described above in combination with specific embodiments. The description is only for explaining the principle of the utility model, and cannot be explained as the limitation of the protection scope of the utility model in any way. Based on the explanation herein, the person skilled in the art can think of other specific embodiments of the utility model without creative labor, and these embodiments will fall within the protection scope of the utility model.

Claims

1. A laser beam divergence angle measuring device with visual analysis system, comprising a laser emitting device, an output light mounting structure, a visual detection analysis device, a frequency doubling slice display device, characterized in that, When the output head of the laser emitting device is installed on the output light mounting structure, the direction of the laser output is defined as the first direction, i.e. the laser irradiates along the first direction, the frequency doubling sheet imaging device is arranged in the light path of the laser irradiating along the first direction, the laser beam irradiates on the frequency doubling sheet imaging device, and a complete light spot is obtained on the frequency doubling sheet imaging device, and the visual detection and analysis device is placed between the output light mounting structure and the frequency doubling sheet imaging device and used for detecting the light spot; the laser beam divergence angle is calculated by identifying the size of the light spot in the effective area of the frequency doubling sheet imaging device and the distance between the laser beam and the frequency doubling sheet imaging device.

2. The laser beam divergence angle measuring apparatus with vision analysis system according to claim 1, characterized in that, The laser emitting device, the selected output head is QBH or Q+, the optical cable output head is inserted into the output light mounting structure, and the corresponding mounting structure is selected according to different output heads.

3. The laser beam divergence angle measuring apparatus with vision analysis system according to claim 1, wherein, The visual detection and analysis device is a coaxial visual detection and analysis device.

4. The laser beam divergence angle measuring apparatus with vision analysis system according to claim 1, wherein, The visual detection and analysis device is located on one side of the optical axis of the output light beam and does not block the main light spot of the output light beam, or the visual detection and analysis device is a ring-shaped visual detection and analysis device with a central hole, and the central hole of the visual analysis device allows the main light spot of the laser beam to pass through without being blocked.

5. The laser beam divergence angle measuring apparatus with vision analysis system according to claim 1, wherein, The frequency doubling sheet imaging device is placed below the laser beam irradiation, the visual detection and analysis device is placed in the laser beam path, the laser is turned on, and the laser power is set so that the laser beam irradiates on the frequency doubling sheet imaging device and a green light spot is obtained on the frequency doubling sheet imaging device.

6. The laser beam divergence angle measuring apparatus with vision analysis system according to claim 5, characterized in that, The computer visual detection software is opened, the computer identifies the size of the green light spot in the effective area of the frequency doubling sheet imaging device, inputs the distance between the laser beam and the frequency doubling sheet imaging device, calculates the laser beam divergence angle according to the formula set by the software, and obtains the numerical value of the laser divergence angle.

7. The laser beam divergence angle measuring apparatus with vision analysis system according to claim 6, characterized in that, The laser beam is emitted from the front end quartz crystal of the laser cable, irradiates on the effective area of the frequency doubling sheet imaging device, and a green light spot is displayed on the imaging device, which is finally transmitted to the computer by the visual analysis device for analysis and calculation to obtain the laser beam divergence angle.

8. The laser beam divergence angle measuring apparatus with vision analysis system according to claim 6, wherein, For the method of obtaining the distance between the input laser beam and the frequency doubling sheet imaging device: the output light mounting structure and the frequency doubling sheet imaging device are installed at fixed positions with a known relative distance; or a fixed support platform is used to fix the relative positions of the output light mounting structure and the frequency doubling sheet imaging device, and the relative distance between the mounting structure and the frequency doubling sheet imaging device is measured; or a measuring device is used to measure the real-time distance between the cable output head or the output light mounting structure of the laser emitting device and the frequency doubling sheet imaging device.

9. The laser beam divergence angle measuring apparatus with vision analysis system according to claim 6, wherein, By changing the distance between the laser beam and the frequency doubling sheet imaging device, a plurality of light spot images under different irradiation distances are obtained, a plurality of data are obtained by measuring each group of light spot images through the visual detection and analysis device, and the accuracy of the test results is verified through the plurality of data.

10. The laser beam divergence angle measuring apparatus with vision analysis system according to claim 5, wherein, The laser power is higher than 1000W.

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