Laser beam verticality and spot ellipticity rapid analysis system and test method

Abstract

The laser beam verticality and spot ellipticity rapid analysis system disclosed in the present invention comprises: a laser transmission cable calibration mechanism, which is used to fix the laser transmission cable and calibrate the central axis of the output end of the laser transmission cable; a semi-transparent mask arranged in front of the laser transmission cable calibration mechanism; a mask driving mechanism for driving the semi-transparent mask to reciprocate along the central axis direction; a proximity switch mechanism arranged on one side of the semi-transparent mask; an imaging mechanism arranged in front of the semi-transparent mask and connected to the proximity switch mechanism; and an image analysis module, which is used to receive an image taken by the imaging mechanism and process the received image, and calculate the beam verticality and ellipticity of the laser transmission cable. A test method for the above-mentioned laser beam verticality and spot ellipticity rapid analysis system is also disclosed. The present invention has the advantages of simple structure, low preparation cost, high test efficiency, and more convenient inspection and maintenance.

Description

Technical Field

[0001] The invention relates to the field of optical fiber laser technology, and in particular to a laser beam verticality and spot ellipticity rapid analysis system and a testing method thereof. Background Art

[0002] With the development of laser technology, lasers are widely used in various industries, and the quality of laser beams has always been an important parameter of lasers, such as the verticality of laser beams, the ellipticity of the spot, the divergence of the beam, the energy distribution, etc. For laser transmission optical cables (QBH), it is only necessary to quickly measure the verticality and the ellipticity of the spot. The existing common method is to use a beam quality analyzer to conduct a comprehensive test on the beam quality of laser transmission optical cables, which has the following disadvantages:

[0003] 1. The beam quality analyzer takes a long time to analyze the beam quality;

[0004] 2. The beam quality analyzer can only work under the following environmental and hardware conditions: optical platform, collimator, beam splitter, heat dissipation black body, black room, etc.

[0005] 3. The beam quality analyzer requires the cooperation of the collimator and the beam splitter. Both the lens and the beam quality analyzer require very professional personnel to operate, arrange, maintain and service.

[0006] 4. Currently, most beam quality analyzers rely on imports, and the price cost is extremely high;

[0007] 5. If the beam quality analyzer is used frequently, it needs to be returned to the factory for calibration and maintenance. The cost of calibration and maintenance is high and the cycle is also long;

[0008] 6. Existing beam quality analyzers have many detection functions, which can provide detailed parameters for laser beam quality analysis. However, this is a waste of resources for laser transmission cables or certain optical accessories that only require a small amount of analysis.

[0009] Therefore, the applicant has found a solution to the above-mentioned problem through beneficial exploration and research, and the technical solution to be introduced below is produced in this context. Summary of the invention

[0010] One of the technical problems to be solved by the present invention is to provide a laser beam verticality and spot ellipticity rapid analysis system with a simple structure, low preparation cost, high test and analysis effect, and convenient overhaul and maintenance in view of the deficiencies in the prior art.

[0011] The second technical problem to be solved by the present invention is to provide a testing method for the above-mentioned laser beam verticality and spot ellipticity rapid analysis system.

[0012] The laser beam verticality and spot ellipticity rapid analysis system as the first aspect of the present invention comprises:

[0013] A laser transmission optical cable calibration mechanism, which is used to fix the laser transmission optical cable and perform central axis calibration on the output end of the laser transmission optical cable;

[0014] A semi-transparent mask disposed directly in front of the laser transmission optical cable calibration mechanism;

[0015] A mask driving mechanism for driving the semi-transparent mask to reciprocate along the central axis direction;

[0016] A proximity switch mechanism disposed on one side of the translucent mask;

[0017] an imaging mechanism disposed in front of the semi-transparent mask and connected to the proximity switch mechanism, wherein the imaging mechanism exposes and photographs the back side of the semi-transparent mask under the control of the proximity switch mechanism; and

[0018] An image analysis module is connected to the imaging mechanism and is used to receive the image taken by the imaging mechanism and process the received image, and calculate the verticality and ellipticity information of the light beam of the laser transmission optical cable.

[0019] In a preferred embodiment of the present invention, the laser transmission optical cable calibration mechanism comprises:

[0020] Fixed snap ring;

[0021] A plurality of calipers arranged at circumferential intervals on the fixing clamp ring for fixing the output end of the laser transmission optical cable; and

[0022] The first and second calibration cameras are used to calibrate the central axis of the output end of the fixed laser transmission optical cable.

[0023] In a preferred embodiment of the present invention, the first and second calibration cameras are arranged on a plane perpendicular to the central axis of the output end of the laser transmission optical cable, and the angle formed by the line between the center of the first calibration camera and the central axis of the output end of the laser transmission optical cable and the line between the center of the second calibration camera and the central axis of the output end of the laser transmission optical cable is 90°.

[0024] In a preferred embodiment of the present invention, the central axis of the semi-transparent mask and the central axis of the output end of the laser transmission optical cable are on the same axis.

[0025] In a preferred embodiment of the present invention, the translucent mask is a uniform translucent high temperature resistant crystal plate.

[0026] In a preferred embodiment of the present invention, the mask driving mechanism comprises:

[0027] A travel axis disposed on one side of the translucent mask and extending along the central axis direction of the translucent mask;

[0028] A mask fixing base slidably sleeved on the travel shaft and connected to the translucent mask for driving the translucent mask to reciprocate along the central axis direction thereof;

[0029] A travel motor which is sleeved on the travel shaft and connected to the cover plate fixing base and can slide back and forth along the axial direction of the travel shaft; and

[0030] A photosensitive switch is arranged behind the semi-transparent mask and connected to the travel motor.

[0031] In a preferred embodiment of the present invention, the proximity switch mechanism is composed of a plurality of Hall switches equidistantly distributed along the central axis of the translucent mask, and each Hall switch is respectively connected to the imaging mechanism.

[0032] In a preferred embodiment of the present invention, the imaging mechanism is an infrared CCD camera, and the center of the infrared CCD camera and the center axis of the semi-transparent mask are on the same axis.

[0033] In a preferred embodiment of the present invention, the image analysis module is a finite element grayscale analysis system.

[0034] As a second aspect of the present invention, a testing method of the above-mentioned laser beam verticality and spot ellipticity rapid analysis system comprises the following steps:

[0035] Step S10, using a laser transmission optical cable calibration mechanism to fix the output end of the laser transmission optical cable, and calibrating the central axis of the output end of the laser transmission optical cable, so that the central axis of the output end of the laser transmission optical cable and the central axis of the semi-transparent mask are on the same axis;

[0036] Step S20, controlling the light source to emit a laser beam, and the laser beam is irradiated onto the semi-transparent mask through the output end of the laser transmission optical cable;

[0037] Step S30, the mask driving mechanism drives the semi-transparent mask to move toward the imaging mechanism;

[0038] Step S40, when the semi-transparent mask passes by the proximity switch mechanism, the proximity switch mechanism is triggered to transmit a start signal to the imaging mechanism;

[0039] Step S50, after the imaging mechanism receives the start signal transmitted by the proximity switch mechanism, it exposes and photographs the back side of the semi-transparent mask, and transmits the photographed image to the graphic analysis module;

[0040] Step S60, after the graphic analysis module receives the image transmitted by the imaging mechanism, it performs grayscale processing on the received image, performs grayscale finite element analysis on the image after grayscale processing, calculates the grayscale value of each position of the image, and then calculates the deviation value from the image center reference point based on the grayscale values ​​of different positions of the image, and then compares the calculated deviation value with the standard parameters to calculate the verticality and ellipticity of the light beam of the laser transmission cable.

[0041] Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0042] 1. Compared with the spot test performed by the beam quality analyzer, the present invention does not require auxiliary components such as collimation or beam splitter, has a simple structure and low preparation cost;

[0043] 2. The present invention has high efficiency in testing individual devices;

[0044] 3. The present invention does not require any auxiliary mirror during testing. It only needs to align the output end of the laser transmission optical cable with the central axis of the semi-transparent mask to perform the test, which is simpler to operate.

[0045] 4. Compared with the beam quality analyzer, the present invention is more convenient to inspect and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 It is a structural schematic diagram of the present invention.

[0048] Figure 2 It is a structural schematic diagram of the laser transmission calibration mechanism of the present invention.

[0049] Figure 3 It is a structural schematic diagram of the mask driving mechanism of the present invention.

[0050] Figure 4 It is an imaging schematic diagram of the imaging mechanism of the present invention.

[0051] Figure 5 It is a schematic diagram of grayscale processing of an image according to the present invention.

[0052] Figure 6 It is a schematic diagram of the grayscale finite element analysis of an image according to the present invention.

[0053] Figure 7 It is a schematic diagram of comparing the deviation value calculated by the present invention with the standard parameter.

[0054] Figure 8 It is a schematic flow chart of the testing method of the present invention. DETAILED DESCRIPTION

[0055] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0056] See also Figure 1 The figure shows a laser beam verticality and spot ellipticity rapid analysis system, including a laser transmission cable calibration mechanism 100, a semi-transparent mask 200, a mask driving mechanism 300, a proximity switch mechanism 400, an imaging mechanism 500 and an image analysis module 600.

[0057] The laser transmission optical cable calibration mechanism 100 is used to fix the laser transmission optical cable and calibrate the central axis of the output end 11 of the laser transmission optical cable 10. Figure 2 , the laser transmission optical cable calibration mechanism 100 includes a fixed clamp ring 110, three calipers 120 and calibration cameras 130a, 130b. The three calipers 120 are arranged on the fixed clamp ring 110 at intervals in the circumferential direction, and are used to fix the output end 11 of the laser transmission optical cable 10. Of course, the number of calipers 120 is not limited to the number in this embodiment, and it should be set according to the fixing requirements. The calibration cameras 130a, 130b are used to calibrate the central axis of the output end 11 of the fixed laser transmission optical cable 10. The calibration cameras 130a, 130b are arranged on a plane perpendicular to the central axis (Z axis) of the output end 11 of the laser transmission optical cable 10, and the angle between the line between the center of the calibration camera 130a and the central axis of the output end 11 of the laser transmission optical cable 10 and the line between the center of the calibration camera 130b and the central axis of the output end 11 of the laser transmission optical cable 10 is 90°. In this embodiment, the calibration camera 130a is located directly above the output end 11 of the laser transmission optical cable 10, on the Y axis, and the calibration camera 130b is located directly to the side of the output end 11 of the laser transmission optical cable 10, on the X axis.

[0058] The semi-transparent mask 200 is arranged in front of the laser transmission optical cable calibration mechanism 100. The central axis of the semi-transparent mask 200 is coaxial with the central axis of the output end 10 of the laser transmission optical cable calibration mechanism 100. In this embodiment, the semi-transparent mask 200 is a uniform semi-transparent high temperature resistant crystal plate.

[0059] The mask driving mechanism 300 is used to drive the semi-transparent mask 200 to reciprocate along the central axis direction. Figure 3 The mask driving mechanism 300 includes a travel shaft 310, a mask fixing base 320, a travel motor 330 and a photosensitive switch 340. The travel shaft 310 is arranged on one side of the semi-transparent mask 200 (at Figure 3 In the embodiment, the travel shaft 310 is located below the translucent mask 200 and extends along the central axis of the translucent mask 200. The mask fixing base 320 is slidably mounted on the travel shaft 310 and connected to the translucent mask 200, and is used to drive the translucent mask 200 to reciprocate along the central axis. The travel motor 330 is mounted on the travel shaft 310 and connected to the mask fixing base 320 and can slide back and forth along the axial direction of the travel shaft 310. The photosensitive switch 340 is arranged at the rear of the translucent mask 200 and connected to the travel motor 330. When the photosensitive switch 340 detects that the translucent mask 200 is irradiated by the laser, the photosensitive switch 340 is triggered and generates a start signal to send to the travel motor 330. After receiving the start signal, the travel motor 330 acts to drive the mask fixing base 320 to move, and the mask fixing base 320 drives the translucent mask 200 to move along the axial direction of the travel shaft 310 toward the imaging mechanism.

[0060] The proximity switch mechanism 400 is arranged on one side of the semi-transparent mask 200. The proximity switch mechanism 400 is composed of five Hall switches 410 that are equally spaced and distributed along the central axis direction of the semi-transparent mask 200, and each Hall switch 410 is connected to the imaging mechanism 500. Of course, the number of the Hall switches 410 is not limited to the number in this embodiment, and it should be set according to the requirements of photographing. When the semi-transparent mask 200 approaches any Hall switch 410, the Hall switch 410 will be triggered and generate a start signal to be sent to the imaging mechanism 500.

[0061] The imaging mechanism 500 is arranged in front of the semi-transparent mask 200 and connected to the proximity switch mechanism 400. The imaging mechanism 500 exposes and photographs the back side of the semi-transparent mask 200 under the control of the proximity switch mechanism 400. In this embodiment, the imaging mechanism 500 is an infrared CCD camera, and the center of the infrared CCD camera is on the same axis as the central axis of the semi-transparent mask 200. When the infrared CCD camera receives a start signal sent by any Hall switch 410, the infrared CCD camera will expose and photograph the back side of the semi-transparent mask 200.

[0062] The image analysis module 600 is connected to the imaging mechanism 500, and is used to receive the image captured by the imaging mechanism 500, process the received image, and calculate the beam verticality and ellipticity information of the laser transmission cable. In this embodiment, the image analysis module 600 is a finite element grayscale analysis system.

[0063] See also Figure 8 , the figure shows a test method for a laser beam verticality and spot ellipticity rapid analysis system, including the following steps:

[0064] Step S10, using the laser transmission optical cable calibration mechanism 100 to fix the output end 11 of the laser transmission optical cable 10, and calibrating the central axis of the output end 11 of the laser transmission optical cable 10, so that the central axis of the output end 11 of the laser transmission optical cable 10 and the central axis of the semi-transparent mask 200 are on the same axis. Figure 2 First, insert the output end 11 of the laser transmission optical cable 10 into the fixing clamp 110, and use three calipers 120 to clamp the outer peripheral surface of the output end 11 of the laser transmission optical cable 10, so that the output end 11 of the laser transmission optical cable 10 is fixed; then the system automatically or the operator manually calibrates the central axis of the output end 11 of the laser transmission optical cable 10 according to the imaging of two cameras 130a and 130b at 90 degrees to each other, to ensure that the central axis of the output end 11 of the laser transmission optical cable 10 and the central axis of the translucent mask 200 are on the same axis.

[0065] Step S20 , controlling the light source to emit a laser beam, and the laser beam is irradiated onto the semi-transparent mask 200 through the output end 11 of the laser transmission optical cable 10 .

[0066] Step S30: the mask driving mechanism 300 drives the semi-transparent mask 200 to move toward the imaging mechanism 500. Figure 3When the photosensitive switch 340 detects that the translucent mask 200 is irradiated by the laser, the photosensitive switch 340 is triggered and generates a start signal to be sent to the travel motor 330. After receiving the start signal, the travel motor 330 operates to drive the mask fixing base 320 to move. The mask fixing base 320 drives the translucent mask 200 to move along the axial direction of the travel shaft 310 toward the imaging mechanism.

[0067] Step S40, when the semi-transparent mask 200 passes close to the proximity switch mechanism 400, the proximity switch mechanism 400 is triggered to transmit a start signal to the imaging mechanism 500. Specifically, when the semi-transparent mask 200 approaches any Hall switch 410, the Hall switch 410 is triggered and generates a start signal to send to the imaging mechanism 500.

[0068] Step S50, after the imaging mechanism 500 receives the start signal transmitted by the proximity switch mechanism 400, it exposes and photographs the back side of the semi-transparent mask 200, and transmits the photographed image to the graphic analysis module 600. Specifically, when the infrared CCD camera receives the start signal sent by any Hall switch 410, the infrared CCD camera will expose and photograph the back side of the semi-transparent mask 200, such as Figure 4 As shown, the captured image is transmitted to the graphic analysis module.

[0069] Step S60: After receiving the image transmitted by the imaging mechanism 500, the graphic analysis module 600 performs grayscale processing on the received image. Figure 5 As shown, the grayscale finite element analysis is performed on the grayscale processed image, as shown in Figure 6 As shown, the gray value of each position of the image is calculated, and then the deviation value from the image center reference point is calculated according to the gray value of different positions of the image, and then the calculated deviation value is compared with the standard parameter (such as Figure 7 After that, the verticality and ellipticity of the beam of the laser transmission cable are calculated.

[0070] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. Laser beam verticality and spot ellipticity rapid analysis system, characterized by: include: A laser transmission optical cable calibration mechanism, which is used to fix the laser transmission optical cable and perform central axis calibration on the output end of the laser transmission optical cable; A semi-transparent mask disposed directly in front of the laser transmission optical cable calibration mechanism; A mask driving mechanism for driving the semi-transparent mask to reciprocate along the central axis direction; A proximity switch mechanism disposed on one side of the translucent mask; An imaging mechanism is arranged in front of the semi-transparent mask and connected to the proximity switch mechanism, and the imaging mechanism exposes and photographs the back side of the semi-transparent mask under the control of the proximity switch mechanism; as well as An image analysis module, which is connected to the imaging mechanism and is used to receive the image taken by the imaging mechanism and process the received image, and calculate the verticality and ellipticity of the light beam of the laser transmission optical cable; The mask driving mechanism includes a photosensitive switch. When the photosensitive switch detects that the translucent mask is irradiated by the laser, the photosensitive switch is triggered and generates a start signal to be sent to the travel motor. After receiving the start signal, the travel motor moves to drive the mask fixing base to move. The mask fixing base drives the translucent mask to move along the axial direction of the travel axis toward the imaging mechanism. The proximity switch mechanism is composed of a plurality of Hall switches that are equidistantly distributed along the central axis of the translucent mask, and each Hall switch is connected to the imaging mechanism respectively; When the semi-transparent mask passes by the proximity switch mechanism, the proximity switch mechanism is triggered to transmit a start signal to the imaging mechanism; After receiving the start signal transmitted by the proximity switch mechanism, the imaging mechanism exposes and photographs the back side of the semi-transparent mask, and transmits the photographed image to the image analysis module; After receiving the image transmitted by the imaging mechanism, the image analysis module performs grayscale processing on the received image, performs grayscale finite element analysis on the grayscale processed image, calculates the grayscale value of each position of the image, and then calculates the deviation value from the image center reference point according to the grayscale value of different positions of the image, and then compares the calculated deviation value with the standard parameter to calculate the beam verticality and ellipticity information of the laser transmission cable; The laser transmission optical cable calibration mechanism comprises: Fixed snap ring; A plurality of calipers arranged at circumferential intervals on the fixing clamp ring for fixing the output end of the laser transmission optical cable; and First and second calibration cameras for calibrating the central axis of the output end of the fixed laser transmission optical cable; The first and second calibration cameras are arranged on a plane perpendicular to the central axis of the output end of the laser transmission optical cable, and the angle formed by the line between the center of the first calibration camera and the central axis of the output end of the laser transmission optical cable and the line between the center of the second calibration camera and the central axis of the output end of the laser transmission optical cable is 90°.

2. The laser beam verticality and spot ellipticity rapid analysis system according to claim 1, characterized in that: The central axis of the semi-transparent mask and the central axis of the output end of the laser transmission optical cable are on the same axis.

3. The laser beam verticality and spot ellipticity rapid analysis system according to claim 1, characterized in that: The translucent mask is a uniform translucent high-temperature resistant crystal plate.

4. The laser beam verticality and spot ellipticity rapid analysis system as claimed in claim 1, characterized in that: The mask driving mechanism comprises: A travel axis disposed on one side of the translucent mask and extending along the central axis direction of the translucent mask; A mask fixing base slidably sleeved on the travel shaft and connected to the translucent mask for driving the translucent mask to reciprocate along the central axis direction thereof; A travel motor which is sleeved on the travel shaft and connected to the cover plate fixing base and can slide back and forth along the axial direction of the travel shaft; and A photosensitive switch is arranged behind the semi-transparent mask and connected to the travel motor.

5. The laser beam verticality and spot ellipticity rapid analysis system as claimed in claim 1, characterized in that: The imaging mechanism is an infrared CCD camera, and the center of the infrared CCD camera and the central axis of the semi-transparent mask are on the same axis.

6. The laser beam verticality and spot ellipticity rapid analysis system as claimed in claim 1, characterized in that: The image analysis module is a finite element grayscale analysis system.

7. A method for testing a laser beam verticality and spot ellipticity rapid analysis system according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step S10, using a laser transmission optical cable calibration mechanism to fix the output end of the laser transmission optical cable, and calibrating the central axis of the output end of the laser transmission optical cable, so that the central axis of the output end of the laser transmission optical cable and the central axis of the semi-transparent mask are on the same axis; Step S20, controlling the light source to emit a laser beam, and the laser beam is irradiated onto the semi-transparent mask through the output end of the laser transmission optical cable; Step S30, the mask driving mechanism drives the semi-transparent mask to move toward the imaging mechanism; Step S40, when the semi-transparent mask passes by the proximity switch mechanism, the proximity switch mechanism is triggered to transmit a start signal to the imaging mechanism; Step S50, after the imaging mechanism receives the start signal transmitted by the proximity switch mechanism, it exposes and photographs the back side of the semi-transparent mask, and transmits the photographed image to the image analysis module; Step S60, after the image analysis module receives the image transmitted by the imaging mechanism, it performs grayscale processing on the received image, performs grayscale finite element analysis on the image after grayscale processing, calculates the grayscale value of each position of the image, and then calculates the deviation value from the image center reference point based on the grayscale values ​​of different positions of the image, and then compares the calculated deviation value with the standard parameters to calculate the beam verticality and ellipticity information of the laser transmission cable.

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