CN117190862A - Method for detecting optical fiber clamping position of optical fiber clamp - Google Patents
Method for detecting optical fiber clamping position of optical fiber clamp Download PDFInfo
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- CN117190862A CN117190862A CN202311172170.3A CN202311172170A CN117190862A CN 117190862 A CN117190862 A CN 117190862A CN 202311172170 A CN202311172170 A CN 202311172170A CN 117190862 A CN117190862 A CN 117190862A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000000835 fiber Substances 0.000 claims abstract description 39
- 238000003754 machining Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 230000001678 irradiating effect Effects 0.000 claims description 4
- 238000013507 mapping Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 4
- 238000004458 analytical method Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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Abstract
The invention provides a method for detecting the position of an optical fiber clamped by an optical fiber clamp, which comprises the following steps: s1, installing a grating, and determining the actual size corresponding to an image pixel of a camera; s2, clamping a second end of the optical fiber sample by a standard optical fiber clamp, and transmitting the acquired end face image to a control system by a camera; s3, the control system adjusts the fiber core to the center of the image; s4, taking down the standard optical fiber clamp, clamping the second end by the tested optical fiber clamp, and transmitting the acquired end face image to a control system by the camera; s5, if the measured optical fiber clamp has a machining error, the position of the fiber core in the acquired end face image deviates from the center of the image, the distance from the fiber core to the center of the image is calculated, and the deviation value is output. The method has the advantages that the grating is adopted to calibrate the image pixels, so that the accuracy of the image processing analysis result is ensured; and respectively clamping the same end of the optical fiber by using a standard optical fiber clamp and a tested optical fiber clamp, establishing a coordinate system, and obtaining core deviation data.
Description
Technical Field
The invention relates to the technical field of photoelectric detection, in particular to a method for detecting the position of an optical fiber clamped by an optical fiber clamp.
Background
The optical fiber needs to be fixed by using an optical fiber clamp in the test process, but the position of the optical fiber clamp for installing the optical fiber has errors due to the limitation of processing precision. When a high precision jig is required to position the optical fiber, it is generally prescribed that the position where the optical fiber is mounted by the optical fiber jig be within a certain error range. In the existing method for detecting the installation position of the optical fiber clamp, a standard optical fiber or an optical fiber with known parameters is installed on the optical fiber clamp to be detected, then the optical fiber is placed into a testing instrument to test the parameters of the optical fiber, and whether the optical fiber clamp meets the standard is judged according to the test value of the optical fiber; or adopting equipment capable of testing the geometric parameters of the optical fiber, installing the tested optical fiber clamp with the optical fiber on the testing equipment, and determining whether the optical fiber clamp meets the standard by observing the position of the optical fiber in the computer image. The method can not display specific deviation values of the tested optical fiber clamps, can only subjectively judge whether the tested optical fiber clamps are suitable or not, and can not select the suitable optical fiber clamps according to the test standard.
Disclosure of Invention
In view of the above-mentioned drawbacks, an object of the present invention is to provide a method for detecting a position of an optical fiber clamped by an optical fiber clamp, so as to obtain an accurate deviation value.
The invention provides a method for detecting the position of an optical fiber clamped by an optical fiber clamp, which comprises the following steps:
s1, installing a grating, and carrying out image acquisition and measurement on the grating spacing of the grating by a camera through an objective lens to determine the actual size corresponding to the image pixels of the camera;
s2, fixing a first end of an optical fiber sample at a position A, clamping a second end of the optical fiber sample by a standard optical fiber clamp, irradiating the first end by adopting a parallel light source, amplifying an end face image of the second end by the objective lens, and mapping the amplified end face image onto the camera, and transmitting the acquired end face image to a control system by the camera;
s3, analyzing the position of the fiber core and the definition of the edge contour in the end face image by the control system, driving the standard fiber clamp to move by the control driving part, adjusting the fiber core to the center of the image, and marking the position of the standard fiber clamp as a position B;
s4, taking down the standard optical fiber clamp, clamping the second end by the tested optical fiber clamp, ensuring that the first end is at a position A, ensuring that the tested optical fiber clamp is at a position B, irradiating the first end by adopting a parallel light source, amplifying an end face image of the second end by the objective lens, mapping the end face image onto the camera, and transmitting the acquired end face image to a control system by the camera;
s5, if the measured optical fiber clamp has a machining error, the position of the fiber core in the acquired end face image deviates from the center of the image, the distance from the fiber core to the center of the image is calculated, and a deviation value is output.
Preferably, the method further comprises step S6: and classifying the tested optical fiber clamps according to the requirements of optical fiber testing equipment.
Preferably, the grating comprises a longitudinal grating and a transverse grating.
Preferably, the optical fiber sample is obtained by cutting an optical fiber.
Preferably, the driving part drives the base to move, and the standard optical fiber clamp, the tested optical fiber clamp and the base are detachably connected.
Preferably, iron sheets are arranged at the bottoms of the standard optical fiber clamp and the tested optical fiber clamp, and a magnet is arranged on the base.
Preferably, in the step S5, a coordinate system is established with the center of the image as the origin, and the offset value includes an x-axis coordinate value and a y-axis coordinate value, and the offset direction is represented by a sign.
The method has the advantages that the grating is adopted to calibrate the image pixels, so that the accuracy of the image processing analysis result is ensured; and respectively clamping the same end of the optical fiber by using a standard optical fiber clamp and a tested optical fiber clamp, establishing a coordinate system, acquiring fiber core deviation data, and accurately classifying the tested optical fiber clamp, thereby selecting different optical fiber clamps for use according to different test standards.
Drawings
FIG. 1 is a schematic diagram of the relative positions of a grating, an objective lens and a camera;
FIG. 2 is a raster image acquired by a camera;
FIG. 3 is a schematic illustration of a fiber sample clamped using a standard fiber clamp;
FIG. 4 is an end face image obtained when clamping a fiber sample using a standard fiber clamp;
FIG. 5 is a schematic illustration of clamping a fiber sample using a fiber clamp under test;
fig. 6 is an end face image obtained when the optical fiber sample is clamped using the measured optical fiber clamp.
Description of element numbers:
1. parallel light source
2. Grating
21. Longitudinal grid
22. Transverse grid
3. Objective lens
4. Camera head
5. Background
6. Optical fiber sample
61. Fiber core
7. Drive unit
8. Base seat
81. Magnet
82. Background board
91. Standard optical fiber clamp
92. Tested optical fiber clamp
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to be limiting.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Fig. 1 is a schematic diagram of the relative positions of the grating, the objective lens and the camera, and in the following description, the reference basis of the direction in fig. 1 is taken as the reference basis, the direction is upward along the view paper, downward along the view paper, rightward along the view paper, forward along the view paper, leftward and rearward along the view paper, outward and leftward perpendicular to the paper, and inward and rightward perpendicular to the paper.
The invention provides a method for detecting the position of an optical fiber clamped by an optical fiber clamp, which comprises the following steps:
s1, as shown in FIG. 1, a grating 2 is arranged at the rear side of an objective lens 3, a parallel light source 1 is arranged at the rear side of the grating 2, the parallel light source 1 emits parallel light beams, and a camera 4 acquires and measures the grid spacing of the grating 2 through the objective lens 3 and transmits the images to a control system. As shown in fig. 2, the grating 2 includes a longitudinal grating and a transverse grating, and the acquired image includes a background 5 and a longitudinal grating 21 and a transverse grating 22 on the background 5, wherein the grid pitch of the longitudinal grating 21 is x ', and the grid pitch between the transverse gratings 22 is y'. The control system analyzes the grid spacing, determines the actual size corresponding to the image pixels of the camera 4, and completes the calibration of the image pixels.
S2, as shown in fig. 3, one end of the optical fiber is fixed, the other end of the optical fiber is held by a standard optical fiber holder 91, and then the optical fiber is cut by an optical fiber cutter, thereby forming an optical fiber sample 6. The first end of the fiber sample 6 is fixed at position a and the standard fiber clamp 91 clamps the second end of the fiber sample 6. The standard optical fiber clamp 91 herein specifically refers to an optical fiber clamp that has been inspected by an optical device to confirm that its clamping position meets the test requirements. The distance from the second end to the standard fiber clamp 91 may be adjusted based on the fiber test equipment test distance. The driving unit 4 can drive the standard optical fiber holder 91 to move up and down, left and right, and back and forth. The first end is irradiated by the parallel light source 1, the end face image of the second end is amplified by the objective lens 3 and then mapped onto the camera 4, and the camera 4 transmits the acquired end face image to the control system.
S3, as shown in FIG. 4, the control system analyzes the position of the fiber core 61 and the definition of the edge contour in the end face image, and the control driving part 4 drives the standard fiber clamp 91 to move, adjusts the fiber core 61 to the center of the image and the most clear focusing position, and marks the position of the standard fiber clamp 91 as a position B.
S4, as shown in FIG. 5, the standard optical fiber clamp 91 is removed, the second end is clamped by the tested optical fiber clamp 92, the first end is ensured to be at the position A, the tested optical fiber clamp 92 is ensured to be at the position B, then the parallel light source 1 is adopted to irradiate the first end, the end face image of the second end is amplified by the objective lens 3 and then mapped onto the camera 4, and the camera 4 transmits the acquired end face image to the control system.
S5, if the measured optical fiber clamp 92 has a machining error, the position of the fiber core 61 deviates from the center of the image in the acquired end face image as shown in FIG. 6. The distance from the fiber core 61 to the center of the image is calculated by combining the pixel ratio of the camera 7 and the ratio of the pixel to the actual physical size, a coordinate system is established by taking the center of the image as the origin, a deviation value is output, the deviation value comprises an x-axis coordinate value and a y-axis coordinate value, and the deviation direction is represented by a sign.
S6, classifying the tested optical fiber clamps 92 according to the requirements of the optical fiber testing equipment.
Further, in order to facilitate the disassembly and assembly of the standard optical fiber clamp 91 and the tested optical fiber clamp 92, the driving part 4 drives the base 8 to move, and the standard optical fiber clamp 91, the tested optical fiber clamp 92 and the base 8 are detachably connected. The detachable connection is not limited, and a bolt and nut, a buckle and a slot can be adopted, or in a specific embodiment adopted by the invention, iron sheets are arranged at the bottoms of the standard optical fiber clamp 91 and the tested optical fiber clamp 92, and a magnet 81 is arranged on the base 8, so that the iron sheets and the magnet 81 are magnetically attracted.
A background plate 82 is further provided on the base 8, and the second end of the optical fiber sample 6 penetrates the background plate 82. The background plate 82 is preferably covered with a reflective coating that reflects ambient light and forms a background light source behind the second end of the fiber sample 6 to clearly show the edge profile of the fiber sample 6 in the background 5 of the image.
It should be noted that, the form of the control system adopted in the present invention is not limited, and the existing technologies such as PLC controller or single chip microcomputer can be adopted, and the technologies of image processing analysis and calculation performed by the control system are all the existing technologies that can be implemented by those skilled in the art, and are not described herein again.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (7)
1. A method of detecting the position of an optical fiber held by an optical fiber holder, comprising the steps of:
s1, installing a grating, and carrying out image acquisition and measurement on the grating spacing of the grating by a camera through an objective lens to determine the actual size corresponding to the image pixels of the camera;
s2, fixing a first end of an optical fiber sample at a position A, clamping a second end of the optical fiber sample by a standard optical fiber clamp, irradiating the first end by adopting a parallel light source, amplifying an end face image of the second end by the objective lens, and mapping the amplified end face image onto the camera, and transmitting the acquired end face image to a control system by the camera;
s3, analyzing the position of the fiber core and the definition of the edge contour in the end face image by the control system, driving the standard fiber clamp to move by the control driving part, adjusting the fiber core to the center of the image, and marking the position of the standard fiber clamp as a position B;
s4, taking down the standard optical fiber clamp, clamping the second end by the tested optical fiber clamp, ensuring that the first end is at a position A, ensuring that the tested optical fiber clamp is at a position B, irradiating the first end by adopting a parallel light source, amplifying an end face image of the second end by the objective lens, mapping the end face image onto the camera, and transmitting the acquired end face image to a control system by the camera;
s5, if the measured optical fiber clamp has a machining error, the position of the fiber core in the acquired end face image deviates from the center of the image, the distance from the fiber core to the center of the image is calculated, and a deviation value is output.
2. The method according to claim 1, further comprising step S6: and classifying the tested optical fiber clamps according to the requirements of optical fiber testing equipment.
3. The method of claim 1, wherein the grating comprises a longitudinal grating and a transverse grating.
4. The method of claim 1, wherein the fiber sample is obtained by cleaving an optical fiber.
5. The method of claim 1, wherein the drive portion drives the base to move, and wherein the standard fiber clamp, the tested fiber clamp, and the base are detachably connected.
6. The method of claim 5, wherein the bottom of the standard optical fiber clamp and the tested optical fiber clamp are provided with iron sheets, and the base is provided with a magnet.
7. The method according to claim 1, wherein in the step S5, a coordinate system is established with the center of the image as the origin, and the offset value includes an x-axis value and a y-axis value, and the offset direction is represented by a sign.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311172170.3A CN117190862A (en) | 2023-09-11 | 2023-09-11 | Method for detecting optical fiber clamping position of optical fiber clamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311172170.3A CN117190862A (en) | 2023-09-11 | 2023-09-11 | Method for detecting optical fiber clamping position of optical fiber clamp |
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| CN117190862A true CN117190862A (en) | 2023-12-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118067015A (en) * | 2024-04-18 | 2024-05-24 | 钛玛科（北京）工业科技有限公司 | Width measuring system based on embedded linear array camera |
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2023
- 2023-09-11 CN CN202311172170.3A patent/CN117190862A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118067015A (en) * | 2024-04-18 | 2024-05-24 | 钛玛科（北京）工业科技有限公司 | Width measuring system based on embedded linear array camera |
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