CN116793249A - Optical fiber preform bending detection device and method - Google Patents
Optical fiber preform bending detection device and method Download PDFInfo
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- CN116793249A CN116793249A CN202310624350.4A CN202310624350A CN116793249A CN 116793249 A CN116793249 A CN 116793249A CN 202310624350 A CN202310624350 A CN 202310624350A CN 116793249 A CN116793249 A CN 116793249A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 176
- 238000001514 detection method Methods 0.000 title claims abstract description 86
- 238000005452 bending Methods 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000006073 displacement reaction Methods 0.000 claims description 12
- 238000005259 measurement Methods 0.000 abstract description 10
- 230000003287 optical effect Effects 0.000 description 11
- 238000005229 chemical vapour deposition Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 238000005253 cladding Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000012792 core layer Substances 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The application provides a device and a method for detecting the curvature of an optical fiber preform, wherein the device comprises a light source, a spectroscope, a collimating objective lens, a reflecting mirror, an adjustable bridge plate and a curvature detection unit, wherein the reflecting mirror is arranged at the top of the adjustable bridge plate, and the device comprises the following components: the light rays pass through the spectroscope and the collimating objective lens to form parallel light, and the parallel light rays are received by the curvature detection unit after being reflected by the reflecting mirror; the bottom of the adjustable bridge plate is provided with a semicircular bracket, the optical fiber preform rod is horizontally arranged below the adjustable bridge plate, and the adjustable bridge plate slides to the tail end of the optical fiber preform rod along the head end of the optical fiber preform rod through the semicircular bracket; and the bending detection unit is used for obtaining the bending value of the optical fiber preform according to the obtained bending error values corresponding to the two adjacent positions when the adjustable bridge plate slides to different positions of the optical fiber preform. The application improves the detection efficiency of the bending degree of the optical fiber preform rod and realizes the accurate measurement of the bending degree of the optical fiber preform rod.
Description
Technical Field
The application relates to the technical field of optical fiber testing, in particular to an optical fiber preform bending detection device and method.
Background
In the existing optical fiber preparation process, the bending degree of a core rod produced by production equipment such as an improved chemical vapor deposition method (Modified Chemical Vapour Deposition, MCVD for short), an off-rod chemical vapor deposition method (Outside Chemical Vapour Deposition, OVD for short), an axial vapor deposition method (Vapour Phase Axial Deposition, VAD for short) and the like is larger, so that the subsequent production process, for example, the concentricity of a core layer and a cladding layer of a preform rod after a sleeve and polishing is larger, and the concentricity of an optical fiber drawn into the optical fiber through high-temperature heating is also larger, thereby influencing the geometric property of an optical fiber product, leading to scrapping of the optical fiber preform rod or the optical fiber, and the bending degree of the optical fiber preform rod after the sleeve is required to be detected as a key parameter.
The existing main detection methods of the bending degree of the optical fiber preform are two, one is to use a dial indicator, and find out the position with larger swing through rotating the optical fiber preform, and the method needs manual operation by an operator, and has the problems that the measurement accuracy is influenced by the outside, the test error is larger, the measurement efficiency is lower, and the like; the other method is to use three laser ranging pens to emit light to the center of the index plate, collect distance information between an emission point and a corresponding optical fiber preform measuring point, fit the center coordinates of the optical fiber preform corresponding to the three laser ranging pens by establishing a coordinate system model, and calculate and obtain curvature values according to the geometric relationship between the three distance information and the center coordinates.
Accordingly, there is a need for an apparatus and method for detecting bending of an optical fiber preform to solve the above problems.
Disclosure of Invention
Aiming at the problems existing in the prior art, the application provides a device and a method for detecting the bending degree of an optical fiber preform.
The application provides an optical fiber preform curvature detection device, which comprises a light source, a spectroscope, a collimating objective lens, a reflecting mirror, an adjustable bridge plate and a curvature detection unit, wherein the reflecting mirror is arranged at the top of the adjustable bridge plate, and the curvature detection unit comprises the following components:
the light source is arranged on an incident light path of the spectroscope, the reflecting light path of the spectroscope is sequentially provided with the collimating lens and the reflecting mirror, and light rays emitted by the light source pass through the spectroscope and the collimating objective lens to form parallel light and emit the parallel light to the reflecting mirror; the parallel light is reflected by the reflecting mirror, sequentially passes through the collimating lens and the spectroscope, and is received by the curvature detection unit;
the bottom of the adjustable bridge plate is provided with a semicircular bracket, the optical fiber preform rod is horizontally placed below the adjustable bridge plate, and the adjustable bridge plate slides to the tail end of the optical fiber preform rod along the head end of the optical fiber preform rod through the semicircular bracket;
and the detection surface of the bending detection unit is used for obtaining the bending value of the optical fiber perform according to the obtained bending error values corresponding to the two adjacent positions when the adjustable bridge plate slides to different positions of the optical fiber perform.
According to the optical fiber preform bending detection device provided by the application, the device further comprises a control unit, wherein the control unit is used for controlling the adjustable bridge plate to gradually slide from the head end of the optical fiber preform to the tail end of the optical fiber preform according to a preset span.
According to the optical fiber perform bending detection device provided by the application, the adjusting range of the adjustable bridge plate is 0mm to 200mm, the adjusting precision is +/-0.5 mm, and the preset span is determined according to the length of the optical fiber perform;
the semi-circular structure of the semi-circular support is an adjustable structure, wherein the diameter of the semi-circular structure is adjusted according to the diameter of the prefabricated rod.
According to the optical fiber preform bending detection device provided by the application, the device further comprises a fixing unit, wherein the fixing unit is composed of a linear guide rail and is used for fixing the optical fiber preform.
According to the optical fiber preform bending detection device provided by the application, the light source is an LED light source, and the LED light source is arranged on the three-dimensional displacement platform so as to adjust the position of the LED light source through the three-dimensional displacement platform.
According to the optical fiber preform bending detection device provided by the application, the reflectivity of the reflecting mirror is more than or equal to 80%, and the outer diameter of the mirror surface of the reflecting mirror is 20mm plus or minus 1mm.
According to the optical fiber preform bending detection device provided by the application, the focal length of the collimating objective lens is 200 mm+/-1 mm.
According to the bending detection device for the optical fiber preform, provided by the application, the bending detection unit comprises the photoelectric detector, and the resolution of the photoelectric detector is not more than 2 corner seconds.
The application also provides an optical fiber preform bending detection method based on the optical fiber preform bending detection device, which comprises the following steps:
in the process that the adjustable bridge plate slides to the tail end of the optical fiber preform along the head end of the optical fiber preform, based on a curvature detection unit, measuring to obtain a curvature error value corresponding to the adjustable bridge plate when the adjustable bridge plate is positioned at two adjacent positions of the optical fiber preform;
and determining a maximum curvature error value from the curvature error values, and obtaining the curvature value of the optical fiber preform according to the maximum curvature error value and the length of the optical fiber preform.
According to the method for detecting the bending degree of the optical fiber preform, which is provided by the application, the bending error value corresponding to the adjustable bridge plate when the adjustable bridge plate is positioned at two adjacent positions of the optical fiber preform is measured based on the bending degree detection unit, and the method comprises the following steps:
based on a photoelectric detector in the curvature detection unit, respectively acquiring first focus information and second focus information, wherein the first focus information is position information corresponding to a focus formed by parallel light reflected by a reflecting mirror, passing through a collimating lens and a spectroscope in the photoelectric detector when the adjustable bridge plate is positioned at the current position of the optical fiber perform; the second focal point information is corresponding position information of a focal point formed by parallel light reflected by a reflecting mirror, which sequentially passes through a collimating lens and a spectroscope, in the photoelectric detector when the adjustable bridge plate is positioned at the next position of the optical fiber preform;
and sliding the adjustable bridge plate along the head end of the optical fiber preform to the tail end of the optical fiber preform in a mode of end-to-end connection, dragging the bridge plate, and updating the first focus information and the second focus information to obtain focus information corresponding to different positions of the optical fiber preform so as to determine a curvature error value between two adjacent positions according to the focus information.
According to the device and the method for detecting the bending degree of the optical fiber preform, the bending degree error value corresponding to the situation that the adjustable bridge plate is positioned at two adjacent positions of the optical fiber preform is measured based on the bending degree detection unit in the process that the adjustable bridge plate slides to the tail end of the optical fiber preform along the head end of the optical fiber preform, and then the bending degree value of the optical fiber preform is obtained according to the maximum bending degree error value obtained by determination, so that the bending degree detection efficiency of the optical fiber preform is improved, and the accurate measurement of the bending degree of the optical fiber preform is realized.
Drawings
In order to more clearly illustrate the application or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the application, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a device for detecting bending of an optical fiber preform according to the present application;
FIG. 2 is a schematic flow chart of a method for detecting bending of an optical fiber preform according to the present application;
reference numerals:
101: a light source; 102: a beam splitter; 103: a collimator objective;
104: a reflecting mirror; 105: an adjustable bridge plate; 106: a curvature detection unit;
107: an optical fiber preform; 1081: a guide rail cushion block; 1082: a linear guide rail;
1083: an optical plate.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The features of the application "first", "second" may include one or more of the features either explicitly or implicitly. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," and the like indicate an orientation or a positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
In the description of the present application, 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 mechanically or electrically connected; 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 application will be understood in specific cases by those of ordinary skill in the art.
Fig. 1 is a schematic structural diagram of an optical fiber preform bending detection device provided by the present application, and as shown in fig. 1, the present application provides an optical fiber preform bending detection device, which includes a light source 101, a beam splitter 102, a collimator objective 103, a reflecting mirror 104, an adjustable bridge plate 105, a bending detection unit 106, and an optical fiber preform 107 to be detected, where the reflecting mirror 104 is installed on top of the adjustable bridge plate 105, and the application further includes:
the light source 101 is disposed on an incident light path of the beam splitter 102, a reflecting light path of the beam splitter 102 is sequentially provided with the collimating lens 103 and the reflecting mirror 104, and light rays emitted by the light source 101 pass through the beam splitter 102 and the collimating objective 103 to form parallel light rays to be emitted to the reflecting mirror 104; the parallel light is reflected by the reflecting mirror 104, sequentially passes through the collimating lens 103 and the spectroscope 102, and is received by the curvature detecting unit 106;
a semicircular bracket is installed at the bottom of the adjustable bridge plate 105, the optical fiber preform 107 is horizontally placed below the adjustable bridge plate 105, and the adjustable bridge plate 105 slides to the tail end of the optical fiber preform 107 along the head end of the optical fiber preform 107 through the semicircular bracket;
the detection surface of the bending detection unit 106 is configured to obtain a bending value of the optical fiber preform 107 according to the obtained bending error values corresponding to two adjacent positions when the adjustable bridge plate 105 slides to different positions of the optical fiber preform 107.
In the application, after the light emitted by the light source 101 is split by the spectroscope 102, the light is emitted at an angle of 90 degrees with the incident angle, and is formed into parallel light by the collimating objective 103 and then emitted to the reflector 104 above the adjustable slab bridge 105; then, the parallel light is returned to the collimator lens 103 through the reflector 104, the reflected parallel light is converged by the collimator lens 103, and is transmitted by the spectroscope 102, and then the image is formed on the detection surface of the curvature detection unit 106 of the focal plane of the collimator lens 103, in the application, the curvature detection unit 106 comprises a photoelectric detector, and the image can be realized by the photoelectric detector.
Optionally, the focal length of the collimator objective 103 is 200mm±1mm.
Optionally, the reflectivity of the reflecting mirror 104 is greater than or equal to 80%, and the outer diameter of the reflecting mirror 104 is 20mm±1mm.
Optionally, the curvature detecting unit 106 includes a photodetector, where the resolution of the photodetector is not greater than 2 angular seconds, so as to ensure a higher curvature value measurement accuracy.
In the application, the span of the adjustable bridge plate 105 is adjusted, the optical fiber preform 107 is arranged below the adjustable bridge plate 105, and the adjustable bridge plate 105 is fixed at the head end of the optical fiber preform 107 by utilizing a semicircular bracket at the bottom of the adjustable bridge plate 105; then, by turning on the light source 101, the curvature detection unit 106 obtains the light reflected by the reflector 104 above the adjustable bridge plate 105, and records corresponding detection data (for example, the detection data is marked as first detection data); further, the sliding adjustable bridge plate 105 with equal span connected end to end moves to the next position of the optical fiber perform 107, that is, the position of the front pivot of the moving adjustable bridge plate 105 coincides with the position of the rear pivot of the moving adjustable bridge plate 105, at this time, the light reflected by the reflecting mirror 104 above the adjustable bridge plate 105 is obtained again through the curvature detection unit 106, corresponding detection data (for example, the second detection data is recorded), when the optical fiber perform 107 has curvature, the reflecting mirror 104 deflects by an angle a through sliding the adjustable bridge plate 105 to different positions of the optical fiber perform 107, so that the detected image returned to the photoelectric detector generates displacement, the detected image generates Δs displacement through accurate measurement, and then curvature error values corresponding to two adjacent positions are obtained; based on the above repeated process, the detection data of the adjustable bridge plate 105 after each sliding on the optical fiber perform 107 is recorded successively until the detection data slides to the tail end of the optical fiber perform 107, and then the bending value of the optical fiber perform 107 is calculated according to the data detected each time.
Specifically, in the present application, the position of the adjustable bridge plate 105 on the optical fiber preform 107 is moved in a mode of end-to-end connection with equal span, in each moving process, based on the optical signal collected by the photodetector, the focal coordinate information corresponding to the optical signal when imaging on the detection surface of the photodetector is obtained, and then the inclination angle of each connecting line of two adjacent focuses to the optical axis can be calculated by the control and measurement software in the curvature detection unit 106, that is, the curvature error value corresponding to each two adjacent focuses is obtained by obtaining the focal distance corresponding to two adjacent positions of the optical fiber preform 107, and the curvature value of the whole optical fiber preform 107 is calculated according to the maximum curvature error value.
According to the optical fiber perform curvature detection device, the curvature error value corresponding to the situation that the adjustable bridge plate is located at two adjacent positions of the optical fiber perform is measured based on the curvature detection unit in the process that the adjustable bridge plate slides to the tail end of the optical fiber perform along the head end of the optical fiber perform, so that the curvature value of the optical fiber perform is obtained according to the maximum curvature error value obtained, the optical fiber perform curvature detection efficiency is improved, and the accurate measurement of the optical fiber perform curvature is realized.
On the basis of the above embodiment, the apparatus further comprises a control unit for controlling the adjustable bridge plate 105 to sequentially slide from the head end of the optical fiber preform 107 to the tail end of the optical fiber preform according to a preset span.
In the present application, the longitudinal span of the adjustable bridge plate 105 may be determined according to the length of the optical fiber preform 107, that is, the preset span of each movement of the adjustable bridge plate 105 is determined according to the length of the optical fiber preform 107, so that the movement of the adjustable bridge plate 105 from the head end to the tail end of the optical fiber preform 107 is completed in equal spans, and in the present application, in order to provide the accuracy of the curvature detection, the number of movements may be appropriately increased, that is, the preset span is set to a smaller value; if the detection efficiency needs to be improved, the number of movements can be reduced appropriately, i.e. the preset span is set to a larger value. It should be noted that the preset span is set according to the length of the optical fiber preform 107, and it is also ensured that the adjustable bridge plate 105 is connected end to end each time.
On the basis of the embodiment, the adjusting range of the adjustable bridge plate is 0mm to 200mm, the adjusting precision is +/-0.5 mm, and the preset span is determined according to the length of the optical fiber preform;
the semi-circular structure of the semi-circular support is an adjustable structure, wherein the diameter of the semi-circular structure is adjusted according to the diameter of the prefabricated rod.
In the present application, a pair of semi-circular brackets (i.e., semi-circular brackets) are assembled under the adjustable bridge plate 105, and when the bending degree of the optical fiber preform is detected, the adjustable bridge plate 105 is firstly fixed at the head end of the optical fiber preform 107 through the brackets, wherein the semi-circular diameter of the semi-circular brackets is determined according to the outer diameter of the optical fiber preform 107, so that the semi-circular diameter is slightly larger than the outer diameter of the optical fiber preform 107, the adjustable bridge plate 105 can be placed above the optical fiber preform 107 without sliding, and the optical fiber preform 107 supports the adjustable bridge plate 105 through the semi-circular brackets, so that the bending degree detection result is more accurate.
On the basis of the above embodiment, the apparatus further includes a fixing unit composed of a linear guide rail for fixing the optical fiber preform.
In the present application, referring to fig. 1, the fixing unit includes rail pads 1081, a linear rail 1082 and an optical flat 1083, wherein the two rail pads 1081 are fixed on the optical flat 1083, and the linear rail 1082 is fixed between the two rail pads 1081, so that the height of the linear rail 1082 is kept consistent with the height of the outer circumference of the optical fiber preform 107 by the rail pads 1081, and the linear rail 1082 is used as a leaning surface of the optical fiber preform 107, so that the optical fiber preform 107 leans against the inner side of the linear rail 1082, preventing the optical fiber preform 107 from sliding.
On the basis of the embodiment, the light source is an LED light source, and the LED light source is arranged on the three-dimensional displacement platform so as to adjust the position of the LED light source through the three-dimensional displacement platform.
In the application, the LED light source is arranged on the three-dimensional displacement platform, so that the LED light source is automatically adjusted up, down, left, right, front and back, and the centers of the spectroscope 102, the collimating objective 103, the reflecting mirror 104 and the receiving system (namely the photoelectric detector) of the bending detection unit 106 are ensured to be positioned on the same horizontal line.
Fig. 2 is a schematic flow chart of an optical fiber preform bending detection method provided by the present application, and as shown in fig. 2, the present application provides an optical fiber preform bending detection method based on the optical fiber preform bending detection device provided by the foregoing embodiments, including:
step 201, in the process that the adjustable bridge plate slides along the head end of the optical fiber perform to the tail end of the optical fiber perform, based on the curvature detection unit, the curvature error value corresponding to the position of the adjustable bridge plate when the adjustable bridge plate is positioned at two adjacent positions of the optical fiber perform is measured.
In the application, an optical fiber preform is arranged below an adjustable bridge plate, and the adjustable bridge plate is fixed at the head end of the optical fiber preform by utilizing a semicircular bracket at the bottom of the adjustable bridge plate; then, the light reflected by the reflector above the adjustable bridge plate is acquired through the curvature detection unit and recorded as first detection data; further, the sliding adjustable bridge plate with equal spans connected end to end moves to the next position of the optical fiber preform, namely, the front supporting point of the movable adjustable bridge plate coincides with the position of the rear supporting point of the movable adjustable bridge plate, at the moment, light reflected by a reflector above the adjustable bridge plate is acquired through a curvature detection unit again, the light is recorded as second detection data, when the optical fiber preform has curvature, displacement generated by the corresponding focus imaged on the detection surface of the photoelectric detector is detected, and curvature error values corresponding to two adjacent positions are further obtained; based on the repeated process, the detection data of the adjustable bridge plate after each sliding on the optical fiber perform is recorded successively.
And 202, determining a maximum curvature error value from a plurality of curvature error values, and obtaining the curvature value of the optical fiber preform according to the maximum curvature error value and the length of the optical fiber preform.
In the application, based on the optical signal collected by the photoelectric detector, the focal point coordinate information corresponding to the optical signal when imaging on the detection surface of the photoelectric detector is obtained, then the curvature error value corresponding to each two adjacent focal points is obtained by calculating the distance between each two adjacent focal points, and then the curvature value of the whole optical fiber preform is calculated according to the ratio between the maximum curvature error value and the length of the optical preform.
According to the method for detecting the bending degree of the optical fiber preform, the bending degree error value corresponding to the situation that the adjustable bridge plate is positioned at two adjacent positions of the optical fiber preform is measured based on the bending degree detection unit in the process that the adjustable bridge plate slides to the tail end of the optical fiber preform along the head end of the optical fiber preform, and then the bending degree value of the optical fiber preform is obtained according to the maximum bending degree error value obtained by determination, so that the bending degree detection efficiency of the optical fiber preform is improved, and the accurate measurement of the bending degree of the optical fiber preform is realized.
On the basis of the foregoing embodiment, the curvature error value corresponding to the position of the adjustable bridge plate when the adjustable bridge plate is located at two adjacent positions of the optical fiber preform is measured based on the curvature detection unit, including:
based on a photoelectric detector in the curvature detection unit, respectively acquiring first focus information and second focus information, wherein the first focus information is position information corresponding to a focus formed by parallel light reflected by a reflecting mirror, passing through a collimating lens and a spectroscope in the photoelectric detector when the adjustable bridge plate is positioned at the current position of the optical fiber perform; the second focal point information is corresponding position information of a focal point formed by parallel light reflected by a reflecting mirror, which sequentially passes through a collimating lens and a spectroscope, in the photoelectric detector when the adjustable bridge plate is positioned at the next position of the optical fiber preform;
and sliding the adjustable bridge plate to the tail end of the optical fiber preform along the head end of the optical fiber preform in an equal-span head-to-tail connection mode, and updating the first focal information and the second focal information to obtain focal information corresponding to different positions of the optical fiber preform so as to determine a curvature error value between two adjacent positions according to the focal information.
In the application, firstly, an optical fiber preform is fixed through a fixing unit in an optical fiber preform bending detection device, specifically, a linear guide rail is used for measuring the leaning surface of the optical fiber preform to prevent the optical fiber preform from sliding; then, an adjustable bridge plate equipped with a reflecting mirror is placed at the head end of the optical fiber preform to be measured, a semicircular bracket is arranged below the adjustable bridge plate, and the semicircular diameter of the bracket is determined according to the outer diameter of the optical fiber preform, so that the adjustable bridge plate can be placed on the optical fiber preform without sliding down.
Further, the optical axis of the optical test system is adjusted, specifically, a photoelectric detector is placed at one end of the linear guide rail (namely, one end of a reflecting light path of the reflecting mirror), and the photoelectric detector is fixed on the three-dimensional displacement platform; then, the LED light source is started, the data line is connected with the control measurement software, the reflecting mirror is regulated, and the three-dimensional displacement platform is regulated, so that the reflecting surfaces of the collimating objective lens and the reflecting mirror are regulated to be basically coaxial, and the reflected image can be normally captured by the detection surface of the photoelectric detector in the whole process.
Further, the light emitted by the LED light source is changed into plane parallel light after passing through the spectroscope and the collimating objective lens, and the plane parallel light is reflected back through the reflecting mirror on the adjustable bridge plate and is received by the photoelectric detector. According to the application, the span length of the adjustable bridge plate is adjusted according to the length of the optical fiber preform, the adjustable bridge plate is moved in a mode of equal span end-to-end connection (after each position curvature error value is measured by a control unit, the adjustable bridge plate is automatically dragged to move), and then the curvature error value is obtained according to the distance between two adjacent focuses on the detection surface of the photoelectric detector and recorded as first section data; then, the sliding adjustable bridge plate moves one span, records as second segment data, and so on, until the complete optical fiber preform is measured.
In the application, the bending value corresponding to the deflection angle of two adjacent points is calculated by controlling the measurement software, so that the bending error value Y of two adjacent points in the longitudinal direction of the whole optical fiber preform (such as the length L=2m) is obtained in the process that the adjustable bridge plate moves from the head end to the tail end of the optical fiber preform 1 、Y 2 、Y 3 、…、Y N Taking the maximum value, the bending value of the optical fiber preform is max (Y 1 、Y 2 、Y 3 、…、Y N )/L。
The application provides a method for detecting the bending degree of an optical fiber preform, which adopts a mode of moving an adjustable bridge plate in an end-to-end connection mode with equal span to realize one-time measurement of the bending degree of the optical fiber preform, and has high measurement precision; meanwhile, the whole process can realize automatic detection, the production efficiency is improved, and the whole set of detection device is simple to construct and convenient to operate.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. The utility model provides an optical fiber perform crookedness detection device, its characterized in that includes light source, spectroscope, collimation objective, speculum, adjustable bridge plate and crookedness detecting element, the speculum is installed the top of adjustable bridge plate, wherein:
the light source is arranged on an incident light path of the spectroscope, the reflecting light path of the spectroscope is sequentially provided with the collimating lens and the reflecting mirror, and light rays emitted by the light source pass through the spectroscope and the collimating objective lens to form parallel light and emit the parallel light to the reflecting mirror; the parallel light is reflected by the reflecting mirror, sequentially passes through the collimating lens and the spectroscope, and is received by the curvature detection unit;
the bottom of the adjustable bridge plate is provided with a semicircular bracket, the optical fiber preform rod is horizontally placed below the adjustable bridge plate, and the adjustable bridge plate slides to the tail end of the optical fiber preform rod along the head end of the optical fiber preform rod through the semicircular bracket;
and the detection surface of the bending detection unit is used for obtaining the bending value of the optical fiber perform according to the obtained bending error values corresponding to the two adjacent positions when the adjustable bridge plate slides to different positions of the optical fiber perform.
2. The apparatus according to claim 1, further comprising a control unit for controlling the adjustable bridge plate to gradually slide from a head end of the optical fiber preform to a tail end of the optical fiber preform according to a preset span.
3. The apparatus according to claim 2, wherein the adjustable bridge plate has an adjustment range of 0mm to 200mm, an adjustment accuracy of + -0.5 mm, and the preset span is determined according to the length of the optical fiber preform;
the semi-circular structure of the semi-circular support is an adjustable structure, wherein the diameter of the semi-circular structure is adjusted according to the diameter of the prefabricated rod.
4. The apparatus for detecting bending of an optical fiber preform according to claim 1, further comprising a fixing unit constituted by a linear guide for fixing the optical fiber preform.
5. The apparatus according to claim 1, wherein the light source is an LED light source, and the LED light source is mounted on a three-dimensional displacement platform, so that the position of the LED light source is adjusted by the three-dimensional displacement platform.
6. The apparatus according to claim 1, wherein the reflectance of the reflecting mirror is 80% or more, and the outer diameter of the mirror surface of the reflecting mirror is 20 mm.+ -. 1mm.
7. The apparatus according to claim 1, wherein the collimator objective lens has a focal length of 200mm ±1mm.
8. The apparatus according to claim 1, wherein the bending detection unit comprises a photodetector having a resolution of not more than 2 angular seconds.
9. An optical fiber preform bending detection method based on the optical fiber preform bending detection apparatus according to any one of claims 1 to 8, comprising:
in the process that the adjustable bridge plate slides to the tail end of the optical fiber preform along the head end of the optical fiber preform, based on a curvature detection unit, measuring to obtain a curvature error value corresponding to the adjustable bridge plate when the adjustable bridge plate is positioned at two adjacent positions of the optical fiber preform;
and determining a maximum curvature error value from the curvature error values, and obtaining the curvature value of the optical fiber preform according to the maximum curvature error value and the length of the optical fiber preform.
10. The method for detecting bending of an optical fiber preform according to claim 9, wherein the measuring, based on the bending detection unit, the bending error value corresponding to the adjustable bridge plate when the adjustable bridge plate is located at two adjacent positions of the optical fiber preform includes:
based on a photoelectric detector in the curvature detection unit, respectively acquiring first focus information and second focus information, wherein the first focus information is position information corresponding to a focus formed by parallel light reflected by a reflecting mirror, passing through a collimating lens and a spectroscope in the photoelectric detector when the adjustable bridge plate is positioned at the current position of the optical fiber perform; the second focal point information is corresponding position information of a focal point formed by parallel light reflected by a reflecting mirror, which sequentially passes through a collimating lens and a spectroscope, in the photoelectric detector when the adjustable bridge plate is positioned at the next position of the optical fiber preform;
and sliding the adjustable bridge plate to the tail end of the optical fiber preform along the head end of the optical fiber preform in an equal-span head-to-tail connection mode, and updating the first focal information and the second focal information to obtain focal information corresponding to different positions of the optical fiber preform so as to determine a curvature error value between two adjacent positions according to the focal information.
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