Tapered optical fiber on-line marking device and marking control method

Abstract

The present application relates to the technical field of optical fiber processing, and provides a tapered optical fiber online marking device and a marking control method.The online marking device comprises a first diameter measuring unit, a marking unit and a control unit;the first diameter measuring unit is used for continuously detecting the diameter information of the bare fiber of the tapered optical fiber according to a preset interval time;the marking unit is arranged on the front side of the first diameter measuring unit along the conveying direction of the tapered optical fiber and is used for setting the mark on the surface of the tapered optical fiber;and the control unit is used for calculating the taper change coefficient of the tapered optical fiber according to the diameter information, determining the variable taper starting point and the variable taper ending point of the tapered optical fiber according to the taper change coefficient, and controlling the marking unit to set the first mark at the variable taper starting point and the second mark at the variable taper ending point.The present application can accurately identify the variable taper starting point and the variable taper ending point of the tapered optical fiber, improve the marking accuracy, ensure the marking efficiency, and meet the customer demand.

Description

Technical Field

[0001] This invention relates to the field of optical fiber processing technology, and in particular to an online marking device and marking control method for tapered optical fibers. Background Technology

[0002] Tapered fiber, as a type of fiber with a graded core diameter, can solve the nonlinear problems arising at ultra-high power while maintaining excellent beam quality. Tapered fiber consists of a narrow section, a tapered section, and a wide section, which are connected sequentially along the axial direction. In other words, tapered fiber has a wide end and a narrow end. When using tapered fiber, the wide and narrow ends need to be marked to clearly define the splicing area.

[0003] Currently, the thick and thin ends of tapered optical fibers are commonly marked manually. Since the diameter of the optical fiber is relatively small, a microscope or other magnifying instruments are needed to assist in observation during marking. This marking method is time-consuming and labor-intensive, and errors are prone to occur in actual operation.

[0004] In related technologies, inkjet printers are used for online automatic marking of tapered optical fibers to improve marking efficiency. The inkjet printer determines the start and end points of the thinner or thicker sections of the tapered fiber based on abrupt changes in the diameter of the bare fiber as measured by a diameter gauge. Different colors are sprayed at the start and end points of these sections, allowing users to identify the thicker and thinner ends of the fiber. While this marking method is more efficient than manual marking, during fiber drawing, the fiber's diameter often changes abruptly due to vibrations or defects in the preform itself. These abrupt changes are irregular, random, and deviate from the normal diameter range, leading to measurement errors. Given these measurement errors, it is difficult to accurately determine the start and end points of the thinner and thicker sections of the tapered fiber based on these abrupt changes, resulting in incorrect marking. Summary of the Invention

[0005] This invention provides an online marking device and marking control method for tapered optical fibers, which can at least solve or improve the current problem of difficulty in accurately marking tapered optical fibers.

[0006] In a first aspect, the present invention provides an online marking device for a tapered optical fiber, comprising:

[0007] The first diameter measuring unit is used to continuously detect the diameter information of the bare fiber of the tapered optical fiber at preset intervals.

[0008] A marking unit is disposed on the front side of the first diameter measuring unit along the conveying direction of the tapered optical fiber, and is used to set a mark on the surface of the tapered optical fiber;

[0009] The control unit is configured to calculate the taper variation coefficient of the tapered optical fiber based on the diameter information, determine the taper start point and taper end point of the tapered optical fiber based on the taper variation coefficient, and control the marking unit to set a first identifier at the taper start point and a second identifier at the taper end point.

[0010] According to the present invention, an online marking device for tapered optical fibers includes a step of determining the tapering start point and tapering end point of the optical fiber based on the tapering variation coefficient, comprising:

[0011] The taper variation coefficient K is equal to K 标1 When the taper variation coefficient K equals K, determine the starting point of the tapered change; 标2 At that time, determine the end point of the variable cone;

[0012] Among them, K 标1 K represents the taper of the tapered section of a tapered optical fiber. 标2 It is zero.

[0013] According to the present invention, a tapered optical fiber online marking device is provided, wherein the taper variation coefficient K = |(Dt)| n+1 -Dt n ) / (Lt n+1 -Lt n )|;

[0014] Among them, Dt n+1 For the bare fiber of the tapered optical fiber at t n+1 The diameter at time, Dt n For the bare fiber of the tapered optical fiber at t n The diameter of time, Lt n+1 For the tapered optical fiber at t n+1 The take-up length at any given time, Lt n For the tapered optical fiber at t n The length of the wire taken up at any given moment.

[0015] According to the present invention, an online marking device for tapered optical fibers includes a step of controlling the marking unit to set a first mark at the tapered starting point, comprising:

[0016] Obtain the axial distance L between the first diameter measuring unit and the marking unit, and the taper of the optical fiber when the taper variation coefficient K is equal to K. 标1 The take-up length L1 at the moment;

[0017] When the drawing stroke of the tapered optical fiber is the sum of the axial distance L and the take-up length L1, the marking unit is controlled to set the first mark on the surface of the tapered optical fiber.

[0018] According to the present invention, an online marking device for a tapered optical fiber includes a step of controlling the marking unit to set a second mark at the tapered end point, comprising:

[0019] Obtain the axial distance L between the first diameter measuring unit and the marking unit, and the taper of the optical fiber when the taper variation coefficient K is equal to K. 标2 The take-up length L2 at the moment;

[0020] When the drawing stroke of the tapered optical fiber is the sum of the axial distance L and the take-up length L2, the marking unit is controlled to set the second mark on the surface of the tapered optical fiber.

[0021] According to the present invention, a tapered optical fiber online marking device is provided, wherein the first mark is a first color mark, the second mark is a second color mark, and the colors marked by the first color mark and the second color mark are different.

[0022] According to the present invention, a tapered optical fiber online marking device further includes: a preform clamp, a drawing furnace, a coating and curing unit, a traction unit, and a fiber take-up unit;

[0023] The preformed rod clamp, the drawing furnace, the first diameter measuring unit, the coating and curing unit, the marking unit, the traction unit, and the fiber take-up unit are arranged in sequence and are electrically connected to the control unit respectively.

[0024] The preform clamp is used to hold the optical fiber preform and control the optical fiber preform to extend towards the drawing furnace; the drawing furnace is used to control the drawing temperature of the optical fiber preform; the traction unit is used to control the drawing speed of the tapered optical fiber; and the fiber take-up unit is used to perform a take-up operation on the tapered optical fiber.

[0025] According to the present invention, a tapered optical fiber online marking device further includes: a second diameter measuring unit;

[0026] The second diameter measuring unit is located between the coating and curing unit and the marking unit, and is electrically connected to the control unit;

[0027] The second diameter measuring unit is used to detect the diameter information of the tapered optical fiber, and the control unit is used to determine the finished quality of the tapered optical fiber based on the diameter information fed back by the second diameter measuring unit.

[0028] In a second aspect, the present invention also provides a marking control method for the tapered optical fiber online marking device as described above, comprising:

[0029] The diameter information of the bare fiber of the tapered optical fiber is continuously acquired at preset intervals.

[0030] Based on the diameter information, calculate the taper variation coefficient of the tapered optical fiber;

[0031] The taper variation coefficient is used to determine the taper start point and taper end point of the tapered optical fiber;

[0032] The control marking unit sets a first mark at the starting point of the tapered section and a second mark at the ending point of the tapered section;

[0033] The first identifier and the second identifier are different.

[0034] According to a marking control method provided by the present invention, the step of determining the taper start point and taper end point of the tapered optical fiber based on the taper variation coefficient includes:

[0035] The taper variation coefficient K is equal to K 标1 When the taper variation coefficient K equals K, determine the starting point of the tapered change; 标2 At that time, determine the end point of the variable cone;

[0036] Among them, K 标1 K represents the taper of the tapered section of a tapered optical fiber. 标2 It is zero.

[0037] According to a marking control method provided by the present invention, the method further includes: if the diameter information matches the diameter of the narrow section of the tapered optical fiber, after controlling the marking unit to mark the first mark, the method further controls the marking unit to set a third mark on one side of the tapered starting point;

[0038] If the diameter information matches the diameter of the coarse section of the tapered optical fiber, after controlling the marking unit to mark the first mark, the marking unit is also controlled to set a fourth mark on one side of the tapered starting point.

[0039] The online marking device and marking control method for tapered optical fibers provided by this invention, by setting up a first diameter measuring unit, a marking unit, and a control unit, can continuously detect the taper change coefficient of the tapered optical fiber based on the diameter information of the bare fiber continuously fed back by the first diameter measuring unit. Then, combined with the structural characteristics of the tapered optical fiber, it can identify the abrupt change points where the diameter of the bare fiber changes from large to small or from small to large, thereby quickly and accurately finding the starting point and ending point of the tapering change of the tapered optical fiber, and then marking the starting point and ending point of the tapering change differently.

[0040] As can be seen from the above, the marking method shown in this invention is based on the judgment of multiple online data, which reduces the misjudgment caused by fiber optic shaking or defects in the preform itself on the mutation point. It can effectively eliminate the influence of a single abnormal data on the recognition result, improve the marking accuracy, and ensure marking efficiency, thus meeting customer needs. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the structure of the tapered optical fiber online marking device provided by the present invention;

[0043] Figure 2 This is a schematic diagram of the distribution of the first and second identifiers on the surface of the tapered optical fiber provided by the present invention;

[0044] Figure 3 This is a flowchart illustrating the marking control method of the tapered optical fiber online marking device provided by the present invention;

[0045] Figure label:

[0046] 1. Fiber drawing tower; 2. Precast rod clamp; 3. Fiber drawing furnace; 4. First diameter measuring unit; 5. Coating and curing unit; 6. Second diameter measuring unit; 7. Marking unit; 8. Traction unit; 81. Reversing wheel; 82. Traction wheel set; 9. Fiber take-up unit;

[0047] 100. Control unit; 10. Optical fiber preform; 20. Tapered optical fiber; 201. Narrow diameter section; 202. Variable taper section; 203. Wide diameter section; 301. First identifier; 302. Second identifier; 303. Third identifier; 304. Fourth identifier. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0049] The following is combined Figures 1-3The present invention will provide a detailed description of the tapered optical fiber online marking device and marking control method provided in the embodiments of the present invention through specific implementation examples and application scenarios.

[0050] In the first aspect, such as Figure 1 and Figure 2 As shown, an embodiment of the present invention provides an online marking device for tapered optical fibers, comprising:

[0051] The first diameter measuring unit 4 is used to continuously detect the diameter information of the bare fiber of the tapered optical fiber 20 at preset intervals.

[0052] The marking unit 7 is located on the front side of the first diameter measuring unit 4 along the conveying direction of the tapered optical fiber 20, and is used to set a mark on the surface of the tapered optical fiber 20.

[0053] The control unit 100 is used to calculate the taper change coefficient of the tapered optical fiber 20 based on the diameter information, determine the taper change start point and taper change end point of the tapered optical fiber 20 based on the taper change coefficient, and control the marking unit 7 to set a first mark 301 at the taper change start point and a second mark 302 at the taper change end point.

[0054] Understandably, the first diameter measuring unit 4 is electrically connected to the control unit 100, and the control unit 100 is electrically connected to the marking unit 7.

[0055] The first diameter measuring unit 4 and the marking unit 7 are respectively disposed on one side of the tapered optical fiber 20. The first diameter measuring unit 4 can be a diameter measuring instrument, the control unit 100 can be a microprocessor, and the marking unit 7 can be a marking machine, such as a line marking spraying machine. This allows the marking unit 7 to set markings on the surface of the tapered optical fiber 20 by spraying.

[0056] Furthermore, such as Figure 1 As shown, the tapered optical fiber online marking device also includes: a preform clamp 2, a drawing furnace 3, a coating and curing unit 5, a traction unit 8, and a fiber take-up unit 9.

[0057] The preform clamp 2, drawing furnace 3, first diameter measuring unit 4, coating and curing unit 5, marking unit 7, traction unit 8, and fiber take-up unit 9 are arranged sequentially and electrically connected to the control unit 100. In this way, the working status of the preform clamp 2, drawing furnace 3, coating and curing unit 5, marking unit 7, traction unit 8, and fiber take-up unit 9 can be controlled by the control unit 100.

[0058] Specifically, the preform clamp 2 is movably mounted on the drawing tower 1 in the vertical direction. The preform clamp 2 is positioned above the drawing furnace 3. The preform clamp 2 is used to clamp the optical fiber preform 10 and can drive the optical fiber preform 10 to move up and down in the axial direction, thereby controlling the optical fiber preform 10 to extend into the drawing furnace 3 and realizing the feeding control of the optical fiber preform 10.

[0059] The drawing furnace 3 is used to control the drawing temperature of the optical fiber preform 10, and draws the optical fiber preform 10 into a tapered optical fiber inside the drawing furnace 3. A first diameter measuring unit 4, a coating and curing unit 5, and a marking unit 7 are sequentially arranged on the lower side of the drawing furnace 3. The coating and curing unit 5 includes a coating component and a curing component. The coating component is used to apply a coating layer to the surface of the bare fiber output from the drawing furnace 3. The curing component can use an ultraviolet curing lamp to irradiate the coating layer, thereby completing the drying and curing of the coating layer.

[0060] The traction unit 8 is used to control the drawing speed of the tapered optical fiber 20. The traction unit 8 includes a reversing wheel 81 and a traction wheel group 82. After being marked by the marking unit 7, the tapered optical fiber 20 is first wound around the reversing wheel 81, then passed through the traction wheel group 82, and finally wound around the fiber take-up unit 9. The fiber take-up unit 9 performs a take-up operation on the tapered optical fiber 20.

[0061] The reversing wheel 81 changes the tapered optical fiber 20, which is being drawn, from a vertical to a horizontal transport state, so that it can be wound up on the ground. The traction wheel assembly 82 includes at least two traction wheels, which provide driving force for transporting the tapered optical fiber 20. The fiber take-up unit 9 includes a reel and a drive motor, which is connected to the reel to drive the reel to rotate. The reel is used to store and wind the tapered optical fiber 20.

[0062] In practical applications, during the drawing process of the tapered optical fiber 20 through the drawing tower, the first diameter measuring unit 4 continuously detects the diameter of the bare fiber of the tapered optical fiber 20 at preset intervals. The preset intervals can be 0.5-2.5s, such as 0.5s, 1s, 2s and 2.5s.

[0063] Based on the diameter information fed back by the first diameter measuring unit 4, the control unit 100 can calculate a set of taper variation coefficients, that is, continuously detect the taper variation coefficients of the tapered optical fiber 20.

[0064] like Figure 2As shown, the tapered optical fiber 20 includes a narrow diameter section 201, a variable taper section 202, and a wide diameter section 203. The narrow diameter section 201, the variable taper section 202, and the wide diameter section 203 are connected sequentially along the axial direction. The narrow diameter section 201 and the wide diameter section 203 are both cylindrical, and their corresponding taper variation coefficients are zero. The variable taper section 202 is shaped like a truncated cone, and its corresponding taper variation coefficient is a set value greater than zero.

[0065] Thus, based on a set of calculated taper variation coefficients, the control unit 100 can accurately identify the abrupt change points where the diameter of the bare fiber decreases or increases, thereby obtaining the taper start point and taper end point of the tapered optical fiber 20. Subsequently, the control unit 100 can specifically control the marking unit 7 to set a first identifier 301 at the taper start point and a second identifier 302 at the taper end point to distinguish between the taper start point and the taper end point, making it easier for users to identify.

[0066] The first identifier 301 and the second identifier 302 can be either color identifiers or physical shape identifiers, and there is no limitation on this, as long as the content identified by the first identifier 301 and the second identifier 302 is different, so that the user can identify them with the naked eye.

[0067] In this embodiment, by setting up a first diameter measuring unit 4, a marking unit 7, and a control unit 100, the taper change coefficient of the tapered optical fiber 20 can be continuously detected based on the diameter information of the bare fiber continuously fed back by the first diameter measuring unit 4. Combined with the structural characteristics of the tapered optical fiber 20, the abrupt change points where the diameter of the bare fiber changes from large to small or from small to large can be identified, thereby quickly and accurately finding the taper start point and taper end point of the tapered optical fiber 20, and then distinguishably marking the taper start point and taper end point.

[0068] As can be seen from the above, compared with existing manual marking or online marking designs based on inkjet devices, the marking method shown in this invention is based on the judgment of multiple online data, which reduces the misjudgment caused by fiber optic shaking or defects in the preform itself on the mutation point, and can effectively eliminate the influence of a single abnormal data on the recognition result. While improving the marking accuracy, it also ensures the marking efficiency and meets customer needs.

[0069] In some embodiments, such as Figure 2 As shown, the steps for determining the starting and ending points of the tapered optical fiber 20 based on the taper variation coefficient include:

[0070] When the taper variation coefficient K equals K 标1 At that time, determine the starting point of the tapered change; when the taper variation coefficient K equals K 标2 At that time, determine the endpoint of the cone-shaped curve; where K 标1 K represents the taper of the tapered section 202 of the tapered optical fiber 20.标2 It is zero.

[0071] Understandably, the taper variation coefficient K = |(Dt) n+1 -Dt n ) / (Lt n+1 -Lt n )|;

[0072] In the above formula, Dt n+1 For the bare fiber of tapered optical fiber 20 at t n+1 The diameter at time, Dt n For the bare fiber of tapered optical fiber 20 at t n The diameter of time, Lt n+1 For tapered optical fiber 20 at t n+1 The take-up length at any given time, Lt n For tapered optical fiber 20 at t n The length of the wire taken up at time n, where n is a natural number greater than 0.

[0073] Among them, Lt n+1 This can also be understood as the time from the start of fiber drawing of the tapered fiber 20 to t. n+1 The cumulative take-up length over time, Lt n This can also be understood as the time from the start of fiber drawing of the tapered fiber 20 to t. n The cumulative take-up length over time, Lt n+1 and Lt n All of these can be calculated based on the winding parameters of the fiber take-up unit 9.

[0074] At the same time, because the tapered section 202 of the tapered optical fiber 20 is shaped like a frustum of a cone, K 标1 It can be obtained using the following formula:

[0075] K 标1 =(D 粗 -D 细 ) / L 锥区长度 , where D 粗 The diameter of the coarse-diameter section 203 of the tapered optical fiber 20, D 细 The diameter L of the narrow section 201 of the tapered optical fiber 20. 锥区长度 The axial length of the tapered section 202 of the tapered optical fiber 20.

[0076] Since the tapered optical fiber 20 is drawn vertically from top to bottom on the drawing tower, and the first diameter measuring unit 4 is fixedly set on one side of the tapered optical fiber 20, if two adjacent times (e.g., t) n and t n+1 At any given time, the taper variation coefficient K is determined to be equal to K. 标1If the data of the taper change coefficient K obtained from the two calculations both meet the requirements, it can be determined that the taper of the tapered fiber 20 has started to change. At this time, the previous moment is taken as the starting moment of the taper change, that is, the position of the tapered fiber 20 when the taper change coefficient K is obtained for the first time is taken as the starting point of the taper change, and the first mark 301 is applied to this point.

[0077] Correspondingly, if two adjacent times (e.g., t) n and t n+1 If the taper change coefficient K is determined to be equal to 0 at both times, and the data of the taper change coefficient K obtained in the two calculations meet the requirements, it can be determined that the taper of the tapered fiber 20 has changed again. At this time, the previous time is taken as the end time of the taper change, that is, the position of the tapered fiber 20 when the taper change coefficient K was first obtained is the end point of the taper change, and the second mark 302 is applied to this point.

[0078] In some embodiments, the step of setting a first identifier 301 at the starting point of the tapered cone by the control marking unit 7 shown in this embodiment includes:

[0079] Obtain the axial distance L between the first diameter measuring unit 4 and the marking unit 7, and the taper of the tapered optical fiber 20 when the taper coefficient K is equal to K. 标1 The take-up length L1 at the moment;

[0080] When the drawing stroke of the tapered optical fiber 20 is the sum of the axial distance L and the take-up length L1, the control marking unit 7 sets a first mark 301 on the surface of the tapered optical fiber 20.

[0081] Accordingly, the step of setting the second identifier 302 at the end point of the tapered cone by the control marking unit 7 shown in this embodiment includes:

[0082] Obtain the axial distance L between the first diameter measuring unit 4 and the marking unit 7, and the taper of the tapered optical fiber 20 when the taper coefficient K is equal to K. 标2 The take-up length L2 at the moment;

[0083] When the drawing stroke of the tapered optical fiber 20 is the sum of the axial distance L and the take-up length L2, the control marking unit 7 sets a second mark 302 on the surface of the tapered optical fiber 20.

[0084] like Figure 1 As shown, the first diameter measuring unit 4 and the marking unit 7 are respectively fixed on one side of the vertically distributed tapered optical fiber 20, and the first diameter measuring unit 4 is located on the upper side of the marking unit 7. The axial distance L between the first diameter measuring unit 4 and the marking unit 7 is the difference between the elevation of the first diameter measuring unit 4 and the elevation of the marking unit 7.

[0085] At the same time, the take-up length L1 can be controlled by the take-up unit 9 at the initial moment of drawing, and the taper variation coefficient K is equal to K. 标1 The cumulative winding angle between moments is calculated. Thus, when the drawing stroke of the tapered optical fiber 20 is the sum of the axial distance L and the winding length L1, the tapering starting point moves exactly to the position corresponding to the marking unit 7. At this time, the control unit 100 issues a control command to control the marking unit 7 to perform the first marking 301 marking operation on the tapered optical fiber 20.

[0086] Accordingly, the take-up length L2 can be determined by the take-up unit 9 at the initial moment of drawing and when the taper variation coefficient K is equal to K. 标2 The cumulative winding angle between moments is calculated. Thus, when the drawing stroke of the tapered optical fiber 20 is the sum of the axial distance L and the winding length L2, the tapering end point moves exactly to the position corresponding to the marking unit 7. At this time, the control unit 100 issues a control command to control the marking unit 7 to perform the second marking 302 marking operation on the tapered optical fiber 20.

[0087] In some embodiments, such as Figure 2 As shown, the first identifier 301 is the first color identifier, and the second identifier 302 is the second color identifier. The colors identified by the first color identifier and the second color identifier are different. For example, the color identified by the first color identifier is blue, and the color identified by the second color identifier is red; of course, the color identified by the first color identifier can also be black, and the color identified by the second color identifier can also be purple, and so on.

[0088] In some embodiments, in order to realize online detection of the drawing quality of the tapered optical fiber 20, the tapered optical fiber online marking device of this embodiment further includes: a second diameter measuring unit 6; the second diameter measuring unit 6 is disposed between the coating and curing unit 5 and the marking unit 7, and is electrically connected to the control unit 100;

[0089] The second diameter measuring unit 6 is used to detect the diameter information of the tapered optical fiber 20, and the control unit 100 is used to determine the finished quality of the tapered optical fiber 20 based on the diameter information fed back by the second diameter measuring unit 6. The second diameter measuring unit 6 can be a diameter measuring instrument.

[0090] In the second aspect, such as Figure 3 As shown, this embodiment of the invention also provides a marking control method for the tapered optical fiber online marking device as described above, comprising the following steps:

[0091] Step 310: Continuously acquire the diameter information of the bare fiber of the tapered optical fiber 20 at preset intervals;

[0092] Step 320: Calculate the taper variation coefficient of the tapered optical fiber 20 based on the diameter information;

[0093] Step 330: Determine the starting point and ending point of the tapered optical fiber 20 based on the taper variation coefficient;

[0094] Step 340: The control marking unit 7 sets a first mark 301 at the starting point of the cone change and a second mark 302 at the ending point of the cone change.

[0095] The steps for determining the starting and ending points of the tapered optical fiber 20 based on the taper variation coefficient include:

[0096] When the taper variation coefficient K equals K 标1 At that time, determine the starting point of the tapered change; when the taper variation coefficient K equals K 标2 At that time, determine the end point of the cone change;

[0097] Among them, K 标1 K represents the taper of the tapered section 202 of the tapered optical fiber 20. 标2 It is zero.

[0098] In some embodiments, such as Figure 2 As shown, the tag control method also includes:

[0099] If the diameter information of the bare fiber matches the diameter of the narrow section 201 of the tapered optical fiber 20, after the control marking unit 7 marks the first mark 301, the control marking unit 7 also sets a third mark 303 on one side of the tapered starting point.

[0100] If the diameter information of the bare fiber matches the diameter of the coarse diameter section 203 of the tapered optical fiber 20, after the control marking unit 7 marks the first mark 301, the control marking unit 7 also sets a fourth mark 304 on one side of the tapered starting point.

[0101] Understandably, based on the combination of the first identifier 301 and the third identifier 303, the inspector can accurately identify the taper point between the thin-diameter section 201 and the variable-tapered section 202 of the tapered optical fiber 20; based on the combination of the second identifier 302 and the fourth identifier 304, the inspector can accurately identify the taper point between the thick-diameter section 203 and the variable-tapered section 202 of the tapered optical fiber 20, thereby quickly distinguishing the distribution of the thin-diameter section 201, the variable-tapered section 202 and the thick-diameter section 203 on the entire tapered optical fiber 20 with the naked eye.

[0102] The steps described above in this embodiment will be explained in detail below with reference to specific embodiments.

[0103] 1) The online marking device collects data (Dt0, Lt0), (Dt1, Lt1), and (Dt2, Lt2) at average intervals, i.e., at times t0, t1, and t2, respectively. Here, Dt0, Dt1, and Dt2 refer to the diameters of the bare tapered optical fiber measured at times t0, t1, and t2, respectively, and Lt0, Lt1, and Lt2 refer to the cumulative take-up lengths of the tapered optical fiber measured from the start of the drawing process to times t0, t1, and t2, respectively.

[0104] 2) The online marking device controls the working state of the marking unit based on the marking control method set by the control unit, so as to realize the marking operation of the first mark and the second mark.

[0105] The labeling control method is as follows: Two standard coefficients K are set. 标1 and K 标2 K 标1 K represents the taper of the tapered section of a tapered optical fiber. 标2 The taper of the narrow or wide section of a tapered optical fiber.

[0106] Furthermore, K 标1 =(D 粗 -D 细 ) / L 锥区长度 , where D 粗 The diameter of the coarse section of a tapered optical fiber, D 细 The diameter L of the narrowest section of a tapered optical fiber. 锥区长度 The length of the tapered section of a tapered optical fiber; K 标2 =0.

[0107] 3) Calculate the actual taper variation coefficient K of the tapered optical fiber twice consecutively. 实际1 and K 实际2 :

[0108] K 实际1 =|(Dt1-Dt0) / (Lt1-Lt0)|;

[0109] K 实际2 =|(Dt2-Dt1) / (Lt2-Lt1)|.

[0110] 4) If K 实际1 and K 实际2 All equal to K 标1 If the data obtained at times t0, t1, and t2 all meet the requirements, then the position on the tapered fiber corresponding to time t0 is the default taper starting point. The first mark is made at this point, and the color of the first mark can be blue or other colors. The taper starting point is marked at the position corresponding to the sum of the drawing strokes L and Lt0 of the tapered fiber.

[0111] If K实际1 and K 实际2 All equal to K 标2 If all values ​​are equal to 0, then the data obtained at times t0, t1, and t2 all meet the requirements. By default, the position on the tapered fiber corresponding to time t0 is the tapering end point. The second mark is applied at this point, and the color of the second mark can be red or other colors. The marking position of the tapering end point is the position corresponding to the sum of the drawing strokes of the tapered fiber L and Lt0.

[0112] 5) The data obtained in step 1) at average intervals are calculated using the methods in steps 2) to 4), and the online marking device marks the tapered optical fiber sequentially according to the calculation results.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tapered optical fiber online marking device, characterized in that, include: The first diameter measuring unit is used to continuously detect the diameter information of the bare fiber of the tapered optical fiber at preset intervals. A marking unit is disposed on the front side of the first diameter measuring unit along the conveying direction of the tapered optical fiber, and is used to set a mark on the surface of the tapered optical fiber; The control unit is configured to calculate the taper variation coefficient of the tapered optical fiber based on the diameter information, determine the taper start point and taper end point of the tapered optical fiber based on the taper variation coefficient, and control the marking unit to set a first mark at the taper start point and a second mark at the taper end point. The step of determining the taper start point and taper end point of the tapered optical fiber based on the taper variation coefficient includes: The taper variation coefficient K is equal to K 标1 When the taper variation coefficient K equals K, determine the starting point of the tapered change; 标2 At that time, determine the end point of the variable cone; K 标1 K represents the taper of the tapered section of a tapered optical fiber. 标2 Zero; The taper variation coefficient K=|(Dt) n+1 -Dt n ) / (Lt n+1 -Lt n )|;wherein, Dt n+1 For the bare fiber of the tapered optical fiber at t n+1 The diameter at time, Dt n For the bare fiber of the tapered optical fiber at t n The diameter of time, Lt n+1 For the tapered optical fiber at t n+1 The take-up length at any given time, Lt n For the tapered optical fiber at t n The length of the wire taken up at any given moment.

2. The tapered optical fiber online marking device according to claim 1, characterized in that, The step of controlling the marking unit to set the first mark at the starting point of the tapered cone includes: Obtain the axial distance L between the first diameter measuring unit and the marking unit, and the taper of the optical fiber when the taper variation coefficient K is equal to K. 标1 The take-up length L1 at the moment; When the drawing stroke of the tapered optical fiber is the sum of the axial distance L and the take-up length L1, the marking unit is controlled to set the first mark on the surface of the tapered optical fiber.

3. The tapered optical fiber online marking device according to claim 1, characterized in that, The step of controlling the marking unit to set the second mark at the end point of the tapered cone includes: Obtain the axial distance L between the first diameter measuring unit and the marking unit, and the taper of the optical fiber when the taper variation coefficient K is equal to K. 标2 The take-up length L2 at the moment; When the drawing stroke of the tapered optical fiber is the sum of the axial distance L and the take-up length L2, the marking unit is controlled to set the second mark on the surface of the tapered optical fiber.

4. The tapered optical fiber online marking device according to any one of claims 1 to 3, characterized in that, The first identifier is a first color identifier, and the second identifier is a second color identifier, wherein the colors identified by the first color identifier and the second color identifier are different.

5. The tapered optical fiber online marking device according to any one of claims 1 to 3, characterized in that, Also includes: Preformed rod fixture, drawing furnace, coating and curing unit, traction unit and fiber take-up unit; The preformed rod clamp, the drawing furnace, the first diameter measuring unit, the coating and curing unit, the marking unit, the traction unit, and the fiber take-up unit are arranged in sequence and are electrically connected to the control unit respectively. The preform clamp is used to hold the optical fiber preform and control the optical fiber preform to extend towards the drawing furnace; the drawing furnace is used to control the drawing temperature of the optical fiber preform; the traction unit is used to control the drawing speed of the tapered optical fiber; and the fiber take-up unit is used to perform a take-up operation on the tapered optical fiber.

6. A marking control method for an online marking device for a tapered optical fiber as described in any one of claims 1 to 5, characterized in that, include: The diameter information of the bare fiber of the tapered optical fiber is continuously acquired at preset intervals. Based on the diameter information, calculate the taper variation coefficient of the tapered optical fiber; The taper variation coefficient is used to determine the taper start point and taper end point of the tapered optical fiber; The marking unit is controlled to set a first mark at the starting point of the tapered section and a second mark at the ending point of the tapered section.

7. The marking control method according to claim 6, characterized in that, The step of determining the taper start point and taper end point of the tapered optical fiber based on the taper variation coefficient includes: The taper variation coefficient K is equal to K 标1 When the taper variation coefficient K equals K, determine the starting point of the tapered change; 标2 At that time, determine the end point of the variable cone; Among them, K 标1 K represents the taper of the tapered section of a tapered optical fiber. 标2 It is zero.

8. The marking control method according to claim 6, characterized in that, Also includes: If the diameter information matches the diameter of the narrow section of the tapered optical fiber, after controlling the marking unit to mark the first mark, the marking unit is also controlled to set a third mark on one side of the tapered starting point. If the diameter information matches the diameter of the coarse section of the tapered optical fiber, after controlling the marking unit to mark the first mark, the marking unit is also controlled to set a fourth mark on one side of the tapered starting point.

Images