Multi-fiber measuring device based on laser diffraction

Abstract

The invention discloses a multi-fiber measuring device based on laser diffraction, and belongs to the technical field of filament diameter measurement. The multi-fiber measuring device comprises a laser adjusting mechanism for adjusting the spatial position and orientation of a laser, a measuring mechanism, a sample clamping mechanism and a base, the laser adjusting mechanism and the measuring mechanism are placed on the base; the sample clamping mechanism is fixed on the base; the sample clamping mechanism is positioned between the laser adjusting mechanism and the measuring mechanism; the sample clamping mechanism comprises a sample bottom plate; an adjusting part for switching fibers of the test piece is arranged on the sample bottom plate close to one end of the measuring mechanism; the measuring mechanism comprises an optical screen and a measuring scale for measuring the distance between the test piece and the optical screen; the measuring scale penetrates through the bottom of the sample bottom plate and directly reaches the laser adjusting mechanism. According to the invention, on the premise of ensuring lossless measurement of the fibers, the diameters of a plurality of fine fibers with different sizes can be measured by adjusting one-time sample loading, the measurement precision is high, and the cost is low.

Description

Technical Field

[0001] The invention belongs to the technical field of filament diameter measurement, and in particular relates to a multi-fiber filament measuring device based on laser diffraction. Background Art

[0002] Fiber diameter is an important indicator of reactive fiber performance. Accurately measuring fiber diameter is of great significance to fiber production, quality testing, and composite material performance research. When the fiber size is in the micron level (1 to 50 microns in diameter), it is difficult to accurately distinguish this magnitude with the naked eye, and other methods are needed.

[0003] Commonly used methods include optical microscopy, electron microscopy, and laser diffraction. Electron microscope instruments and testing costs are high, and the fibers of insulating materials (such as aluminum oxide and silicon carbide) need to be pre-sprayed with metal, so non-destructive measurement is not possible. Using a special optical microscope at a certain magnification (5000 times) can distinguish single fibers, but due to the wave-particle duality of light, the edges of the fibers are generally unclear, with a minimum resolution of 200nm. At the same time, the instrument cost is still very high.

[0004] The laser diffraction method can greatly reduce the test cost while ensuring the measurement accuracy. It can measure both conductors and insulators, and is an ideal method for measuring fiber diameters. Most of the current laser diffraction measurement methods are specially designed for measuring single fiber filaments, and use high-resolution photographic equipment to observe the diffraction pattern, which increases the cost of the instrument. Considering that the actual fiber filament size is not completely consistent, but has a certain distribution pattern, it is necessary to develop a device that can conveniently measure the diameters of multiple fiber filaments to confirm their distribution pattern. Summary of the invention

[0005] The purpose of the present invention is to provide a multi-fiber measuring device based on laser diffraction, which can measure the diameters of multiple fine fibers of different sizes by adjusting the sample once while ensuring non-destructive measurement of the fibers, and has high measurement accuracy, high measurement efficiency, low cost and simple operation.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A multi-fiber filament measuring device based on laser diffraction, the multi-fiber filament measuring device comprising a laser adjusting mechanism 1 for adjusting the spatial position and orientation of the laser, a measuring mechanism 2, a sample clamping mechanism 3 and a base 4;

[0008] The laser adjustment mechanism 1 and the measuring mechanism 2 are placed on the base 4; the sample clamping mechanism 3 is fixed on the base 4; the sample clamping mechanism 3 is located between the laser adjustment mechanism 1 and the measuring mechanism 2;

[0009] The sample clamping mechanism 3 includes a sample bottom plate 31; close to one end of the measuring mechanism 2, the sample bottom plate 31 is provided with an adjustment component for switching the fiber filaments of the test piece 51;

[0010] The measuring mechanism 2 includes a light screen 22 and a measuring ruler 21 for measuring the distance between the test piece 51 and the light screen 22 ; the measuring ruler 21 passes through the bottom of the sample bottom plate 31 and directly reaches the laser adjustment mechanism 1 .

[0011] Furthermore, the adjusting component includes a slider 32; an upper groove 321 and a lower groove 322 are respectively provided on the upper and lower sides of the slider 32;

[0012] The upper surface of the slider 32 is provided with an upper groove 321 for placing the test piece 51; the slider 32 clamps the test piece 51 through the cushion block 33 and the locking component 34;

[0013] A sloped guide rail 311 is provided on the sample bottom plate 31 near one end of the measuring mechanism 2 ; the slider 32 contacts and cooperates with the sloped guide rail 311 through a lower groove 322 , so that the slider 32 moves on the sample bottom plate 31 along a horizontal line parallel to the light screen 22 with the test piece 51 .

[0014] Furthermore, the test piece 51 includes a paper frame 512 to which a plurality of fiber filaments 511 are attached;

[0015] The paper frame 512 is clamped in the upper groove 321 by the cushion block 33 and the locking component 34 .

[0016] Furthermore, among the plurality of fiber filaments 511, the length of each fiber filament is greater than 20 mm, and the distance between adjacent fiber filaments is 4 to 6 mm.

[0017] Furthermore, a first groove 35 is provided on the back of the sample bottom plate 31;

[0018] The measuring ruler 21 passes through the first groove 35 to adjust the distance between the test piece 51 and the light screen 22 .

[0019] Furthermore, the laser adjustment mechanism 1 includes a lifting platform 13 for adjusting the height of the laser 11 and a horizontal tripod 12 fixed on the lifting platform 13;

[0020] The horizontal tripod 12 is provided with a clamping component for fixing the laser 11 .

[0021] Furthermore, three supporting feet 121 for adjusting the pitch angle of the laser 11 are provided at the lower end of the horizontal tripod 12 .

[0022] Furthermore, a raised portion 41 is provided on the base 4;

[0023] The lifting platform 13 is placed on the raised portion 41 .

[0024] Furthermore, a printing paper with a corrugated pattern 221 consisting of a center point and a series of concentric arcs is pasted on the light screen 22 , so that the laser can irradiate the center point of the corrugated pattern 221 .

[0025] Furthermore, the minimum arc radius on the corrugated pattern 221 is 8 to 10 mm;

[0026] The radius difference between adjacent concentric arcs is 8 to 10 mm, which is the same as the minimum arc radius.

[0027] In summary, the technical solution of the present invention has the following technical effects:

[0028] The present invention adjusts the spatial position and orientation of the laser through a laser adjustment mechanism, so that the laser can be vertically irradiated on a light screen; through the adjustment component of the sample clamping mechanism, the laser can be directly irradiated on a fiber filament and can be switched to the next fiber filament, so as to realize the switching of multiple fiber filaments and complete batch testing, and the fiber filaments not being completely vertical will not affect the test, and under the premise of ensuring non-destructive measurement of the fiber filaments, it is achieved that the diameters of multiple fine fiber filaments of different sizes can be measured by adjusting the sample once, and the measurement accuracy and efficiency are high; by adjusting the distance between the light screen of the measuring mechanism and the test piece, the corrugation pattern of the light screen is overlapped with the dark part of the diffraction stripes, so as to ensure the accuracy of the measurement results of the diameters of multiple fine fiber filaments; the present invention uses laser diffraction to measure the diameters of the filaments, with high measurement accuracy, and no restriction on the conductivity of the fiber filaments to be measured; the present invention has a simple structure, low cost, convenient operation, and is easy to promote and popularize. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1This is a schematic structural diagram of a multi-fiber diameter measuring device based on laser diffraction according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of a laser adjustment mechanism according to an embodiment of the present invention;

[0032] Figure 3 It is a schematic diagram of the structure of the measuring mechanism of an embodiment of the present invention;

[0033] Figure 4 It is a schematic diagram of the structure of a sample clamping mechanism according to an embodiment of the present invention;

[0034] Figure 5 A schematic diagram of a test piece according to an embodiment of the present invention;

[0035] Figure 6 The bottom view, front view and geometrical shape schematic diagram of the sample seat plate of the embodiment of the present invention;

[0036] Figure 7 It is a schematic diagram of the assembly of the sample clamping mechanism, the test piece and the base according to an embodiment of the present invention;

[0037] In the figure, 1-laser adjustment mechanism, 11-laser 11, 12-horizontal tripod, 121-supporting foot, 122-rotating shaft, 13-lifting platform, 131-upper surface, 132-adjusting screw, 14-power cord, 2-measuring mechanism, 21-measuring ruler, 22-light screen, 221-corrugated pattern, 3-sample clamping mechanism, 31-sample bottom plate, 32-slider, 33-pad, 34-locking component, 35-first groove, 321-upper groove, 322-lower groove, 311-inclined guide rail, 4-base, 41-raised part, 51-test piece, 512-paper frame, 511-fiber filament. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] This embodiment provides a multi-fiber measurement device based on laser diffraction. Figure 1 and 7The multi-filament measuring device comprises a laser adjusting mechanism 1 for adjusting the spatial position and orientation of the laser, a measuring mechanism 2, a sample clamping mechanism 3 and a base 4. The laser adjusting mechanism 1 and the measuring mechanism 2 are placed on the base 4, the sample clamping mechanism 3 is fixed on the base 4, and the sample clamping mechanism 3 is located between the laser adjusting mechanism 1 and the measuring mechanism 2.

[0040] The structure of the laser adjustment mechanism 1 in this embodiment is shown in FIG. Figure 1 and 2 , including a lifting platform 13 for adjusting the height of the laser 11 and a horizontal tripod 12 fixed on the lifting platform 13. The horizontal tripod 12 is provided with a clamping component for fixing the laser 11. The lower end of the horizontal tripod 12 is provided with three supporting feet 121 for adjusting the pitch angle of the laser 11. The laser 11 is adjusted to be powered on through a power cord 14.

[0041] The structure of the measuring mechanism 2 in this embodiment is shown in FIG. Figure 1 and 3 , including a light screen 22 and a measuring ruler 21 for measuring the distance between the test piece 51 and the light screen 22, the measuring ruler 21 passes through the bottom of the sample bottom plate 31 and directly reaches the laser adjustment mechanism 1. A printing paper printed with a corrugated pattern 221 consisting of a center point and a series of concentric arcs is pasted on the light screen 22, so that the laser can irradiate the center point of the corrugated pattern 221. The minimum arc radius on the corrugated pattern 221 is 8 to 10 mm, and the radius difference between adjacent concentric arcs is 8 to 10 mm.

[0042] The structure of the sample clamping mechanism 3 in this embodiment is shown in FIG. Figure 1 , 4 6, including a sample bottom plate 31, close to one end of the measuring mechanism 2, the sample bottom plate 31 is provided with an adjustment component for switching the fiber filaments of the test piece 51. The adjustment component includes a slider 32, and an upper groove 321 and a lower groove 322 are respectively provided on the upper and lower sides of the slider 32. The upper surface of the slider 32 is provided with an upper groove 321 for placing the test piece 51. The slider 32 clamps the test piece 51 through a pad 33 and a locking component 34. Close to one end of the measuring mechanism 2, an inclined guide rail 311 is provided on the sample bottom plate 31. The slider 32 contacts and cooperates with the inclined guide rail 311 through the lower groove 322, so that the slider 32 moves with the test piece 51 on the sample bottom plate 31 along a horizontal line parallel to the light screen 22. A first groove 35 is provided on the back of the sample bottom plate 31, and the measuring ruler 21 passes through the first groove 35 to adjust the distance between the test piece 51 and the light screen 22. The sample bottom plate 31 limits the sliding direction of the measuring ruler 21 to only be along the length direction. The light path generated when the laser 11 emits light needs to be completely perpendicular to the light screen before measurement can begin.

[0043] refer to Figure 4 and5 The test piece 51 in this embodiment includes a paper frame 512 with a plurality of fiber filaments 511 pasted thereon, and the paper frame 512 is clamped in the upper groove 321 by means of a pad 33 and a locking component 34. Among the 10 fiber filaments 511, the length of each fiber filament is greater than 20 mm, and the spacing between adjacent fiber filaments is 4 to 6 mm, preferably 5 mm. They are fixed to the paper frame 512 using instant adhesive, and the length of the measuring section can be 20 mm. The material of the paper frame 512 in this embodiment can be 70g printing paper, and a pattern can be printed as a mark. The external dimensions are 65mm*40mm, and the dimensions of the upper edge, left edge, and right edge of the paper frame 512 are 5mm. The size of the clamping section reserved at the lower edge of the paper frame 512 is 15mm, so that the size of the central rectangular window (i.e., the internal dimension) is 55mm*20mm.

[0044] In this embodiment, the position and orientation of the laser 11 are adjusted by the lifting platform 13 and the horizontal tripod 12. The lifting platform 13 adjusts the height of the laser 11 by adjusting the screw 132. The horizontal tripod 12 is placed on the upper surface 131 of the lifting platform 13. The horizontal tripod 12 is adjusted in length by rotating three supporting feet 121 with internal threads, thereby changing the pitch angle of the laser 11. The laser 11 can rotate around the rotating shaft 122 of the horizontal tripod 12, and the orientation of the laser 11 can be adjusted.

[0045] like Figure 6 As shown, the sample bottom plate 31 has two threaded holes 313 for fixing the base 11. The thread specification of the threaded hole 313 is M10. Figure 7 As shown, two bolts 61 are used to pass through the holes of the base 4 from the bottom and are tightened and fixed to the sample holder 31.

[0046] When installing the device, first follow Figure 7 As shown, the sample bottom plate 31 and the base 4 are fixedly connected, and then Figure 1 As shown, the measuring ruler 21 is passed under the sample bottom plate 31. The lifting platform 13 is placed on the raised part 41 of the base 4, and then the laser 11 and the horizontal tripod 12 are connected and placed on the lifting platform 13, and the power line 14 is connected.

[0047] The specific test steps of the multi-fiber measurement device of laser diffraction in this embodiment include:

[0048] Step S1 , turning on the power of the laser 11 , adjusting the position of the horizontal tripod 12 on the lifting platform 13 , so that the laser irradiates the center point of the corrugated pattern 22 of the light screen 22 .

[0049] Fine-tune the position of the horizontal tripod 12, the height of the supporting foot 121, the horizontal orientation of the laser 11, and the height of the lifting platform 13 so that the laser can shine vertically on the light screen 22 (if the light path is perpendicular to the light screen, the laser should shine on the same point on the light screen when the light screen is moved closer to the laser and further away from the laser).

[0050] Step S2, after the test piece 51 is installed, the lower edge of the paper frame 512 in the test piece 51 is placed on the upper groove 321 of the slider 32, and is clamped using the pad 33 and the locking component 34 (such as a screw), and then the entirety is placed on the inclined guide rail 311 of the sample base plate 31, so that the lower groove 322 is in contact with the inclined guide rail 311.

[0051] Step S3, horizontally move the slider 32 so that the laser can directly irradiate the first fiber filament 511. At this time, dotted diffraction fringes perpendicular to the fiber filament direction appear on the light screen 22. Adjust the distance between the light screen 22 and the laser 11 so that the ripple pattern 221 of the light screen 22 coincides with the dark part of the diffraction fringes, and read the distance l between the fiber filament on the test piece 51 and the light screen 22 on the measuring ruler 21.

[0052] Step S4, calculating the diameter of the first fiber filament.

[0053] The diameter of each fiber in this embodiment is:

[0054]

[0055] Wherein, d is the diameter of each fiber; λ is the laser wavelength, which is generally 650nm; l is the distance between each fiber on the test piece and the light screen; l0 is the minimum arc radius of the corrugated pattern.

[0056] Step S5, adjust the slider 32 so that the laser irradiates the next fiber, and repeat step S3 until all fiber diameters are measured. The probability distribution of fiber diameters is obtained through the measurement results of the diameters of multiple fiber filaments.

[0057] In this embodiment, the spatial position and orientation of the laser are adjusted by a laser adjustment mechanism, so that the laser can be irradiated vertically on the light screen; through the adjustment component of the sample clamping mechanism, the laser can be directly irradiated on a fiber filament and can be switched to the next fiber filament, so as to realize the switching of multiple fiber filaments and complete batch testing, and the fiber filaments not being completely vertical will not affect the test. Under the premise of ensuring non-destructive measurement of the fiber filaments, the diameters of multiple fine fiber filaments of different sizes can be measured by adjusting the sample once, and the measurement accuracy and efficiency are high; by adjusting the distance between the light screen of the measuring mechanism and the test piece, the corrugated pattern of the light screen coincides with the dark part of the diffraction stripes, so as to ensure the accuracy of the measurement results of the diameters of multiple fine fiber filaments; in this embodiment, laser diffraction is used to measure the diameters of fine filaments, with high measurement accuracy and no restrictions on the conductivity of the fiber filaments to be measured; the structure of this embodiment is simple, the cost is low, the operation is convenient, and it is easy to promote and popularize.

[0058] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A multi-fiber measurement device based on laser diffraction, characterized in that: The multi-filament measuring device comprises a laser adjustment mechanism (1) for adjusting the spatial position and orientation of the laser, a measuring mechanism (2), a sample clamping mechanism (3) and a base (4); The laser adjustment mechanism (1) and the measuring mechanism (2) are placed on the base (4); the sample clamping mechanism (3) is fixed on the base (4); the sample clamping mechanism (3) is located between the laser adjustment mechanism (1) and the measuring mechanism (2); The sample clamping mechanism (3) comprises a sample bottom plate (31); an adjusting component for switching the fiber filaments of the test piece (51) is arranged on the sample bottom plate (31) at one end close to the measuring mechanism (2); The measuring mechanism (2) comprises a light screen (22) and a measuring ruler (21) for measuring the distance between the test piece (51) and the light screen (22); the measuring ruler (21) passes through the bottom of the sample bottom plate (31) and directly reaches the laser adjustment mechanism (1).

2. The multi-filament measuring device according to claim 1, characterized in that: The adjusting component comprises a slider (32); an upper groove (321) and a lower groove (322) are respectively arranged on the upper side and the lower side of the slider (32); An upper groove (321) for placing a test piece (51) is provided on the upper surface of the slide block (32); the slide block (32) cooperates with a cushion block (33) and a locking component (34) to clamp the test piece (51); A sloped guide rail (311) is provided on the sample bottom plate (31) near one end of the measuring mechanism (2); the slider (32) contacts and cooperates with the sloped guide rail (311) via a lower groove (322), so that the slider (32) moves with the test piece (51) on the sample bottom plate (31) along a horizontal line parallel to the light screen (22).

3. The multi-filament measuring device according to claim 2, characterized in that: The test piece (51) comprises a paper frame (512) on which a plurality of fiber filaments (511) are attached; The paper frame (512) is clamped in the upper groove (321) by the cushion block (33) and the locking component (34).

4. The multi-filament measuring device according to claim 3, characterized in that: Among the plurality of fiber filaments (511), the length of each fiber filament is greater than 20 mm, and the distance between adjacent fiber filaments is 4 to 6 mm.

5. The multi-filament measuring device according to claim 4, characterized in that: The back side of the sample bottom plate (31) is provided with a first groove (35); The measuring ruler (21) passes through the first groove (35) to adjust the distance between the test piece (51) and the light screen (22).

6. The multi-filament measuring device according to any one of claims 1 to 5, characterized in that: The laser adjustment mechanism (1) comprises a lifting platform (13) for adjusting the height of the laser (11) and a horizontal tripod (12) fixed on the lifting platform (13); The horizontal tripod (12) is provided with a clamping component for fixing the laser (11).

7. The multi-filament measuring device according to claim 6, characterized in that: The lower end of the horizontal tripod (12) is provided with three supporting feet (121) for adjusting the pitch angle of the laser (11).

8. The multi-filament measuring device according to claim 7, characterized in that: The base (4) is provided with a raised portion (41); The lifting platform (13) is placed on the raised portion (41).

9. The multi-filament measuring device according to claim 8, characterized in that: Printing paper with a corrugated pattern (221) consisting of a center point and a series of concentric arcs is pasted on the light screen (22), so that the laser can irradiate the center point of the corrugated pattern (221).

10. The multi-filament measuring device according to claim 9, characterized in that: The minimum arc radius on the corrugated pattern (221) is 8 to 10 mm; The radius difference between adjacent concentric arcs is 8 to 10 mm, which is the same as the minimum arc radius.

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