CN116793260A - Fiber bragg grating curvature sensing testing device and testing method thereof - Google Patents
Fiber bragg grating curvature sensing testing device and testing method thereof Download PDFInfo
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- CN116793260A CN116793260A CN202310795944.1A CN202310795944A CN116793260A CN 116793260 A CN116793260 A CN 116793260A CN 202310795944 A CN202310795944 A CN 202310795944A CN 116793260 A CN116793260 A CN 116793260A
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- 238000012360 testing method Methods 0.000 title claims abstract description 283
- 239000000835 fiber Substances 0.000 title claims abstract description 85
- 238000005452 bending Methods 0.000 claims abstract description 61
- 230000003287 optical effect Effects 0.000 claims abstract description 51
- 238000006073 displacement reaction Methods 0.000 claims abstract description 37
- 239000013013 elastic material Substances 0.000 claims abstract description 4
- 230000000712 assembly Effects 0.000 claims description 21
- 238000000429 assembly Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 15
- 230000009467 reduction Effects 0.000 claims description 12
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- 238000010998 test method Methods 0.000 claims description 9
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims 2
- 239000013307 optical fiber Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/255—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring radius of curvature
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Abstract
The invention discloses a fiber bragg grating curvature sensing testing device and a testing method thereof, wherein the testing device comprises: a test platform, comprising: the optical flat and two restraint subassemblies of relative position are connected with the test piece between two restraint subassemblies, and wherein, restraint subassembly includes: the X-axis displacement table is connected to the optical flat plate and can move along the X-axis direction, one end of the Z-axis displacement table is connected with the X-axis displacement table, the other end of the Z-axis displacement table is connected with the clamp and is configured to drive the clamp to rotate around the Z-axis direction, and the clamp is configured to be fixedly connected with a test piece; the test piece is an elastic material piece; the fiber bragg grating demodulator is configured to convert an optical signal of the wavelength variation monitored by the fiber bragg grating test line based on the deformation of the test piece into an electrical signal; and the computer is coupled with the fiber grating demodulator and is configured to receive the electric signals converted by the fiber grating demodulator and reconstruct the bending form of the test piece and acquire data.
Description
Technical Field
The invention relates to the field of fiber bragg grating curvature sensing, in particular to a fiber bragg grating curvature sensing testing device and a testing method thereof.
Background
The fiber bragg grating curvature sensor has the advantages of simple principle, high sensitivity, high precision, electromagnetic interference resistance, passive work and the like, and is widely applied to the fields of medical catheter intervention, aerospace structure monitoring, soft robot shape monitoring and the like. As the inversion reconstruction of the two-dimensional bending form of the fiber bragg grating curvature sensor is related to the position of the fiber bragg grating measuring line, a sensing error occurs when the fiber bragg grating measuring line generates a rotation or torsion angle, and the precision compensation of the fiber bragg grating curvature sensor is reported. Currently, in order to realize the curvature sensing test of the fiber bragg grating, an cantilever beam type test method is mostly adopted, one end of a test piece is fixed, and the other end of the test piece is loaded through weights to enable the test piece to generate two-dimensional bending. The device and the method are difficult to realize specific curvature bending of the test piece, and meanwhile, the precision compensation test of the two-dimensional bending superposition knob angle of the test piece is difficult to develop. In the fiber bragg grating curvature sensing test process, in order to achieve the adjustment of the curvature and the twist angle of a test piece, a novel test device and a test method for the fiber bragg grating curvature sensing test are needed to be provided.
Disclosure of Invention
The technical aim can be achieved by adopting the following technical characteristics, and other technical effects are brought about.
An object of the present invention is to provide a fiber grating curvature sensing test device, comprising:
the test platform comprises: the optical flat and along the constraint subassembly of two relative positions of Y axle direction interval setting on the optical flat, be connected with the test piece between two constraint subassemblies, wherein, the constraint subassembly includes: the X-axis displacement table is connected to the optical flat plate and can move along the X-axis direction, one end of the Z-axis displacement table is connected with the X-axis displacement table, the other end of the Z-axis displacement table is connected with the clamp and is configured to drive the clamp to rotate around the Z-axis direction, and the clamp is configured to be fixedly connected with the test piece; the test piece is an elastic material piece;
the fiber bragg grating demodulator is connected to the surface of the test piece through a fiber bragg grating test line and is configured to convert an optical signal of the wavelength variation monitored by the fiber bragg grating test line based on the deformation of the test piece into an electrical signal;
The computer is coupled with the fiber grating demodulator and is configured to receive the electric signals converted by the fiber grating demodulator and reconstruct and acquire the bending form of the test piece;
wherein the X-axis direction, the Y-axis direction and the Z-axis direction are mutually perpendicular to each other.
In the technical scheme, when a test is carried out on the testing device, the positions of two constraint components are firstly adjusted on an optical flat plate, so that the two constraint components are arranged at intervals along the Y-axis direction, and the clamps of the two constraint components are positioned on the same axis; then, the test piece is installed on the clamps of the two constraint components, and the test piece is fixed through the two clamps; wherein, the angle scale values of the two ends of the test piece on the clamp are equal and do not generate relative torsion or the two ends of the test piece generate relative torsion; then, one of the constraint components is used as a fixed end, the other constraint component is used as a movable end, the displacement of the fixed end in all directions is kept to be zero, and the movable end is moved along the X-axis direction, so that the test piece is in a two-dimensional bending state; continuously adjusting the Z-axis rotary table of the movable end constraint component to enable the Z-axis rotary table to correspond to the bending state of the test piece; and finally, reconstructing and collecting the bending form of the test piece by a computer, comparing the bending form with a two-dimensional projection curve of the test piece on an optical flat plate, and determining the curvature information reduction precision of the test piece; the testing conditions of the conditions that the angle scales of the two ends of the test piece on the clamp are zero and relative torsion does not occur are removed, and the testing conditions further comprise: and the computer performs precision compensation, and compares the two-dimensional projection curve of the test piece on the optical flat plate with the curve before precision compensation to determine the curvature information reduction precision and compensation effect of the test piece. Compared with the traditional cantilever beam type testing device and method, the fiber grating curvature sensing testing device can achieve specific curvature bending of the test piece, meanwhile, the rotation angle and the torsion angle of the test piece in a two-dimensional bending state can be adjusted, the precision compensation testing of the two-dimensional bending superposition torsion angle of the test piece is facilitated, in addition, the testing device effectively inhibits axial stretching of the test piece, and measurement precision is improved.
In addition, the fiber grating curvature sensing testing device according to the invention can also have the following technical characteristics:
in one example of the present invention, the Z-axis rotation table includes:
the base is fixedly connected to the X-axis displacement table;
the rotating disc is pivotally connected to the base, and the clamp is fixedly connected to the rotating disc;
and the driving piece is connected with the rotating disc and is configured to drive the rotating disc to rotate relative to the base.
In one example of the present invention, the driving member includes:
the first connecting block is fixedly connected with the screw rod;
the base is provided with a threaded hole, and the screw rod is matched with the threaded hole;
the rotating disc is fixedly provided with a driving shaft, and a first clamping groove matched with the driving shaft is formed in the circumferential direction of the first connecting block.
In one example of the present invention, the driving member includes:
the sliding rod is fixedly connected with the second connecting block, and a protruding part is arranged on the sliding rod; the rotating disc is fixedly provided with a driving shaft, and a second clamping groove matched with the driving shaft is formed in the second connecting block;
The base is provided with a sliding rail, a plurality of concave parts are arranged in the sliding rail, and the convex parts are clamped in any concave parts in the sliding rail.
In one example of the present invention, the Z-axis rotation table further includes:
and the limiting piece is connected between the base and the rotating disc and is configured to be capable of performing switching movement between a first position for limiting the rotating disc to perform rotating movement relative to the base and a second position for releasing the rotating disc to perform rotating movement relative to the base.
In one example of the present invention, an angle scale is formed in the circumferential direction of the jigs, and both ends of the test piece can be fixed at a designated torsion angle and/or rotation angle when the test piece is fixedly installed between the two jigs.
In one example of the present invention, the fiber grating test line is arranged along the extending direction of the test piece, and a plurality of grating detection points are formed on the surface of the test piece by bonding with an adhesive at equal intervals.
Another object of the present invention is to provide a testing method of the optical fiber grating curvature sensing testing device, which includes the following steps:
S11: the positions of the two restraint components are adjusted on the optical flat plate, so that the two restraint components are arranged at intervals along the Y-axis direction, and the clamps of the two restraint components are positioned on the same axis;
s12: mounting the test piece on the clamps of the two constraint components, and fixing the test piece through the two clamps; wherein, the two ends of the test piece have equal angle scale values on the clamp as claimed in claim 5 and do not generate relative torsion;
s13: one of the constraint components is used as a fixed end, the other constraint component is used as a movable end, wherein the displacement of the fixed end in all directions is kept to be zero, and the movable end is moved along the X-axis direction to enable the test piece to be in a two-dimensional bending state;
s14: adjusting a Z-axis rotary table of the movable end constraint assembly to enable the Z-axis rotary table to correspond to the bending state of the test piece;
s15: and reconstructing and collecting the bending form of the test piece by a computer, comparing the bending form with a two-dimensional projection curve of the test piece on the optical flat plate, and determining the curvature information reduction precision of the test piece.
In one example of the present invention, when the angle scales of both ends of the test piece on the jig are non-zero, the method further includes, after step S15:
And the computer performs precision compensation, and compares the two-dimensional projection curve of the test piece on the optical flat plate with the curve before precision compensation to determine the curvature information reduction precision and compensation effect of the test piece.
Still another object of the present invention is to provide a testing method of the optical fiber grating curvature sensing testing device, which includes the following steps:
s21: the positions of the two restraint components are adjusted on the optical flat plate, so that the two restraint components are arranged at intervals along the Y-axis direction, and the clamps of the two restraint components are positioned on the same axis;
s22: the test piece is arranged on the clamps of the two constraint components, one end of the test piece is twisted by a designated angle relative to the other end of the test piece, and the two ends of the test piece are fixed through the two clamps;
s23: one of the constraint components is used as a fixed end, the other constraint component is used as a movable end, wherein the displacement of the fixed end in each direction is kept to be zero, and the movable end is moved along the X-axis direction so that the test piece is in a two-dimensional bending and torsion state;
s24: adjusting a Z-axis rotary table of the movable end constraint assembly to enable the Z-axis rotary table to correspond to the bending state of the test piece;
S25: reconstructing and collecting the bending form of the test piece by a computer, comparing the bending form with a two-dimensional projection curve of the test piece on an optical flat plate, and determining the curvature information reduction precision of the test piece;
s26: and the computer performs precision compensation, and compares the two-dimensional projection curve of the test piece on the optical flat plate with the curve before precision compensation to determine the curvature information reduction precision and compensation effect of the test piece.
Preferred embodiments for carrying out the present invention will be described in more detail below with reference to the attached drawings so that the features and advantages of the present invention can be easily understood.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the following description will briefly explain the drawings of the embodiments of the present invention. Wherein the showings are for the purpose of illustrating some embodiments of the invention only and not for the purpose of limiting the same.
FIG. 1 is a schematic diagram of a fiber grating curvature sensing test device according to an embodiment of the invention;
FIG. 2 is a side view of a fiber grating curvature sensing test device according to an embodiment of the present invention;
FIG. 3 is a top view of a Z-axis turntable according to an embodiment of the invention;
FIG. 4 is a schematic view of a driving member according to one embodiment of the present invention;
FIG. 5 is a schematic view of a driving member according to another embodiment of the present invention;
FIG. 6 is a non-rotational non-torsional slope recursion inversion reconstruction graph according to an embodiment of the present invention;
FIG. 7 is a graph of a rotation-free torsion-free slope recurrence inversion error in accordance with an embodiment of the present invention;
FIG. 8 is a graph showing the inversion reconstruction before and after the accuracy compensation when the rotation error angle is 30 DEG according to the embodiment of the present invention;
FIG. 9 is a graph showing the comparison of the inversion errors before and after the compensation of the rotation error angle of 30 according to the embodiment of the present invention;
FIG. 10 is a graph showing the inversion reconstruction before and after the accuracy compensation when the rotation error angle is 45 DEG according to the embodiment of the invention;
FIG. 11 is a graph showing the comparison of the inversion errors before and after the precision compensation when the rotation error angle is 45 according to the embodiment of the invention;
FIG. 12 is a graph showing the inversion reconstruction before and after the compensation of the accuracy at a torsional error angle of 10 according to an embodiment of the present invention;
FIG. 13 is a graph showing the comparison of the inversion errors before and after the compensation of the accuracy when the torsional error angle is 10 according to the embodiment of the present invention;
FIG. 14 is a graph showing the inversion reconstruction before and after the compensation of the accuracy for a 20 degree twist error angle in accordance with an embodiment of the present invention;
FIG. 15 is a graph showing the comparison of the inversion errors before and after the compensation of the accuracy at a 20 degree twist error angle in accordance with an embodiment of the present invention.
List of reference numerals:
a testing device 1000;
a test platform 100;
an optical flat plate 10;
a first positioning hole 11;
a restraint assembly 20;
an X-axis displacement stage 21;
a Z-axis rotary table 22;
a base 221;
a threaded bore 2211;
slide rail 2212;
a recess 2213;
a rotation shaft 2214;
a connection station 2215;
rotating the disc 222;
a drive shaft 2221;
a driving member 223;
a screw 2231;
a first connection block 2232;
a first clip groove 2233;
a slide rod 2234;
a second connection block 2235;
a second clip groove 2236;
a boss 2237;
a limiting member 224;
a clamp 23;
a mounting hole 231;
an angle scale 232;
notch 233;
a bolt member 234;
a test piece 30;
a grating detection point 30A;
fiber grating demodulator 200;
a fiber grating test line 210;
a computer 300.
Detailed Description
In order to make the objects, technical solutions and advantages of the technical solutions of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments of the present invention. Like reference numerals in the drawings denote like parts. It should be noted that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Likewise, the terms "a" or "an" and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
A fiber grating curvature sensing test device 1000 according to a first aspect of the present invention, as shown in fig. 1 to 5, includes:
The test platform 100 includes: the optical flat 10 and restraint components 20 arranged at two opposite positions on the optical flat 10 along the Y-axis direction at intervals, and a test piece 30 is connected between the two restraint components 20, wherein the restraint components 20 comprise: an X-axis displacement table 21, a Z-axis rotation table 22, and a jig 23, the X-axis displacement table 21 being connected to the optical flat 10 and being movable in the X-axis direction, one end of the Z-axis rotation table 22 being connected to the X-axis displacement table 21, the other end being connected to the jig 23 and configured to drive the jig 23 to rotate about the Z-axis direction, the jig 23 being configured to be fixedly connected to the test piece 30; the test piece 30 is an elastic material piece;
the fiber bragg grating demodulator 200 is connected to the surface of the test piece 30 through a fiber bragg grating test line 210, and is configured to convert an optical signal of a wavelength variation monitored by the fiber bragg grating test line 210 based on the deformation of the test piece 30 into an electrical signal; that is, the fiber grating test line 120 is attached to the surface of the test piece 30 by an adhesive, and generates a wavelength variation signal due to strain by deformation of the test piece.
A computer 300 coupled to the fiber grating demodulator 200 and configured to receive the electrical signal converted by the fiber grating demodulator 200 and reconstruct and acquire data of the bending form of the test piece 30;
Wherein the X-axis direction, the Y-axis direction and the Z-axis direction are mutually perpendicular to each other.
Specifically, in performing a test on the test apparatus 1000, first, the positions of the two constraining assemblies 20 are adjusted on the optical flat 10 so that the two constraining assemblies 20 are arranged at intervals along the Y-axis direction and the jigs 23 of the two constraining assemblies 20 are on the same axis; then, the test piece 30 is mounted on the clamps 23 of the two restraint assemblies 20, and the test piece 30 is fixed by the two clamps 23; wherein, the angle scales 232 of the two ends of the test piece 30 on the clamp 23 have equal values and do not generate relative torsion or the two ends of the test piece 30 generate relative torsion; then, one constraint component 20 is used as a fixed end, the other constraint component 20 is used as a movable end, wherein the displacement of the fixed end in all directions is kept to be zero, and the movable end is moved along the X-axis direction to enable the test piece 30 to be in a two-dimensional bending state; continuing to adjust the Z-axis rotary table 22 of the movable end constraint assembly 20 to correspond to the bending state of the test piece 30; finally, reconstructing and collecting the bending form of the test piece 30 by the computer 300, comparing the bending form with a two-dimensional projection curve of the test piece 30 on the optical flat 10, and determining the curvature information reduction precision of the test piece 30; wherein, the test conditions that the angle scale 232 of the two ends of the test piece 30 on the fixture 23 is zero and no relative torsion occurs are removed, and the other test conditions further include: the computer 300 performs precision compensation, and compares the two-dimensional projection curve of the test piece 30 on the optical flat 10 and the curve before precision compensation to determine the curvature information restoring precision and compensation effect of the test piece 30. Compared with the traditional cantilever beam type testing device 1000 and the method, the special curvature bending of the test piece 30 can be realized through the fiber grating curvature sensing testing device, meanwhile, the rotation angle and the torsion angle of the test piece 30 in a two-dimensional bending state can be adjusted, the precision compensation testing of the two-dimensional bending superposition torsion angle of the test piece is facilitated, in addition, the testing device 1000 effectively inhibits the axial stretching of the test piece 30, and the measuring precision is improved.
In one example of the present invention, the Z-axis rotation table 22 includes:
a base 221 fixedly connected to the X-axis displacement table 21;
a rotating disc 222 pivotally connected to the base 221, and the clamp 23 is fixedly connected to the rotating disc 222;
a driving member 223 coupled to the rotating plate 222 and configured to drive the rotating plate 222 to perform a rotational movement with respect to the base 221;
in short, the rotation plate 222 is driven to rotate around the base 221 by the driving member 223, thereby driving the rotation of the jig 23 connected thereto.
For example, a rotation shaft 2214 is provided on the base 221, a pivot hole adapted to the rotation shaft 2214 is provided on the rotation plate 222, and when the rotation plate 222 is fitted on the base 221, the rotation plate 222 is defined on the rotation shaft 2214 of the base 221 by a bolt fastener, so that the rotation plate 222 can be rotationally driven along the circumferential direction of the rotation shaft 2214 of the base 221, and then driving of the clamp 23 on the rotation plate 222 is realized;
the reason why the clamp 23 is rotationally driven is that, during the movement of the X-axis displacement table 21 in the X-axis direction, the mounting hole 231 of the clamp 23 of the moving restraint assembly 20 is not aligned with the mounting hole 231 of the clamp 23 of the other restraint assembly 20, and the mounting holes 231 of the two restraint assemblies 20 are always aligned with each other by the rotation of the Z-axis rotary table 22.
In one example of the present invention, the driving member 223 includes:
a screw rod 2231 and a first connecting block 2232, wherein the first connecting block 2232 is fixedly connected with the screw rod 2231;
a threaded hole 2211 is formed on the base 221, and the screw rod 2231 is matched with the threaded hole 2211; for example, a connection table 2215 is disposed on the base 221 and near the rotating disc 222, and the threaded hole 2211 is formed on the connection table 2215;
wherein, a driving shaft 2221 is fixed on the rotating disc 222, and a first clamping groove 2233 matched with the driving shaft 2221 is formed along the circumferential direction of the first connecting block 2232.
For example, a knob is provided at one end of the screw rod 2231, and the screw rod 2231 is moved to one side of the screw hole 2211 coaxially provided by rotating the knob, and the drive shaft 2221 of the rotary plate 222 is engaged with the first clamp groove 2233, so that the rotary plate 222 is rotated by the connection block.
An efficient driving of the rotating disc 222 can be achieved by the above-described embodiments, thereby facilitating adjustment of the orientation of the clamp 23.
In one example of the present invention, the driving member 223 includes:
a sliding rod 2234 and a second connecting block 2235, wherein the second connecting block 2235 is fixedly connected with the sliding rod 2234, and a protruding part is arranged on the sliding rod 2234; a driving shaft 2221 is fixed on the rotating disc 222, and a second clamping groove 2236 adapted to the driving shaft 2221 is formed in the second connecting block 2235;
The base 221 is formed with a sliding track 2212, and a plurality of concave parts 2213 are disposed in the sliding track 2212, and the convex parts 2237 are clamped in any concave parts 2213 in the sliding track 2212;
for example, the recess 2213 provided inside the slide 2212 is formed by bending a spring sheet; a handle is disposed at one end of the slide rod 2234, so that the protrusion 2237 can be engaged with any one of the recess 2213 when the slide rod 2234 is driven; in the process that the protruding portion 2237 is movably matched with one of the recessed portions 2213, the protruding portion 2237 presses the recessed portion to deform and then move into the next recessed portion 2213.
In one example of the present invention, the Z-axis rotation table 22 further includes:
a stopper 224, the stopper 224 being connected between the base 221 and the rotating disc 222 and configured to be capable of switching movement between a first position defining a rotational movement of the rotating disc 222 with respect to the base 221 and a second position releasing the rotating disc 222 to be capable of rotational movement with respect to the base 221;
the position of the rotating disc 222 can be effectively fixed by arranging the limiting line, so that the rotating disc 222 is prevented from rotating in the test process to influence the test, and the test accuracy of the test device 1000 is improved.
For example, the limiting member 224 is a stud member, the rotating disc 222 is provided with a threaded hole 2211, the bolt member is adapted to the threaded hole 2211, when the relative position of the rotating disc 222 and the base 221 needs to be fixed by the limiting member 224, the end surface of the rotating disc is abutted against the base 221 by screwing the stud member; when the rotatable plate 222 is required to be released by the stopper 224, the end surface thereof is separated from the base 221 by screwing the stud member.
In one example of the present invention, an angle scale 232 is formed in the circumferential direction of the jigs 23, and both ends of the test piece 30 can be fixed at a designated torsion angle and/or rotation angle when the test piece 30 is fixedly installed between the two jigs 23;
that is, the angle graduations 232 are marked in the circumferential direction of the mounting hole 231 of each jig 23, and the test conditions of the test piece 30 can be accurately controlled by providing the angle graduations 232; for example, 1, both ends of the test piece 30 are positioned at a zero degree rotation angle; for example, 2, both ends of the test piece 30 are positioned at a rotation angle of 10 degrees; for example, 3, one of the two ends of the test piece 30 is located at a rotation angle of zero degrees, and the other end is located at a torsion angle of 10 degrees; for example, 4, the test piece 30 has one end located at a rotation angle of 10 degrees and the other end located at a torsion angle of 20 degrees.
In one example of the present invention, the fiber grating test line 210 is disposed along the extending direction of the test piece 30, and forms a plurality of grating detection points 30A on the surface of the test piece 30 by bonding with an adhesive at equal intervals;
by arranging the fiber bragg grating test line 210 along the extending direction of the test piece 30, the deformation change of the test piece 30 can be accurately monitored, and then the optical signal of the wavelength change caused by the monitored strain is converted into an electrical signal.
In one example of the present invention, the optical plate 10 and the X-axis displacement table 21 are connected by a fastener;
a plurality of first positioning holes 11 are formed at least along the X-axis direction of the optical plate 10;
a plurality of second positioning holes are formed in the X-axis displacement table 21;
the second positioning holes are correspondingly connected with the corresponding first positioning holes 11, and the fasteners sequentially penetrate through the first positioning holes 11 and the second positioning holes;
preferably, the first positioning holes 11 are arranged in an array on the optical flat 10 along the X-axis direction and the Y-axis direction. For example, the optical plate 10 has threaded holes with an array distance of 25mm by 25mm, which can be used for fixation and two-dimensional coordinate determination of the restraint assembly 20.
By the above-described structure, the X-axis displacement stage 21 can be moved in the X-axis direction on the optical flat 10, thereby realizing adjustment of the test piece 30 in a bent state.
Preferably, the X-axis displacement table 21 may also be a telescopic member, which may include a cylinder and a piston plate that is telescopic in the cylinder, where the cylinder is connected to the optical flat 10 by the above-mentioned fastening member, and the piston plate is fixedly connected with the Z-axis rotation table 22, so that when the movement in the X-axis direction needs to be achieved, the telescopic member may be realized by the telescopic member of the X-axis displacement table 21, or may be realized by the fastening member connection between the cylinder and the optical flat 10.
It can be understood that when the adjustment displacement is required to be larger than the interval of the first positioning holes 11 of the optical flat plate 10, the adjustment is realized by adjusting the fixed position of the X-axis displacement table 21 on the optical flat plate 10; when the adjustment displacement is smaller than the interval of the first positioning holes 11 of the optical flat plate 10, the X-axis displacement table 21 is adjusted to perform the extending action.
In one example of the present invention, the fixture 23 includes a mounting hole 231 penetrating the fixture 23 and a notch 233 opened on the fixture 23 and communicating with the mounting hole 231; wherein a bolt member 234 is connected to the notch 233 of the clamp 23, and the tightness of the notch 233 is adjusted by the bolt member 234 to fix or release the test piece 30;
That is, a connection hole is formed in the fixture 23, the connection hole penetrates through the notch 233, the bolt member 234 is connected in the connection hole, and the gap size of the notch 233 is adjusted through the bolt member 234 so as to adjust the inner diameter of the mounting hole 231, and finally, tightness adjustment of the test piece 30 is achieved.
A testing method of the optical fiber grating curvature sensing testing device 1000 according to the second aspect of the present invention includes the following steps:
s11: adjusting the positions of the two restraint assemblies 20 on the optical flat 10 so that the two restraint assemblies 20 are arranged at intervals along the Y-axis direction and the clamps 23 of the two restraint assemblies 20 are positioned on the same axis;
s12: mounting the test piece 30 on the jigs 23 of the two restraint assemblies 20, and fixing the test piece 30 by the two jigs 23; wherein, the angle scales 232 of the two ends of the test piece 30 on the fixture 23 as claimed in claim 5 are equal in value and do not twist relatively;
s13: taking one constraint component 20 as a fixed end and the other constraint component 20 as a movable end, wherein the displacement of the fixed end in all directions is kept to be zero, and the movable end is moved along the X axis direction to enable the test piece 30 to be in a two-dimensional bending state;
S14: adjusting the Z-axis rotary table 22 of the movable end constraint assembly 20 to correspond to the bending state of the test piece 30;
s15: reconstructing and collecting the bending form of the test piece 30 by the computer 300, comparing the bending form with a two-dimensional projection curve of the test piece 30 on the optical flat 10, and determining the curvature information reduction precision of the test piece 30;
that is, the test method can test the test piece 30 under two working condition types; one of them is to fixedly connect both ends of the test piece 30 to the position where the rotation angle of the clamp 23 is zero degrees, and move along the X axis direction through the movable end; the other is to fixedly connect both ends of the test piece 30 to the position where the rotation angle of the clamp 23 is non-zero (for example, 10 degrees), and move the movable end along the X-axis direction.
It should be noted that, the rotation angle of the test piece 30 is based on the position of the fiber bragg grating test line 210, for example, when the rotation angle is zero degrees, the fiber bragg grating test line 210 is aligned with 0 ° of the angle scale 232 on the fixture 23; for another example, when the rotation angle is a specified angle, the fiber grating test line 210 is aligned with the specified angle of the angle scale 232 on the jig 23.
Compared with the traditional cantilever beam type fiber grating curvature sensing test device and method, the fiber grating curvature sensing test method can achieve specific curvature bending of the test piece, can adjust the rotation angle and the torsion angle of the test piece in a two-dimensional bending state, is beneficial to developing an accuracy compensation test of the two-dimensional bending superposition torsion angle of the test piece, and in addition, the method effectively inhibits axial stretching of the test piece and improves measurement accuracy.
In one example of the present invention, when the angle scale 232 of the two ends of the test piece 30 on the fixture 23 is non-zero, the method further includes, after step S15:
the computer 300 performs precision compensation, and compares the two-dimensional projection curve of the test piece 30 on the optical flat 10 and the curve before precision compensation to determine the curvature information restoring precision and compensation effect of the test piece 30.
A testing method of the optical fiber grating curvature sensing testing device 1000 according to the third aspect of the present invention includes the following steps:
s21: adjusting the positions of the two restraint assemblies 20 on the optical flat 10 so that the two restraint assemblies 20 are arranged at intervals along the Y-axis direction and the clamps 23 of the two restraint assemblies 20 are positioned on the same axis;
S22: mounting the test piece 30 on the jigs 23 of the two restraint assemblies 20, and among both ends of the test piece 30, one end is twisted by a designated angle with respect to the other end, and both ends of the test piece 30 are fixed by the two jigs 23;
s23: taking one constraint component 20 as a fixed end and the other constraint component 20 as a movable end, wherein the displacement of the fixed end in all directions is kept to be zero, and the movable end is moved along the X axis direction to enable the test piece 30 to be in a two-dimensional bending and torsion state;
s24: adjusting the Z-axis rotary table 22 of the movable end constraint assembly 20 to correspond to the bending state of the test piece 30;
s25: reconstructing and collecting the bending form of the test piece 30 by the computer 300, comparing the bending form with a two-dimensional projection curve of the test piece 30 on the optical flat 10, and determining the curvature information reduction precision of the test piece 30;
s26: the computer 300 performs precision compensation, and compares the two-dimensional projection curve of the test piece 30 on the optical flat 10 and the curve before precision compensation to determine the curvature information restoring precision and compensation effect of the test piece 30.
It should be noted that, the rotation angle of the test piece 30 is based on the position of the fiber bragg grating test line 210, for example, when the rotation angle is zero degrees, the fiber bragg grating test line 210 is aligned with 0 ° of the angle scale 232 on the fixture 23; for another example, when the rotation angle is a specified angle, the fiber grating test line 210 is aligned with the specified angle of the angle scale 232 on the jig 23.
That is, the test method can test the test piece 30 under two working condition types; one of them is that one of the two ends of the test piece 30 is located at a zero degree position, the other end is twisted by a designated angle, the two ends of the test piece 30 are fixed by two clamps 23, and the movable end moves along the X axis direction; the other is that of the two ends of the test piece 30, one of which is located at a non-zero degree position, and the other of which is twisted by a prescribed angle, and the two ends of the test piece 30 are fixed by the two jigs 23 and moved in the X-axis direction by the movable ends.
Compared with the traditional cantilever beam type fiber grating curvature sensing test device and method, the fiber grating curvature sensing test method can achieve specific curvature bending of the test piece, can adjust the rotation angle and the torsion angle of the test piece in a two-dimensional bending state, is beneficial to developing an accuracy compensation test of the two-dimensional bending superposition torsion angle of the test piece, and in addition, the method effectively inhibits axial stretching of the test piece and improves measurement accuracy.
The method for curvature compensation of the test piece is as follows:
s10: the angle sensor monitors the difference value at two ends of the test piece to obtain the torsion angle of the test piece Monitoring the center wavelength of each grating measuring point on the test piece by a fiber bragg grating test line 120;
s20: positive strain ε perceived by computer 300 to fiber bragg grating test line 120 based on grating wavelength variation a Correcting;
s30: sensing strain epsilon by computer 300 based on modified fiber bragg grating test line 120 a And correcting the curvature of the test piece subjected to the superposition of bending and torsion, and obtaining the curvature K of the position of the grating measuring point after torsion compensation.
Specifically, the derivation formula for the correction of the bending of the test piece to cause the fiber grating to generate positive strain is as follows:
when the test piece is bent and twisted, the fiber bragg grating string 30 adhered to the base material of the test piece is unfolded, and according to the geometric relationship, the following formula holds:
in the embodiment, the length of the fiber bragg grating test line 120 under the superposition of bending and torsion is l ε The axial strain of the fiber grating is epsilon, epsilon a Positive strain, ε, is generated by fiber grating for bending test piece t And generating a shear strain for the fiber bragg grating caused by torsion of the test piece.
The joint solution reduction can be obtained according to the formula:
the axial strain of the fiber grating epsilon according to the grating wavelength variation delta lambda can be expressed as:
sensing positive strain ε from the sensor fiber grating test line 120 described above a Bending of the test piece obtained by combining with the axial strain epsilon of the fiber grating causes the fiber grating to generate positive strain epsilon a ：
Wherein,,
the correction expression of the curvature K of the position where the grating measuring point 30A is located after torsion compensation is as follows:
wherein r is the distance from the fiber bragg grating to the centroid,is the torsion error angle of the test piece of the scraper conveyor, l is the length of the test piece of the scraper conveyor, delta lambda is the variation of grating wavelength, lambda B The initial wavelength of the fiber grating is M, and the curvature sensitivity coefficient of the fiber grating is M.
Note that, m= (1-P e )λ B r, which is a quantity related to the collection of fiber gratings and sensors. When the test piece is finished and works according to the theoretical condition, M is a fixed value. Therefore, the formula for M can be reduced to km=Δλ B 。
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
(a) Two-dimensional bending test of test piece 30 without torque
Table a is a list of two-dimensional bending test parameters for a test piece without a knob
Scheme a:
as can be seen from the analysis of fig. 6 and 7, after the surface strain data of the sensing substrate is sensed based on the fiber bragg grating and converted into discrete curvature information, the deformation inversion reconstruction can be realized through a slope recurrence algorithm, and the offset of the sensing substrate at the 400mm position is determined to be 8.30mm through the two-dimensional projection coordinate reading; even in the absence of rotational and torsional error angles, the absolute error of the inversion curve gradually increases with increasing number of recursions, which has reached 2.14mm when recursively moved to 400mm positions on a 500mm long sensing substrate.
(b) Test piece 30 two-dimensional bending+rotation test
Table b is a list of two-dimensional bending and rotation test parameters for the test piece
(1) Scheme B1:
as can be seen from the analysis of fig. 8 and 9, when the rotation error angle is 30 °, the reconstruction curve obtained by performing slope recurrence on the curvature value compensated by the rotation error angle accuracy compensation model is significantly better than the uncompensated reconstruction curve. The end error of the inversion reconstruction curve before precision compensation is obviously increased compared with the scheme A, the value of the end error is 2.68mm, the end error of the inversion reconstruction curve after precision compensation is 2.12mm, and the end precision of the reconstruction curve is improved by 6.78% compared with the reconstruction curve before precision compensation.
(2) Scheme B2:
as can be seen from the analysis of fig. 10 and 11, when the rotation error angle is 45 °, the error of the reconstructed curve obtained by performing slope recurrence on the curvature value after the precision compensation is greatly reduced. The end error of the inversion reconstruction curve before precision compensation is increased compared with the solution A and the solution B1, the value of the inversion reconstruction curve is 3.33mm, the end error of the inversion reconstruction curve after precision compensation is 2.13mm, and the end precision of the reconstruction curve is improved by 14.46% compared with the reconstruction curve before precision compensation.
(c) Test piece 30 two-dimensional bending+torsion test
Table c is a list of two-dimensional bending and torsion test parameters for the test piece
(1) Scheme C1
As can be seen from the analysis of fig. 12 and 13, when the torsional error angle is 10 °, the reconstructed curve obtained by performing slope recurrence on the curvature value compensated by the torsional error angle accuracy compensation model is better than the uncompensated reconstructed curve. The end error of the inversion reconstruction curve before precision compensation is obviously increased compared with the scheme A, the value of the end error is 2.39mm, the end error of the inversion reconstruction curve after precision compensation is 2.16mm, and the end precision of the reconstruction curve is increased by 2.77% compared with the reconstruction curve before precision compensation.
(2) Scheme C2
As can be seen from the analysis of fig. 14 and 15, the error of the reconstructed curve obtained by performing slope recurrence on the curvature value after the accuracy compensation is reduced when the torsion error angle is 20 °. The end error of the inversion reconstruction curve before precision compensation is increased compared with the solution A and the solution C1, the value of the end error is 2.43mm, the end error of the inversion reconstruction curve after precision compensation is 2.27mm, and the end precision of the reconstruction curve is increased by 1.93% compared with the end precision before precision compensation.
While exemplary implementations of the fiber grating curvature sensing test device 1000 and the test method thereof according to the present invention have been described in detail with reference to preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made to the specific embodiments described above without departing from the spirit of the invention, and various technical features and structures of the present invention may be combined without departing from the scope of the invention, which is defined in the appended claims.
Claims (10)
1. A fiber grating curvature sensing test device, comprising:
a test platform (100), comprising: optical flat (10) and along restraint subassembly (20) of two relative positions on optical flat (10) of Y axle direction interval setting, be connected with test piece (30) between two restraint subassemblies (20), wherein, restraint subassembly (20) include: an X-axis displacement table (21), a Z-axis rotating table (22) and a clamp (23), wherein the X-axis displacement table (21) is connected to the optical flat (10) and can move along the X-axis direction, one end of the Z-axis rotating table (22) is connected with the X-axis displacement table (21), the other end of the Z-axis rotating table is connected with the clamp (23), the Z-axis displacement table is configured to drive the clamp (23) to rotate around the Z-axis direction, and the clamp (23) is configured to be fixedly connected with the test piece (30); the test piece (30) is an elastic material piece;
the fiber bragg grating demodulator (200) is connected to the surface of the test piece (30) through a fiber bragg grating test wire (210) and is configured to convert an optical signal of the wavelength variation monitored by the fiber bragg grating test wire (210) based on the deformation of the test piece (30) into an electrical signal;
a computer (300) coupled to the fiber optic grating demodulator (200) and configured to receive the electrical signal converted by the fiber optic grating demodulator (200) and reconstruct and acquire data from the curved configuration of the test piece (30);
Wherein the X-axis direction, the Y-axis direction and the Z-axis direction are mutually perpendicular to each other.
2. The fiber bragg grating curvature sensing device according to claim 1, wherein,
the Z-axis rotary table (22) includes:
a base (221) fixedly connected to the X-axis displacement table (21);
a rotating disc (222) pivotally connected to the base (221), and the clamp (23) is fixedly connected to the rotating disc (222);
and a driving member (223) connected to the rotating disk (222) and configured to drive the rotating disk (222) to perform a rotational movement with respect to the base (221).
3. The fiber bragg grating curvature sensing device according to claim 2, wherein,
the driving member (223) includes:
a screw rod (2231) and a first connecting block (2232), wherein the first connecting block (2232) is fixedly connected with the screw rod (2231);
a threaded hole (2211) is formed in the base (221), and the screw rod (2231) is matched with the threaded hole (2211);
wherein, a driving shaft (2221) is fixed on the rotating disc (222), and a first clamping groove (2233) matched with the driving shaft (2221) is formed along the circumferential direction of the first connecting block (2232).
4. The fiber bragg grating curvature sensing device according to claim 2, wherein,
The driving member (223) includes:
the device comprises a sliding rod (2234) and a second connecting block (2235), wherein the second connecting block (2235) is fixedly connected with the sliding rod (2234), and a protruding part (2237) is arranged on the sliding rod (2234); wherein, a driving shaft (2221) is fixed on the rotating disc (222), and a second clamping groove (2236) which is matched with the driving shaft (2221) is arranged on the second connecting block (2235);
the base (221) is provided with a sliding rail (2212), a plurality of concave parts (2213) are arranged in the sliding rail (2212), and the convex parts (2237) are clamped with any concave parts (2213) in the sliding rail (2212).
5. The fiber bragg grating curvature sensing device according to claim 2, wherein,
the Z-axis rotary table (22) further includes:
a stop (224), the stop (224) being connected between the base (221) and the rotating disc (222) and being configured to be able to switch between a first position defining a rotational movement of the rotating disc (222) with respect to the base (221) and a second position releasing the rotating disc (222) to be able to perform a rotational movement with respect to the base (221).
6. The fiber bragg grating curvature sensing device according to claim 1, wherein,
An angle scale (232) is formed in the circumferential direction of the jigs (23), and when the test piece (30) is fixedly installed between the jigs (23), both ends of the test piece (30) can be fixed at a designated torsion angle and/or rotation angle.
7. The fiber bragg grating curvature sensing device according to claim 1, wherein,
the fiber grating test line (210) is arranged along the extending direction of the test piece (30), and a plurality of grating detection points (30A) are formed on the surface of the test piece (30) through bonding of adhesives at equal intervals.
8. A method of testing a fiber bragg grating curvature sensing testing device according to any of claims 1 to 7, comprising the steps of:
s11: adjusting the positions of the two restraint assemblies (20) on the optical flat (10) so that the two restraint assemblies (20) are arranged at intervals along the Y-axis direction, and the clamps (23) of the two restraint assemblies (20) are positioned on the same axis;
s12: mounting the test piece (30) on the clamps (23) of the two restraint assemblies (20), and fixing the test piece (30) through the two clamps (23); wherein the two ends of the test piece (30) have equal values of the angle scales (232) on the clamp (23) according to claim 5 and do not twist relatively;
S13: taking one constraint component (20) as a fixed end and the other constraint component (20) as a movable end, wherein the displacement of the fixed end in all directions is kept to be zero, and the movable end is moved along the X-axis direction to enable the test piece (30) to be in a two-dimensional bending state;
s14: adjusting the Z-axis rotary table (22) of the movable end constraint assembly (20) to correspond to the bending state of the test piece (30);
s15: and reconstructing and collecting data of the bending form of the test piece (30) by a computer (300), comparing the two-dimensional projection curve of the test piece (30) on the optical flat (10), and determining the curvature information reduction precision of the test piece (30).
9. The method for testing the curvature of a fiber grating according to claim 8, wherein,
when the angle scales (232) of the two ends of the test piece (30) on the clamp (23) are non-zero, the method further comprises the following steps after the step S15:
the computer (300) performs precision compensation, and compares the two-dimensional projection curve of the test piece (30) on the optical flat plate (10) with the curve before precision compensation to determine the curvature information recovery precision and compensation effect of the test piece (30).
10. A method of testing a fiber bragg grating curvature sensing testing device according to any of claims 1 to 7, comprising the steps of:
S21: adjusting the positions of the two restraint assemblies (20) on the optical flat (10) so that the two restraint assemblies (20) are arranged at intervals along the Y-axis direction, and the clamps (23) of the two restraint assemblies (20) are positioned on the same axis;
s22: mounting a test piece (30) on the clamps (23) of the two restraint assemblies (20), and in the two ends of the test piece (30), twisting one end by a specified angle relative to the other end, and fixing the two ends of the test piece (30) through the two clamps (23);
s23: taking one constraint component (20) as a fixed end and the other constraint component (20) as a movable end, wherein the displacement of the fixed end in all directions is kept to be zero, and the movable end is moved along the X-axis direction to enable the test piece (30) to be in a two-dimensional bending and torsion state;
s24: adjusting the Z-axis rotary table (22) of the movable end constraint assembly (20) to correspond to the bending state of the test piece (30);
s25: reconstructing and collecting data of the bending form of the test piece (30) by a computer (300), comparing the two-dimensional projection curve of the test piece (30) on the optical flat (10), and determining the curvature information reduction precision of the test piece (30);
s26: the computer (300) performs precision compensation, and compares the two-dimensional projection curve of the test piece (30) on the optical flat plate (10) with the curve before precision compensation to determine the curvature information recovery precision and compensation effect of the test piece (30).
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