CN102466469A - Measuring device of spring type bending parameter based on fiber bending loss and method thereof - Google Patents
Measuring device of spring type bending parameter based on fiber bending loss and method thereof Download PDFInfo
- Publication number
- CN102466469A CN102466469A CN201010532007XA CN201010532007A CN102466469A CN 102466469 A CN102466469 A CN 102466469A CN 201010532007X A CN201010532007X A CN 201010532007XA CN 201010532007 A CN201010532007 A CN 201010532007A CN 102466469 A CN102466469 A CN 102466469A
- Authority
- CN
- China
- Prior art keywords
- bending
- spring type
- loss
- optical fiber
- signal optical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a measuring device of a spring type bending parameter based on fiber bending loss. The device comprises a spring type member formed by a spring wire. A first lower deformation tooth of a lower surface of an upper spring wire and a first upper deformation tooth of an upper surface of a lower spring wire in two adjacent spring wires are in interleaving correspondence. A first signal fiber is clamped between the first lower deformation tooth and the first upper deformation tooth. The first signal fiber is connected with a test unit through a transmission fiber. The test unit is connected with a processing unit. In addition, the invention also relates to a measuring method of the above bending parameter. The method comprises the following steps: calibration of an optical signal loss change value of the first signal fiber and a proportion factor of bending curvature of the spring type member; acquisition of a loss change value of an optical signal transmitted by the first signal fiber; provision of the bending curvature of an object to be measured by the processing unit by utilizing the first signal fiber loss change value and a formula 1. According to the device and the method in the invention, the bending curvature of the object to be measured can be determined, and a bending direction of the object to be measured can be determined.
Description
Technical field
The present invention relates to a kind of measurement mechanism and method of technical field of optical fiber sensing, particularly a kind of determinator and method of the spring type bending parameter based on bending loss of optical fiber.
Background technology
Along with the development of intelligence machines such as bionical thing machine, intelligent robot, virtual hand, be absolutely necessary for the monitoring of the limbs joint of such machine motion, wherein bending curvature and bending direction are the unusual parameters of key; Present measuring method has electric method, optical method and traditional optical Fiber Method, and the above two structural principles are complicated, and cost is high; Error is bigger; And need complicated circuitry, software systems support, relatively difficulty is promoted in practical application, and relatively is typically the fiber grating method in the existing optical Fiber Method; Patent like one Chinese patent application numbers 200510024425.7,200710043767.2 and 200780039102.2 all is to adopt this method; Though have greatly improved than the above two, its shortcoming is quite a few, like cost still than higher; Need to use the higher fiber grating demodulation equipment of price, cost significantly increases in the time of particularly need carrying out multimetering; Simultaneously fiber grating is a kind ofly in use need increase extra step and eliminate Influence of Temperature temperature and all highstrung sensing element of stress, has further increased the cost of total system; Be that fiber grating is relatively more fragile in addition; To being packaged with higher requirement; Should guarantee the susceptibility of sensing element, guarantee that again be the comparison difficulty serviceable life, encapsulation generally will account for 30% to 90% of sensing element cost; This has strengthened the cost of system again, thereby has limited the usable range of such device and method.
Summary of the invention
The objective of the invention is to overcome above-mentioned deficiency of the prior art, a kind of determinator and method of the spring type bending parameter based on bending loss of optical fiber is provided.The present invention not only can measure the bending curvature of object under test, and can accomplish to measure crooked direction simultaneously.
For realizing above-mentioned purpose; The technical scheme that the present invention adopts is: based on the determinator of the spring type bending parameter of bending loss of optical fiber; It is characterized in that: comprise that two ends are fixed in whole spiral many wound springs type member that is made up of spring wire on the object under test; Upper surface and lower surface upper edge spring wire at spring wire vertically are laid with a plurality of distortion teeth continuously; The distortion tooth is staggered corresponding on on the lower surface of the upper spring silk in the two adjacent rings spring wire first time distortion tooth and the lower spring silk upper surface first, and the tooth pitch between the distortion tooth is uniformly between first time distortion tooth and on first, said be out of shape to be out of shape between the tooth on the tooth and first for first time accompany first signal optical fibre; Said first signal optical fibre is connected with test cell through Transmission Fibers, and said test cell is connected with processing unit.
The determinator of above-mentioned spring type bending parameter based on bending loss of optical fiber is provided with elastomeric layer between the upper surface of the spring wire of described formation spring type member and the lower surface.
The determinator of above-mentioned spring type bending parameter based on bending loss of optical fiber; Be included in the secondary signal optical fiber of laying side by side with first signal optical fibre on the spring wire surface; And be laid in continuously on second on second time distortion tooth and the second group of a plurality of lower spring silk upper surface on the lower surface of second group of a plurality of upper spring silk of said spring wire and be out of shape tooth; Said secondary signal fibre clip is held on second time distortion tooth and second is out of shape between the tooth; The distortion tooth is one-period along per 360 degree of spring type member on said second time distortion tooth and second; The starting point in each cycle is positioned at the same direction of spring type member, and as zero degree, the spacing or the tooth depth of the distortion tooth in each cycle are monotone variation; And the spacing of the distortion tooth of different cycles or tooth depth are that monotone variation and variation tendency are consistent, and said second signal optical fibre is connected with test cell through Transmission Fibers.
The determinator of above-mentioned spring type bending parameter based on bending loss of optical fiber; It is characterized in that: do not intersect between each cycle; Each cycle is divided into limited the zone of equal number, is identical corresponding to the spacing or the tooth depth of the distortion tooth in the corresponding region on each cycle of the same direction of spring type member (25).
The determinator of above-mentioned spring type bending parameter based on bending loss of optical fiber, said spring type member is connected with test cell through photoswitch.
Assay method based on the spring type bending parameter of bending loss of optical fiber may further comprise the steps:
The demarcation of the scale factor of step 1, the light signal loss changing value that is included in first signal optical fibre in the spring type member and spring type member bending curvature:
The method of demarcating: the length that will contain the spring type member of first signal optical fibre locks under original state or linear state; Utilize the circular arc of known bending curvature; The spring type member that will contain first signal optical fibre is crooked according to circular arc; And be recorded in the loss changing value of first signal optical fibre under the respective curved curvature, and utilize the method for resulting The data interpolation and linear fit to obtain the scale factor K of bending curvature and signal optical fibre loss changing value, its relation can be expressed as:
C
I=K Δ α
I+ ε formula one
In the formula: C
IThe different bending curvature value of expression timing signal, Δ α
IBe the loss changing value of light signal under the differently curved curvature of expression, K is the scale factor that obtains, and ε is the error amount that obtains;
The collection of the loss changing value of the light signal of step 2, the transmission of first signal optical fibre: the spring type member that contains first signal optical fibre that two ends are fixed on the object under test is crooked along with the bending of object under test; The loss value of first signal optical fibre also changes thereupon; Obtain the loss changing value of first signal optical fibre through test cell; And this value passed to processing unit; Wherein, spring type member its length when original state or linear state of being fixed on the object under test of two ends is consistent with the length of timing signal;
Step 3, processing unit utilize the first signal optical fibre loss changing value and formula one to provide the bending curvature of object under test.
The assay method of above-mentioned spring type bending parameter based on bending loss of optical fiber is characterized in that, after step 3 is accomplished, carries out following steps:
The demarcation of the scale factor of step 4, the light signal loss changing value that is included in the secondary signal optical fiber in the spring type member and spring type member bending curvature and bending direction:
The method of demarcating: the circular arc that utilizes known bending curvature; The different angle of spring type member conversion that will contain secondary signal optical fiber accordings to the circular arc bending; And the loss changing value of secondary signal optical fiber under record respective curved curvature and the respective angles, utilize the method for resulting The data interpolation and linear fit to obtain the scale factor K of angle θ and the secondary signal fibre loss changing value and the bending curvature changing value of bending direction
θ(C), its relation can be expressed as:
θ=K
θ(C) Δ α
θ+ ε
θFormula two
In the formula: θ representes the bending direction angle that timing signal is different, and C representes the timing signal bending curvature, Δ α
θBe the loss changing value of light signal under differently curved orientation angle of expression and the differently curved curvature, K
θ(C) be scale factor under the differently curved curvature that obtains, ε
θBe the error amount that obtains;
The collection of the loss changing value of the light signal of step 5, secondary signal Optical Fiber Transmission: the spring type member that contains secondary signal optical fiber that two ends are fixed on the object under test is crooked along with the bending of object under test; The loss value of secondary signal optical fiber is also along with the variation of the bending curvature of object under test and bending direction angle and change; Obtain the loss changing value of secondary signal optical fiber through test cell, and this value is passed to processing unit;
The bending direction angle that step 6, processing unit utilize bending curvature that secondary signal fibre loss changing value, first signal optical fibre confirm and formula two to provide object under test.
The assay method of above-mentioned spring type bending parameter based on bending loss of optical fiber; It is characterized in that: when object under test has more than one bending curvature to be measured; All be mounted with two ends at corresponding position and be fixed in the spring type member that contains signal optical fibre on the object under test, and first signal optical fibre in the said spring type member is cascaded.
The assay method of above-mentioned spring type bending parameter based on bending loss of optical fiber; When object under test is when being made up of a plurality of flexible parts; Processing unit can provide the end-state of this object under test through confirming the bending curvature and the bending direction of its initial and final various piece.
The present invention compared with prior art has the following advantages: the present invention provides a kind of determinator and method of the spring type bending parameter based on bending loss of optical fiber; Not only can measure the bending curvature of determinand; And can accomplish to measure crooked direction simultaneously, make this bending parameter determinator have wide usable range.Apparatus structure according to the invention is simple, reasonable in design, processing and fabricating is convenient and use-pattern is flexible, highly sensitive, result of use is good, and anti-electromagnetic interference (EMI), cost are low; Again because this device is based on the loss basis of optical fiber measures; And loss test is the basis of other class testings such as all interferometric methods, frequency method in the test optical fiber; Also be the technology the most ripe, the most stable, that cost is minimum, make device of the present invention on cost, have sizable advantage.And time division technique capable of using, optical time domain reflection technology (OTDR) and coincidence frequency modulated continuous wave technology (FMCW) can realize quasi-distributed or distributed measurement, for the application of device of the present invention further provides boundless application prospect.
Through accompanying drawing and embodiment, technical scheme of the present invention is done further detailed description below.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention 1.
Fig. 2 is the broken section structural representation of Fig. 1 medi-spring type member.
Fig. 3 is the structural representation of the embodiment of the invention 2.
Fig. 4 is the structural representation of the embodiment of the invention 3.
Fig. 5 is the structural representation of the embodiment of the invention 4.
Fig. 6 is the structural representation of the embodiment of the invention 6.
Description of reference numerals:
The 1-Transmission Fibers; The 4-spring wire; The 5-test cell;
6-first signal optical fibre; The 7-processing unit; The 8-elastomeric layer;
9-secondary signal optical fiber; The 10-object under test; 11-spring wire upper surface layer;
12-spring wire undersurface layer; The 20-display unit; 25-spring type member;
The 30-photoswitch; First time distortion of 4-1-tooth; Be out of shape tooth on the 4-2-first;
Second time distortion of 4-3-tooth; Be out of shape tooth on the 4-4-second; The 40-temperature sensor.
Embodiment
Determinator like Fig. 1, a kind of spring type bending parameter based on bending loss of optical fiber shown in Figure 2; Comprise that two ends are fixed in whole spiral many wound springs type member 25 that is made up of spring wire 4 on the object under test 10; Upper surface and lower surface upper edge spring wire 4 at spring wire 4 vertically are laid with a plurality of distortion teeth continuously; Distortion tooth 4-2 interlocks corresponding on on the lower surface of the upper spring silk in the two adjacent rings spring wire 4 first time distortion tooth 4-1 and the lower spring silk upper surface first; And on first time distortion tooth 4-1 and first, be out of shape between the tooth 4-2 and accompany first signal optical fibre 6; The two ends of spring type member 25 are fixed on the object under test 10; Along with making the distance that has in the spring type member 25 between the two adjacent coil spring silks 4, the variation of object under test 10 bending curvatures changes; Thereby make on first time distortion tooth 4-1 and first in these two adjacent coil spring silks 4 and be out of shape position change between the tooth 4-2; Be clipped in that bending curvature that both are out of shape first signal optical fibre 6 of between cog changes and the variable power that causes the light signal of transmission in first signal optical fibre 6 thereby make, first signal optical fibre 6 is connected with test cell 5 through Transmission Fibers 1, and test cell 5 connects processing unit 7 at the back.
In the present embodiment; Said spring type member 25 integral body shape and two ends in the shape of a spiral are fixed on the object under test 10; And the zone crooked to be measured of object under test 10 is enclosed in the spring type member 25; When the bending curvature of object under test 10 changes; The position at spring type member 25 two ends also changes, and the while has also just changed along the distance between the distortion tooth 4-2 on a plurality of first time distortion tooth 4-1 and a plurality of first of spring wire 4 upper and lower surfaces distribution, thereby just can change the bending radius of on first time distortion tooth 4-1 and first, being out of shape first signal optical fibre 6 that accompanies between tooth 4-2; Also promptly change the bending loss coefficient of first signal optical fibre 6; Preferred way is to be under the state of straight line in original state or spring type member 25 integral body, makes the bending curvature of first signal optical fibre 6 very little, and its bending loss value can be ignored; And between the tooth depth of distortion tooth 4-2 on all first time distortion tooth 4-1 and all first, the first time distortion tooth 4-1 and on first the tooth pitch between the distortion tooth 4-2 and all first time distortion tooth 4-1 with all on first the bending curvature that contacts fiber section of distortion tooth 4-2 be identical; Integral body presents spiral helicine spring type member 25 when bending like this, and the loss of first signal optical fibre 6 that loosens the zone of partial spring type member 25 can not change and need not consider, and the decay that occur light signal owing to the bending curvature that changes first signal optical fibre 6 is just understood in the zone that compresses of spring type member 25; Variation along with the curvature of object under test 10; The loss of the light signal of transmission also changes in first signal optical fibre 6, thereby on test cell 5, detects the variation of light signal and pass the signal along to processing unit 7, and processing unit 7 is according to prior demarcation; The bending curvature that different attenuation loss is corresponding different, thus the bending curvature of object under test 10 just can be obtained.
Assay method based on the spring type bending parameter of bending loss of optical fiber may further comprise the steps:
The demarcation of the scale factor of step 1, the light signal loss changing value that is included in first signal optical fibre 6 in the spring type member 25 and spring type member 25 bending curvatures:
The method of demarcating: the length that will contain the spring type member 25 of first signal optical fibre 6 locks under original state or linear state; Locking means is to be fixed in flexible the two ends of spring type member 25 but on the rhabodoid that length variations is ignored, rhabodoid can be metal bar, metal tube or macromolecular material rod.
The circular arc and the known uniform temperature that utilize known bending curvature are after the match; The spring type member 25 that will contain first signal optical fibre 6 is crooked according to circular arc; And be recorded in the loss changing value of first signal optical fibre 6 under respective curved curvature and the temperature; Utilize the method for resulting The data interpolation and linear fit to obtain the scale factor K of bending curvature and signal optical fibre loss changing value, its relation can be expressed as:
C
I=K Δ α
I+ ε formula one
In the formula: C
IThe different bending curvature value of expression timing signal, Δ α
IBe the loss changing value of light signal under the differently curved curvature of expression, K is the scale factor that obtains, and ε is the error amount that obtains;
The collection of the loss changing value of the light signal of step 2,6 transmission of first signal optical fibre: spring type member 25 bending along with the bending of object under test 10 that contains first signal optical fibre 6 on the object under test 10 is fixed at two ends; The loss value of first signal optical fibre 6 also changes thereupon; Through the loss changing value of test cell 5 picked up signal optical fiber 6, and this value passed to processing unit 7;
Step 3, processing unit 7 utilize signal optical fibre 6 loss changing values, formula one to provide the bending curvature of object under test 10.
Preferred way is to need the influence of account temperature to light signal, i.e. the loss changing value of light signal under differently curved curvature and uniform temperature, formula one C in the step 1 at this moment
I=K Δ α
IΔ α among the+ε
IThe loss changing value of promptly representing light signal under differently curved curvature and the temperature in step 2, is passed to processing unit 7 through the temperature sensor 40 that is connected with processing unit 7 with temperature parameter.
Said first signal optical fibre 6 is for the outside optical fiber that is surrounded by multi-protective layer, like tight tube fiber, carbon coated fiber, polyimide coated optical fiber etc.; Said first signal optical fibre 6 also can be plastic optical fiber or photonic crystal fiber.
Embodiment 2
As shown in Figure 3; In the present embodiment; Different with embodiment 1 is: be provided with elastomeric layer 8 between the upper surface of the spring wire 4 of described formation spring type member 25 and the lower surface, promptly described spring wire 4 be that trilaminate material by spring wire upper surface layer 11, elastomeric layer 8 and spring wire undersurface layer 12 constitutes, elastomeric layer 8 can be macromolecular material body, spring; This elastomeric layer 8 is having external force as the time spent bigger distortion to be arranged; So when spring type member 25 end positions changed, the relative position on first time distortion tooth 4-1 and first between the distortion tooth 4-2 had bigger variation, thereby improves the accuracy of testing.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
Embodiment 3
As shown in Figure 4; In the present embodiment; Different with embodiment 1 is: in spring type member 25, with first signal optical fibre 6 secondary signal optical fiber 9 is arranged side by side; And distortion tooth 4-4 on a plurality of second time distortion tooth 4-3 of second group of upper and lower surfaces that is laid in said spring wire 4 continuously and second group a plurality of second; Secondary signal optical fiber 9 is clamped on second time distortion tooth 4-3 and second between the distortion tooth 4-4, and distortion tooth 4-4 is one-period along spring type member 25 per 360 degree on said second time distortion tooth 4-3 and second, and the starting point in each cycle is positioned at the same direction of spring type member 25; And as zero degree; The bending curvature that the spacing of the distortion tooth in each cycle, tooth depth or distortion toe joint touch the head portion of signal optical fibre 9 is a monotone variation, and the bending curvature of the spacing of the distortion tooth of different cycles, tooth depth or distortion tooth tip is that monotone variation and trend are consistent, i.e. monotone variation or all be dull increasing or dull the minimizing; The Transmission Fibers 1 of passing through of secondary signal optical fiber 9 connects test cell 5, connects processing unit 7 behind the test cell 5.Like this when first signal optical fibre 6 detects the bending curvature of object under test 10; Processing unit 7 is according to prior demarcation; Be the corresponding different bending direction of different attenuation losss of secondary signal optical fiber 9, then draw the bending direction of object under test 10 through the loss value of secondary signal optical fiber 9.
Based on the assay method of the spring type bending parameter of bending loss of optical fiber, different with embodiment 1 is: after step 3 is accomplished, carry out following steps in the present embodiment:
The demarcation of the scale factor of step 4, the light signal loss changing value that is included in the secondary signal optical fiber 9 in the spring type member 25 and spring type member 25 bending curvatures and bending direction:
The method of demarcating: utilize under the circular arc and temperature field of known bending curvature; The different angle of spring type member 25 conversion that will contain secondary signal optical fiber 9 accordings to the circular arc bending; And the loss changing value of secondary signal optical fiber 9 under record respective curved curvature, temperature parameter and the respective angles, utilize the method for resulting The data interpolation and linear fit to obtain angle θ and secondary signal optical fiber 9 loss changing values and the bending curvature of bending direction, the scale factor K of temperature parameter changing value
θ(C), its relation can be expressed as:
θ=K
θ(C) Δ α
θ+ ε
θFormula two
In the formula: θ representes the bending direction angle that timing signal is different, and C representes the timing signal bending curvature, Δ α
θBe the loss changing value of light signal under differently curved orientation angle of expression and the differently curved curvature, K
θ(C) be scale factor under the differently curved curvature that obtains, the temperature, ε
θBe the error amount that obtains;
The collection of the loss changing value of the light signal of step 5, secondary signal optical fiber 9 transmission: two ends be fixed on the object under test 10 the spring type member 25 that contains secondary signal optical fiber 9 along with the bending of object under test 10 and crooked; The loss value of secondary signal optical fiber 9 is also along with the variation of the bending curvature of object under test 10 and bending direction angle and change; Obtain the loss changing value of secondary signal optical fiber 9 through test cell 5, and this value is passed to processing unit 7;
Bending curvature, temperature parameter and the formula three that step 6, processing unit 7 utilize secondary signal optical fiber 9 loss changing values, first signal optical fibre 6 to confirm provides the bending direction angle of object under test 10.
Preferred way is, needs the account temperature factor, this moment in step 4, the K in the formula two
θ(C) should be K
θ(C, T), T is the temperature of timing signal, K
θ(C T) is scale factor under the differently curved curvature that obtains, the temperature, Δ α
θBe the loss changing value of light signal under the differently curved orientation angle of expression and differently curved curvature and the temperature, in step 2, temperature parameter be passed to processing unit through the temperature sensor that is connected with processing unit 7.
Make proving installation of the present invention not only can confirm the bending curvature of object under test 10, confirm the bending direction of object under test 10 simultaneously.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
As shown in Figure 5; In the present embodiment; Different with embodiment 3 is: when object under test 10 has more than one bending curvature to be measured, all be mounted with two ends at corresponding position and be fixed in the spring type member 25 that contains signal optical fibre 6 on the object under test 10, and first signal optical fibre 6 in the said spring type member 25 is cascaded; When the bending curvature variation to be measured of object under test 10 is the timesharing variation; Obtain the loss of each part signal optical fiber 6 respectively through testing tool, thereby can test out each crooked curvature respectively, these test cell 5 usefulness light sources and light power meter just can constitute.If when each sweep has secondary signal optical fiber 9 to reach the distortion tooth that changes by the cycle; Can confirm the direction that each part is crooked; Processing unit 7 is through confirming the bending curvature and the bending direction of the various piece that each spring type member 25 is initial and final; Can provide the end-state of this object under test 10, and display unit 20 outputs through being connected with processing unit.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 3.
In the present embodiment; Different with embodiment 4 is: test cell 5 adopts optical time domain reflection technologies (OTDR) or coincidence frequency modulated continuous wave technology (FMCW) testing tool to obtain the loss of a plurality of moment, each part first signal optical fibre 6 respectively; Thereby can test out the crooked curvature in each position and the variation of curvature respectively; If when each sweep has secondary signal optical fiber 9 to reach the distortion tooth that changes by the cycle, can confirm the direction of each position bending and the variation of direction.Processing unit 7 can provide the end-state of this object under test 10 through confirming the bending curvature and the bending direction of the various piece that each spring type member 25 is initial and final, and exports through display unit 20.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 4.
As shown in Figure 6; In the present embodiment; Different with embodiment 4 is: each spring type member 25 is connected with test cell 5 through photoswitch 30; Test cell 5 obtains the loss of a plurality of moment, each part signal optical fiber 6 respectively through the gating function of photoswitch 30, thereby can test out the crooked curvature in each position and the variation of curvature respectively; If when each sweep has secondary signal optical fiber 9 to reach the distortion tooth that changes by the cycle, can confirm the direction of each position bending and the variation of direction.Processing unit 7 can provide the end-state of this object under test 10 through confirming the bending curvature and the bending direction of the various piece that each spring type member 25 is initial and final, and exports through display unit 20.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 4.
What present embodiment and embodiment 3 were different is: intersect between each cycle; And each cycle is divided into limited the zone of equal number, be identical corresponding to the spacing or the tooth depth of the distortion tooth in the corresponding region on each cycle of spring type member 25 same directions.When we only need to confirm roughly bending direction of object under test 10; Can be as required as only confirming 4,6 or 8 directions; Each cycle is divided into 4,6 or 8 zones; The spacing or the tooth depth of the distortion tooth in each zone are identical; But the tooth pitch of the distortion tooth in any two zones or tooth depth are different in each cycle, the curvature that processing unit 5 is confirmed according to first signal optical fibre 6 and the loss changing value of secondary signal optical fiber 9, and prior nominal data is determined the bending direction of object under test 10.
The above; It only is preferred embodiment of the present invention; Be not that the present invention is done any restriction, every technical spirit all still belongs in the protection domain of technical scheme of the present invention any simple modification, change and equivalent structure transformation that above embodiment did according to the present invention.
Claims (9)
1. based on the determinator of the spring type bending parameter of bending loss of optical fiber; It is characterized in that: comprise that two ends are fixed on the object under test (10) one whole spiral many wound springs type member (25) that is made up of spring wire (4); Upper surface and lower surface upper edge spring wire (4) at spring wire (4) vertically are laid with a plurality of distortion teeth continuously; Being out of shape tooth (4-2) on on the lower surface of the upper spring silk in the two adjacent rings spring wire (4) first time distortion tooth (4-1) and the lower spring silk upper surface first interlocks corresponding; Between first time distortion tooth (4-1) and the tooth pitch that is out of shape between the tooth (4-2) on first be uniform; Be out of shape on said first time distortion tooth (4-1) and first and accompany first signal optical fibre (6) between the tooth (4-2); Said first signal optical fibre (6) is connected with test cell (5) through Transmission Fibers (1), and said test cell (5) is connected with processing unit (7).
2. the determinator of the spring type bending parameter based on bending loss of optical fiber according to claim 1 is characterized in that: be provided with elastomeric layer (8) between the upper surface of the spring wire (4) of described formation spring type member (25) and the lower surface.
3. the determinator of the spring type bending parameter based on bending loss of optical fiber according to claim 1; It is characterized in that: be included in the secondary signal optical fiber of laying side by side with first signal optical fibre (6) on spring wire (4) surface (9); And be laid in continuously on second on second time distortion tooth (4-3) and the second group of a plurality of lower spring silk upper surface on the lower surface of second group of a plurality of upper spring silk of said spring wire (4) and be out of shape tooth (4-4); Said secondary signal optical fiber (9) is clamped in second time distortion and is out of shape between the tooth (4-4) on the tooth (4-3) and second; Be out of shape tooth (4-4) on said second time distortion tooth (4-3) and second and be one-period along per 360 degree of spring type member (25); The starting point in each cycle is positioned at the same direction of spring type member (25); And as zero degree; The spacing or the tooth depth of the distortion tooth in each cycle are monotone variation, and the spacing of the distortion tooth of different cycles or tooth depth be that monotone variation and variation tendency are consistent, and said second signal optical fibre (9) is connected with test cell (5) through Transmission Fibers (1).
4. the determinator of the spring type bending parameter based on bending loss of optical fiber according to claim 3; It is characterized in that: do not intersect between each cycle; Each cycle is divided into limited the zone of equal number, is identical corresponding to the spacing or the tooth depth of the distortion tooth in the corresponding region on each cycle of the same direction of spring type member (25).
5. the determinator of the spring type bending parameter based on bending loss of optical fiber according to claim 2 is characterized in that: said spring type member is connected with test cell (5) through photoswitch (30).
6. based on the assay method of the spring type bending parameter of bending loss of optical fiber, it is characterized in that, may further comprise the steps:
The demarcation of the scale factor of step 1, the light signal loss changing value that is included in first signal optical fibre (6) in the spring type member (25) and spring type member (25) bending curvature:
The method of demarcating: the length that will contain the spring type member (25) of first signal optical fibre (6) locks under original state or linear state; Utilize the circular arc of known bending curvature; The spring type member (25) that will contain first signal optical fibre (6) is crooked according to circular arc; And be recorded in the loss changing value of first signal optical fibre (6) under the respective curved curvature; Utilize the method for resulting The data interpolation and linear fit to obtain the scale factor K of bending curvature and signal optical fibre loss changing value, its relation can be expressed as:
C
I=K Δ α
I+ ε formula one
In the formula: C
IThe different bending curvature value of expression timing signal, Δ α
IBe the loss changing value of light signal under the differently curved curvature of expression, K is the scale factor that obtains, and ε is the error amount that obtains;
The collection of the loss changing value of the light signal of step 2, first signal optical fibre (6) transmission: spring type member (25) bending along with the bending of object under test (10) that contains first signal optical fibre (6) on the object under test (10) is fixed at two ends; The loss value of first signal optical fibre (6) also changes thereupon; Obtain the loss changing value of first signal optical fibre (6) through test cell (5); And this value passed to processing unit (7); Wherein, spring type member (25) its length when original state or linear state of being fixed on the object under test (10) of two ends is consistent with the length of timing signal;
Step 3, processing unit (7) utilize first signal optical fibre (6) loss changing value and formula one to provide the bending curvature of object under test (10).
7. the assay method of the spring type bending parameter based on bending loss of optical fiber according to claim 6 is characterized in that, after step 3 is accomplished, carries out following steps:
The demarcation of the scale factor of step 4, the light signal loss changing value that is included in the secondary signal optical fiber (9) in the spring type member (25) and spring type member (25) bending curvature and bending direction:
The method of demarcating: the circular arc that utilizes known bending curvature; The different angle of spring type member (25) conversion that will contain secondary signal optical fiber (9) accordings to the circular arc bending; And the loss changing value of secondary signal optical fiber (9) under record respective curved curvature and the respective angles, utilize the method for resulting The data interpolation and linear fit to obtain the scale factor K of angle θ and secondary signal optical fiber (9) the loss changing value and the bending curvature changing value of bending direction
θ(C), its relation can be expressed as:
θ=K
θ(C) Δ α
θ+ ε
θFormula two
In the formula: θ representes the bending direction angle that timing signal is different, and C representes the timing signal bending curvature, Δ α
θBe the loss changing value of light signal under differently curved orientation angle of expression and the differently curved curvature, K
θ(C) be scale factor under the differently curved curvature that obtains, ε
θBe the error amount that obtains;
The collection of the loss changing value of the light signal of step 5, secondary signal optical fiber (9) transmission: spring type member (25) bending along with the bending of object under test (10) that contains secondary signal optical fiber (9) on the object under test (10) is fixed at two ends; The loss value of secondary signal optical fiber (9) is also along with the variation of the bending curvature of object under test (10) and bending direction angle and change; Obtain the loss changing value of secondary signal optical fiber (9) through test cell (5), and this value is passed to processing unit (7);
The bending direction angle that step 6, processing unit (7) utilize bending curvature that secondary signal optical fiber (9) loss changing value, first signal optical fibre (6) confirm and formula two to provide object under test (10).
8. the assay method of the spring type bending parameter based on bending loss of optical fiber according to claim 6; It is characterized in that: when object under test (10) has more than one bending curvature to be measured; All be mounted with two ends at corresponding position and be fixed in the spring type member (25) that contains signal optical fibre on the object under test (10), and first signal optical fibre (6) in the said spring type member (25) is cascaded.
9. the assay method of the spring type bending parameter based on bending loss of optical fiber according to claim 7; It is characterized in that: when object under test (10) is when being made up of a plurality of flexible parts; Processing unit (7) can provide the end-state of this object under test (10) through confirming the bending curvature and the bending direction of its initial and final various piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010532007XA CN102466469A (en) | 2010-11-04 | 2010-11-04 | Measuring device of spring type bending parameter based on fiber bending loss and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010532007XA CN102466469A (en) | 2010-11-04 | 2010-11-04 | Measuring device of spring type bending parameter based on fiber bending loss and method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102466469A true CN102466469A (en) | 2012-05-23 |
Family
ID=46070392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010532007XA Pending CN102466469A (en) | 2010-11-04 | 2010-11-04 | Measuring device of spring type bending parameter based on fiber bending loss and method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102466469A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113742852A (en) * | 2020-05-27 | 2021-12-03 | 上海沃尔沃汽车研发有限公司 | Modeling design method of spiral spring |
| CN118209056A (en) * | 2024-05-20 | 2024-06-18 | 浙江大学 | Optical waveguide bending sensor, fish-shaped robot and claw-shaped robot |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08285552A (en) * | 1995-04-13 | 1996-11-01 | Mitsubishi Heavy Ind Ltd | Method and apparatus for measuring direction of curvature |
| JP2005181210A (en) * | 2003-12-22 | 2005-07-07 | Fujikura Ltd | Optical fiber displacement sensor and collision detection sensor using same |
| CN1664495A (en) * | 2005-03-17 | 2005-09-07 | 上海交通大学 | Bending sensor capable of simultaneously measuring bending curvature and bending direction |
| JP2007024527A (en) * | 2005-07-12 | 2007-02-01 | Fiberlabs Inc | Optical fiber sensor and sensor system |
| CN101776515A (en) * | 2009-12-25 | 2010-07-14 | 西安金和光学科技有限公司 | Curved high-sensitivity detection device for bending loss of optical fiber |
| CN101840027A (en) * | 2010-05-04 | 2010-09-22 | 西安金和光学科技有限公司 | Spring-type all-fiber precise adjustable optical attenuator |
| CN101865665A (en) * | 2010-04-06 | 2010-10-20 | 西安金和光学科技有限公司 | Measurement device and method of optical fiber bending parameter |
| CN201903331U (en) * | 2010-11-04 | 2011-07-20 | 西安金和光学科技有限公司 | Measuring device for spring type bending parameters based on optical fiber bending loss |
-
2010
- 2010-11-04 CN CN201010532007XA patent/CN102466469A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08285552A (en) * | 1995-04-13 | 1996-11-01 | Mitsubishi Heavy Ind Ltd | Method and apparatus for measuring direction of curvature |
| JP2005181210A (en) * | 2003-12-22 | 2005-07-07 | Fujikura Ltd | Optical fiber displacement sensor and collision detection sensor using same |
| CN1664495A (en) * | 2005-03-17 | 2005-09-07 | 上海交通大学 | Bending sensor capable of simultaneously measuring bending curvature and bending direction |
| JP2007024527A (en) * | 2005-07-12 | 2007-02-01 | Fiberlabs Inc | Optical fiber sensor and sensor system |
| CN101776515A (en) * | 2009-12-25 | 2010-07-14 | 西安金和光学科技有限公司 | Curved high-sensitivity detection device for bending loss of optical fiber |
| CN101865665A (en) * | 2010-04-06 | 2010-10-20 | 西安金和光学科技有限公司 | Measurement device and method of optical fiber bending parameter |
| CN101840027A (en) * | 2010-05-04 | 2010-09-22 | 西安金和光学科技有限公司 | Spring-type all-fiber precise adjustable optical attenuator |
| CN201903331U (en) * | 2010-11-04 | 2011-07-20 | 西安金和光学科技有限公司 | Measuring device for spring type bending parameters based on optical fiber bending loss |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113742852A (en) * | 2020-05-27 | 2021-12-03 | 上海沃尔沃汽车研发有限公司 | Modeling design method of spiral spring |
| CN113742852B (en) * | 2020-05-27 | 2023-06-16 | 上海沃尔沃汽车研发有限公司 | Modeling design method of spiral spring |
| CN118209056A (en) * | 2024-05-20 | 2024-06-18 | 浙江大学 | Optical waveguide bending sensor, fish-shaped robot and claw-shaped robot |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101865665A (en) | Measurement device and method of optical fiber bending parameter | |
| JP5562435B2 (en) | Optical fiber sensor based on spiral configuration | |
| CN103398801B (en) | A kind of optical fiber grating temperature measurement mechanism and measuring method | |
| CN102466468A (en) | Device and method for measuring cylinder bending parameters based on optical fiber bending loss | |
| CN108317965A (en) | A kind of measurement deformation structure and method with fiber grating | |
| CN204495287U (en) | A kind of position transducer based on fiber array and reflective digital scrambler | |
| CN102466469A (en) | Measuring device of spring type bending parameter based on fiber bending loss and method thereof | |
| CN103822646B (en) | The demodulation method of optical fiber grating regulating system middle and long distance light delay effect | |
| CN201903331U (en) | Measuring device for spring type bending parameters based on optical fiber bending loss | |
| CN102466470A (en) | Device and method for measuring corrugated pipe type bending parameters based on optical fiber bending loss | |
| CN110596837A (en) | Temperature-sensing optical fiber cable free of stress packaging and preparation method thereof | |
| CN102374872A (en) | Optical fiber sensing device based on functional material | |
| CN102221374A (en) | Fiber sensing device for sensing torque parameters | |
| CN201772967U (en) | Fiber stress sensing device based on corrugated pipe | |
| CN2664005Y (en) | Reseau type optical fiber microbend sensor | |
| CN209181734U (en) | Applied on strain gauge substrate and corresponding strain gauge | |
| CN210572930U (en) | Temperature-sensing optical fiber cable free of stress packaging | |
| JPS60244908A (en) | Cutless signal detector for optical fiber | |
| CN105258641A (en) | Position sensor based on fiber array and reflection type digital encoder | |
| CN201772993U (en) | Multilayer type high-precision fiber detector based on microbending loss | |
| CN201858981U (en) | Spring type fiber sensor for eliminating and reducing influence of temperature | |
| CN201903356U (en) | Optical fiber type rotation parameter testing device | |
| CN117606392B (en) | Fiber sensing method and sensing system for straightness of scraper conveyor | |
| CN109931875A (en) | A kind of buried type geotechnical engineering monitoring device | |
| CN212391601U (en) | Magnetic field induction measuring system based on optical fiber coding |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120523 |