CN101865665A - Measurement device and method of optical fiber bending parameter - Google Patents
Measurement device and method of optical fiber bending parameter Download PDFInfo
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- CN101865665A CN101865665A CN201010219537A CN201010219537A CN101865665A CN 101865665 A CN101865665 A CN 101865665A CN 201010219537 A CN201010219537 A CN 201010219537A CN 201010219537 A CN201010219537 A CN 201010219537A CN 101865665 A CN101865665 A CN 101865665A
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Abstract
The invention discloses a measurement device and method of optical fiber bending parameter and the device and method are separately a new structure and a method based on the change of fiber microbending loss, thus the bending curvature and change of a object to be measured can be measured accurately in wide range, the bending direction/angle and the change thereof can be measured at the same time, and the measurement device and method of bending parameter of the invention can have wide operating range. As the measurement of the device and method is based on the loss of optical fiber and the loss testing is the most mature, most stable and cheapest technology of fiber testing, the application costs of the device and method enjoy the considerable advantage. The time division technology, the optical time domain reflection technology (OTDR) and the coincidence frequency modulated continuous wave technology (FMCW) can be utilized to realize quasi-distributed or distributed measurement, thus providing wide application prospect for the further development of the device and method of the invention.
Description
Technical field
The present invention relates to a kind of measurement mechanism and method of technical field of optical fiber sensing, specifically is optical-fiber type determinator and the method for measuring bending curvature and bending direction.
Background technology
Along with bionical thing machine, intelligent robot, the development of intelligence machines such as virtual hand, monitoring for the motion of the limbs joint of such machine is absolutely necessary, wherein bending curvature and bending direction are very crucial parameters, present measuring method has electric method, optical method and traditional optical Fiber Method, the above two structural principle complexity, the cost height, error is bigger, and need complicated circuit, software systems are supported, relatively difficulty is promoted in practical application, and traditional optical Fiber Method relatively is typically the fiber grating method, as Chinese patent application numbers 200510024425.7,200710043767.2 and 200780039102.2 patent all is to adopt this method, though have greatly improved than the above two, but its shortcoming is quite a few,, need to use expensive fiber grating demodulation equipment still than higher as cost, cost significantly increases when particularly needing to carry out multimetering; Simultaneously fiber grating is a kind ofly in use need increase extra step and eliminate Temperature Influence 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 these class methods.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of determinator and method of bending parameter of optical-fiber type, this apparatus structure is simple, reasonable in design, method of operating is convenient and use-pattern is flexible, temperature sensitivity is low, highly sensitive, 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; 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 can utilize time division technique, 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.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of determinator of optical fiber bending parameter, it is characterized in that: a shaped form housing and a plurality of A side distortion teeth and a plurality of B side distortion tooth that vertically are laid in the relative both sides of described shaped form enclosure interior along the shaped form housing continuously, the two ends of shaped form housing are fixed on the object under test, being laid in the A side distortion tooth of shaped form enclosure interior and the relative position between the B side distortion tooth changes along with the variation of object under test bending curvature, described A side distortion tooth and B side distortion tooth are staggered and lay, and the distortion between cog at the two accompanies light-conductive optic fibre, the tooth pitch that a plurality of A sides of the relative both sides of described shaped form enclosure interior are out of shape between the teeth and a plurality of B side is out of shape between the tooth is uniform, A side distortion tooth and B side distortion tooth correspondence are laid in the light-conductive optic fibre both sides, the extension optical fiber of light-conductive optic fibre is connected with test cell, and the test cell back connects processing unit.
When the bending curvature of object under test changes, just there is the subregion to be in compressive state on the shaped form housing, the subregion is in extended state, compressive state zone or extended state zone make respectively along the distance between a plurality of A sides distortion teeth of shaped form housing distribution and a plurality of B side distortion tooth and reduce to obtain increase, thereby just can change the bending radius of the light-conductive optic fibre that accompanies at A side distortion tooth and B side distortion between cog, also promptly change the bending loss coefficient of light-conductive optic fibre, thereby on test cell, detect the variation of input optical signal and this variable signal is sent into processing unit.
The scheme that apparatus of the present invention solve further technical matters is: the tooth depth of a plurality of A side distortion teeth of the relative both sides of described shaped form enclosure interior and a plurality of B side distortion tooth is identical.
The scheme that apparatus of the present invention solve further technical matters is: described shaped form housing is spiral fashion, Z word shape or plane wind spring shape.
The scheme that apparatus of the present invention solve further technical matters is: the A side of described shaped form housing is to be connected by resilient material with the B side, constitute as materials such as macromolecular material, springs, these materials are having external force as the time spent bigger distortion to be arranged, so when shaped form housing end positions changed, the relative position between the distortion tooth on A side and the B side had bigger variation.
The scheme that apparatus of the present invention solve further technical matters is: the A of described plane wind spring shape shaped form housing, the B side is two-layer up and down, the inner of plane wind spring shape shaped form housing changes with respect to outer end position, as protruding or when recessed, A side distortion tooth of laying continuously along the inside of described plane wind spring shape shaped form housing (being upside distortion tooth) and the variable in distance between B side distortion tooth (being downside distortion tooth), the bending radius of the light-conductive optic fibre that is clamped in A side distortion tooth and B side distortion between cog is changed, also promptly change the bending loss coefficient of light-conductive optic fibre, thereby detect the variation of input optical signal on test cell, the test cell back connects processing unit.Through prior demarcation, the bending curvature that different attenuation losss is corresponding different, thus just can obtain the bending curvature of object under test.When object under test is a spherome surface, can obtain the bending curvature of this spheroid.
The scheme that apparatus of the present invention solve further technical matters is: with first light-conductive optic fibre second light-conductive optic fibre arranged side by side in the shaped form housing, and second group of a plurality of A side distortion tooth and second group of a plurality of B side distortion tooth of being laid in the relative both sides of described shaped form enclosure interior continuously, second group of a plurality of A side distortion tooth and second group of a plurality of B side distortion between cog accompany second light-conductive optic fibre, described second group of a plurality of A side distortion tooth and second group of a plurality of B side distortion tooth are one-period along per 360 degree of shaped form housing, the starting point in each cycle is positioned at the same direction of shaped form housing, and as 0 angle, 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 trend is consistent, be monotone variation or all be dull increasing or dull the minimizing that the extension fibre of second light-conductive optic fibre connects test cell.
The scheme that apparatus of the present invention solve further technical matters is: vertically this shaped form housing is divided into two parts along the shaped form housing in the shaped form housing, each part all has A, the B both sides, and accompany first light-conductive optic fibre and second light-conductive optic fibre respectively at the A of each part side distortion tooth and B side distortion between cog respectively, a plurality of A side distortion teeth of clamping second light-conductive optic fibre and a plurality of B side distortion tooth are one-period along per 360 degree of shaped form housing, the starting point in each cycle is positioned at the same direction of shaped form housing, and as 0 angle, 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 trend is consistent, be monotone variation or all be dull increasing or dull the minimizing that the extension fibre of second light-conductive optic fibre connects testing tool.Like this when first light-conductive optic fibre detects the bending curvature of object under test, according to prior demarcation, the corresponding different bending direction of attenuation loss that second light-conductive optic fibre is different can draw the bending direction of object under test by the loss value of second light-conductive optic fibre.
The scheme that apparatus of the present invention solve further technical matters is: second light-conductive optic fibre is arranged in the shaped form housing, and second group of a plurality of A side distortion tooth and second group of a plurality of B side distortion tooth of being laid in the relative both sides of described shaped form enclosure interior continuously, second group of a plurality of A side distortion tooth and second group of a plurality of B side distortion between cog accompany second light-conductive optic fibre, described second group of a plurality of A side distortion tooth and second group of a plurality of B side distortion tooth are one-period along per 360 degree of shaped form housing, do not intersect between each cycle, and be divided into limited the zone of equal number each cycle, spacing or tooth depth corresponding to the distortion tooth in the corresponding region on each cycle of the same direction of shaped form housing are identical, and the extension fibre of second light-conductive optic fibre connects test cell.When we only need to determine roughly bending direction of object under test, can be as required as only determining 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 or the tooth depth difference of the distortion tooth in any two zones in each cycle, the curvature that processing unit is determined according to first light-conductive optic fibre and the loss changing value of second light-conductive optic fibre, and prior nominal data is determined the bending direction of object under test.
The scheme that apparatus of the present invention solve further technical matters is: 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 shaped form housing that contains light-conductive optic fibre on the object under test, and the light-conductive optic fibre in the described shaped form housing is cascaded.
The scheme that apparatus of the present invention solve further technical matters is: when object under test has more than one bending curvature to be measured and bending to be the timesharing variation, obtain the loss of each part light-conductive optic fibre respectively by test cell, thereby can test out each crooked curvature respectively, if when each sweep has second light-conductive optic fibre to reach the distortion tooth that changes by the cycle, can determine the direction of each part bending, this test cell just can constitute with light source and light power meter.
The scheme that apparatus of the present invention solve further technical matters is: when object under test has more than one bending curvature to be measured position and can not determine that bending is the timesharing variation, obtain a plurality of moment respectively by optical time domain reflection technology (OTDR) or coincidence frequency modulated continuous wave technology (FMCW) test cell, the loss of each part light-conductive optic fibre, thereby can test out the variation of the curvature and the curvature of each position bending respectively, if when each sweep has second light-conductive optic fibre to reach the distortion tooth that changes by the cycle, can determine the variation of the direction and the direction of each position bending.
The scheme that apparatus of the present invention solve further technical matters is: when object under test is when being made of a plurality of flexible parts, processing unit can provide the end-state of this object under test by determining the bending curvature and the bending direction of its initial and final various piece.
The scheme that apparatus of the present invention solve further technical matters is: can the light-conductive optic fibre in a plurality of shaped form housings on object under test be connected respectively by optical branching device.
The scheme method that the inventive method solves further technical matters is that it is as follows that it detects step:
1. be included in the demarcation of the scale factor of the light signal loss changing value of the light-conductive optic fibre in the shaped form housing and shaped form buckling of shells curvature:
The method of demarcating: the length that will contain the shaped form housing of light-conductive optic fibre locks under original state or linear state, utilize the circular arc of known bending curvature, the shaped form housing that will contain light-conductive optic fibre is according to the circular arc bending, and be recorded in the loss changing value of light-conductive optic fibre 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 C and light-conductive optic fibre loss changing value, its relation can be expressed as:
C
I＝K*Δα
I+ε????????????????(1)
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;
2. the collection of the loss changing value of the light signal of light-conductive optic fibre transmission: the shaped form housing that contains light-conductive optic 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 light-conductive optic fibre also changes thereupon, obtain the loss changing value of light-conductive optic fibre by test cell, and this value passed to processing unit, wherein, shaped form housing 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;
3. processing unit utilizes light-conductive optic fibre loss changing value and formula (1) to provide the bending curvature of object under test.
The scheme method that the inventive method solves further technical matters is: the length that timing signal will contain the shaped form housing of light-conductive optic fibre locks under original state or linear state, be to be fixed in the two ends of shaped form housing flexible but on the rhabodoid that length variations is ignored, rhabodoid can be metal bar, metal tube or macromolecular material rod.
The scheme method that the inventive method solves further technical matters is that it is as follows that it detects step:
According to aforesaid detection method 1. to 3. step, can obtain the bending curvature of object under test, following detection step is to obtain the bending direction of object under test:
4. be included in the demarcation of the scale factor of the light signal loss changing value of second light-conductive optic fibre in the shaped form housing and shaped form buckling of shells curvature and bending direction:
The method of demarcating: the circular arc that utilizes known bending curvature, to contain the different angle of the shaped form housing conversion of second light-conductive optic fibre according to the circular arc bending, and the loss changing value of second light-conductive optic fibre 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 second light-conductive optic 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)*Δα
θ+ε
θ????????????(2)
In the formula: θ represents the bending direction angle that timing signal is different, and C represents 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;
5. the collection of the loss changing value of the light signal of second light-conductive optic fibre transmission: two ends be fixed on the object under test the shaped form housing that contains second light-conductive optic fibre along with the bending of object under test and crooked, the loss value of second light-conductive optic fibre 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 second light-conductive optic fibre by test cell, and this value is passed to processing unit;
6. processing unit utilizes the bending direction angle that bending curvature that the second light-conductive optic fibre loss changing value, first light-conductive optic fibre determine and formula (2) provide object under test.
Make shaped form housing and distortion tooth by selecting more low-expansion material, can reduce the influence of temperature significantly to the measuring accuracy of apparatus of the present invention, when needs further improve measuring accuracy, can finish by prior demarcation, promptly determine K and K by the method for interpolation and linear fit after the match at different uniform temperatures
θ(C), in actual use, by temperature sensor to the test of environment temperature and be transferred to processing unit and come test result is revised.
In sum, the present invention with respect to the advantage of prior art be simple in structure, reasonable in design, processing and fabricating convenient and use-pattern is flexible, highly sensitive, result of use is good, with respect to prior art, the invention provides a kind of determinator and method of optical fiber bending parameter, 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; 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 can utilize time division technique, 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.
Below by drawings and Examples, the technical scheme of inventing is described in further detail.
Description of drawings
Fig. 1 is the structural representation of the present invention's first embodiment.
Fig. 2 is the schematic cross-section of shaped form housing among Fig. 1.
Fig. 3 is the structural representation of the present invention's second embodiment.
Fig. 4 is the schematic cross-section of shaped form housing among Fig. 3.
Fig. 5 is the plan structure synoptic diagram of the present invention's the 3rd embodiment.
Fig. 6 is the side-looking structural representation of the present invention's the 3rd embodiment.
Fig. 7 is the schematic cross-section of the shaped form housing of the present invention's the 4th embodiment.
Fig. 8 is the schematic cross-section of the shaped form housing of the present invention's the 5th embodiment.
Fig. 9 is the schematic cross-section of two fine shaped form housings.
Figure 10 is the schematic cross-section of double-deck shaped form housing.
Figure 11 is the structural representation of the present invention's the 6th embodiment.
Figure 12 is the structural representation of the present invention's the 7th embodiment.
Figure 13 is the structural representation of the present invention's the 8th embodiment.
Description of reference numerals:
| The 1-Transmission Fibers; | 4-shaped form housing; | The 5-test cell; |
| The 6-light-conductive optic fibre; | The 7-processing unit; | The 8-elastic materials; |
| The 10-object under test; | The 20-display unit; | The 21-outer end; |
| 22-the inner; | The 30-photoswitch; | 4-1-A side distortion tooth; |
| 4-2-B side distortion tooth; | Second group of A side distortion of 4-3-tooth; | Second group of B side distortion of 4-4-tooth; |
| 6-1-first light-conductive optic fibre; | 6-2-second light-conductive optic fibre; | The 40-temperature sensor; |
Embodiment
As Fig. 1, shown in Figure 2, the a plurality of A side distortion tooth 4-1 and a plurality of B side distortion tooth 4-2 that the present invention includes a shaped form housing 4 and vertically be laid in described shaped form housing 4 inner both sides relatively along the shaped form housing continuously, the two ends of shaped form housing 4 are fixed on the crooked position of object under test 10, being laid in the A side distortion tooth 4-1 of shaped form housing 4 inside and the relative position between the B side distortion tooth 4-2 changes along with the variation of object under test 10 bending curvatures, described A side distortion tooth 4-1 and B side distortion tooth 4-2 are staggered and lay, and the distortion between cog at the two accompanies light-conductive optic fibre 6, a plurality of A side distortion tooth 4-1 of described shaped form housing 4 inner both sides relatively and the tooth pitch between a plurality of B side distortion tooth 4-2 are uniform, A side distortion tooth 4-1 and B side distortion tooth 4-2 correspondence are laid in light-conductive optic fibre 6 both sides, light-conductive optic fibre 6 is connected with test cell 5 by Transmission Fibers 1, test cell 5 back are connected to processing unit 7, and temperature sensor 40 is connected to processing unit 7.
In the present embodiment, described shaped form housing 4 integral body shape and two ends in the shape of a spiral are fixed on the object under test 10, and the zone to be measured of object under test 10 is enclosed in the shaped form housing 4, when the bending curvature of object under test 10 changes, the position at shaped form housing 4 two ends also changes, also just changed simultaneously along a plurality of A sides distortion tooth 4-1 of shaped form housing 4 distributions and the distance between a plurality of B side distortion tooth 4-2, thereby just can change the bending radius of the light-conductive optic fibre 6 that between A side distortion tooth 4-1 and B side distortion tooth 4-2, accompanies, also promptly change the bending loss coefficient of light-conductive optic fibre 6, preferred way is to be under the state of straight line in original state or shaped form housing 4 integral body, make the bending curvature of light-conductive optic fibre 6 very little, its bending loss value can be ignored, integral body presents spiral helicine shaped form housing 4 when bending like this, the loss of the light-conductive optic fibre 6 that loosens the zone of part shaped form housing 4 can not change and need not consider, and the decay that occur light signal owing to the bending curvature that changes light-conductive optic fibre 6 is just understood in the zone that compresses of shaped form housing 4, variation along with the curvature of object under test 10, the loss of the light signal of transmission also changes in the light-conductive optic fibre 6, thereby on test cell 5, detect the variation of light signal and pass the signal along to processing unit 7, 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.
Above-mentioned detection and demarcation concrete steps are as follows:
1. be included in the demarcation of the scale factor of the light signal loss changing value of the light-conductive optic fibre 6 in the shaped form housing 4 and shaped form buckling of shells curvature and temperature parameter:
The method of demarcating: the length that will contain the shaped form housing 4 of light-conductive optic fibre 6 locks under original state or linear state, locking means is to be fixed in the two ends of shaped form housing 6 flexible but on the rhabodoid that length variations is ignored, rhabodoid can be metal bar, metal tube or macromolecular material rod.Utilize the circular arc of known bending curvature and known uniform temperature after the match, the shaped form housing 4 that will contain light-conductive optic fibre 6 is according to the circular arc bending, and be recorded in the loss changing value of light-conductive optic 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 C and light-conductive optic fibre loss changing value, its relation can be expressed as:
C
I＝K*Δα
I+ε????????????(3)
In the formula: C
IThe different bending curvature value of expression timing signal, Δ α
IBe the loss changing value of light signal under differently curved curvature of expression and the temperature, K is the scale factor that obtains, and ε is the error amount that obtains;
2. the collection of the loss changing value of the light signal of light-conductive optic fibre 6 transmission: shaped form housing 4 bending along with the bending of object under test 10 that contains light-conductive optic fibre 6 on the object under test 10 is fixed at two ends, the loss value of light-conductive optic fibre 6 also changes thereupon, obtain the loss changing value of light-conductive optic fibre 6 by test cell 5, and this value passed to processing unit 7, temperature sensor 40 is passed to processing unit 7 with temperature parameter;
3. processing unit 7 utilizes light-conductive optic fibre 6 loss changing values, temperature parameter and formula (3) to provide the bending curvature of object under test 10.
Described light-conductive optic fibre 6 is for the outside optical fiber that is surrounded by the multilayer fibers protective seam, as tight tube fiber, carbon coated fiber, polyimide coated optical fiber etc.; Described light-conductive optic fibre 6 also can be plastic optical fiber or photonic crystal fiber.
Embodiment 2
As shown in Figure 3, Figure 4, in the present embodiment, as different from Example 1: described shaped form housing 4 integral body are Z word shape, the two ends of this shaped form housing 4 are fixed on the object under test 10 and are positioned at the outside of object under test 10, the cross sectional shape of described shaped form housing 4 is circular, can be other multiple shapes such as oval ring-type with the cross section processing and fabricating of described shaped form housing 4 also during actual processing and fabricating.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
Embodiment 3
As Fig. 5, shown in Figure 6, in the present embodiment, as different from Example 1: described shaped form housing 4 integral body are plane wind spring shape, the outer end 21 of shaped form housing 4 and inner 22 is individually fixed on the sphere of object under test 10, when the spherical curve curved transition of object under test 10, the position at shaped form housing 4 two ends also changes, also just changed simultaneously along a plurality of A sides distortion tooth 4-1 of shaped form housing 4 distributions and the distance between a plurality of B side distortion tooth 4-2, thereby just can change the bending radius of the light-conductive optic fibre 6 that between A side distortion tooth 4-1 and B side distortion tooth 4-2, accompanies, also promptly change the bending loss coefficient of light-conductive optic fibre 6, thereby on test cell 5, detect the variation of light signal and be delivered to processing unit 7, processing unit 7 is according to prior demarcation, the spherical curve curvature that different attenuation loss is corresponding different, thus the spherical curve curvature of object under test 10 just can be obtained.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
As shown in Figure 7, in the present embodiment, as different from Example 1: the A side of described shaped form housing 4 is to be connected by elastic materials 8 with the B side, elastic materials 8 can be macromolecular material body, spring, this elastic materials 8 is having external force as the time spent bigger distortion to be arranged, so when shaped form housing 4 end positions changed, the relative position between the distortion tooth 4-1 of A side and the distortion tooth 4-2 on the B side had bigger variation, thereby improve the accuracy of test.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
As shown in Figure 8, in the present embodiment, as different from Example 4: the A side of described shaped form housing 4 is to be connected by two elastic materials 8 with the B side, improve the stable and bigger deformation of adaptation of shaped form housing 4 and be unlikely to make shaped form housing 4 to damage, in the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 4.
As shown in Figure 9, in the present embodiment, as different from Example 1: in shaped form housing 4, second light-conductive optic fibre 6-2 arranged side by side with first light-conductive optic fibre 6-1, and second group of a plurality of A side distortion tooth 4-3 and second group of a plurality of B side distortion tooth 4-4 of being laid in described shaped form housing 4 inner both sides relatively continuously, accompany the second light-conductive optic fibre 6-2 between second group of a plurality of A side distortion tooth 4-3 and second group of a plurality of B side distortion tooth 4-4, described second group of a plurality of A side distortion tooth 4-3 and second group of a plurality of B side distortion tooth 4-4 are one-period along shaped form housing 4 per 360 degree, the starting point in each cycle is positioned at the same direction of shaped form housing 4, and as 0 angle, 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 trend is consistent, be monotone variation or all be dull increasing or dull the minimizing, the extension fibre of second light-conductive optic fibre 6 connects test cell 5, connects processing unit 7 behind the test cell 5.Like this when the first light-conductive optic fibre 6-1 detects the bending curvature of object under test 10, processing unit 7 is according to prior demarcation, the bending direction that attenuation loss that promptly the second light-conductive optic fibre 6-2 is different is corresponding different then draws the bending direction of object under test 10 by the loss value of the second light-conductive optic fibre 6-2.
Detection and demarcating steps are as different from Example 1 in the present embodiment:
4. be included in the demarcation of the scale factor of the light signal loss changing value of the second light-conductive optic fibre 6-2 in the shaped form housing 4 and shaped form housing 4 bending curvatures and bending direction and temperature parameter:
The method of demarcating: utilize under the circular arc and temperature field of known bending curvature, to contain the different angle of shaped form housing 4 conversion of second light-conductive optic fibre according to the circular arc bending, and the loss changing value of the second light-conductive optic fibre 6-2 under record respective curved curvature, temperature parameter and the respective angles, utilize the method for resulting The data interpolation and linear fit to obtain the scale factor K of the angle θ of bending direction and the second light-conductive optic fibre 6-2 loss changing value and bending curvature, temperature parameter changing value
θ(C, T), its relation can be expressed as:
θ＝K
θ(C，T)*Δα
θ+ε
θ????????(4)
In the formula: θ represents the bending direction angle that timing signal is different, and C represents the timing signal bending curvature, and T demarcates the temperature that is, 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, K
θ(C T) is scale factor under the differently curved curvature that obtains, the temperature, ε
θBe the error amount that obtains;
5. the collection of the loss changing value of the light signal of second light-conductive optic fibre 6-2 transmission: two ends be fixed on the object under test 10 the shaped form housing 4 that contains the second light-conductive optic fibre 6-2 along with the bending of object under test 10 and crooked, the loss value of the second light-conductive optic fibre 6-2 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 the second light-conductive optic fibre 6-2 by test cell, and this value passed to processing unit, temperature sensor is passed to processing unit 7 with temperature parameter;
6. processing unit 7 utilizes the second light-conductive optic fibre 6-2 loss changing value, definite bending curvature, temperature parameter and the formula (4) of the first light-conductive optic fibre 6-1 to provide the bending direction angle of object under test 10.
Make proving installation of the present invention not only can determine the bending curvature of object under test 10, determine 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 10, in the present embodiment, as different from Example 6: in shaped form housing 4, vertically this shaped form housing 4 is divided into two parts along shaped form housing 4, each part all has A, the B both sides, and accompany first light-conductive optic fibre 6-1 and second light-conductive optic fibre 6-2 respectively at the A of each part side distortion tooth and B side distortion between cog respectively, a plurality of A side distortion tooth 4-3 of clamping second light-conductive optic fibre and a plurality of B side distortion tooth 4-4 are one-period along per 360 degree of shaped form housing, the starting point in each cycle is positioned at the same direction of shaped form housing, and as 0 angle, 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 trend is consistent, be monotone variation or all be dull increasing or dull the minimizing, the extension fibre of second light-conductive optic fibre 6-2 connects test cell 5, connects processing unit 7 behind the test cell 5.Like this when the first light-conductive optic fibre 6-1 detects the bending curvature of object under test 10, processing unit 7 is according to prior demarcation, the bending direction that attenuation loss that promptly the second light-conductive optic fibre 6-2 is different is corresponding different then draws the bending direction of object under test 10 by the loss value of the second light-conductive optic fibre 6-2.Make proving installation of the present invention not only can determine the bending curvature of object under test 10, determine 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 6.
As shown in figure 11, in the present embodiment, as different from Example 1: 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 shaped form housing 4 that contains light-conductive optic fibre 6 on the object under test 10, and the light-conductive optic fibre 6 in the described shaped form housing 4 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 light-conductive optic fibre 6 respectively by 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 the second light-conductive optic fibre 6-2 to reach the distortion tooth that changes by the cycle, can determine the direction of each part bending, processing unit 7 is by determining the bending curvature and the bending direction of the various piece that each shaped form housing 4 is initial and final, can provide the end-state of this object under test 10, and by display unit 20 outputs.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
Embodiment 9
As shown in figure 12, in the present embodiment, as different from Example 8: test cell 5 adopts optical time domain reflection technology (OTDR) or coincidence frequency modulated continuous wave technology (FMCW) testing tool to obtain the loss of a plurality of moment, each part light-conductive optic fibre 6 respectively, thereby can test out the variation of the curvature and the curvature of each position bending respectively, if when each sweep has the second light-conductive optic fibre 6-2 to reach the distortion tooth that changes by the cycle, can determine the variation of the direction and the direction of each position bending.Processing unit 7 can provide the end-state of this object under test 10 by determining the bending curvature and the bending direction of the various piece that each shaped form housing 4 is initial and final, and exports by display unit 20.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 8.
As shown in figure 13, in the present embodiment, as different from Example 8: each shaped form housing 4 is connected with test cell 5 by photoswitch 30, test cell 5 is by the gating function of photoswitch 30, obtain the loss of a plurality of moment, each part light-conductive optic fibre 6 respectively, thereby can test out the variation of the curvature and the curvature of each position bending respectively, if when each sweep has the second light-conductive optic fibre 6-2 to reach the distortion tooth that changes by the cycle, can determine the variation of the direction and the direction of each position bending.Processing unit 7 can provide the end-state of this object under test 10 by determining the bending curvature and the bending direction of the various piece that each shaped form housing 4 is initial and final, and exports by display unit 20.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 8.
The above; it only is preferred embodiment of the present invention; be not that the present invention is imposed any restrictions, everyly any simple modification that above embodiment did, change and equivalent structure changed, all still belong in the protection domain of technical solution of the present invention according to the technology of the present invention essence.
Claims (14)
1. the determinator of optical fiber bending parameter, it is characterized in that: a shaped form housing and a plurality of A side distortion teeth and a plurality of B side distortion tooth that vertically are laid in the relative both sides of described shaped form enclosure interior along the shaped form housing continuously, the two ends of shaped form housing are fixed on the object under test, being laid in the A side distortion tooth of shaped form enclosure interior and the relative position between the B side distortion tooth changes along with the variation of object under test bending curvature, described A side distortion tooth and B side distortion tooth are staggered and lay, and the distortion between cog at the two accompanies light-conductive optic fibre, A side distortion tooth and B side distortion tooth correspondence are laid in the light-conductive optic fibre both sides, and the extension optical fiber of light-conductive optic fibre is connected with test cell.
2. according to the determinator of the described optical fiber bending parameter of claim 1, it is characterized in that: the tooth pitch that a plurality of A sides of the relative both sides of described shaped form enclosure interior are out of shape between the teeth and a plurality of B side is out of shape between the tooth is uniform.
3. according to the determinator of the described optical fiber bending parameter of claim 1, it is characterized in that: the tooth depth of a plurality of A side distortion teeth of the relative both sides of described shaped form enclosure interior and a plurality of B side distortion tooth is identical.
4. according to the determinator of the described optical fiber bending parameter of claim 1, it is characterized in that: described shaped form housing is spiral fashion, Z word shape or plane wind spring shape.
5. according to the determinator of the described optical fiber bending parameter of claim 1, it is characterized in that: between the A side of described shaped form housing and the B side is to be connected by resilient material.
6. according to the determinator of the described optical fiber bending parameter of claim 4, it is characterized in that: A, the B side of described plane wind spring shape shaped form housing is two-layer up and down.
7. according to the determinator of any described optical fiber bending parameter of claim 1 to 6, it is characterized in that: in the shaped form housing, second light-conductive optic fibre arranged side by side with first light-conductive optic fibre, and second group of a plurality of A side distortion tooth and second group of a plurality of B side distortion tooth of being laid in the relative both sides of described shaped form enclosure interior continuously, second group of a plurality of A side distortion tooth and second group of a plurality of B side distortion between cog accompany second light-conductive optic fibre, described second group of a plurality of A side distortion tooth and second group of a plurality of B side distortion tooth are one-period along per 360 degree of shaped form housing, the starting point in each cycle is positioned at the same direction of shaped form housing, and as 0 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 trend is consistent.
8. according to the determinator of any described optical fiber bending parameter of claim 1 to 6, it is characterized in that: in the shaped form housing, vertically this shaped form housing is divided into two parts along the shaped form housing, each part has A respectively, the B both sides, and accompany first light-conductive optic fibre and second light-conductive optic fibre respectively, a plurality of A side distortion teeth of clamping second light-conductive optic fibre and a plurality of B side distortion tooth are one-period along per 360 degree of shaped form housing, the starting point in each cycle is positioned at the same direction of shaped form housing, and as 0 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 trend is consistent.
9. according to the determinator of any described optical fiber bending parameter of claim 1 to 6, it is characterized in that: second light-conductive optic fibre is arranged in the shaped form housing, and second group of a plurality of A side distortion tooth and second group of a plurality of B side distortion tooth of being laid in the relative both sides of described shaped form enclosure interior continuously, second group of a plurality of A side distortion tooth and second group of a plurality of B side distortion between cog accompany second light-conductive optic fibre, described second group of a plurality of A side distortion tooth and second group of a plurality of B side distortion tooth are one-period along per 360 degree of shaped form housing, do not 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 the same direction of shaped form housing.
10. according to the determinator of the described optical fiber bending parameter of claim 1, it is characterized in that: when object under test has more than one bending curvature to be measured, and be mounted with two ends at corresponding position and be fixed in the shaped form housing that contains light-conductive optic fibre on the object under test, and the light-conductive optic fibre in the described shaped form housing is cascaded.
11. determinator according to the described optical fiber bending parameter of claim 1, it is characterized in that: when object under test has more than one bending curvature to be measured, and be mounted with two ends at corresponding position and be fixed in the shaped form housing that contains light-conductive optic fibre on the object under test, and the light-conductive optic fibre in the described shaped form housing is connected to test cell by optical branching device.
12. the assay method of an optical fiber bending parameter, it is as follows to it is characterized in that detecting step:
1. be included in the demarcation of the scale factor of the light signal loss changing value of the light-conductive optic fibre in the shaped form housing and shaped form buckling of shells curvature:
The method of demarcating: the length that will contain the shaped form housing of light-conductive optic fibre locks under original state or linear state, utilize the circular arc of known bending curvature, the shaped form housing that will contain light-conductive optic fibre is according to the circular arc bending, and be recorded in the loss changing value of light-conductive optic fibre 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 C and light-conductive optic fibre loss changing value, its relation can be expressed as:
C
I＝K*Δα
I+ε????????????(a)
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;
2. the collection of the loss changing value of the light signal of light-conductive optic fibre transmission: the shaped form housing that contains light-conductive optic 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 light-conductive optic fibre also changes thereupon, obtain the loss changing value of light-conductive optic fibre by test cell, and this value passed to processing unit, wherein, shaped form housing 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;
3. processing unit utilizes light-conductive optic fibre loss changing value and formula (a) to provide the bending curvature of object under test.
13. assay method according to the described optical fiber bending parameter of claim 12, it is characterized in that: the length that timing signal will contain the shaped form housing of light-conductive optic fibre locks under original state or linear state, be to be fixed in the two ends of shaped form housing flexible but on the rhabodoid that length variations is ignored, rhabodoid can be metal bar, metal tube or macromolecular material rod.
14. according to the assay method of claim 12 or 13 described optical fiber bending parameters, it is as follows to it is characterized in that detecting step:
According to aforesaid detection method 1. to 3. step, can obtain the bending curvature of object under test, following detection step is to obtain the bending direction of object under test:
4. be included in the demarcation of the scale factor of the light signal loss changing value of second light-conductive optic fibre in the shaped form housing and shaped form buckling of shells curvature and bending direction:
The method of demarcating: the circular arc that utilizes known bending curvature, to contain the different angle of the shaped form housing conversion of second light-conductive optic fibre according to the circular arc bending, and the loss changing value of second light-conductive optic fibre 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 second light-conductive optic 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)*Δα
θ+ε
θ????????????????(b)
In the formula: θ represents the bending direction angle that timing signal is different, and C represents 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;
5. the collection of the loss changing value of the light signal of second light-conductive optic fibre transmission: two ends be fixed on the object under test the shaped form housing that contains second light-conductive optic fibre along with the bending of object under test and crooked, the loss value of second light-conductive optic fibre 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 second light-conductive optic fibre by test cell, and this value is passed to processing unit;
6. processing unit utilizes the bending direction angle that bending curvature that the second light-conductive optic fibre loss changing value, first light-conductive optic fibre determine and formula (b) provide object under test.
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