CN102486423A - Double optical reflectors-based dynamic torque optical fiber sensing device - Google Patents
Double optical reflectors-based dynamic torque optical fiber sensing device Download PDFInfo
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- CN102486423A CN102486423A CN2010105733994A CN201010573399A CN102486423A CN 102486423 A CN102486423 A CN 102486423A CN 2010105733994 A CN2010105733994 A CN 2010105733994A CN 201010573399 A CN201010573399 A CN 201010573399A CN 102486423 A CN102486423 A CN 102486423A
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Abstract
The invention discloses a double optical reflectors-based dynamic torque optical fiber sensing device, which comprises a spiral structure, a rotating shaft, a light source, a 1*2 optical coupler, a photodetector and a processing unit, wherein a plurality of A side deformation teeth and a plurality of B side deformation teeth are arranged at two opposite sides in the spiral structure, the relative positions of the A side deformation teeth and the B side deformation teeth change along the change of the torque of the rotating shaft, the A side deformation teeth and the B side deformation teeth are in staggered arrangement, a signal optical fiber is clamped between each A side deformation tooth and each B side deformation tooth, the signal optical fibers at the two ends of the spiral structure are respectively provided with an optical reflector 1 and an optical reflector 2, one end of the rotating shaft is provided with an optical fiber rotating connector, the signal optical fibers are connected with the input end of the 1*2 optical coupler through the optical fiber rotating connector and transmission optical fibers, the optical source and the photodetector are respectively connected with the output end of the 1*2 optical coupler, and the photodetector is connected with the processing unit. The double optical reflectors-based dynamic torque optical fiber sensing device disclosed by the invention has the advantages that the operation is simple, the cost is low, and the precision is improved.
Description
Technical field
The invention belongs to sensor technical field, particularly a kind of dynamic torque fibre-optical sensing device based on two reflective optical systems.
Background technology
In machine driven system, measuring the moment of torsion of rotation axis and the method majority of power is to adopt the foil gauge that sticks on the axle to carry out.The data of foil gauge are passed to pick-up unit through slip ring or Wireless transmission mode; The former has wearing and tearing and can not use in inflammable and explosive occasion; The latter needs on rotation axis, to install battery and electric power is provided for test component and wireless launcher; And the use under strong electromagnetic interference environment can be interfered, and this has all limited the usable range of foil gauge class torque-measuring apparatus.
A kind of newer test macro is that the pulse delay method that adopts is measured the torsion angle of rotation axis, thereby reaches the purpose that detects moment of torsion and power.United States Patent (USP) 4520681 discloses a kind of system that utilizes the pulse daley principle, and it mainly is on rotation axis, at a distance of certain distance two rotary encoders to be installed.Utilize two impulse time delaies on the scrambler to confirm the torsion angle of rotation axis, can obtain the moment of torsion and the power of rotation axis again according to the torsion modulus of rotation axis.Rotary encoder and supporting with it sensor can be based on magnetic induction principle, photoelectricity sensing principle, and the complex structure of two kinds of devices, test dynamic range are little, and sensitivity has much room for improvement, also is not suitable for the forceful electric power magnetic environment under use, has certain limitation.
Summary of the invention
The objective of the invention is to overcome above-mentioned deficiency of the prior art, a kind of dynamic torque fibre-optical sensing device based on two reflective optical systems is provided.The present invention is easy and simple to handle, and cost is low, and precision improves, and measurement range enlarges, and anti-electromagnetic interference (EMI).
For realizing above-mentioned purpose; The technical scheme that the present invention adopts is: based on the dynamic torque fibre-optical sensing device of two reflective optical systems; It is characterized in that: comprise helical structure, rotation axis, light source, 1X2 photo-coupler, photo-detector and processing unit; Inner both sides relatively of said helical structure and the said helical structure in edge are vertically arranged with a plurality of A sides distortion teeth and a plurality of B side distortion tooth, and the two ends of helical structure are fixed on the rotation axis at least, and the relative position between said A side distortion tooth and the B side distortion tooth changes along with the variation of rotation axis moment of torsion; Said A side distortion tooth and B side distortion tooth interleaved are laid; And accompany signal optical fibre at A side distortion tooth and B side distortion between cog, A side distortion tooth and B side distortion tooth correspondence are laid in the signal optical fibre both sides, on the signal optical fibre at helical structure two ends, are mounted with reflective optical system one and reflective optical system two respectively; Termination at rotation axis is equipped with fiber rotation connector; Signal optical fibre is connected with the input end of Transmission Fibers with the 1X2 photo-coupler through fiber rotation connector, and light source and photo-detector connect the output terminal of 1X2 photo-coupler respectively, and photo-detector is connected with processing unit.
The above-mentioned dynamic torque fibre-optical sensing device based on two reflective optical systems, said helical structure are the spiral shaped housing that is arranged on the rotation axis surface.
The above-mentioned dynamic torque fibre-optical sensing device based on two reflective optical systems, the inner A side of described spiral shaped housing is to be connected through resilient material with the B side.
Relative A, B both sides that the above-mentioned dynamic torque fibre-optical sensing device based on two reflective optical systems, described spiral shaped housing inside are laid with the distortion tooth are parallel to each other, and simultaneously with the centre of twist parallel axes of rotation axis.
The above-mentioned Dynamic High-accuracy moment of torsion fibre-optical sensing device based on two reflective optical systems, the optical signal pulses width of said light source output is less than the length of signal optical fibre twice between reflective optical system one and the reflective optical system two.
The above-mentioned dynamic torque fibre-optical sensing device based on two reflective optical systems, said signal optical fibre outside are surrounded by multilayer protection optical fiber, and said protection optical fiber is a kind of in tight tube fiber, carbon coated fiber, the polyimide coated optical fiber.
The above-mentioned dynamic torque fibre-optical sensing device based on two reflective optical systems, said signal optical fibre is plastic optical fiber or photonic crystal fiber.
The above-mentioned dynamic torque fibre-optical sensing device based on two reflective optical systems, described reflective optical system one and reflective optical system two are for light reflection mirror, fiber grating or contain a kind of in the optical fiber of bubble.
Above-mentioned dynamic torque fibre-optical sensing device based on two reflective optical systems; Said helical structure is the groove that is arranged on the rotation axis surface; Relative both sides in said groove are laid with a plurality of A side distortion teeth and a plurality of B side distortion tooth; Said A side distortion tooth and B side distortion tooth interleaved are laid, and accompany signal optical fibre at A side distortion tooth and B side distortion between cog.
The present invention compared with prior art has the following advantages:
1, adopts all optical fibre structure, can effectively prevent electromagnetic interference (EMI), and can be used in the dangerous working environment;
2, the signal optical fibre as measuring sensor can adopt common telecommunication optical fiber or other special optical fibers, utilizes the measure of the change moment of torsion of transmission or reflected optical power, can realize high-precision measuring;
3, should be simple in structure based on the dynamic torque fibre-optical sensing device of two reflective optical systems, easy mounting, more common torque sensor can have lower cost;
4, this this based on the dynamic torque fibre-optical sensing device of two reflective optical systems can realize at a distance, distributed measurement, and that this is traditional sensor is not available;
5, pass through the structure of two reflective optical systems; Fluctuation, photo-detector changes of properties, the influence of fiber rotation connector and the loss of optical fiber link of having eliminated light source output optical signal power change; Make this device have higher measuring accuracy; Solve the problem of the high precision torque measurement of rotation axis under dynamically, had promotional value.
In sum, the present invention is simple in structure, reasonable in design, processing and fabricating convenient and use-pattern is flexible, highly sensitive, result of use is good, has broad application prospects.
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 schematic cross-section of spiral shaped housing among Fig. 1.
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 cross-sectional view of A-A direction among Fig. 5.
Description of reference numerals:
The 1-Transmission Fibers; The 4-spiral shaped housing; The 5-groove;
4-1-A side distortion tooth; 4-2-B side distortion tooth; The 6-fiber rotation connector;
The 8-1X2 photo-coupler; The 9-processing unit; The 10-light source;
The 11-photo-detector; The 12-rotation axis; 14-bearing one;
15-reflective optical system one; 16-reflective optical system two; 17-bearing two;
30-centre of twist axis; The 33-signal optical fibre; The 35-resilient material.
Embodiment
Like Fig. 1, a kind of dynamic torque fibre-optical sensing device shown in Figure 2 based on two reflective optical systems; Comprise helical structure, rotation axis 12, light source 10,1X2 photo-coupler 8, photo-detector 11 and processing unit 9; Inner both sides relatively of said helical structure and the said helical structure in edge are vertically arranged with a plurality of A sides distortion tooth 4-1 and a plurality of B side distortion tooth 4-2; At least the two ends of helical structure are fixed on the rotation axis 12; Relative position between said A side distortion tooth 4-1 and the B side distortion tooth 4-2 changes along with the variation of rotation axis 12 moments of torsion; Said A side distortion tooth 4-1 and B side distortion tooth 4-2 interleaved are laid; And between A side distortion tooth 4-1 and B side distortion tooth 4-2, accompany signal optical fibre 33, A side distortion tooth 4-1 and B side distortion tooth 4-2 correspondence are laid in signal optical fibre 33 both sides, on the signal optical fibre 33 at helical structure two ends, are mounted with reflective optical system 1 and reflective optical system 2 16 respectively; Termination at rotation axis 12 is equipped with fiber rotation connector 6; Signal optical fibre 33 is connected with the input end of Transmission Fibers 1 with 1X2 photo-coupler 8 through fiber rotation connector 6, and light source 10 and photo-detector 11 connect the output terminal of 1X2 photo-coupler 8 respectively, and photo-detector 11 is connected with processing unit 9.
The said helical structure of helical structure is the spiral shaped housing 4 that is arranged on rotation axis 12 surfaces in the present embodiment; Said rotation axis 12 can rotate with bearing 2 17 around the bearing 1 that is separately positioned on it; On spiral shaped housing 4 inner both sides relatively, be laid with a plurality of A side distortion tooth 4-1 and a plurality of B side distortion tooth 4-2; At least the two ends of spiral shaped housing 4 are fixed on the rotation axis 12; Preferred way is to be laid in the modes such as bonding or welding of spiral shaped housing 4 total lengths through adhesive to be fixed on the rotation axis 12; Said A side distortion tooth 4-1 and B side distortion tooth 4-2 interleaved are laid; And the distortion between cog at the two accompanies signal optical fibre 33; Also change because of reversing certain angle rear screw shape housing 4 end positions under the torsional interaction at rotation axis 12; Vertically be laid in a plurality of A side distortion tooth 4-1 of said spiral shaped housing 4 inner both sides relatively and the position change between a plurality of B side distortion tooth 4-2 along spiral shaped housing 4; Thereby make to be clipped in bending curvature that both are out of shape the signal optical fibre 33 of between cog and to reduce or increase and cause the power of the light signal of transmission in the signal optical fibre 33 to increase or reduce, signal optical fibre 33 is connected with light source 10, photo-detector 11 through fiber rotation connector 6, Transmission Fibers 1 and 1X2 photo-coupler 8, on the signal optical fibre 33 at spiral shaped housing 4 two ends, is mounted with reflective optical system 1 and reflective optical system 2 16; When the optical signal power of transmission changes in the signal optical fibre 33 that spiral shaped housing 4 comprises; Can cause the incident optical signal power of the back reflective optical system 2 16 on the signal optical fibre 33 to reduce, the reflectivity of this reflective optical system 2 16 itself is constant, thereby the latter's reflected light signal power is significantly reduced; And the light signal of previous reflective optical system 1 is not through the signal optical fibre 33 in the spiral shaped housing 4; So the power of its reflected light signal is only relevant with the link attenuation of light source 10, photo-detector 11, fiber rotation connector 6 and the Transmission Fibers 1 passed through, thereby makes photo-detector 11 detect the reflected light signal power of two reflective optical systems and carry out difference and amplify, just can isolate signal optical fibre 33 reducing signal and will pass to processing unit 9 in the spiral shaped housing 4 because of the crooked optical signal power that causes to signal; Processing unit 9 draws corresponding torque through the latter's the information and the physical constant that reverses of rotation axis 12, reaches the purpose to rotation axis 12 torque ratings.
Described light source 10 light signals output, entering signal optical fiber 33 are pulsed optical signals.A kind of preferred way is that the optical signal pulses width of said light source 10 outputs is less than the length of signal optical fibre 33 twices between reflective optical system 1 and the reflective optical system 2 16.
A kind of preferred way be described spiral shaped housing 4 inside be laid with the distortion tooth relative A, B both sides be parallel to each other; And it is simultaneously parallel with the centre of twist axis 30 of rotation axis 12; Then A side and B side have different distances with respect to the centre of twist axis 30 of rotation axis 12; When windup-degree occurring under the effect of rotation axis 12 at moment of torsion; Have at least two ends to be fixed in the inner A of spiral shaped housing 4 on the rotation axis 12, B both sides and also need elongate or shorten reversing under the identical angle, but A, B both sides are different with respect to the distance of centre of twist axis 30, the length that then need elongate or shorten apart from a side of centre of twist axis 30 distance is more; And under the help that does not have other external force, do not accomplish; At this moment apart from a side of centre of twist axis 30 distance will to apart from the near side of centre of twist axis 30 distances near or become estranged, be laid in the inner A sides distortion tooth 4-1 of spiral shaped housing 4 and the relative distance between the B side distortion tooth 4-2 and reduce or increase thereby make, and cause accompanying the variation of the bending curvature of signal optical fibre 33 at the distortion between cog of the two; And make the variation of the optical signal power of signal optical fibre 33 internal transmission; Photo-detector 11 reflected optical power through former and later two reflective optical systems of test poor, and difference passed to processing unit 9, processing unit 9 is extrapolated the size of the moment of torsion that bears on the rotation axis 12.
Said signal optical fibre 33 outsides are surrounded by multilayer protection optical fiber, and said protection optical fiber is a kind of in tight tube fiber, carbon coated fiber, the polyimide coated optical fiber.Said signal optical fibre 33 is plastic optical fiber or photonic crystal fiber.
For improving measuring accuracy; Described Transmission Fibers 1 is dissimilar optical fiber with signal optical fibre 33; Like signal optical fibre 33 is that multimode, photonic crystal fiber or quartzy covering external diameter are 80 microns mini optical fibres; And Transmission Fibers 1 be communication with the G.652 type single-mode fiber of standard, the advantage of doing like this be increase substantially measuring accuracy on the one hand, reduce the internal stress of signal optical fibre 33, the serviceable life of prolongation signal optical fibre 33, reduced application cost on the other hand again; And when remote the use, reduce since temperature, stress to the be added to influence of the decay in the optical power change signal in the signal optical fibre 33 of the meeting of Transmission Fibers 1.
Embodiment 2
As shown in Figure 3; In the present embodiment; Different with embodiment 1 is: the inner A side of described spiral shaped housing 4 and B side are except spiral shaped housing 4 two ends are connected; Remainder does not connect, and the A side has bigger shift in position with respect to the B side when rotation axis 12 reverses, thereby makes test result more accurate.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: described spiral shaped housing 4 inner A sides are to be connected through resilient material 35 with the B side, and the A side has bigger shift in position with respect to the B side when rotation axis 12 reverses, thus the accuracy of raising test result.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
Embodiment 3
Like Fig. 5, shown in Figure 6; In the present embodiment; Different with embodiment 1 is: said spiral shaped housing is the groove 5 that is arranged on the surface of rotation axis 12; Relative both sides in groove 5 are laid with a plurality of A sides distortion tooth 4-1 and a plurality of B side distortion tooth 4-2, said A side distortion tooth 4-1 and the laying of B side distortion tooth 4-2 interleaved, and accompany signal optical fibre 33 at the two distortion between cog.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
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 dynamic torque fibre-optical sensing device of two reflective optical systems; It is characterized in that: comprise helical structure, rotation axis (12), light source (10), 1X2 photo-coupler (8), photo-detector (11) and processing unit (9); Inner both sides relatively of said helical structure and the said helical structure in edge are vertically arranged with a plurality of A sides distortion teeth (4-1) and a plurality of B side distortion tooth (4-2); At least the two ends of helical structure are fixed on the rotation axis (12); Relative position between said A side distortion tooth (4-1) and the B side distortion tooth (4-2) changes along with the variation of rotation axis (12) moment of torsion; Said A side distortion tooth (4-1) and B side distortion tooth (4-2) interleaved are laid; And between A side distortion tooth (4-1) and B side distortion tooth (4-2), accompany signal optical fibre (33), A side distortion tooth (4-1) and B side distortion tooth (4-2) correspondence are laid in signal optical fibre (33) both sides, on the signal optical fibre (33) at helical structure two ends, are mounted with reflective optical system one (15) and reflective optical system two (16) respectively; In a termination of rotation axis (12) fiber rotation connector (6) is installed; Signal optical fibre (33) is connected with the input end of Transmission Fibers (1) with 1X2 photo-coupler (8) through fiber rotation connector (6), and light source (10) and photo-detector (11) connect the output terminal of 1X2 photo-coupler (8) respectively, and photo-detector (11) is connected with processing unit (9).
2. the dynamic torque fibre-optical sensing device based on two reflective optical systems according to claim 1 is characterized in that: said helical structure is for being arranged on the spiral shaped housing (4) on rotation axis (12) surface.
3. the dynamic torque fibre-optical sensing device based on two reflective optical systems according to claim 2 is characterized in that: the inner A side of described spiral shaped housing (4) is to be connected through resilient material (35) with the B side.
4. the dynamic torque fibre-optical sensing device based on two reflective optical systems according to claim 2; It is characterized in that: relative A, B both sides that described spiral shaped housing (4) inside is laid with the distortion tooth are parallel to each other, and simultaneously parallel with the centre of twist axis (30) of rotation axis (12).
5. the Dynamic High-accuracy moment of torsion fibre-optical sensing device based on two reflective optical systems according to claim 2 is characterized in that: the optical signal pulses width of said light source (10) output is less than the length of signal optical fibre (33) twice between reflective optical system one (15) and the reflective optical system two (16).
6. the dynamic torque fibre-optical sensing device based on two reflective optical systems according to claim 2; It is characterized in that: said signal optical fibre (33) outside is surrounded by multilayer protection optical fiber, and said protection optical fiber is a kind of in tight tube fiber, carbon coated fiber, the polyimide coated optical fiber.
7. the dynamic torque fibre-optical sensing device based on two reflective optical systems according to claim 2 is characterized in that: said signal optical fibre (33) is plastic optical fiber or photonic crystal fiber.
8. the dynamic torque fibre-optical sensing device based on two reflective optical systems according to claim 2 is characterized in that: described reflective optical system one (15) and reflective optical system two (16) is for light reflection mirror, fiber grating or contain a kind of in the optical fiber of bubble.
9. the dynamic torque fibre-optical sensing device based on two reflective optical systems according to claim 1; It is characterized in that: said helical structure is for being arranged on the groove (5) on rotation axis (12) surface; Relative both sides in said groove (5) are laid with a plurality of A side distortion teeth (4-1) and a plurality of B side distortion tooth (4-2); Said A side distortion tooth (4-1) and B side distortion tooth (4-2) interleaved are laid, and between A side distortion tooth (4-1) and B side distortion tooth (4-2), accompany signal optical fibre (33).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105733994A CN102486423A (en) | 2010-12-03 | 2010-12-03 | Double optical reflectors-based dynamic torque optical fiber sensing device |
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| CN2010105733994A CN102486423A (en) | 2010-12-03 | 2010-12-03 | Double optical reflectors-based dynamic torque optical fiber sensing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837273A (en) * | 2014-02-27 | 2014-06-04 | 中国电子科技集团公司第八研究所 | Stress monitoring device and manufacturing method |
| CN114235035A (en) * | 2021-11-29 | 2022-03-25 | 浙江大学 | Torque and temperature multi-parameter sensing device based on fiber bragg grating |
-
2010
- 2010-12-03 CN CN2010105733994A patent/CN102486423A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837273A (en) * | 2014-02-27 | 2014-06-04 | 中国电子科技集团公司第八研究所 | Stress monitoring device and manufacturing method |
| CN114235035A (en) * | 2021-11-29 | 2022-03-25 | 浙江大学 | Torque and temperature multi-parameter sensing device based on fiber bragg grating |
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Application publication date: 20120606 |