CN202522352U - Sole pressure measurement device based on optical fiber grating - Google Patents
Sole pressure measurement device based on optical fiber grating Download PDFInfo
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- CN202522352U CN202522352U CN2012201803174U CN201220180317U CN202522352U CN 202522352 U CN202522352 U CN 202522352U CN 2012201803174 U CN2012201803174 U CN 2012201803174U CN 201220180317 U CN201220180317 U CN 201220180317U CN 202522352 U CN202522352 U CN 202522352U
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- fiber
- optical fiber
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- branching device
- grating sensor
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Abstract
The utility model discloses a sole pressure measurement device based on an optical fiber grating, which comprises a sole, a light source, an isolator, optical fiber grating sensors, optical splitters, a multi-pass switch, a single demodulator and a computer, wherein the optical fiber grating sensors are respectively mounted at the heel, a first basidigital bone and a fifth basidigital bone of the sole; light given out by the light source is transmitted to three optical fiber grating sensors by the optical fiber via an isolator and a one-to-three optical splitter; the wavelength of reflective light drifts under an effect of sole pressure of the three optical fiber grating sensors; the drifted reflective light is transmitted to the signal demodulator via a one-to-two optical splitter and a multi-pass switch for demodulation, a demodulated electric signal is transmitted to the computer via a wire for corresponding data processing and result display, so as to obtain sole pressure parameters. The sole pressure measurement device has the advantages of simple structure, high measurement precision and reliable quality and the like, is suitable for relative foot diagnosing and human body gait analysis.
Description
Technical field
The utility model relates to a kind of foot force measurement mechanism, relates in particular to a kind of foot force measurement mechanism based on fiber grating.
Background technology
Foot force plays an important role in relevant sufficient disease diagnosis, body gait analysis even other diseases diagnosis as an important physical parameter.Accurately measure foot force relevant gait analysis and medical diagnosis on disease are had bigger influence.At present, the foot force measurement mechanism adopts strain chip or piezoelectric pressure indicator gaging pressure more, and its measuring accuracy is limited, and serviceable life is short, makes complicatedly, and pressure transducer has certain volume, places sole to influence the sole comfortableness.
Summary of the invention
In order to overcome above-mentioned prior art shortcoming, the purpose of the utility model is to provide a kind of foot force measurement mechanism based on fiber grating, is characterized in simple in structure, size is little, precision is high.
The technical scheme that the utility model adopted is: a kind of foot force measurement mechanism based on fiber grating comprises sole (1), light source (9); Isolator (15); Fiber-optic grating sensor (5), (6), (7), optical branching device (11), (18), (19), (20), multi-pass switch (2); Demodulator of PM signal PM (3), computing machine (8).Fiber-optic grating sensor (7) is installed at heel place at sole (1), and fiber-optic grating sensor (6) is installed at the first metatarsal bone place, and fiber-optic grating sensor (5) is installed at the fifth metatarsal bone place.Light source (9) connects isolator (15) through optical fiber (1000), and isolator (15) connects one minute three optical branching device (11) through optical fiber (1001).One minute three optical branching device (11) draw optical fiber (1002), (1003), (1004); Optical fiber (1002) is connected to one-to-two optical branching device (19); One-to-two optical branching device (19) is connected to fiber-optic grating sensor (6) through optical fiber (1007), is connected to multi-pass switch (2) through optical fiber (1008); Optical fiber (1003) is connected to one-to-two optical branching device (20), and one-to-two optical branching device (20) is connected to fiber-optic grating sensor (7) through optical fiber (1005), is connected to multi-pass switch (2) through optical fiber (1010); Optical fiber (1004) is connected to one-to-two optical branching device (18), and one-to-two optical branching device (18) is connected to fiber-optic grating sensor (5) through optical fiber (1006), is connected to multi-pass switch (2) through optical fiber (1009).Multi-pass switch (2) is connected to demodulator of PM signal PM (3) through optical fiber (1011), and demodulator of PM signal PM (3) is connected to computing machine (8) through electric wire (4) signal after the demodulation is carried out handled, obtains the foot force parameter.
Described fiber-optic grating sensor (5), fiber-optic grating sensor (6), its structure size of fiber-optic grating sensor (7) and specification are all identical; All adopt grating (14) to be packaged in polymkeric substance (13) substrate of corrugated tube (12) seal protection, through polymkeric substance (13) to external world the perception of pressure be delivered to grating (14) and go up realize the pressure enhanced sensitivity.
Described demodulator of PM signal PM (3) is based on tunable F-P chamber method.
The beneficial effect of the utility model is: this plant bulk is little, simple in structure, and be convenient for measuring and make, and high reliability and long serviceable life.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
Fig. 1 is the structural representation of the utility model;
Fig. 2 is the fiber-optic grating sensor sectional drawing;
Fig. 3 is the demodulator of PM signal PM schematic diagram.
In the accompanying drawing: 1 is sole; 2 is the multichannel photoswitch; 3 is demodulator of PM signal PM; 4 is electric wire; 5,6,7 is three identical fiber-optic grating sensors; 8 is computing machine; 9 is light source; 10,1000,1001,1002,1003,1004,1005,1006,1007,1008,1009,1010,1011 be optical fiber; 11 is one minute three optical branching device; 12 is corrugated tube; 13 is polymkeric substance; 14 is grating; 15 isolators; 16 is detector; 17 is tunable F-P chamber; 18,19,20 is the one-to-two optical branching device.
Embodiment
Elaborate below in conjunction with structural principle of the present invention and principle of work:
Among Fig. 1, a kind of foot force measurement mechanism based on fiber grating comprises sole 1, light source 9, isolator 15, fiber- optic grating sensor 5,6,7, optical branching device 11,18,19,20, multi-pass switch 2, demodulator of PM signal PM 3, computing machine 8.Fiber-optic grating sensor 7 is installed at heel place at sole 1, and fiber-optic grating sensor 6 is installed at the first metatarsal bone place, and fiber-optic grating sensor 5 is installed at the fifth metatarsal bone place.Light source 9 connects isolator 15 through optical fiber 1000, and isolator 15 connects one minute three optical branching device 11 through optical fiber 1001.Optical branching device 11 was drawn optical fiber 1002,1003,1004 in one minute three, and optical fiber 1002 is connected to one-to-two optical branching device 19, and one-to-two optical branching device 19 is connected to fiber-optic grating sensor 6 through optical fiber 1007, is connected to multi-pass switch 2 through optical fiber 1008; Optical fiber 1003 is connected to one-to-two optical branching device 20, and one-to-two optical branching device 20 is connected to fiber-optic grating sensor 7 through optical fiber 1005, is connected to multi-pass switch 2 through optical fiber 1010; Optical fiber 1004 is connected to one-to-two optical branching device 18, and one-to-two optical branching device 18 is connected to fiber-optic grating sensor 5 through optical fiber 1006, is connected to multi-pass switch 2 through optical fiber 1009.Multi-pass switch 2 is connected to demodulator of PM signal PM 3 through optical fiber 1011, and demodulator of PM signal PM 3 carries out handled through the signal that electric wire 4 is connected to after 8 pairs of demodulation of computing machine, obtains the foot force parameter.
Fig. 2 is the fiber-optic grating sensor sectional drawing; Fiber- optic grating sensor 5,6,7; Its structure size and specification are all identical; All adopt grating 14 to be packaged in polymkeric substance 13 substrates of corrugated tube 12 seal protections, through polymkeric substance 13 to external world the perception of pressure be delivered on the grating 14 and realize the pressure enhanced sensitivity.Corrugated tube 12 wherein directly contacts with people's sole, when grating 14 receives corresponding radial stress, can produce miniature deformation.
Fig. 3 is the demodulation principle that embodiment explains demodulator of PM signal PM 3 with fiber-optic grating sensor 5 with one-to-two optical branching device 18.Demodulator of PM signal PM 3 is based on tunable F-P chamber method, and its demodulating system is to be made up of light source 9, isolator 15, one-to-two optical branching device 18, tunable F-P chamber 17, detector 16 and fiber-optic grating sensor 5.The light that sends from light source 9 passes through Optical Fiber Transmission to isolator 15, then is transferred to fiber-optic grating sensor 5 through one-to-two optical branching device 18, and light is through fiber-optic grating sensor 5 reflections, and reflected light is transferred in the tunable F-P chamber 17 through one-to-two optical branching device 18.The piezoelectric ceramics voltage of regulating tunable F-P chamber 17 makes detector 16 detect largest light intensity, and at this moment, the transmission peak wavelength in tunable F-P chamber 17 overlaps with the wavelength of fiber-optic grating sensor 5 reflections, thereby obtains the size of reflection wavelength.3 pairs of fiber-optic grating sensors 6 of demodulator of PM signal PM, said embodiment is identical in the demodulation of fiber-optic grating sensor 7 measuring-signals and demodulator of PM signal PM 3 pairs of fiber-optic grating sensors, 5 measuring-signal demodulation.
Principle of work of the present invention:
According to the ultimate principle of fiber grating gaging pressure, the variation of pressure can cause the pitch and the change of refractive of fiber grating, thereby the reflectance spectrum of fiber grating is changed.Variation through detection fiber optical grating reflection spectrum or transmission spectrum just can obtain corresponding pressure information.According to the optical fiber coupled-mode theory, when broadband light is transmitted, produce Mode Coupling in optical fiber Bragg raster, the light that satisfies the Bragg condition is reflected:
λ
B＝2n
effΛ
Wherein, n
EffBe the effective refractive index of guided mode, Λ is a grid cycle.So, the foveal reflex wavelength X of fiber grating
BChange with n
EffChange with Λ.
When fiber grating radially produced strain, because the flexible and elasto-optical effect in grating cycle, the cloth loudspeaker lattice wave long hair of fiber grating was given birth to drift.When radial stress changed (Δ P), the reflection wavelength of optical fiber Bragg raster also can change, and can be expressed as:
Wherein Δ P is the variation of radial stress, elastic modulus, the P that E is optical fiber
Ij(j=1,2) are that pockel coefficient, v are Poisson ratio.So, can reflect the size of the suffered radial stress of grating indirectly through measuring optical fiber grating foveal reflex wavelength change.
A kind of foot force measurement mechanism groundwork principle based on fiber grating is: open light source 9, light reaches isolator 15 through optical fiber 10, and imports sensing unit into through one minute three optical branching device 11.When the naked pin of people stands on the sole place, people's sole directly contacts with corrugated tube 12, and fiber- optic grating sensor 5,6,7 receives corresponding radial effect power respectively, makes the bragg reflection wavelength of grating 14 change.Light through after fiber- optic grating sensor 5,6,7 reflections passes to multi-pass switch 2 through one-to-two optical branching device 18,19,20 respectively; Control through multi-pass switch 2; Three road light successively entering signal detuner 3 carry out demodulation; At last the electric signal after the demodulation is passed to computing machine 8 through electric wire 4 and carry out corresponding data processing and demonstration, record the suffered pressure size of fiber-optic grating sensor of installing at sole three places, thereby obtain people's foot force information.
Above-mentioned a kind of foot force measurement mechanism based on fiber grating is mainly explained this device formation, structure and principle; Can expand to both feet and measure simultaneously; Also be applicable to single pin measurement; According to the different sizes of people's pin, different pin type, this device size shape can adjust, and all belongs to the protection domain of this invention simultaneously.
Claims (3)
1. the foot force measurement mechanism based on fiber grating is characterized in that, comprises sole (1), light source (9); Isolator (15), fiber-optic grating sensor (5), (6), (7), optical branching device (11), (18), (19), (20); Multi-pass switch (2), demodulator of PM signal PM (3), computing machine (8); Fiber-optic grating sensor (7) is installed at heel place at sole (1); Fiber-optic grating sensor (6) is installed at the first metatarsal bone place; Fiber-optic grating sensor (5) is installed at the fifth metatarsal bone place, and light source (9) connects isolator (15) through optical fiber (1000), and isolator (15) connects one minute three optical branching device (11) through optical fiber (1001); One minute three optical branching device (11) draw optical fiber (1002), (1003), (1004); Optical fiber (1002) is connected to one-to-two optical branching device (19), and one-to-two optical branching device (19) is connected to fiber-optic grating sensor (6) through optical fiber (1007), is connected to multi-pass switch (2) through optical fiber (1008); Optical fiber (1003) is connected to one-to-two optical branching device (20), and one-to-two optical branching device (20) is connected to fiber-optic grating sensor (7) through optical fiber (1005), is connected to multi-pass switch (2) through optical fiber (1010); Optical fiber (1004) is connected to one-to-two optical branching device (18); One-to-two optical branching device (18) is connected to fiber-optic grating sensor (5) through optical fiber (1006); Be connected to multi-pass switch (2) through optical fiber (1009); Multi-pass switch (2) is connected to demodulator of PM signal PM (3) through optical fiber (1011), and demodulator of PM signal PM (3) is connected to computing machine (8) through electric wire (4) signal after the demodulation is carried out handled, obtains the foot force parameter.
2. according to claim 1 a kind of based on fiber grating foot force measurement mechanism; It is characterized in that: described fiber-optic grating sensor (5), fiber-optic grating sensor (6), its structure size of fiber-optic grating sensor (7) and specification are all identical; All adopt grating (14) to be packaged in polymkeric substance (13) substrate of corrugated tube (12) seal protection, through polymkeric substance (13) to external world the perception of pressure be delivered to grating (14) and go up realize the pressure enhanced sensitivity.
3. according to claim 1 a kind of based on fiber grating foot force measurement mechanism, it is characterized in that: described demodulator of PM signal PM (3) is based on tunable F-P chamber method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201803174U CN202522352U (en) | 2012-04-20 | 2012-04-20 | Sole pressure measurement device based on optical fiber grating |
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| CN2012201803174U CN202522352U (en) | 2012-04-20 | 2012-04-20 | Sole pressure measurement device based on optical fiber grating |
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| CN202522352U true CN202522352U (en) | 2012-11-07 |
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| CN2012201803174U Expired - Fee Related CN202522352U (en) | 2012-04-20 | 2012-04-20 | Sole pressure measurement device based on optical fiber grating |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105725982A (en) * | 2016-01-25 | 2016-07-06 | 东华大学 | Shoe sole pressure and temperature measuring insole based on optical fiber sensing technology |
| CN106913342A (en) * | 2017-03-30 | 2017-07-04 | 武汉纺织大学 | A kind of gait test system and method based on fiber grating and pressure sensor |
| WO2017171660A1 (en) * | 2016-04-01 | 2017-10-05 | Nanyang Technological University | Foot joint health diagnosis system |
| CN111631722A (en) * | 2020-05-18 | 2020-09-08 | 北京航空航天大学 | Parkinson's gait analysis system and method based on optical fiber microbend pressure sensing |
-
2012
- 2012-04-20 CN CN2012201803174U patent/CN202522352U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105725982A (en) * | 2016-01-25 | 2016-07-06 | 东华大学 | Shoe sole pressure and temperature measuring insole based on optical fiber sensing technology |
| WO2017171660A1 (en) * | 2016-04-01 | 2017-10-05 | Nanyang Technological University | Foot joint health diagnosis system |
| CN106913342A (en) * | 2017-03-30 | 2017-07-04 | 武汉纺织大学 | A kind of gait test system and method based on fiber grating and pressure sensor |
| CN111631722A (en) * | 2020-05-18 | 2020-09-08 | 北京航空航天大学 | Parkinson's gait analysis system and method based on optical fiber microbend pressure sensing |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121107 Termination date: 20130420 |