CN87107210A - Microbend fiber optic strain gauge - Google Patents
Microbend fiber optic strain gauge Download PDFInfo
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- CN87107210A CN87107210A CN87107210.6A CN87107210A CN87107210A CN 87107210 A CN87107210 A CN 87107210A CN 87107210 A CN87107210 A CN 87107210A CN 87107210 A CN87107210 A CN 87107210A
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- optical fiber
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- 239000000835 fiber Substances 0.000 title claims description 13
- 239000013307 optical fiber Substances 0.000 claims abstract description 68
- 239000011248 coating agent Substances 0.000 claims abstract description 10
- 238000000576 coating method Methods 0.000 claims abstract description 10
- 239000004642 Polyimide Substances 0.000 claims abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229920001721 polyimide Polymers 0.000 claims abstract description 6
- 239000004411 aluminium Substances 0.000 claims abstract description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000010931 gold Substances 0.000 claims abstract description 5
- 229910052737 gold Inorganic materials 0.000 claims abstract description 5
- 230000003287 optical effect Effects 0.000 claims abstract description 5
- 238000007747 plating Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 13
- 239000011521 glass Substances 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims 2
- 239000000377 silicon dioxide Substances 0.000 claims 2
- 238000001514 detection method Methods 0.000 claims 1
- 238000007689 inspection Methods 0.000 claims 1
- 238000005452 bending Methods 0.000 abstract description 7
- 230000035882 stress Effects 0.000 description 21
- 238000000034 method Methods 0.000 description 14
- 238000006073 displacement reaction Methods 0.000 description 8
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- 230000008901 benefit Effects 0.000 description 4
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- 229910000967 As alloy Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/243—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using means for applying force perpendicular to the fibre axis
- G01L1/245—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using means for applying force perpendicular to the fibre axis using microbending
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Optical Transform (AREA)
Abstract
A kind of little bending stress meter comprises two blocks of plates with corrugated surface relative, that stagger mutually, and a signal optical fibre that is clipped between the two boards.Be covered with coating on the optical fiber, send into light signal, read light signal with optical sensor at its other end by an end of optical fiber.The modulation of light is mainly derived from by plate gives the optical fiber applied pressure poor.Second optical fiber, reference optical fiber is being exposed near the signal optical fibre under the identical heat condition; With the light signal of reference optical fiber and the light signal that passed signal optical fibre relatively, the temperature error that can compensation temperature changes the light signal that is caused.Aluminium, polyimide or gold plating have improved the temperature resistant capability of optical fiber.
Description
In general, the present invention is relevant with taseometer, and is particularly relevant with a kind of novel useful microbend fiber optic strain gauge; This taseometer has used an optical fiber that is covered with coating, and optical fiber is fixed between two corrugated plates and is subjected to bending like this; Also used a reference optical fiber, reference optical fiber be exposed on the same thermal environment of last optical fiber in, but be not fixed between two corrugated plates.
Developed many kinds of taseometers, be used for the measurement structure load, so that whether checking separate part or overall construction design get proper.Existing taseometer comprises paper tinsel, film or line resistance device, and these devices are glued or are welded on the sample.Be added in load on the sample can make sample and be bonded at that taseometer on the sample is subjected to stretching, compression or distortion.The stress that produces on taseometer changes its resistance.If with the arm of taseometer resistance as Winston's electric bridge, then electric bridge can become uneven, and the voltage that is produced will be proportional to the stress intensity that induces on taseometer.This method is the taseometer based measurement of using at present.
But, when needs at high temperature carry out stress measurement, can meet difficulty.For example, the thermal expansion of taseometer and sample is different, makes taseometer be subjected to stress; This stress sizable range of having used up, thus covered need to measure by the caused stress of load.Further, carry out accurately and reliably measuring, the serviceability temperature of resistance taseometer generally all is limited in below about 315 ℃ (about 600 °F).Surpass this temperature, the effect of physics and metallography as alloy decomposition, phase transformation, selective oxidation and diffusion, with making the output generation of taseometer that very big nonrepeatability, uncertain variation be arranged, often makes taseometer or lead system malfunctioning too early.
At present, surpass 315 ℃ accurate and reliable stress measurement, also do not have a kind of method of satisfaction for temperature.Need a kind of reliable, stable taseometer, it can be worked under this high temperature; And the thermal expansion with sample is complementary, so that when low temperature, just taseometer can be bonded on the sample.
At the measurement structure bar, as long fulcrum bar, elongation the time, also can run into the similar difficulty that runs into when measuring stress.Under relatively mild condition, as producing free vibration, elongation may change in time lentamente.It can be the measurement of direct current basically that this situation requires elongate sensor.Therefore, the drift of sensor must be very little.
When structure bar is placed in mal-condition following time, situation is just more complicated.
In high performance aircraft, in order to improve fuel efficiency, engine performance and overall reliability need to monitor the device of engine intake, export situation awing.This device must can bear abominable engine condition, comprising hot operation condition and vibration.Optical fiber and light method for sensing have been applied to the measurement under many rugged surroundings, comprising displacement, and speed, stress, flow, temperature, size-grade distribution, gas ingredients and generation.These light method for sensing also can be used to gaging pressure under mal-condition.
Also can design optical sensor, it can be worked in high temperature or strong-electromagnetic field.
The invention describes a taseometer; Taseometer uses a pair of corrugated plate; Ripple is arranged on the corrugated plate, staggered relatively, mutually across a certain distance; An optical fiber that is covered with coating is sandwiched in the above-mentioned relative corrugated surface, and by the ripple bending, degree of crook depends on the size of two boards being pushed to additional force together; Therefore, the pressure that two boards is suffered is depended in the modulation that the light by optical fiber is subjected to.
One aspect of the present invention is, part as taseometer, comprise an additional optical fiber, its structure and above-mentioned first optical fiber identical, but be not sandwiched in the two boards, second optical fiber and first optical fiber close proximity make them be exposed under the identical temperature conditions like this; By the light that passed and be subjected to its modulation in second optical fiber,, be used to produce a hot mechanical deflection modified value with by the light that passed and be subjected to its modulation in first optical fiber.
By on glass optical fiber, being covered with aluminium or polyimide coating, can obtain the taseometer that can under (about 800) condition, use up to about 427 ℃.By be covered with gold plating on glass optical fiber, the serviceability temperature scope can expand to about 540 ℃ (about 1000 °F).
Another aspect of the present invention has provided a kind of simplicity of design, firm in structure, the taseometer of making economy and anti-adverse environment.
Various unique features of the present invention is pointed out particularly in the claims; Claim is attached to after this paper and constitutes the part of this paper.For a better understanding of the present invention, its service advantages and special applications result, accompanying drawing is illustrated, and is described in conjunction with preferred embodiment.
In the accompanying drawings:
Fig. 1 is the side cross-sectional view of the simple form of taseometer among the present invention.
Fig. 2 is a block scheme, the taseometer among the present invention of expression use signal optical fibre and reference optical fiber.
Fig. 3 is that load is with the variation of fiber optics displacement among the present invention, and optical fiber has two curvature of space.
Fig. 4 is the variation of taseometer output voltage with the displacement of plate in the taseometer.
Fig. 5 is the calibration figure of the little bending stress meter of the present invention with respect to a Reference Stress meter.
Fig. 6 is a side cross-sectional view, and expression is arranged in the taseometer of the present invention of the slit of stress sample to be measured.
Fig. 1 microbend fiber optic strain gauge that drawn.Use therein glass glass optical fiber 10 has following parameters:
Cladding diameter 170 μ m
Numerical aperture 0.2
Buffer coat thickness is aluminium or the polyimide of 40 μ m
Overall diameter 250 μ m
Wherein, 1 μ m=10
6Rice
Optical fiber with above-mentioned coating is solid, firm, tensile strength is more than 100,000 pounds/square inch.Microbend sensor is a kind of light intensity sensor; Therefore, use very simple photoelectric device.Taseometer is made up of above-mentioned optical fiber 10, and optical fiber is sandwiched between corrugated plate 12 and 14, and the manufacturing materials of corrugated plate is identical with the material of sample.The variation of sample stress has changed the spacing of plate, thereby has changed the light intensity of sending at bite.Ripple is about 3mm at interval.Two ripples 15 are arranged on the plate 12, and the plate that another piece is relative with it has three ripples 18; Make optical fiber 10 that two space sinus-curve be arranged.Optical fiber by prestrain (additonal pressure), makes the peak-to-peak amplitude of fibre-optical bending be about 300 μ m in two boards.In this structure, the sensitivity of microbend sensor and repeatability can reach 0.006 μ m.Under this prestrain, the corrugated plate displacement is very approaching linear with the variation of load, as shown in Figure 3.Should also be noted that as seen from Figure 4 the linear relationship of the output signal of microbend sensor and corrugated plate displacement.
Shown in Figure 5 is the performance data that must obtain at microbend fiber optic strain gauge.Little bending stress meter is calibrated with respect to the Reference Stress meter.
Can use several distinct methods, with the two boards 12 of microbend sensor and 14 and sample link together.Comprise in these methods two ends 21 and 22 are welded in or are bonded on the sample.The less method of a kind of destructiveness is arranged, on the sample surface, open a slit, in the plate insertion groove.Among Fig. 6, slotted 26 on the sample 20, in groove, put into plate 12 and 14.Two boards is pushed to together by their back side 23 and 24.When selecting method of attachment, should make the architectural characteristic and static, the dynamic response change minimum of sample.
Once quickened the dynamic life time test with microbend sensor, and recorded the life-span more than 1,000,000 times, peak displacement is 25 μ m.These tests are carried out with the frequency of 20kHz, and this has also shown the high frequency response ability of microbend sensor.
Microbend sensor uses cheap normal optical electrical part, comprising light emitting diode (LED), gets the bid at Fig. 2 and to do 30 and silicon photodetector 40.Use the pulsed modulation light emitting diode, and the signal of photo-detector is detected and amplify with the CMOS integrated circuit, the average electrical power consumption of each sensor can be less than 12 milliwatts.
Description and shown in Figure 1 as mentioned, microbend sensor can be realized prestrain by the additional displacement of two boards, thereby makes ripple 16 and 18 interlaced with each other; Alternating quantity should be more than or equal to fibre diameter, or greater than the maximum elongation of being expected.When plate is heated, can calculate the ripple peak separation with variation of temperature.In addition, prove easily also that concerning every block of plate, the ripple peak-peak can be ignored to the influence of sensor output signal with variation of temperature at interval.In practice, wish that little curved corrugated plate well aligns, make the ripple peak position within needed+13 μ m prestrain displacements.In this case, since the most serious numerical value of thermal elongation (Δ L) τ that site error produces be:
（ΔL）τ＝LαΔT
Substitution numerical value, Δ T are 400 ℃ of desired operating temperature ranges, and α is 8.5 * 10 for typical titanium alloy
-6/ ℃, L is site error 13 μ m, thereby obtain the thermal elongation error is
（ΔL）＝（13）（8.5×10
-6）（400）＝
＝0.04μm
Like this, be the taseometer of 1cm for length, the hot error of generation is (4 μ) stress, wherein, 1 μ stress=1 μ m/m.
Except above-mentioned compensation, also to compensate the light transmission of optical fiber and the variation of the intensity of light source and the drift of photo-detector output sensitivity to a hot mechanical deflection.The present invention uses method shown in Figure 2 successfully to compensate these variations.As shown in Figure 2, second optical fiber 11(reference optical fiber) and signal optical fibre 10 parallel placements, signal optical fibre 10 is sandwiched in the middle of two corrugated plates (not drawing in Fig. 2).Reference optical fiber 11 is not sandwiched between the plate, but is bearing the thermal environment identical with signal optical fibre along its length direction.
A major advantage of the present invention is, little bending stress meter make plate 12 and 14 and the thermal expansivity of tested backing material can obtain coupling.This point is at common taseometer, as the resistance taseometer, in do not accomplish that this advantage has following effect: 1) enlarged temperature range, 2) reduced the thermal output of taseometer.
It shown in Fig. 3～5 test data that corrosion resistant plate obtains.In general, answer the option board material, make it thermal expansivity can with the matched coefficients of thermal expansion of backing material.Another kind method is, if known principal direction of stress can begin not match with regard to the thermal expansivity that makes plate and substrate, that is to say, under the prerequisite of the same sensitivity of maintenance, is biased mutually, thereby increases the taseometer range.
Also available melten glass of plate 12 and 14 or stupalith are similarly made, increasing the opposing thermal effect, as the ability of heat ageing, thermal expansion and the thermal pinch of plate.
The advantage of microbend fiber optic strain gauge of the present invention can be summed up as following some:
Be higher than in temperature under the condition of 427 ℃ (800) and work;
In light weight, compact conformation does not have outshot, and is when particularly ripple microbend sensor plate being put into the slit of structure bar, all the more so;
In the accuracy that can reach 0.05 μ m by direct current in the frequency range of 20kHz;
Can use machinery and electronic method that microbend sensor is carried out temperature compensation; Can also drift about with the electronic signal process eliminates;
Go for compound and metal material, this manufactures ripple microbend sensor plate by employing and structured material or sample identical materials and realizes;
Ability with anti-electromagnetic interference (EMI) and electromagnetic pulse;
Because sensor leans on the work of nonpolarized light energy, do not exist spark to harm problem, the sensor that is installed in the distant place can be placed under the environment of blast impairment;
The glass optical fiber material of inertia is anticorrosive.
Replace being covered with the glass optical fiber of aluminium or polyimide coating with the silica glass optical fiber that is covered with gold plating, can make usable range of the present invention be increased to about 540 ℃ (about 1000 °F).Signal optical fibre 10 and reference optical fiber 11 can be manufactured like this.According to the present invention and have the long-term measurement that above-mentioned durothermic taseometer can be used for the contrary crack of boiler backheat or main steam pipe stress.
The scene of above-mentioned taseometer is installed and should be adopted the capacitor discharge spot welding method to carry out, and so only needs local scale removal to prepare as the surface with grinding.As on pipe is contrary, taseometer of the present invention being installed, only need to remove heat insulation layer usually with the pressure gauge corresponding region.Can be with the plug of heat insulation layer, (diameter is two to three inch) unloaded, the taseometer of packing into, and then load onto plug again.By drawing the light lead-in wire, be connected with the stress reading device with external fiber.
Get back to Fig. 2 now, signal optical fibre 10 all passes through known optical fiber soldering tip 42 with reference optical fiber 11 and is connected with fiber coupler 44.
Light by light emitting diode 30 outputs is divided into two parts by three-dB coupler 44, and this two parts light is coupled in signal optical fibre 10 and the reference optical fiber 11 by optical fiber soldering tip 42.Then, this two root multimode fiber is sent their output signal into two-way photo-detector 40 and its attached output circuit 46.Signal A and B are digitized, and are formed the compensation sensor signal of (A-B)/(A+B) form by change-over circuit 46 conversions.
Should be understood that only pipe above describes and described several specific embodiments in detail for application principle of the present invention is described, the present invention can also implement with other method, and principle still according to the invention.
Claims (9)
1, a kind of taseometer comprises a pair of plate with relative corrugated surface, and ripple on plate and the ripple on another piece plate stagger mutually; An optical fiber that is covered with coating is sandwiched between above-mentioned two corrugated plates, and the degree that optical fiber is bent depends on and add onboard, makes the size of the pressure that two boards lumps together; End at optical fiber is equipped with optical signal transmitter, and light signal is sent in the above-mentioned optical fiber; The other end at optical fiber is equipped with signal inspection device, with light signal and be added on the light signal, with above-mentioned plate on the corresponding modulation of pressure read; There is one to be the signal optical fibre that transmission signals is used in the above-mentioned optical fiber.
2, in the taseometer described in the claim 1, be covered with a kind of coating among aluminium, polyimide or three kinds of materials of gold on the optical fiber.
3, in the taseometer described in the claim 1, the material of fiber cores is by selecting in the material component that comprises glass and silicon dioxide.
4, in the taseometer described in the claim 1, comprise a reference optical fiber, it is connected between above-mentioned light sending device and the above-mentioned light detection device, wherein one section be positioned at above-mentioned plate near, be in the identical heat condition with the sweep that is clipped in the signal optical fibre between two plates.
5, in the described taseometer of claim 4, described optical signal transmitter comprises a light source and a fiber coupler, and fiber coupler will be divided into two equal light signals by the light that light source sends, and sends into above-mentioned signal optical fibre and above-mentioned reference optical fiber.
6, in the described taseometer of claim 5, signal and reference optical fiber have core and the covering and the aluminum coating of glass.
7, in the described taseometer of claim 5, signal and reference optical fiber have the core and the covering of glass, and polyimide coating.
8, in the described taseometer of claim 5, signal and reference optical fiber have the core of silicon dioxide, and gold plating.
9, in the described taseometer of claim 1, described plate is that employing is made with the material that any material of being tested by taseometer has identical temperature expansion coefficient.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US92496286A | 1986-10-30 | 1986-10-30 | |
| US924,962 | 1986-10-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN87107210A true CN87107210A (en) | 1988-08-03 |
| CN1016100B CN1016100B (en) | 1992-04-01 |
Family
ID=25450986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87107210 Expired CN1016100B (en) | 1986-10-30 | 1987-10-29 | Microbend fiber optic strain gauge |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS63117205A (en) |
| CN (1) | CN1016100B (en) |
| AU (1) | AU598858B2 (en) |
| CA (1) | CA1299389C (en) |
| GB (1) | GB2196735B (en) |
| IN (1) | IN167564B (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101881633A (en) * | 2010-04-06 | 2010-11-10 | 西安金和光学科技有限公司 | Spring type high-precision optical fiber sensor based on optical fiber bending loss |
| CN102221374A (en) * | 2010-04-19 | 2011-10-19 | 西安金和光学科技有限公司 | Fiber sensing device for sensing torque parameters |
| WO2012010099A1 (en) * | 2010-07-21 | 2012-01-26 | 西安金和光学科技有限公司 | Optic fiber cylinder sensor |
| CN102829901A (en) * | 2011-06-14 | 2012-12-19 | 西安金和光学科技有限公司 | Optical fiber sensing device waveform grooves and cylinder body |
| CN103604540A (en) * | 2013-11-13 | 2014-02-26 | 中铁四局集团第一工程有限公司 | Photoelectric stressometer |
| CN104359653A (en) * | 2014-10-23 | 2015-02-18 | 河海大学 | Optical fiber one- and two-way bending curvature double-channel tracking monitor and monitoring method |
| CN105606276A (en) * | 2015-12-24 | 2016-05-25 | 中北大学 | MEMS optical fiber micro-bend pressure sensor and preparation method thereof |
| CN106441661A (en) * | 2016-12-02 | 2017-02-22 | 西南交通大学 | Fiber grating force-measuring gasket and anchor rod force-measuring system |
| CN109620186A (en) * | 2019-01-30 | 2019-04-16 | 福州新易达光电科技有限公司 | A kind of optical fiber micro-bending sensor for monitoring human vital sign parameter |
| CN110234967A (en) * | 2017-02-02 | 2019-09-13 | 株式会社藤仓 | The manufacturing method of photodetector and photodetector |
| CN111707206A (en) * | 2020-06-04 | 2020-09-25 | 哈尔滨工程大学 | Quantum dot optical fiber micro-bending sensor with position detection function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2650670A1 (en) * | 1989-08-02 | 1991-02-08 | Fiori Costantino | System for detecting a fire or any other phenomenon generating an abnormal rise or fall in temperature with respect to a fixed reference |
| US5039218A (en) * | 1990-03-28 | 1991-08-13 | Hughes Aircraft Company | Testing of optical fiber by introducing multiple simulated peel location bends |
| GB2250813A (en) * | 1990-12-15 | 1992-06-17 | British Aerospace | Weighing apparatus for vehicles |
| JP3410101B2 (en) | 1994-11-29 | 2003-05-26 | ユナイテッド テクノロジーズ コーポレイション | Coating annihilation detection by optical fiber Bragg grating |
| DK1709416T3 (en) | 2004-01-23 | 2018-06-18 | Lm Wind Power Int Tech Ii Aps | Device comprising a system adapted for use in temperature compensation for load measurements in fiber-reinforced structures |
| CN1300571C (en) * | 2004-08-24 | 2007-02-14 | 西安科技大学 | Snake type fiber-optical sensor burying and detecting method and its snake type fibre-optical sensor |
| EP2962080B1 (en) * | 2013-02-28 | 2021-05-19 | Osmos Group | Optical measurement device having a reference channel and a measurement channel, and related method |
| GB2586974B (en) * | 2019-09-06 | 2022-12-28 | Nuron Ltd | System for producing strain in a fibre |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0027540A3 (en) * | 1979-09-11 | 1981-10-07 | Hydroacoustics Inc. | Optical sensor and transducer array system |
| US4436995A (en) * | 1981-06-29 | 1984-03-13 | General Electric Company | Fiber optics transducers for sensing parameter magnitude |
| GB2125161A (en) * | 1982-07-21 | 1984-02-29 | Gen Electric Co Plc | Optical fibre sensors |
| JPS5946805A (en) * | 1982-09-11 | 1984-03-16 | Diesel Kiki Co Ltd | Displacement detector |
| IN165010B (en) * | 1986-02-03 | 1989-07-29 | Babcock & Wilcox Co | |
| AU579041B2 (en) * | 1986-05-09 | 1988-11-10 | Thomas & Betts Corporation | Method of and apparatus for fiber optic sensing |
| GB8704540D0 (en) * | 1987-02-26 | 1987-04-01 | Bicc Plc | Optical sensors |
-
1987
- 1987-08-17 IN IN645/CAL/87A patent/IN167564B/en unknown
- 1987-08-17 GB GB8719390A patent/GB2196735B/en not_active Expired - Fee Related
- 1987-08-17 CA CA000544687A patent/CA1299389C/en not_active Expired - Fee Related
- 1987-09-23 AU AU78894/87A patent/AU598858B2/en not_active Ceased
- 1987-10-29 JP JP27198387A patent/JPS63117205A/en active Pending
- 1987-10-29 CN CN 87107210 patent/CN1016100B/en not_active Expired
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101881633A (en) * | 2010-04-06 | 2010-11-10 | 西安金和光学科技有限公司 | Spring type high-precision optical fiber sensor based on optical fiber bending loss |
| WO2011124126A1 (en) | 2010-04-06 | 2011-10-13 | 西安金和光学科技有限公司 | Fiber optic sensor based on spiral structure |
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| CN110234967A (en) * | 2017-02-02 | 2019-09-13 | 株式会社藤仓 | The manufacturing method of photodetector and photodetector |
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Also Published As
| Publication number | Publication date |
|---|---|
| GB2196735A (en) | 1988-05-05 |
| AU7889487A (en) | 1988-05-05 |
| GB8719390D0 (en) | 1987-09-23 |
| AU598858B2 (en) | 1990-07-05 |
| CA1299389C (en) | 1992-04-28 |
| IN167564B (en) | 1990-11-17 |
| GB2196735B (en) | 1991-01-23 |
| JPS63117205A (en) | 1988-05-21 |
| CN1016100B (en) | 1992-04-01 |
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