CN102445224A - Spring type optical fiber sensing device for eliminating temperature influence - Google Patents
Spring type optical fiber sensing device for eliminating temperature influence Download PDFInfo
- Publication number
- CN102445224A CN102445224A CN2010105026052A CN201010502605A CN102445224A CN 102445224 A CN102445224 A CN 102445224A CN 2010105026052 A CN2010105026052 A CN 2010105026052A CN 201010502605 A CN201010502605 A CN 201010502605A CN 102445224 A CN102445224 A CN 102445224A
- Authority
- CN
- China
- Prior art keywords
- tooth
- spring
- internal layer
- layer shell
- distortion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses a spring type optical fiber sensing device for eliminating temperature influence, comprising curved test channel allowing a signal optical fiber to pass therethrough, a test unit connected with the signal optical fiber and a processing unit connected with the test unit, wherein the curved test channel comprises an outer housing, a spring, and a plurality of groups of lower deformable teeth and a plurality of groups of upper deformable teeth which are continuously distributed on the upper surface and the lower surface of the spring wire of the spring, respectively; the plurality of groups of lower deformable teeth and the plurality of groups of upper deformable teeth are distributed in a staggered manner and curved channel allowing one or a plurality of signal optical fiber to pass therethrough is formed between the head parts of the upper deformable teeth and the lower deformable teeth; and the outer housing comprises an outer-layer housing, and an inner-layer housing capable of producing telescopic deformation along with temperature changes with a deformation amount which can be offset with the deformation amount of the outer-layer housing. The spring type optical fiber sensing device for eliminating temperature influence is simple in structure, rational in design, convenient to process and fabricate, low in cost, flexible in use manner, high in sensitivity and good in use effect; besides, the spring type optical fiber sensing device is capable of effectively eliminating or reducing the influence of temperatures on the measurement accuracy and has wide market application prospect.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, especially relate to a kind of spring type fibre-optical sensing device of subduing temperature effect.
Background technology
Except the sensor that is specifically designed to the probe temperature parameter, the influence of temperature parameter all is that sensor moves towards one of problem that practical application must consider, and the high more sensor of precision is paid attention to the influence of temperature parameter.Existing nowadays, the method for subduing sensor temperature influence is a lot, is broadly divided into two types: subdue Influence of Temperature and come the interference of compensation temperature from data processing from the structure of sensor.Wherein, the latter needs temperature sensor to compensate, if relatively poor that of the sensor consistance that is compensated just needs calibration compensation respectively, practical operation is got up pretty troublesome; And the former need suit and exquisite structure compensation, thereby makes and be tending towards complicated on the sensor construction, but simpler when follow-up data is handled.To sum up, above-mentioned two kinds of methods of subduing sensor temperature influence are each has something to recommend him, and number of applications is all arranged in actual use, select which kind of method main closely related with condition and the type of sensor used.
Fibre Optical Sensor has plurality of advantages with respect to traditional sensors; Wherein the precision height is one of its major advantage; Like the flat optical fiber micro-bending sensor of existing sawtooth; The precision of variable in distance is on 0.1 Nano grade between its detectable two gullet plates, and then unwanted expansion coefficient will certainly influence test result, thereby temperature compensation is exactly to need one of problem of emphasis consideration.As shown in Figure 1, in fiber-optic grating sensor, the bridge-type temperature compensation is one of a kind of typical common method, and it is α that substrate 22 all adopts expansion coefficient with substrate 33
2Material process, it is α that substrate 1 adopts expansion coefficient
1Material process; Substrate 22 is arranged side by side with substrate 33 and the two is fixed on the substrate 1 through fixed pivot 1 respectively; The two ends of fiber grating 9 are separately fixed on substrate 22 and the substrate 33 through fixed pivot 2 12; The length of fiber grating 9 is remained unchanged when temperature variation, then need satisfy formula α
1* L
1* Δ T-α
2* (L
2+ L
3) * Δ T=0 (1-1), L in the formula (1-1)
2And L
3Be respectively the length of substrate 22 and substrate 33, the temperature amount of Δ T for changing, L
1Length for substrate 1; Formula (1-1) is carried out simple transformation to be got: α
2=α
1* [L
1/ (L
2+ L
3)] (1-2), the expansion coefficient α of substrate 22 and substrate 33 then
2Expansion coefficient α with substrate 1
1When satisfying (1-2) formula, can subdue fiber grating 9 basically and receive Influence of Temperature.In the actual use, substrate 22 and substrate 33 also can be selected the material of different expansion coefficient for use, so just make formula (1-1) and (1-2) somewhat more complicated a bit, its temperature compensation principle is the same.
In conjunction with Fig. 2 and Fig. 4; Existing spring type fibre-optical sensing device is a kind of high-precision optical fiber sensing device based on bending loss of optical fiber; Its basic structure is: the many wound springs 4 that are made up of spring wire; On the upper surface of spring wire and lower surface, vertically be laid with a plurality of distortion teeth; The following distortion tooth 4-1 that is laid with on the upper surface of going up distortion tooth 4-2 and lower spring silk that is laid with on the lower surface of the upper spring silk in the two adjacent rings spring wire; Last distortion tooth 4-2 and the corresponding laying of following distortion tooth 4-1 interleaved and the two accompany signal optical fibre 6; The two ends of spring 4 receive stress F to make its end positions of time spent to change, and cause that the distance between the two adjacent rings spring wire changes in the spring 4, go up distortion tooth 4-2 and the position change between the distortion tooth 4-1 down thereby make in the two adjacent rings spring wire; The corresponding variable power that makes the bending curvature that is clipped in distortion tooth 4-2 and is out of shape the signal optical fibre 6 between the tooth 4-1 down change and cause the light signal of transmission in the signal optical fibre 6; Signal optical fibre 6 is connected with test cell 5 through extended fiber 8, and in the actual use, above-mentioned spring type fibre-optical sensing device has bigger influence to the measuring accuracy of testing non-temperature parameter when temperature variation.
Summary of the invention
Technical matters to be solved by this invention is to above-mentioned deficiency of the prior art; A kind of spring type fibre-optical sensing device of subduing temperature effect is provided; It is simple in structure, reasonable in design, processing and fabricating is convenient, cost is low and use-pattern is flexible, highly sensitive, result of use good; Can effectively eliminate or reduce the influence of temperature, have wide market application prospect measuring accuracy.
For solving the problems of the technologies described above; The technical scheme that the present invention adopts is: a kind of spring type fibre-optical sensing device of subduing temperature effect is characterized in that: comprise the shaped form TCH test channel that supplies signal optical fibre to pass, join with signal optical fibre and the optical signal power variable quantity in the signal optical fibre is carried out the test cell of synchronism detection and joins with test cell and the test result of test cell carried out the processing unit of analyzing and processing; Said shaped form TCH test channel comprises external shell, apply in the end and can deform under the effect of external carbuncle F and corresponding press-bending signal optical fibre and be vertically to the spring of laying and be laid in continuously respectively under many groups on upper surface and the lower surface of spring wire of spring and be out of shape tooth on the distortion tooth and many groups; Each group distortion tooth down includes a plurality of teeth of distortion down that are out of shape tooth down or lay side by side; Each group goes up the distortion tooth and includes a plurality of distortion teeth of going up of going up the distortion tooth or laying side by side; Many groups down distortion tooth and many groups go up that interleaved between the distortion tooth is laid and the head of the two between form the shaped form passage that supplies one or more signal optical fibres to pass, following distortion tooth and last distortion tooth correspondence are laid in both sides about the signal optical fibre; Said external shell comprises can be with the outer casing of temperature variation generation dilatation and the internal layer shell that can offset with the deflection of temperature variation generation dilatation and deflection and outer casing; Said internal layer shell comprises and is laid in outer casing inside up and down the last internal layer shell and the following internal layer shell of both sides respectively; Springs layout is installed between internal layer shell and the following internal layer shell in outer enclosure interior and its, and last internal layer shell is identical with the length of following internal layer shell.
Above-mentioned a kind of spring type fibre-optical sensing device of subduing temperature effect; It is characterized in that: said distortion tooth down and last distortion tooth are processed by the material that can maybe can absorb monitored target and corresponding generation dilatation with heat deformable material, magnetostriction materials, the electrostriction material of temperature variation generation dilatation, and said outer casing is provided with a plurality of bleeder vents.
Above-mentioned a kind of spring type fibre-optical sensing device of subduing temperature effect; It is characterized in that: the outside of said distortion tooth down and last distortion tooth is provided with one or more layers by the dilatation layer that the material that can maybe can absorb monitored target and corresponding generation dilatation with heat deformable material, magnetostriction materials, the electrostriction material of temperature variation generation dilatation is processed, and said outer casing is provided with a plurality of bleeder vents.
Above-mentioned a kind of spring type fibre-optical sensing device of subduing temperature effect is characterized in that: the outer setting of said signal optical fibre has one or more layers dilatation layer of being processed by the material that can maybe can absorb monitored target and corresponding generation dilatation with heat deformable material, magnetostriction materials, the electrostriction material of temperature variation generation dilatation.
Above-mentioned a kind of spring type fibre-optical sensing device of subduing temperature effect is characterized in that: said shaped form TCH test channel ectomesoderm housing, go up internal layer shell, down internal layer shell, spring, down be out of shape tooth, on be out of shape tooth and signal optical fibre expansion coefficient satisfy formula:
α
Outward* L
Outward* Δ T-α
In* (L
In 1+ L
In 2) * Δ T-α
Silk* H
Silk* M * Δ T-α
Tooth* (L
1 tooth+ L
2 teeth) * N * Δ T-α
Fine* d
Fine* Δ T=0, α in the formula
OutwardBe the expansion coefficient of outer casing material therefor, L
OutwardBe the length of outer casing, α
InBe the expansion coefficient of last internal layer shell and following internal layer shell material therefor, L
In 1And L
In 2Be respectively the length of internal layer shell and following internal layer shell, α
SilkBe the expansion coefficient of spring material therefor, H
SilkBe the thickness of spring medi-spring silk, M is the number of plies of spring medi-spring silk, α
ToothFor being out of shape the expansion coefficient of tooth and last distortion tooth material therefor, L down
1 toothAnd L
2 teethBe respectively down the height of distortion tooth and last distortion tooth, N is for being out of shape the number of plies of tooth and last distortion tooth, α down
FineBe the expansion coefficient of signal optical fibre material therefor, d
FineBe the diameter of signal optical fibre, Δ T is a temperature variation.
Above-mentioned a kind of spring type fibre-optical sensing device of subduing temperature effect, it is characterized in that: an end of said signal optical fibre is provided with light reflecting device.
Above-mentioned a kind of spring type fibre-optical sensing device of subduing temperature effect is characterized in that: said signal optical fibre is the outside optical fiber that is surrounded by the multilayer fibers protective seam.
Above-mentioned a kind of spring type fibre-optical sensing device of subduing temperature effect, it is characterized in that: said spring is a spiral spring.
Above-mentioned a kind of spring type fibre-optical sensing device of subduing temperature effect; It is characterized in that: organize in the said down distortion tooth under the two adjacent groups spacing between the distortion tooth more and increase gradually or reduce gradually, organize more and saidly go up in the distortion tooth on the two adjacent groups spacing between the distortion tooth and increase gradually or reduce gradually from said external shell one end to the other end from said external shell one end to the other end.
Above-mentioned a kind of spring type fibre-optical sensing device of subduing temperature effect; It is characterized in that: the both ends up and down of said spring are installed in respectively on substrate four and the substrate five; Substrate four and substrate five are fixedly mounted on internal layer shell and the following internal layer shell through the adjustment screw rod respectively, and adjust between screw rod and last internal layer shell and the following internal layer shell and all be connected with engage thread.
The present invention compared with prior art has the following advantages:
1, simple in structure, reasonable in design and processing and fabricating is convenient, the processing and fabricating cost is low.
2, use easy and simple to handle and measuring accuracy is high, can effectively reduce the influence of environment temperature to Fibre Optical Sensor, it is more convenient that this spring type fibre-optical sensing device is used, and cost is lower.
3, applied widely, subduing on the basis of temperature effect, can also realize monitoring multiple gases, liquid, magnetic field, the isoparametric variation of electric field, expanded the usable range of this fibre-optical sensing device.
4, economy and obvious social benefit, practical value is high, can make up sensor network cheaply, does not need near each sensor the variation that a temperature sensor comes compensation temperature to be set all, satisfies the needs of actual engineering.
In sum, the present invention is simple in structure, reasonable in design, processing and fabricating is convenient, cost is low and use-pattern is flexible, highly sensitive, result of use good, can effectively eliminate or reduce the influence of temperature to measuring accuracy, has wide market application prospect.
Through accompanying drawing and embodiment, technical scheme of the present invention is done further detailed description below.
Description of drawings
Fig. 1 is the structural representation of the fiber-optic grating sensor of existing band bridge-type temperature compensation.
Fig. 2 is the structural representation of existing spring type fibre-optical sensing device.
Fig. 3 is the structural representation of the present invention's first embodiment.
Fig. 4 is the inner structure synoptic diagram of spring type fibre-optical sensing device of the present invention.
Fig. 5 is the inner structure synoptic diagram of the present invention's second embodiment.
Fig. 6 is the inner structure synoptic diagram of the present invention's the 3rd embodiment.
Description of reference numerals:
1-substrate one; 2-substrate two; 3-substrate three;
The 4-spring; 4-1-is the distortion tooth down; The last distortion of 4-2-tooth;
The 5-test cell; The 6-signal optical fibre; The 7-processing unit;
The 8-extended fiber; The 9-fiber grating; 10-dilatation layer;
11-fixed pivot one; 12-fixed pivot two; 13-substrate four;
The 14-bleeder vent; 15-substrate five; 16-adjusts screw rod;
18-substrate five; 20-fixed pivot three; The 21-outer casing;
The last internal layer shell of 22-; Internal layer shell under the 23-.
Embodiment
Like Fig. 3, a kind of spring type fibre-optical sensing device of subduing temperature effect shown in Figure 4, comprise the shaped form TCH test channel that supplies signal optical fibre 6 to pass, join with signal optical fibre 6 and the optical signal power variable quantity in the signal optical fibre 6 is carried out the test cell 5 of synchronism detection and joins with test cell 5 and the test result of test cell 5 carried out the processing unit 7 of analyzing and processing.Said shaped form TCH test channel comprises external shell, apply in the end and can deform under the effect of external carbuncle F and corresponding press-bending signal optical fibre 6 and be vertically to the spring of laying 4 and be laid under many groups on upper surface and the lower surface of spring wire of spring 4 distortion tooth 4-2 on the distortion tooth 4-1 and many groups respectively continuously; Each group distortion tooth 4-1 down includes a plurality of tooth of distortion down 4-1 that are out of shape tooth 4-1 down or lay side by side; Each group goes up distortion tooth 4-2 and includes a plurality of distortion tooth 4-2 that go up that go up distortion tooth 4-2 or lay side by side; Many groups down distortion tooth 4-1 and many groups go up that interleaved between the distortion tooth 4-2 is laid and the head of the two between form the shaped form passage that supplies one or more signal optical fibres 6 to pass, following distortion tooth 4-1 and last distortion tooth 4-2 correspondence are laid in signal optical fibre about in the of 6 both sides.In the present embodiment; Each group distortion tooth 4-1 down includes a distortion tooth 4-1 down; And each group goes up distortion tooth 4-2 and includes one and go up distortion tooth 4-2, and correspondingly, many groups distortion tooth 4-1 and many groups down go up to form between the head of distortion tooth 4-2 and supply the shaped form passage that signal optical fibre 6 passes.Said signal optical fibre 6 specifically joins through extended fiber 1 and test cell 5, light source and the light power meter of said test cell 5 for joining with the end, front and back of signal optical fibre 6 respectively.
Said external shell comprises can be with the outer casing 21 and the internal layer shell that can offset with the deflection of temperature variation generation dilatation and deflection and outer casing 21 of temperature variation generation dilatation; Said internal layer shell comprises the last internal layer shell 22 and following internal layer shell 23 that is laid in outer casing 21 inner both sides up and down respectively, and spring 4 is laid in outer casing 21 inside and it is installed between internal layer shell 22 and the following internal layer shell 23.During actual processing and fabricating, be fixedly connected through fixed pivot 3 20 between outer casing 21 and the said internal layer shell.In the present embodiment, said spring 4 is a spiral spring.The both ends up and down of said spring 4 are installed in respectively on substrate 4 13 and the substrate 5 15; Substrate 4 13 is fixedly mounted on internal layer shell 22 and the following internal layer shell 23 through adjustment screw rod 16 respectively with substrate 5 15; And all be connected with engage thread between adjustment screw rod 16 and last internal layer shell 22 and the following internal layer shell 23, last internal layer shell 22 is identical with the length of following internal layer shell 23.
In the actual use; Under the effect of external carbuncle F; When the relative position at spring 4 two ends changes; Be laid under many groups on the spring 4 position that distortion tooth 4-1 and many groups go up between the distortion tooth 4-2 and also can correspondingly change, and under temperature effect, sections parallel to each other expands with temperature variation or the length of contraction is subdued each other between outer casing 21 and the said internal layer shell.
In the actual use; For realizing that sections parallel to each other between outer casing 21 and the said internal layer shell expands with temperature variation or the length of shrinking is subdued each other, then said shaped form TCH test channel ectomesoderm housing 21, go up internal layer shell 22, following internal layer shell 23, spring 4, down be out of shape tooth 4-1, on be out of shape tooth 4-2 and signal optical fibre 6 expansion coefficient satisfy formula:
α
Outward* L
Outward* Δ T-α
In* (L
In 1+ L
In 2) * Δ T-α
Silk* H
Silk* M * Δ T-α
Tooth* (L
1 tooth+ L
2 teeth) * N * Δ T-α
Fine* d
Fine* Δ T=0, α in the formula
OutwardBe the expansion coefficient of outer casing 21 material therefors, L
OutwardBe the length of outer casing 21, α
InBe the expansion coefficient of last internal layer shell 22 and following internal layer shell 23 material therefors, L
In 1And L
In 2Be respectively the length of internal layer shell 22 and following internal layer shell 23, α
SilkBe the expansion coefficient of spring 4 material therefors, H
SilkBe the thickness of spring 4 medi-spring silks, M is the number of plies of spring 4 medi-spring silks, α
ToothFor being out of shape the expansion coefficient of tooth 4-1 and last distortion tooth 4-2 material therefor, L down
1 toothAnd L
2 teethBe respectively down the height of distortion tooth 4-1 and last distortion tooth 4-2, N is for being out of shape the number of plies of tooth 4-1 and last distortion tooth 4-2, α down
FineBe the expansion coefficient of signal optical fibre 6 material therefors, d
FineBe the diameter of signal optical fibre 6, Δ T is a temperature variation.Can find out; When outer casing 21, go up internal layer shell 22, down internal layer shell 23, down be out of shape tooth 4-1, on be out of shape tooth 4-2 and signal optical fibre 6 expansion coefficient when satisfying above-mentioned formula; The present invention in certain range of temperature, be not acted upon by temperature changes or can be largely on subdue influence of temperature variation, promptly compensated the influence of variation of temperature to test result.In case of necessity, need consider that also substrate 5 15 and adjustment screw rod 16 are acted upon by temperature changes.Simultaneously, not under the very high situation in accuracy requirement to test result, also can remove the computational item of the expansion coefficient of parts such as spring wire, signal optical fibre 6 or distortion tooth, to reduce cost.In the present embodiment, said distortion tooth 4-1 down and last distortion tooth 4-2 are by processing with the heat deformable material of temperature variation generation dilatation.The outer setting of said signal optical fibre 6 has one or more layers by the dilatation layer 10 that can process with the heat deformable material of temperature variation generation dilatation.
Particularly: when removing the expansion coefficient computational item of fiber section, said shaped form TCH test channel ectomesoderm housing 21, go up internal layer shell 22, internal layer shell 23, spring 4, the expansion coefficient that is out of shape tooth 4-1 and goes up distortion tooth 4-2 down satisfy formula down:
α
Outward* L
Outward* Δ T-α
In* (L
In 1+ L
In 2) * Δ T-α
Silk* H
Silk* M * Δ T-α
Tooth* (L
1 tooth+ L
2 teeth) * N * Δ T=0; When removing the expansion coefficient computational item of fiber section and distortion toothed portion, said shaped form TCH test channel ectomesoderm housing 21, go up internal layer shell 22, the expansion coefficient of internal layer shell 23 and spring 4 satisfies formula down: α
Outward* L
Outward* Δ T-α
In* (L
In 1+ L
In 2) * Δ T-α
Silk* H
Silk* M * Δ T=0; When removing the expansion coefficient computational item of fiber section, distortion toothed portion and spring 4, said shaped form TCH test channel ectomesoderm housing 21, the expansion coefficient of going up internal layer shell 22 and following internal layer shell 23 satisfy formula: α
Outward* L
Outward* Δ T-α
In* (L
In 1+ L
In 2) * Δ T=0.
Like this; Basically subduing under the temperature effect situation; When under the effect of external physical quantity (being specially external carbuncle F), changing the spacing of spring 4; Just change a plurality of distortion tooth 4-1 down and a plurality of distance that goes up between the distortion tooth 4-2 that distribute along spring 4 simultaneously; The two ends of stretching or compression spring 4 also make spring 4 overall elongated or shortening; Just can make a plurality of distortion tooth 4-1 down of distributing along spring 4 simultaneously and a plurality ofly go up distortion tooth 4-2 reverse motions or relative motion, and corresponding make down distortion tooth 4-1 and go up distance between distortion tooth 4-2 widen or dwindle, thereby just can change be out of shape down tooth 4-1 and on be out of shape the bending radius of signal optical fibre 6 folded between tooth 4-2; Also promptly change the bending loss coefficient of signal optical fibre 6; Thereby changed the decay size of the light signals of transmission in the signal optical fibre 6, detected the variation of this optical signal power and this variation is passed to after processing unit 7 carries out analyzing and processing, just can obtain subduing the size that acts on the physical quantity on the spring 4 under the temperature effect condition through test cell 5.
In the actual use; The present invention can also adopt another kind of detection mode; The end positions that is spring 4 is constant; This is out of shape tooth 4-1 at present and last distortion tooth 4-2 processes by the material that magnetostriction materials, electrostriction material maybe can absorb monitored target and corresponding generation dilatation, and said outer casing 21 is provided with a plurality of bleeder vents 14.In addition; Also can be out of shape down tooth 4-1 with on the outside of distortion tooth 4-2 be provided with one or more layers and maybe can absorb the dilatation layer 10 that the material of monitored target and corresponding generation dilatation is processed by magnetostriction materials, electrostriction material, said outer casing 21 is provided with a plurality of bleeder vents 14 simultaneously.Simultaneously, the outer setting of said signal optical fibre 6 has one or more layers maybe can absorb the dilatation layer 10 that the material of monitored target and corresponding generation dilatation is processed by magnetostriction materials, electrostriction material.
Adopted when this moment, detection mode detected; Monitored physical quantity (is a monitoring target when the external world; Be specially magnetic signal, electric signal or can absorbed material etc.) variation cause down distortion tooth 4-1, on when being out of shape the volume generation dilatation of tooth 4-2 and signal optical fibre 6 or causing dilatation layer 10 that dilatations take place; The corresponding height of distortion tooth 4-1 and last distortion tooth 4-2 that makes down changes; And make down distortion tooth 4-1 and go up distance between distortion tooth 4-2 and widen or dwindle; Thereby just can change be out of shape down tooth 4-1 and on the bending radius of folded signal optical fibre 6 between distortion tooth 4-2, also promptly change the bending loss coefficient of signal optical fibre 6, thereby changed the decay size of the light signals of transmission in the signal optical fibre 6; Detect the variation of this optical signal power and this variation is passed to after processing unit 7 carries out analyzing and processing through test cell 5, just can obtain subduing the size of the monitored physical quantity under the temperature effect condition.
As when adopting the density of hydrogen in the detecting air of the present invention; Then said down distortion tooth 4-1 and last distortion tooth 4-2 process by the Metal Palladium or the palldium alloy material that can absorb hydrogen and corresponding generation dilatation, also can be out of shape down tooth 4-1 with on the outside of distortion tooth 4-2 all apply one or more layers by Metal Palladium that can absorb hydrogen and corresponding generation dilatation or the dilatation layer 10 that the palldium alloy material is processed.In the actual use; Hydrogen enters into its inside through the bleeder vent 14 that distributes on the outer casing 21; When density of hydrogen changes; Metal Palladium or palldium alloy absorbed hydrogen and along with the changeable volume of density of hydrogen becomes big or diminishes, thus cause distortion tooth 4-1 down and go up distance between distortion tooth 4-2 widening or dwindling, thus just can change the bending radius of the signal optical fibre 6 that accompanies at the two distortion between cog; Also promptly change the bending loss coefficient of signal optical fibre 6; Thereby changed the decay size of the light signals of transmission in the signal optical fibre 6, detected the variation of this optical signal power and this variation is passed to processing unit 7 through test cell 5 and carry out analyzing and processing, can obtain subduing under the temperature effect situation change in concentration amount of hydrogen in the air.
In like manner; Signal optical fibre 6 outside plating one or more layers during by Metal Palladium that can absorb hydrogen and corresponding generation dilatation or dilatation layer 10 that the palldium alloy material is processed; When density of hydrogen changes, causing the volume change of this dilatation layer 10; Also can obtain making the equal effect that a plurality of down distortion tooth 4-1 and a plurality of distances that go up between the distortion tooth 4-2 change that distributes on the spring 4, thereby reach the purpose of monitoring physical quantity.
In the present embodiment, an end of said signal optical fibre 6 is provided with light reflecting device.Said light reflecting device can be light reflection mirror or fiber grating etc.The effect of said light reflecting device is to make the light signal of signal optical fibre 6 internal transmission can twice sensing position through said shaped form TCH test channel, thereby measuring accuracy is doubled.
During actual processing and fabricating; Among the said distortion down of the many groups tooth 4-1 under the two adjacent groups spacing between the distortion tooth 4-1 increase gradually or reduce gradually from said external shell one end to the other end, organize more and saidly go up among the distortion tooth 4-2 on the two adjacent groups spacing between the distortion tooth 4-2 and increase gradually or reduce gradually from said external shell one end to the other end.The bending curvature that the said distortion down of many groups tooth 4-1 and many groups are said to go up tooth depth and the profile of tooth of distortion tooth 4-2 all increases gradually or reduces gradually from said external shell one end to the other end.In the present embodiment, said signal optical fibre 6 is for the outside optical fiber that is surrounded by the multilayer fibers protective seam, like tight tube fiber, carbon coated fiber, polyimide coated optical fiber etc.; Said signal optical fibre 6 also can be plastic optical fiber, thin footpath optical fiber (like bare fibre external diameter 60 or 80 micron fiber) or photonic crystal fiber.
As shown in Figure 5; In the present embodiment; Different with embodiment 1 is: each group distortion tooth 4-1 down includes lay side by side two distortion tooth 4-1 down, and each group goes up distortion tooth 4-2 and includes two of laying side by side and go up distortion tooth 4-2, correspondingly; Distortion tooth 4-1 and many groups go up to form between the head that is out of shape tooth 4-2 and supply two shaped form passages that signal optical fibre 6 passes under many groups, can monitor the purpose that two physical quantitys change simultaneously thereby reach.In the actual use, also can included quantity of being out of shape tooth 4-1 down among the distortion tooth 4-1 under each group be organized the quantity that goes up included upward distortion tooth 4-2 among the distortion tooth 4-2 with each adjust accordingly according to the actual monitoring needs.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
As shown in Figure 6; In the present embodiment; Different with embodiment 1 is: the outside of said distortion tooth 4-1 down and last distortion tooth 4-2 is coated with a dilatation layer 10; And this dilatation layer 10 is Metal Palladium or palladium alloy layer, is used for the variation of monitoring hydrogen concentration, after the volume of dilatation layer 10 changes along with the variation of density of hydrogen; The distance that makes the following distortion tooth 4-1 that is laid on the spring 4 and go up between distortion tooth 4-2 changes; Thereby just can change be out of shape down tooth 4-1 and on the bending radius of folded signal optical fibre 6 between distortion tooth 4-2, also promptly change the bending loss coefficient of signal optical fibre 6, thereby changed the decay size of the light signals of transmission in the signal optical fibre 6; Detect the variation of this optical signal power and this variation is passed to processing unit 7 through test cell 5 and carry out analyzing and processing, can obtain the variable quantity of density of hydrogen.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
Simultaneously, also can be out of shape down tooth 4-1 with on the outside plating of the distortion tooth 4-2 dilatation layer 10 more than two-layer or two-layer monitor.During like the two-layer dilatation of plating layer 10, and two dilatation layers 10 are respectively the deformation layer one and the deformation layer two that plays catalytic action that is used to monitor methane gas content.As when monitoring the methane gas content under the coal mine; Be out of shape down tooth 4-1 with on the surface of distortion tooth 4-2 all the labile polymer material layer of plating one deck volume (like tygon) as deformation layer one; And then on deformation layer one at vapor deposition one deck platinum film as deformation layer two; When in the air methane molecule being arranged; Methane diffuses into its inside through the bleeder vent on the outer casing 21 14; Oxidation heat liberation makes the polymer material layer expanded by heating of deformation layer one under the catalytic action of platinum film, thereby the distance that distortion tooth 4-1 and many groups are gone up between the distortion tooth 4-2 changes, thus just can change be out of shape down tooth 4-1 and on be out of shape the bending radius of the signal optical fibre 6 between the tooth 4-2; Also promptly change the bending loss coefficient of signal optical fibre 6; Thereby changed the decay size of the light signal of transmission in the signal optical fibre 6, detected the variation of this optical signal power and this variation is passed to processing unit 7 through test cell 5 and carry out analyzing and processing, can obtain the variable quantity of concentration of methane gas.
The above; It only is preferred embodiment of the present invention; Be not that the present invention is done any restriction, every technical spirit changes any simple modification, change and the equivalent structure that above embodiment did according to the present invention, all still belongs in the protection domain of technical scheme of the present invention.
Claims (10)
1. spring type fibre-optical sensing device of subduing temperature effect is characterized in that: comprise the shaped form TCH test channel that supplies signal optical fibre (6) to pass, join with signal optical fibre (6) and the optical signal power variable quantity in the signal optical fibre (6) is carried out the test cell (5) of synchronism detection and joins with test cell (5) and the test result of test cell (5) carried out the processing unit (7) of analyzing and processing; Said shaped form TCH test channel comprises external shell, apply in the end and can deform under the effect of external carbuncle F and corresponding press-bending signal optical fibre (6) and be vertically to the spring of laying (4) and be laid in continuously respectively and be out of shape tooth (4-1) under many groups on upper surface and the lower surface of spring wire of spring (4) and upward be out of shape tooth (4-2) with many groups; Each group distortion tooth (4-1) down includes a plurality of teeth (4-1) of distortion down that are out of shape tooth (4-1) down or lay side by side; Each group goes up distortion tooth (4-2) and includes a plurality of distortion teeth (4-2) of going up of going up distortion tooth (4-2) or laying side by side; Organize more and be out of shape tooth (4-1) down and organize the shaped form passage that upward the formation one or more signal optical fibres of confession (6) pass between interleaved laying and the head of the two between the distortion tooth (4-2) more, following distortion tooth (4-1) and last distortion tooth (4-2) correspondence are laid in signal optical fibre (6) both sides up and down; Said external shell comprises can be with the outer casing (21) of temperature variation generation dilatation and the internal layer shell that can offset with the deflection of temperature variation generation dilatation and deflection and outer casing (21); Said internal layer shell comprises and is laid in outer casing (21) the inner last internal layer shell (22) and the following internal layer shell (23) of both sides up and down respectively; Spring (4) is laid in outer casing (21) inside and it is installed between internal layer shell (22) and the following internal layer shell (23), and last internal layer shell (22) is identical with the length of following internal layer shell (23).
2. according to the described a kind of spring type fibre-optical sensing device of subduing temperature effect of claim 1; It is characterized in that: said distortion tooth (4-1) down and last distortion tooth (4-2) are processed by the material that can maybe can absorb monitored target and corresponding generation dilatation with heat deformable material, magnetostriction materials, the electrostriction material of temperature variation generation dilatation, and said outer casing (21) is provided with a plurality of bleeder vents (14).
3. according to the described a kind of spring type fibre-optical sensing device of subduing temperature effect of claim 1; It is characterized in that: the outside of said distortion tooth (4-1) down and last distortion tooth (4-2) is provided with one or more layers by the dilatation layer (10) that the material that can maybe can absorb monitored target and corresponding generation dilatation with heat deformable material, magnetostriction materials, the electrostriction material of temperature variation generation dilatation is processed, and said outer casing (21) is provided with a plurality of bleeder vents (14).
4. according to the described a kind of spring type fibre-optical sensing device of subduing temperature effect of claim 2, it is characterized in that: the outer setting of said signal optical fibre (6) has one or more layers dilatation layer of being processed by the material that can maybe can absorb monitored target and corresponding generation dilatation with heat deformable material, magnetostriction materials, the electrostriction material of temperature variation generation dilatation (10).
5. according to the described a kind of spring type fibre-optical sensing device of subduing temperature effect of each claim in the claim 1 to 4, it is characterized in that: said shaped form TCH test channel ectomesoderm housing (21), go up internal layer shell (22), down internal layer shell (23), spring (4), down be out of shape tooth (4-1), on be out of shape tooth (4-2) and signal optical fibre (6) expansion coefficient satisfy formula:
α
Outward* L
Outward* Δ T-α
In* (L
In 1+ L
In 2) * Δ T-α
Silk* H
Silk* M * Δ T-α
Tooth* (L
1 tooth+ L
2 teeth) * N * Δ T-α
Fine* d
Fine* Δ T=0, α in the formula
OutwardBe the expansion coefficient of outer casing (21) material therefor, L
OutwardBe the length of outer casing (21), α
InBe the expansion coefficient of last internal layer shell (22) and following internal layer shell (23) material therefor, L
In 1And L
In 2Be respectively the length of internal layer shell (22) and following internal layer shell (23), α
SilkBe the expansion coefficient of spring (4) material therefor, H
SilkBe the thickness of spring (4) medi-spring silk, M is the number of plies of spring (4) medi-spring silk, α
ToothFor being out of shape the expansion coefficient of tooth (4-1) and last distortion tooth (4-2) material therefor, L down
1 toothAnd L
2 teethBe respectively down the height of distortion tooth (4-1) and last distortion tooth (4-2), N is for being out of shape the number of plies of tooth (4-1) and last distortion tooth (4-2), α down
FineBe the expansion coefficient of signal optical fibre (6) material therefor, d
FineBe the diameter of signal optical fibre (6), Δ T is a temperature variation.
6. according to the described a kind of spring type fibre-optical sensing device of subduing temperature effect of each claim in the claim 1 to 4, it is characterized in that: an end of said signal optical fibre (6) is provided with light reflecting device.
7. according to the described a kind of spring type fibre-optical sensing device of subduing temperature effect of each claim in the claim 1 to 4, it is characterized in that: said signal optical fibre (6) is the outside optical fiber that is surrounded by the multilayer fibers protective seam.
8. according to the described a kind of spring type fibre-optical sensing device of subduing temperature effect of each claim in the claim 1 to 4, it is characterized in that: said spring (4) is a spiral spring.
9. according to the described a kind of spring type fibre-optical sensing device of subduing temperature effect of each claim in the claim 1 to 4; It is characterized in that: organize the spacing of being out of shape under the two adjacent groups in the said down distortion tooth (4-1) between the tooth (4-1) more and increase gradually or reduce gradually, organize the said spacing of being out of shape on the two adjacent groups in the distortion tooth (4-2) between the tooth (4-2) of going up more and increase gradually or reduce gradually from said external shell one end to the other end from said external shell one end to the other end.
10. according to the described a kind of spring type fibre-optical sensing device of subduing temperature effect of each claim in the claim 1 to 4; It is characterized in that: the both ends up and down of said spring (4) are installed in respectively on substrate four (13) and the substrate five (15); Substrate four (13) and substrate five (15) are fixedly mounted on internal layer shell (22) and the following internal layer shell (23) through adjustment screw rod (16) respectively, and adjust between screw rod (16) and last internal layer shell (22) and the following internal layer shell (23) and all be connected with engage thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105026052A CN102445224A (en) | 2010-10-11 | 2010-10-11 | Spring type optical fiber sensing device for eliminating temperature influence |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105026052A CN102445224A (en) | 2010-10-11 | 2010-10-11 | Spring type optical fiber sensing device for eliminating temperature influence |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102445224A true CN102445224A (en) | 2012-05-09 |
Family
ID=46007945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105026052A Pending CN102445224A (en) | 2010-10-11 | 2010-10-11 | Spring type optical fiber sensing device for eliminating temperature influence |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102445224A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112013885A (en) * | 2019-05-31 | 2020-12-01 | 波音公司 | Optical fiber sensor system |
-
2010
- 2010-10-11 CN CN2010105026052A patent/CN102445224A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112013885A (en) * | 2019-05-31 | 2020-12-01 | 波音公司 | Optical fiber sensor system |
| CN112013885B (en) * | 2019-05-31 | 2024-04-19 | 波音公司 | Optical fiber sensor system and method for transporting optical sensors |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201697734U (en) | Spring type high precision optical fiber sensor based on optical fiber bending loss | |
| CN101881633B (en) | Spring type high-precision optical fiber sensor based on optical fiber bending loss | |
| CN102305965B (en) | Sensing optical cable for synchronously monitoring temperature and pressure in oil well tubing in distribution mode | |
| CN104049298A (en) | Vibration sensitive optical fiber and manufacturing method thereof | |
| CN105974544A (en) | Sensing-communication composite optical cable | |
| CN107202545B (en) | Temperature self-compensating fiber grating strain sensor | |
| Tong et al. | Simultaneous measurement of RH and temperature based on FBG and balloon-like sensing structure with inner embedded up-tapered MZI | |
| CN112504306A (en) | Close-wound optical fiber type hypersensitive oil well sensing optical cable | |
| CN101922989A (en) | Fiber pressure sensing device based on C-shaped spring tube | |
| Liu et al. | Fiber-optic evanescent field humidity sensor based on a micro-capillary coated with graphene oxide | |
| CN201858981U (en) | Spring type fiber sensor for eliminating and reducing influence of temperature | |
| CN102374913A (en) | Universal pressure sensing device based on optical fiber microbending loss | |
| CN102445224A (en) | Spring type optical fiber sensing device for eliminating temperature influence | |
| JP2011107415A (en) | Heat-resistant optical fiber, measurement method by the same and distributed optical fiber temperature measurement system | |
| CN101922948A (en) | Multilayer high-precision optical fiber detector based on microbending loss | |
| CN109239876A (en) | A kind of weak optical fiber Bragg grating temperature sensing optical cable | |
| CN102466468A (en) | Device and method for measuring cylinder bending parameters based on optical fiber bending loss | |
| CN102445219A (en) | Cylindrical fiber sensing device capable of reducing temperature effects | |
| CN101900617A (en) | Optical fiber type non-invasive pipeline pressure sensor | |
| CN110780410A (en) | Sensitivity-enhanced soft light distributed acoustic wave sensing optical cable | |
| CN201858983U (en) | cylinder optical fiber sensing device capable of eliminating temperature influence | |
| CN101923057A (en) | BOTDR (Brillouin Optical Time-Domain Reflectometer) fiber optical corrosive sensor | |
| CN102374872A (en) | Optical fiber sensing device based on functional material | |
| CN208672179U (en) | A kind of fibre optic temperature sensor based on surface plasma body resonant vibration and strain compensation | |
| CN208902928U (en) | A kind of weak optical fiber Bragg grating temperature sensing optical cable |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120509 |