CN1176390C - Palladium film hydrogen sensing device based fibre-optical grating temperature non-responsiveness - Google Patents
Palladium film hydrogen sensing device based fibre-optical grating temperature non-responsiveness Download PDFInfo
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- CN1176390C CN1176390C CNB031167462A CN03116746A CN1176390C CN 1176390 C CN1176390 C CN 1176390C CN B031167462 A CNB031167462 A CN B031167462A CN 03116746 A CN03116746 A CN 03116746A CN 1176390 C CN1176390 C CN 1176390C
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- optical fiber
- fiber grating
- film
- hydrogen
- insensitive
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- 239000001257 hydrogen Substances 0.000 title claims abstract description 33
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 33
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 title claims description 31
- 229910052763 palladium Inorganic materials 0.000 title claims description 6
- 125000004435 hydrogen atom Chemical class [H]* 0.000 title claims description 5
- 230000004043 responsiveness Effects 0.000 title 1
- 239000013307 optical fiber Substances 0.000 claims abstract description 21
- 239000002184 metal Substances 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000000835 fiber Substances 0.000 claims description 24
- 230000035945 sensitivity Effects 0.000 claims description 9
- 150000002431 hydrogen Chemical class 0.000 abstract description 18
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 11
- 238000012360 testing method Methods 0.000 abstract description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012812 general test Methods 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Investigating Or Analysing Materials By Optical Means (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The present invention discloses an optical fiber grating based Pd film hydrogen sensing device insensitive to temperature. The present invention comprises two V-shaped brackets which are connected by a middle hinge to form a V-shaped tong type structure. An optical fiber plated by a Pd film sensitive to hydrogen is pasted between two side arms of one end of the two V-shaped brackets, and both ends of a metal wire are respectively connected and fixed to adjusting screws of two side arms of the other end of the V-shaped brackets. The length and the position of the metal wire are adjusted by the lever principle of the two V-shaped brackets connected by the hinge so as to make the variation of the stress accepted by the optical fiber grating reach to an appropriate valve. Consequently, the appropriate valve compensates for the shift of the Bragg wavelength lambdaB of the optical fiber grating, which is caused by the temperature. The optical fiber grating based Pd film hydrogen sensing device is insensitive to the variation of the ambient temperature. A test system has the advantages of reliable performance, strong anti-interference performance and high precision. The present invention can exactly detect the hydrogen concentration in relatively rugged environment. Generally, the test precision can reach to 0.05%.
Description
Technical field
The present invention relates to a kind of based on the insensitive palladium film hydrogen sensor of optical fiber grating temperature.
Background technology
In the hydrogen sensitive technology, generally adopt palladium (Pd) to make catalytic specie, work as H
2Gas runs at first to be adsorbed then behind the Pd film and is absorbed, and this catalytic reaction is reversible.The Pd film of inhaling behind the hydrogen has two kinds of solid solution to exist usually, show as α mutually with β mutually, it is relevant with surperficial environment temperature with the concentration of hydrogen that α arrives the conversion of β phase mutually.Out of phase lattice parameter differs greatly, and absorption repeatedly and desorption can cause the dislocation of metal lattice, causes the Pd film to stand all after dates of several hydrogen sucting discharging hydrogens and just can twist down to damaged, so thereby must the compensate for ambient Temperature Influence slow down the transformation that α arrives the β phase mutually.At present, be to plate one or more layers Pd film at fiber end face to make it to constitute the lenticule method using maximum aspect the research of optical fiber hydrogen sensor; Use Pd film and non-crystal WO in addition
3Making the hydrogen catalyzer also is one of early stage scheme, promptly except fiber end face plating Pd film, plates one deck WO again
3Film, because this sensor can produce strong absorption to the light wave of 800nm, so this method has very high sensitivity to the sensitivity of hydrogen, but that unique deficiency is a response speed is slow; In recent years, about having report at the hydrogen sensor of optical fiber surface generation plasma resonance wave structure and the hydrogen sensor of evanescent wave (Evanescent) structure, these methods all have in various degree raising to the sensitivity of hydrogen sensitivity, but measuring accuracy generally is difficult to reach 0.1%.Therefore require than higher occasion at measuring accuracy, be higher than 0.05% occasion as the responsive precision of hydrogen, fiber grating is the scheme of our first-selection.When ultraviolet ray irradiation light-sensitive optical fibre can make its refractive index generation permanent change, according to this effect fibre core is periodically exposed, thereby obtain fiber grating.Fiber grating has that the reflection bandwidth scope is big, added losses are little, device miniatureization, be coupled with optical fiber, with a series of excellent properties such as other optical fibre devices are compatible and be not subjected to that environment dust influences.
Use the quick sensing principle of bragg grating (FBG) formation hydrogen to be: sputter Pd film on fiber grating, H
2Be adsorbed very soon also and then absorption generation PdHx after meeting the Pd film, volume can produce contraction or expansion with the variation of density of hydrogen behind the generation PdHx, and the Pd membrane volume expands or contraction can cause the grating cyclomorphosis, causes bragg wavelengths
BChange.Temperature variation causes that the variation of grating cycle equally also can change bragg wavelengths in addition
B, therefore need make fiber grating insensitive to variation of ambient temperature.
Summary of the invention
In order to improve the sensitivity of hydrogen, reduce the influence of external environment to test macro, the purpose of this invention is to provide a kind of based on the insensitive Pd film of optical fiber grating temperature hydrogen sensor.
The technical solution adopted in the present invention is to achieve the above object of the invention: it comprises two V-type supports, be connected to form V shape forceps type structure by middle hinge, to be coated with and the fiber grating of the Pd film of hydrogen sensitivity is bonded between the two side arms of two V-type support one ends, the two ends of an one metal wire are contained in respectively that adjustment screw on the two side arms with the V-type support other end is connected and are fixing.
The beneficial effect that the present invention has is: be coated with the Pd film with the hydrogen sensitivity on a fiber grating, constitute the hydrogen sensitive sensor.Prop up by two V-types and to be configured to forceps type structure, tinsel has certain expansion coefficient, realizes insensitive to the variation of environment temperature thereby adjust prestress wiry by set screw.Because the tinsel thermal expansivity is bigger than optical fiber, its swell increment is also big than optical fiber, the lever principle of two V-type supports that dependence couples together by middle hinge, length and the position of regulating metal wire make the suffered STRESS VARIATION of fiber grating reach a suitable value, thereby have compensated the fiber grating bragg wavelengths that temperature causes
BDrift.It can make its variation to environment temperature insensitive, the test macro dependable performance, and strong interference immunity, precision height, it can accurately detect the concentration of hydrogen in relative rugged environment, and the general test precision can reach 0.05%.
Description of drawings
Fig. 1 is a hydrogen sensitive optical fibre optical grating construction synoptic diagram of the present invention;
Fig. 2 is a structural principle synoptic diagram of the present invention.
Among the figure: 1. fiber grating 2.Pd film 3.V type support 4.V type support 5. hinges
6. set screw 7. tinsels 8. are adjusted screw.
Embodiment
As shown in Figure 1, in the sensor fibre grating, make fiber grating 1 on optical fiber, be coated with Pd film 2 on fiber grating 1, the thickness of Pd film 2 is between 10nm-30nm.
As shown in Figure 2, it comprises two V-type supports 3,4 the present invention, be connected to form V shape forceps type structure by middle hinge 5, with be coated with and the fiber grating 1 usefulness epoxy resin bonding of the Pd film 2 of hydrogen sensitivity between the two side arms of two V-type support 3,4 one ends, the two ends of an one metal wire 7 are connected with adjustment screw 6,8 on the two side arms that is contained in V-type support 3,4 other ends respectively and are fixing.Two adjust screw all can vertically move (promptly adjusting lever arm length).Elder generation's set screw 6, the bragg wavelength that makes fiber grating 3 is λ B, this moment, density of hydrogen was zero, use epoxy resin bonding after mixing up. after raising when temperature, the cycle of the refractive index of fiber cores and fiber grating 1 all will become big, thereby the tuning wavelength of fiber grating 1 will move to the long wave direction, and tinsel 7 is because thermal expansivity is bigger than optical fiber, and its swell increment is also big than optical fiber.Two V-type supports 3 that dependence couples together by middle hinge 5 and 4 levers that form, make suffered suitable the diminishing of stress of fiber grating 3, thereby wave length shift (if the overcompensation or not enough that the temperature that has compensated fiber grating raises and causes, then but suitable adjustable screw rod 6 and 8 vertically moves simultaneously, i.e. the adjustment (adjusting) lever brachium; Regulate to a certain temperature variation insensitive after, then also insensitive to other temperature variation).Therefore has only H
2Concentration change can change bragg wavelengths
BMeasure bragg wavelengths
BThe drift size, then can measure the concentration of hydrogen.
Claims (2)
1. one kind based on the insensitive palladium film hydrogen sensor of optical fiber grating temperature, it is characterized in that: it comprises two V-type supports (3,4), be connected to form V shape forceps type structure by middle hinge (5), the fiber grating (1) that is coated with the Pd film (2) of hydrogen sensitivity is bonded in two V-type supports (3,4) between the two side arms of an end, the two ends of one one metal wire (7) respectively be contained in V-type support (3,4) the adjustment screw (6 on the two side arms of the other end, 8) connection and fixing realizes insensitive to the variation of environment temperature thereby adjust prestress wiry by set screw.
2. according to claim 1 a kind of based on the insensitive palladium film hydrogen sensor of optical fiber grating temperature, it is characterized in that: the thickness of said Pd film (2) is between 10nm-30nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031167462A CN1176390C (en) | 2003-04-28 | 2003-04-28 | Palladium film hydrogen sensing device based fibre-optical grating temperature non-responsiveness |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031167462A CN1176390C (en) | 2003-04-28 | 2003-04-28 | Palladium film hydrogen sensing device based fibre-optical grating temperature non-responsiveness |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1448740A CN1448740A (en) | 2003-10-15 |
| CN1176390C true CN1176390C (en) | 2004-11-17 |
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| CNB031167462A Expired - Fee Related CN1176390C (en) | 2003-04-28 | 2003-04-28 | Palladium film hydrogen sensing device based fibre-optical grating temperature non-responsiveness |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1904594B (en) * | 2006-08-10 | 2011-06-29 | 浙江大学 | Methane sensing device based on optical fiber Bragg grating pair and catalytic oxidation principle |
| CN100392454C (en) * | 2006-08-10 | 2008-06-04 | 浙江大学 | Method and apparatus for sensing methane concentration based on optical fiber Bragg raster |
| CN107076584B (en) | 2015-05-08 | 2020-11-24 | 辉固科技有限公司 | Optical sensor device, and cable |
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| CN1448740A (en) | 2003-10-15 |
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