CN203643079U - Fiber bragg grating dynamic high pressure sensor - Google Patents
Fiber bragg grating dynamic high pressure sensor Download PDFInfo
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- CN203643079U CN203643079U CN201420013624.2U CN201420013624U CN203643079U CN 203643079 U CN203643079 U CN 203643079U CN 201420013624 U CN201420013624 U CN 201420013624U CN 203643079 U CN203643079 U CN 203643079U
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Abstract
The utility model discloses a fiber bragg grating dynamic high pressure sensor. The sensor comprises a membrane body, a support column, an optical fiber comprising an fiber bragg grating, an installation shell, an optical fiber sheath and a fixing joint. The membrane body is fixed to a front end of the installation shell and then a pressure-sensitive surface of the sensor is formed. The optical grating is pasted on an inner hole surface of the support column in parallel along an axial direction and the hole is filled with a filling glue. An upper end surface of the support column is tightly contacted with the membrane body. A conical contact surface is adopted between a lower end surface of the support column and the installation shell. The optical fiber which is in the optical fiber sheath is fixed to a lower end of the installation shell through the fixing joint. A core idea is that through compressive deformation of the support column, ambient pressure is converted into a strain change of the fiber bragg grating (FBG) and perception of the pressure is realized through measurement of the strain. The sensor structure is firm. The sensor possesses high temperature resistance performance, strong impact vibration resistance performance and is not influenced by electromagnetic interference. The sensor is especially suitable for being used in severe environments, such as explosion and the like. Simultaneously, manufacturing of the sensor is convenient and fast and cost is low.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, particularly relates to a kind of high pressure high frequency sound sensor based on fiber grating of wide range.
Background technology
In national economy and national defense construction field, the particularly explosive test aspect of war production and strategy and tactics weapon development, often need to measure high pressure, the high pressure especially test of dynamic high-pressure is one of important content of the association areas such as the height of weapons and ammunitions developments, aerospace vehicle transmitting, material antiknock and engineering protection test, blast working, new material is pressed into, material constitutive relation, therefore the extremely concern of countries in the world researcher is one of study hotspot for a long time always.
At present, high pressure is measured conventional method copper post manometry, piezoelectric transducer manometry, piezoresistive transducer manometry.Copper crusher is a kind of mechanical pick-up device, and it utilizes the plastic yield after material pressurized to carry out pressure measurement, and advantage is easy to use, simple to operate, and anti-electromagnetic interference capability is strong; Shortcoming is that precision is low, and low-response is not suitable for the test of explosion wave; The ultimate principle of piezoelectric pressure indicator is the piezoelectric effect based on sensing element, and great advantage is that piezoelectric sensing element is a kind of passive device, does not need the outer energy, is conducive to the shielding design of sensing element and the antijamming capability of raising sensor.However, there is the measurement occasion of strong electromagnetic at some, during as the large pressure survey in blast near region, piezoelectric sensor poor anti jamming capability, signal to noise ratio (S/N ratio) is not high, and measuring accuracy is low.Piezoresistive transducer is to utilize the variation of resistance sensing element of pressure resistance value under the effect of compressive stress to determine by measuring pressure.The material that can be used as pressure drag component mainly contains silicon, copper-manganese, calcium, lithium, bismuth, carbon, ytterbium etc.Silicon is the most frequently used pressure drag material, is used widely, but is limited to the characteristic of silicon materials by the pressure transducer of its manufacture, and it can not be used for high pressure force measurement.Copper-manganese is the pressure drag material that is used to the earliest measure static high pressure power and detonation wave pressure and material internal stress, but the piezoresistance coefficient of copper-manganese is very low, and under low-pressure, (in hundreds of MPa) resistance variations is insensitive.The advantage of utilizing ytterbium to make piezoresistive transducer is that sensitivity coefficient is high, the piezoresistance coefficient of ytterbium is about 30 times of copper-manganese, but ytterbium is a kind of rare earth element, chemical property is more active, oxidizable, after oxidation, affect the purity of ytterbium, and then affect its piezoresistance coefficient, therefore the performance index such as the processing of ytterbium piezoresistive transducer and repeatability are difficult to be guaranteed.
Fibre Optical Sensor is using light wave as information carrier, and the transmission medium using optical fiber as information, carries out sensing measurement to tested parameter.Fibre Optical Sensor is passive device, and electrical insulating property is good, and anti-electromagnetic interference (EMI) does not produce again electromagnetic interference (EMI) simultaneously, high voltage withstanding, corrosion-resistant, can not produce the unsafe factors such as spark, high temperature, electric leakage, safe and reliable under strong electromagnetic, the rugged surroundings such as inflammable and explosive, moist.In numerous Fibre Optical Sensors, fiber-optic grating sensor is the most ripe, most widely used at present a kind of Fibre Optical Sensor.Its basic sensing element is the optical fiber Bragg raster (FBG) of uniform period.Fiber grating is the photosensitivity of utilizing fiber optic materials, in fibre core, form space phase grating (a kind of periodically index distribution), its effect essence is wave filter or the catoptron that forms an arrowband in fibre core, only the light of specific wavelength is had to transmission or reflex.Therefore, fiber-optic grating sensor has been except having inherited the advantage of Fibre Optical Sensor, also have wavelength-modulated, linearity and good stability, easy to make, be easy to the features such as large-scale production, cost be low.But, what fiber grating can directly respond is the variation of strain and temperature, in the time that fiber grating is used as pressure transducer, because the pressure sensitivity of bare optical fibers and bare optical gratings is low, therefore must improve pressure sensitivity by different method for packing, the main several methods such as corrugated tube, semi-girder, bourdon tube, diaphragm, metal or alloy strain tube that adopt are realized pressure survey, and these methods all should not realize the pressure survey of high frequency sound.
Utility model content
The purpose of this utility model is to provide a kind of fiber grating dynamic high-pressure sensor, makes it have the features such as simple in structure, making is quick, cost is low, is particularly suitable for the pressure survey of wide range under rugged surroundings, high pressure, high frequency sound.
In order to realize above-mentioned technical purpose, the technical solution of the utility model is, described a kind of fiber grating dynamic high-pressure sensor, comprise membrane body, support column, containing the optical fiber of grating, holder housing, optical fiber jacket and fixture splice, membrane body is fixed on the pressure-sensitive face that forms sensor after holder housing front end, grating on optical fiber is parallel vertically to be sticked in the bore area of support column and in hole, is full of filling glue, the upper surface of support column and membrane body close contact, between the lower surface of support column and holder housing, adopt circular cone type surface of contact, the optical fiber that is inserted in optical fiber jacket is fixed on holder housing lower end by fixture splice.
Described raster center wavelength can be any wavelength of C-band, and optical grating reflection rate is greater than 90%.
Described optical fiber is single-mode fiber.
Described membrane body has a cavity, and the bottom of cavity directly contacts with support cylinder upper surface, and the outside surface of cavity is helicitic texture.
The outer setting of described holder housing is fluted, establishes and can place packing washer in groove.
Technique effect of the present utility model is, grating (FBG) sticks in support column inside surface, by the compressive deformation of support column, ambient pressure is changed to the strain variation that is converted to grating (FBG), realize the perception to pressure by the measurement to strain, make that sensor response is fast, range is large; Light wave is limited in optical fiber, and light path is not affected by other factors, and makes sensor antijamming capability strong, stable performance; Light wave injects and exports along same optical fiber, makes sensor as single-ended device, easy to connect when use; The membrane body of sensor and holder housing adopt stainless steel material to form through finishing, and adopt high temperature resistant, high-intensity gluing and be threaded, make firm, high temperature resistant, the resistance to thump vibration of sensor construction of producing, be very suitable for using under the rugged surroundings such as blast.The utility model is simple in structure, and easy to make quick, cost is low, can ensure measuring accuracy and reliability simultaneously.
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is cylindrical structural stress deformation schematic diagram.
In Fig. 1: 1, membrane body, 2, fill glue, 3, support column, 4, optical fiber, 5, packing washer, 6, holder housing, 7, optical fiber jacket, 8, fixture splice.
Embodiment
Referring to Fig. 1, the utility model, by membrane body 1, is filled glue 2, support column 3, and containing the optical fiber 4 of grating (FBG), packing washer 5, holder housing 6, optical fiber jacket 7, fixture splice 8 forms.After membrane body 1 is fixing with holder housing 6 front ends, form the pressure-sensitive face of sensor, grating (FBG) on optical fiber 4 is parallel vertically to be sticked in the bore area of support column 3 and in hole, is full of filling glue 2, the upper surface of support column 3 and membrane body 1 close contact, between the lower surface of support column 3 and holder housing 6, adopt circular cone type surface of contact, the optical fiber 4 that is inserted in optical fiber jacket 7 is fixed on holder housing 6 lower ends by fixture splice 8, and packing washer 5 is placed in the groove of holder housing 6 outsides.
The technological thought of this fiber grating dynamic high-pressure sensor is:
Because the fundamental physical quantity of optical fiber grating sensing is strain, therefore the thinking of this fiber bragg grating pressure sensor design is the variation that the variation of pressure is converted to strain, realizes the perception to pressure by the measurement to strain.As shown in Figure 2, cylindrical structural is under pressure on end face
after effect, compression deformation can occur,, in cylindrical longitudinal generation compressive strain, strain value is:
In formula
for right cylinder longitudinal strain;
for the pressure being subject on right cylinder end face;
for the elastic modulus of cylinder material.In the time that right cylinder is steel,
mPa, the compressive strain that the pressure of 100 MPa produces is about 476 μ ε.In general, the fiber bragg grating center wavelength amount of movement that 1 μ ε causes is about 1.2pm, and the fiber bragg grating center wavelength amount of movement that the pressure of 100 MPa causes is about 0.571nm.The variation of grating (FBG) centre wavelength can be recorded by fiber Bragg grating (FBG) demodulator, and then the variation of ambient pressure can be obtained according to the wavelength strain sensitivity of FBG and formula (1).Specific to the utility model, ambient pressure acts on membrane body 1, cause membrane body 1 to be out of shape, the support column 3 of extruding and its close contact, make support column 3 compressive deformations, and then grating (FBG) the center of deformation wavelength that causes pasting on it moves, by measuring the variation of grating (FBG) centre wavelength, can realize the measurement of ambient pressure according to the wavelength strain sensitivity of grating (FBG) and formula (1).The fiber bragg grating pressure sensor of making by the method, the pressure that can measure at present maximum 500MPa changes, and the transient response rise time is less than 10 μ s.
The utility model is announced the method for making of this fiber grating dynamic high-pressure sensor, and its processing technology step is as follows:
(a), according to design size and tolerance processing of films lamellar body 1, support column 3, holder housing 6 etc., wherein the length of the pressure-sensitive diaphragm thickness in membrane body 1 and diameter, support column 3 and diameter are determined according to the range size of sensor;
(b) process optical fiber 4 according to the length of support column 3, make the length of grating (FBG) suitable with the length of support column 3;
(c) axially stick in its bore area by what be parallel to support column 3 with the grating (FBG) of tail optical fiber (being optical fiber 4), grating (FBG) tail optical fiber stretches out from the conical lower end face of support column 3, another tail optical fiber end face of grating (FBG) is concordant with the upper surface of support column 3 and do coarse processing, to reduce the Fresnel reflection of end face as far as possible;
(d) in the hole of support column 3, be full of and fill glue 2, wipe the glue outside overfolw hole; After glue curing, divest the glue outside overfolw hole in solidification process with blade, ensure the smooth of support column 3 upper surfaces;
(e) optical fiber 4 is passed to holder housing 6 from top to bottom, pass from its lower surface, contact with the conical end face of holder housing 6 until pasted the conical lower end face of the support column 3 of grating (FBG);
(f) membrane body 1 external screw-thread is smeared after high strength structural adhesion, slowly screwed in holder housing 6 front ends, until the upper surface of the cavity of membrane body 1 bottom close contact support cylinder 3;
(g) optical fiber 4 is put to optical fiber jacket 7, the inside of holder housing 6 is goed deep in the upper end of optical fiber jacket 7, and coats certain high strength structural adhesion at this part of outside surface that optical fiber jacket 7 gos deep into holder housing 6 inside;
(h) by fixture splice 8 through optical fiber jacket 7, until when the lower surface of contact holder housing 6, coat appropriate high strength structural adhesion at the outer surface thread place of fixture splice 8, then screw in holder housing 6 bottoms, complete fixing to optical fiber jacket 7;
(i) after waiting for high-strength structure adhesive curing, completed the making of fiber grating dynamic high-pressure sensor.
It is pointed out that in the time that fixation of sensor is installed and just packing washer 5 need to be loaded onto, make this sensor both can be used for the measurement of fluid pressure, also can be used for the measurement of gaseous tension.
Although describe the utility model in detail with reference to above-described embodiment, should be appreciated that the utility model is not limited to the disclosed embodiments.
Claims (5)
1. a fiber grating dynamic high-pressure sensor, it is characterized in that: comprise membrane body, support column, optical fiber, holder housing, optical fiber jacket and fixture splice containing grating, membrane body is fixed on the pressure-sensitive face that forms sensor after holder housing front end, grating is parallel vertically to be sticked in the bore area of support column and in hole, is full of filling glue, the upper surface of support column and membrane body close contact, between the lower surface of support column and holder housing, adopt circular cone type surface of contact, the optical fiber that is inserted in optical fiber jacket is fixed on holder housing lower end by fixture splice.
2. a kind of fiber grating dynamic high-pressure sensor according to claim 1, is characterized in that: described raster center wavelength can be any wavelength of C-band, and optical grating reflection rate is greater than 90%.
3. a kind of fiber grating dynamic high-pressure sensor according to claim 1, is characterized in that: described optical fiber is single-mode fiber.
4. a kind of fiber grating dynamic high-pressure sensor according to claim 1, is characterized in that: described membrane body has a cavity, and the bottom of cavity directly contacts with support cylinder upper surface, and the outside surface of cavity is helicitic texture.
5. a kind of fiber grating dynamic high-pressure sensor according to claim 1, is characterized in that: the outer setting of holder housing is fluted, places packing washer in groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420013624.2U CN203643079U (en) | 2014-01-09 | 2014-01-09 | Fiber bragg grating dynamic high pressure sensor |
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| CN201420013624.2U CN203643079U (en) | 2014-01-09 | 2014-01-09 | Fiber bragg grating dynamic high pressure sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712730A (en) * | 2014-01-09 | 2014-04-09 | 中国人民解放军总参谋部工程兵科研三所 | Fiber brag grating dynamic high-pressure transducer |
| CN105865529A (en) * | 2016-06-03 | 2016-08-17 | 山东省科学院激光研究所 | Optical fiber temperature pressure sensor |
-
2014
- 2014-01-09 CN CN201420013624.2U patent/CN203643079U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712730A (en) * | 2014-01-09 | 2014-04-09 | 中国人民解放军总参谋部工程兵科研三所 | Fiber brag grating dynamic high-pressure transducer |
| CN103712730B (en) * | 2014-01-09 | 2016-06-01 | 中国人民解放军总参谋部工程兵科研三所 | A kind of fiber grating dynamic high-pressure sensor |
| CN105865529A (en) * | 2016-06-03 | 2016-08-17 | 山东省科学院激光研究所 | Optical fiber temperature pressure sensor |
| CN105865529B (en) * | 2016-06-03 | 2017-11-14 | 山东省科学院激光研究所 | Optical fiber temperature and pressure sensor |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140611 Effective date of abandoning: 20160601 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |