CN202255710U - Fiber grating pressure sensor with T-shaped structure and easiness for being connected in series - Google Patents
Fiber grating pressure sensor with T-shaped structure and easiness for being connected in series Download PDFInfo
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- CN202255710U CN202255710U CN2011202856085U CN201120285608U CN202255710U CN 202255710 U CN202255710 U CN 202255710U CN 2011202856085 U CN2011202856085 U CN 2011202856085U CN 201120285608 U CN201120285608 U CN 201120285608U CN 202255710 U CN202255710 U CN 202255710U
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Abstract
The utility model provides a fiber grating pressure sensor with a T-shaped structure and easiness for being connected in series. An intermediate port of the sensor is communicated with a gas or liquid pipeline to be measured and is used for measuring pressure; two ends of the upper part of the sensor are sealed and are used for outputting a fiber; and the structure can be easily connected in series with other fiber grating sensors. The working principle of the sensor is that the deformation is generated in a center through an internal elastic membrane under the action of a pressure load to stretch a fine steel pipe in which a pressure-measuring fiber grating is encapsulated, so as to achieve the measurement for the pressure. One temperature-measuring fiber grating is additionally placed in the sensor and is used for carrying out temperature compensation on the pressure-measuring fiber grating, and simultaneously, the measurement for the temperature of liquid or gas to be measured can also be achieved. The fiber grating pressure sensor provided by the utility model can be easily connected in series with other sensors; two physical quantities, namely the pressure and the temperature can be measured simultaneously; and the fiber grating pressure sensor can be applied to gas and liquid multipoint pressure measuring systems in the fields of petrochemical industry, water conservancy, aerospace and the like.
Description
Technical field
The utility model relates to the fiber bragg grating pressure sensor that a kind of T type structure is easy to be connected in series, and belongs to technical field of optical fiber sensing.
Technical background
In the modern industrial process, pressure is a very important parameter, and pressure survey has a wide range of applications in commercial production.A lot of about the research and the product of pressure detection both at home and abroad; Not only anti-electromagnetic interference capability is poor for traditional electrical measurement method, and is to be connected in series, in extensive multiple spot pressure monitor system; Certainly will cause the lot of data signal wire, take a large amount of finite space resources.Fiber bragg grating pressure sensor not only has Sefe antiexplosion, and is corrosion-resistant, and anti-dried electromagnetic interference capability is strong; Can under complicated rugged environment, work, advantages such as long distance of signal transmission the more important thing is through wavelength-division multiplex technique; Fiber bragg grating pressure sensor can be realized the serial connection between a plurality of sensors; In the large scale measurement system, significantly reduce the quantity of data signal line, for the construction wiring brings very big facility.Yet the structural design of existing fiber bragg grating pressure sensor is not considered the serial connection problem between the sensor mostly, and the be connected in series advantage of fiber-optic grating sensor is not shown.
Sun Ying etc. put forward a kind of high-sensitivity optical fiber optical grating pressure transducer (referring to document " research of high-sensitivity optical fiber optical grating pressure transducer and pressure characteristic thereof "; From periodical " optics journal "; In January, 2002,22 the 1st phases of volume), this sensor uses organic polymer to come the packaged fiber grating; The compressive deformation of polymkeric substance is acted on fiber grating; Produce the wavelength change of fiber grating, but the elastic strength temperature influence of polymkeric substance is bigger, causes this pressure transducer temperature influence bigger; Simultaneously, this Sensor Design is not considered the serial connection problem between the sensor.The two kinds of measuring optical fiber grating pressure sensors that can realize underground oil well mesohigh and temperature of people such as Zhao Yong design; (referring to document " Simultaneous Measurement of Down-Hole High Pressure and Temperature With a Bulk-Modulus and FBG Sensor "; Photonics Technology Letters; 2002,11 (14); " Differential FBG sensor for Temperature-Compensated High-Pressure Measurement "; Optic&Laser Technology; 2004,2 (36) .), and the patent No. is 200910011515.0 Chinese patent " a kind of novel optical fiber and optical grating pressure transducer "; Distortion through free telescopic resilience drum is produced under pressure is delivered on the semi-girder; Cause that the optic fiber grating wavelength that sticks on the semi-girder upper and lower surfaces changes, this sensor construction is complicated, does not also consider the serial connection problem between the sensor.The thin-walled strain cartridge type fiber bragg grating pressure sensor that people such as Shen Rensheng propose is (referring to document " research of thin-walled strain cartridge type fiber bragg grating pressure sensor "; From periodical " photoelectron laser "; In November, 2008,19 volume o. 11ths), two fiber gratings are sticked on the outer wall of thin-walled strain tube along axial and circumferential respectively; A grating measuring pressure, another grating is used for doing temperature compensation.The pressure transducer of this structure is not considered the serial connection problem between the sensor equally.The fiber bragg grating pressure sensor that Wang person of outstanding talent etc. propose is (referring to document " the band temperature compensation is based on the fiber bragg grating pressure sensor of thin-wall tubular structure "; From periodical " nanometer technology and precision engineering ", in June, 2009,7 the 3rd phases of volume); With thin cylinder directly as elastic body; Under pressure, produce axial displacement and spur presser sensor optical fiber to realize pressure sensing, though this sensor has been considered the serial connection problem between the sensor, complex structure; During batch process, the sensor consistance is difficult to obtain assurance.The patent No. is 200710051243.8 Chinese patent " high-sensitivity optical fiber optical grating pressure transducer "; Fiber grating is encapsulated in the polyurethane elastomer; And place the center of metal spring, and the two ends of metal spring are sealed with sheet metal, and pressure acts on the sheet metal; The compressed metal spring makes fiber grating produce strain and comes gaging pressure.This sensor has highly sensitive, and is simple in structure, but the polyurethane elastomer temperature influence is bigger.
The utility model content
The purpose of the utility model is to propose the fiber bragg grating pressure sensor that a kind of T type structure is easy to be connected in series to the actual needs in the fiber bragg grating pressure sensor modern industrial and the deficiency of prior art.This fiber bragg grating pressure sensor can solve the influence of temperature to pressure measurements simultaneously well, can measure simultaneously two physical quantitys of pressure and temperature.
The purpose of the utility model reaches through following measure:
A kind of T type structured optical fiber grating pressure sensor (shown in accompanying drawing 1), it comprises optical fiber, rear end cap, thermometric fiber grating, brace summer, fine steel tube, shell, pressure measurement fiber grating, flexible sheet and front end end cover; Described shell is a T type pipe, wherein between the mouth of pipe (lower nozzle) be the pressure survey port; Thermometric fiber grating and pressure measurement fiber grating serial connection are encapsulated in the fine steel tube through adhesive, and are placed in the both sides of brace summer respectively; Fine steel tube is rigidly fixed on flexible sheet, brace summer and the rear end cap; Flexible sheet is fixed on the port of the forward end cap of shell upper and seals this port; Front end end cover and rear end cap be can both upper ends thereof mouth respectively, and optical fiber pigtail is drawn from shell sealed at both ends position through front end end cover and rear end cap.
This T type structured optical fiber grating pressure sensor, the middle mouth of pipe of its shell is provided with connecting thread, and this centre mouth of pipe is the pressure survey port, and it and gas to be measured or fluid pipeline are through screw threads for fastening UNICOM.
The described T type of the utility model structured optical fiber grating pressure sensor, end cap is thicker than front end end cover thereafter.
This T type structured optical fiber grating pressure sensor intermediate pressure measurement port and gas to be measured or fluid pipeline are through screw threads for fastening UNICOM, and both upper ends thereof seals.Thermometric fiber grating and pressure measurement fiber grating are fixed on fine steel tube inside, and fine steel tube is rigidly fixed on flexible sheet, brace summer and the rear end cap, and signal transmission fiber is from T type structured optical fiber grating pressure sensor both upper ends thereof sealing position output.Gas or liquid get into sensor internal through the sensor Centronics port; Act on the flexible sheet; Deform as the time spent when flexible sheet is under pressure, the fine steel tube that is fixed between flexible sheet and the brace summer is stretched, and the result causes fiber grating to change.Rear end cap is more thick and heavy, and air pressure or hydraulic pressure can not produce obviously distortion to it, is fixed on the influence that is not stressed of thermometric fiber grating between brace summer and the rear end cap, and it only is used for measuring temperature, is used for carrying out temperature compensation.This thermometric fiber grating and pressure measurement fiber grating serial connection, tail optical fiber output from the sensor two ends is used for being connected in series with other sensor.
The utility model compared with prior art has following outstanding feature:
1, this sensor adopts T type structure, and signal transmission fiber is easy to be connected in series with other sensor from the output of sensor both upper ends thereof;
2, thermometric fiber grating and pressure measurement fiber grating are in the same temperature field, and the thermometric fiber grating can play good temperature compensation function to the pressure measurement fiber grating, also can realize the measurement to fluid to be measured or gas temperature simultaneously.
Description of drawings
Fig. 1 is the series connected fiber bragg grating pressure sensor structural representation of this T type structure
Fig. 2 is the side view of the series connected fiber bragg grating pressure sensor of T type structure shown in Figure 1
Among the figure: 1-optical fiber, 2-rear end cap, 3-thermometric fiber grating, 4-brace summer, 5-fine steel tube, 6-shell, 7-pressure measurement fiber grating, 8-adhesive, 9-flexible sheet, 10-front end end cover, 11-pressure survey port.
Embodiment
Technical scheme below in conjunction with 1 pair of the utility model of accompanying drawing further describes with the realization principle.Fiber bragg grating pressure sensor shell 6 adopts T type tubular construction, and the testing pressure pipeline is that pressure survey port one 1 connects through the mouth of pipe in the middle of the shell 6, and shell 6 both upper ends thereof mouths are through front end end cover 10 and rear end cap 2 sealings.Thermometric fiber grating 3 is encapsulated in the fine steel tube 5 through adhesive 8 with pressure measurement fiber grating 7, and fine steel tube 5 is rigidly fixed in compression elasticity diaphragm 9, brace summer 4 and rear end cap 2 medium positions through adhesive 8.Thermometric fiber grating 3 is connected in series with pressure measurement fiber grating 7, is placed in the both sides of brace summer 4 respectively.Optical fiber 1 tail optical fiber carries out seal protection output through front end end cover 10 and rear end cap 2.When pressure is done the time spent, flexible sheet 9 deforms, and this distortion acts on the pressure measurement fiber grating 7 through fine steel tube 5, causes pressure measurement fiber grating 7 center wavelength variation.Brace summer 4 is more thick and heavy with rear end cap 10, and the effect of pressure can not produce obvious distortion, and the effect so thermometric fiber grating 3 is not stressed only is used for measuring temperature.
Claims (3)
1. T type structured optical fiber grating pressure sensor, it is characterized in that: it comprises optical fiber (1), rear end cap (2), thermometric fiber grating (3), brace summer (4), fine steel tube (5), shell (6), pressure measurement fiber grating (7), flexible sheet (9) and front end end cover (10); Shell (6) is a T type pipe; Its lower nozzle is pressure survey port (11); Thermometric fiber grating (3) and pressure measurement fiber grating (7) serial connection are encapsulated in the fine steel tube (5) through adhesive (8); And be placed in the both sides of brace summer (4) respectively, and fine steel tube (5) is rigidly fixed on flexible sheet (9), brace summer (4) and the rear end cap (2), and flexible sheet (9) is fixed on the port of the forward end cap in shell (6) top (10) and seals this port; Front end end cover (10) and rear end cap (2) be can (6) both upper ends thereof mouth respectively, and optical fiber (1) tail optical fiber is drawn from shell (6) sealed at both ends position through front end end cover (10) and rear end cap (2).
2. T type structured optical fiber grating pressure sensor according to claim 1 is characterized in that: the pressure survey port (11) of shell (6) is provided with connecting thread.
3. T type structured optical fiber grating pressure sensor according to claim 1, it is characterized in that: rear end cap (2) is thicker than front end end cover (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202856085U CN202255710U (en) | 2011-08-08 | 2011-08-08 | Fiber grating pressure sensor with T-shaped structure and easiness for being connected in series |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202856085U CN202255710U (en) | 2011-08-08 | 2011-08-08 | Fiber grating pressure sensor with T-shaped structure and easiness for being connected in series |
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| Publication Number | Publication Date |
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| CN202255710U true CN202255710U (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011202856085U Expired - Fee Related CN202255710U (en) | 2011-08-08 | 2011-08-08 | Fiber grating pressure sensor with T-shaped structure and easiness for being connected in series |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944270A (en) * | 2012-11-16 | 2013-02-27 | 中国科学院半导体研究所 | Dynamometry-type optical fiber flowmeter |
| CN103076049A (en) * | 2013-02-04 | 2013-05-01 | 中国科学院半导体研究所 | Pressure difference type optical fiber flow meter |
| CN110398229A (en) * | 2019-07-30 | 2019-11-01 | 中国地质大学（武汉） | A kind of subgrade settlement monitoring device and its installation method based on Fiber Bragg Grating technology |
| CN111189744A (en) * | 2020-03-16 | 2020-05-22 | 广西交通科学研究院有限公司 | Device and method for detecting grouting compactness of duct |
| CN111964816A (en) * | 2020-08-19 | 2020-11-20 | 中国航空工业集团公司沈阳飞机设计研究所 | Grating pressure sensor for detecting pipeline pressure and measuring system with same |
-
2011
- 2011-08-08 CN CN2011202856085U patent/CN202255710U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944270A (en) * | 2012-11-16 | 2013-02-27 | 中国科学院半导体研究所 | Dynamometry-type optical fiber flowmeter |
| CN103076049A (en) * | 2013-02-04 | 2013-05-01 | 中国科学院半导体研究所 | Pressure difference type optical fiber flow meter |
| CN110398229A (en) * | 2019-07-30 | 2019-11-01 | 中国地质大学（武汉） | A kind of subgrade settlement monitoring device and its installation method based on Fiber Bragg Grating technology |
| CN111189744A (en) * | 2020-03-16 | 2020-05-22 | 广西交通科学研究院有限公司 | Device and method for detecting grouting compactness of duct |
| CN111964816A (en) * | 2020-08-19 | 2020-11-20 | 中国航空工业集团公司沈阳飞机设计研究所 | Grating pressure sensor for detecting pipeline pressure and measuring system with same |
| CN111964816B (en) * | 2020-08-19 | 2022-04-01 | 中国航空工业集团公司沈阳飞机设计研究所 | Grating pressure sensor for detecting pipeline pressure and measuring system with same |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120530 Termination date: 20120808 |