CN201408100Y - High precision double corrugated pipe structure fiber grating liquid pressure sensor - Google Patents
High precision double corrugated pipe structure fiber grating liquid pressure sensor Download PDFInfo
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- CN201408100Y CN201408100Y CN2009200712848U CN200920071284U CN201408100Y CN 201408100 Y CN201408100 Y CN 201408100Y CN 2009200712848 U CN2009200712848 U CN 2009200712848U CN 200920071284 U CN200920071284 U CN 200920071284U CN 201408100 Y CN201408100 Y CN 201408100Y
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- corrugated pipe
- fiber grating
- optical fiber
- housing
- pressure sensor
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Abstract
A high precision double corrugated pipe structure fiber grating liquid pressure sensor comprises a shell, an outer corrugated pipe, an inner corrugated pipe and a fiber grating, wherein the inner corrugated pipe is arranged in the outer corrugated pipe, one ends of the inner corrugated pipe and the outer corrugated pipe are fixedly connected on a fixed end cap, the other ends of the inner corrugated pipe and the outer corrugated pipe are fixedly connected on a free terminal, the free terminal is arranged in the shell in a suspended mode, the fiber grating is suspended in the inner corrugated pipe, two ends of the fiber grating are respectively connected with a fiber fixing piece on the fixed end and the fiber fixing piece on the free end, a fluid guide hole is arranged in the fixed end cap, and the fluid guide hole is communicated with a pressure-bearing cavity between the inner corrugated pipe and the outer corrugated pipe. Fluid pressure changes enable the free terminal to be displaced, thereby extending and compressing the fiber grating, the reflecting wavelength of the fiber grating is moved, and the movement amount of the reflecting wavelength can be checked through an opticalsignal transmitted by an optical cable to obtain the change information of the fluid pressure. The high precision double corrugated pipe structure fiber grating liquid pressure sensor can be packed simply, and has high stability and reliability.
Description
Technical field:
The utility model relates to civil engineering work and sensory field of optic fibre, particularly a kind of high precision bi-bellow structured optical fiber grating fluid pressure sensor.
Background technology:
Hydrodynamic pressure is one of the most basic industrial process parameter.In industrial processes and heavy construction scene, a large amount of various pressure transducers have been used based on the electrical signal detection principle.manyly have electromagnetic interference (EMI), in the rugged surroundings such as the probability that is struck by lightning is bigger, inflammable, explosive, and under the situation of multimetering, sensor and checkout equipment distance, realize that accurately, safely, reliably the measurement of pressure is of great significance to security and the economy that guarantees production process.
In recent ten years, along with the fiber grating manufacturing technology increasingly mature, the fiber grating demodulation technology is perfect day by day, fiber grating has anti-electromagnetic interference (EMI), anticorrosive, anti-thunderbolt, the direct specific coding of wavelength, is not subjected to luminous power influence of fluctuations, long-term reliability and good stability, signal long-distance transmission, wavelength-division multiplex networking and plurality of advantages such as can use in inflammable and explosive environment, can finish hydrodynamic pressure measurement under rugged surroundings preferably based on the hydrodynamic pressure sensing and monitoring system of fiber grating principle.But because the presser sensor coefficient of fiber grating own is-1.98 * 10-6MPa-1 only, its insufficient sensitivity when directly using is so must carry out the requirement that the pressure enhanced sensitivity can satisfy practicability to fiber grating during pressure survey.Prior art is carried out the pressure enhanced sensitivity to fiber grating and is mainly contained following two kinds of ways:
1, polymer encapsulated mode: people such as Liu Yunqi reported on Chinese laser magazine (2000,27 (3), 211～214) and utilize the polymer encapsulated mode that the presser sensor coefficient of fiber grating is brought up to-6.28 * 10 in 2000
-5MPa
-1, being 31.7 times of naked grating, this encapsulating structure has the double action of pressure enhanced sensitivity and protection grating.But the packaging technology of this scheme is comparatively complicated, and causes the reflectance spectrum of fiber grating chirp phenomenon to occur easily, is unfavorable for surveying, and also has aging and creep, influences the stability and the reliability of sensor.
2, the pressure inverting mode of flexible member: Chinese patent " fiber grating liquid level the sensor " (patent No.: CN 200320117647.X) described a kind of liquid level sensor of pressure sensitization structure, the optical fiber that it constitutes housing, sheet flexible member and has fiber grating.The variation of fluid pressure causes the certain displacement of generation at sheet flexible member center, and then causes the deformation of fiber grating, causes the fiber grating reflection wavelength to be moved, by the mobile variation of knowing liquid level (hydraulic pressure) of monitoring fiber grating reflection wavelength.This patented technology has converted the variation of fluid pressure to fiber grating foveal reflex wavelength change well, but also there are the following problems for this technology: (1) for the range that guarantees sensor must carry out bigger prestretched to fiber grating, this has just increased the difficulty in the encapsulation process in encapsulation process; (2) to little range pressure sensor, bigger prestretched amount causes the appearance of sheet flexible member seriously non-linear, influences measuring accuracy; (3) this technical scheme can only single-endedly be drawn optical fiber, is unfavorable for networking.
Summary of the invention:
The purpose of this utility model is to provide a kind of high precision bi-bellow structured optical fiber grating fluid pressure sensor, and described this high precision bi-bellow structured optical fiber grating fluid pressure sensor will solve the technical matters that the fiber grating fluid pressure sensor is stable and reliability is undesirable, encapsulation difficulty is big in the prior art.
This high precision bi-bellow structured optical fiber grating fluid pressure sensor of the present utility model is by a housing, one first optical cable, one second optical cable, an outward corrugated tube, an inner corrugated pipe and a sensitive element constitute, wherein, described housing is the blind pipe shape, described inner corrugated pipe is arranged in the described outward corrugated tube, be provided with the gap between inner corrugated pipe and the outward corrugated tube, one end of inner corrugated pipe and an end of outward corrugated tube all are fixedly connected on a stiff end and cover, described fixedly end cap is fixedly connected on opening one end of housing, the other end of inner corrugated pipe and the other end of outward corrugated tube all are fixedly connected on the free terminal, described free terminal suspends and is arranged in the housing, fixedly be provided with a stiff end optical fiber fixture in the end cap, be provided with a free end optical fiber fixture in the free terminal, described sensitive element suspends and is arranged in the inner corrugated pipe, the two ends of sensitive element are connected with free end optical fiber fixture with described stiff end optical fiber fixture respectively, described first optical cable is connected with stiff end optical fiber fixture outside housing, described second optical cable penetrates housing and is connected with free end optical fiber fixture from the other end of housing, fixedly be provided with two fluid guide holes in the end cap, an end of any one described fluid guide hole all is communicated with gap between the outward corrugated tube with inner corrugated pipe.
Further, described fixedly end cap is connected with housing seal by screw thread.
Further, described fixedly end cap is connected with housing seal by welded structure.
Further, described sensitive element is fiber grating or fiber F-P cavity or string wire.
Principle of work of the present utility model is: with housing in the hydrodynamic pressure environment that changes, by the fluid guide hole, the variation of extraneous hydrodynamic pressure imposes on the pressure pocket that forms between outward corrugated tube and the inner corrugated pipe, under the drive of bi-bellow structure, free terminal is subjected to displacement, and then fiber grating is stretched or is compressed, thereby cause the moving of reflection wavelength of fiber grating, the amount of movement of the reflection wavelength of the optical signal detecting fiber grating that transmits by first optical cable, second optical cable can detect the change information that obtains hydrodynamic pressure.
The utility model and prior art compare, and its effect is actively with tangible.The utility model is connected fiber grating with the bi-bellow structure, utilize pressure in the pressure pocket in the bi-bellow structure to change to stretch or compress fiber grating, thereby cause the moving of reflection wavelength of fiber grating, come the amount of movement of detection fiber grating reflection wavelength by the light signal of optical cable transmission, can detect the change information that obtains hydrodynamic pressure.The utility model encapsulation is simple, stability and reliability height.
Description of drawings:
Fig. 1 is the structural representation of high precision bi-bellow structured optical fiber grating fluid pressure sensor of the present utility model.
Embodiment:
Embodiment 1:
As shown in Figure 1, high precision bi-bellow structured optical fiber grating fluid pressure sensor of the present utility model, by a housing 10, one first optical cable 11, one second optical cable 1, an outward corrugated tube 2, an inner corrugated pipe 3 and a sensitive element 7 constitute, wherein, described housing 10 is the blind pipe shape, described inner corrugated pipe 3 is arranged in the described outward corrugated tube 2, be provided with the gap between inner corrugated pipe 3 and the outward corrugated tube 2, one end of inner corrugated pipe 3 and an end of outward corrugated tube 2 all are fixedly connected on one fixedly on the end cap 4, described fixedly end cap 4 is fixedly connected on opening one end of housing 10, the other end of the other end of inner corrugated pipe 3 and outward corrugated tube 2 all is fixedly connected on the free terminal 8, described free terminal 8 suspends and is arranged in the housing 10, fixedly be provided with a stiff end optical fiber fixture 5 in the end cap 4, be provided with a free end optical fiber fixture 9 in the free terminal 8, described sensitive element 7 suspends and is arranged in the inner corrugated pipe 3, the two ends of sensitive element 7 are connected with free end optical fiber fixture 9 with described stiff end optical fiber fixture 5 respectively, described first optical cable 11 is connected with stiff end optical fiber fixture 5 outside housing 10, described second optical cable 1 penetrates housing 10 and is connected with free end optical fiber fixture 9 from the other end of housing 10, fixedly be provided with two fluid guide holes 6 in the end cap 4, an end of any one described fluid guide hole 6 all is communicated with gap between the outward corrugated tube 2 with inner corrugated pipe 3.
Further, described fixedly end cap 4 is tightly connected by screw thread and housing 10.
Further, described fixedly end cap 4 is tightly connected by welded structure and housing 10.
Further, described sensitive element 7 is fiber grating or fiber F-P cavity or string wire.
The course of work of present embodiment is: with housing 10 in the hydrodynamic pressure environment that changes, by fluid guide hole 6, the variation of extraneous hydrodynamic pressure imposes on the pressure pocket that forms between outward corrugated tube 2 and the inner corrugated pipe 3, under the drive of bi-bellow structure, free terminal 8 is subjected to displacement, and then fiber grating is stretched or is compressed, thereby cause the moving of reflection wavelength of fiber grating, the amount of movement of the reflection wavelength of the optical signal detecting fiber grating that transmits by first optical cable 11, second optical cable 1 can detect the change information that obtains hydrodynamic pressure.
Concrete, the manufacturing process of present embodiment is:
1) earlier with an end tail optical fiber of fiber grating by bonding or be weldingly fixed on the stiff end optical fiber fixture 5;
2) with stiff end optical fiber fixture 5 by the screw thread precession fixedly in the screwed hole of centre of end cap 4, and seal;
3) free end optical fiber fixture 9 and free terminal 8 are in the same place by bonding or welding firm fixation, then, fiber grating are stretched a little, utilize prior art that the tail optical fiber of this end of fiber grating 7 is fixed on the free end optical fiber fixture 9;
4) housing 10 being carried out sealing by screw thread and fixing end cap 4 is connected;
5) tail optical fiber of fiber grating armouring cable protection, and carry out and housing 10 between seal approach.
The material of inside and outside corrugated tube can be a kind of or other better elastic material of stainless steel, bronze.Inside and outside corrugated tube both can be the moulding corrugated tube, also can be welding bellows.Air chamber between housing and the outward corrugated tube can be established wireway, is communicated with atmosphere, plays the effect that balancing Atmospheric presses static pressure to change.
As to further improvement of the utility model, can fixedly can add annular permeable stone outside the end cap 4, permeable to play, as to stop silt effect.
As to further improvement of the utility model,, can play the effect of variation of ambient temperature compensation by changing the length or the material of stiff end optical fiber fixture 5.
Claims (4)
1. high precision bi-bellow structured optical fiber grating fluid pressure sensor, by a housing, one first optical cable, one second optical cable, an outward corrugated tube, an inner corrugated pipe and a sensitive element constitute, it is characterized in that: described housing is the blind pipe shape, described inner corrugated pipe is arranged in the described outward corrugated tube, be provided with the gap between inner corrugated pipe and the outward corrugated tube, one end of inner corrugated pipe and an end of outward corrugated tube all are fixedly connected on a stiff end and cover, described fixedly end cap is fixedly connected on opening one end of housing, the other end of inner corrugated pipe and the other end of outward corrugated tube all are fixedly connected on the free terminal, described free terminal suspends and is arranged in the housing, fixedly be provided with a stiff end optical fiber fixture in the end cap, be provided with a free end optical fiber fixture in the free terminal, described sensitive element suspends and is arranged in the inner corrugated pipe, the two ends of sensitive element are connected with free end optical fiber fixture with described stiff end optical fiber fixture respectively, described first optical cable is connected with stiff end optical fiber fixture outside housing, described second optical cable penetrates housing and is connected with free end optical fiber fixture from the other end of housing, fixedly be provided with two fluid guide holes in the end cap, an end of any one described fluid guide hole all is communicated with gap between the outward corrugated tube with inner corrugated pipe.
2. high precision bi-bellow structured optical fiber grating fluid pressure sensor as claimed in claim 1, it is characterized in that: described fixedly end cap is connected with housing seal by screw thread.
3. high precision bi-bellow structured optical fiber grating fluid pressure sensor as claimed in claim 1, it is characterized in that: described fixedly end cap is connected with housing seal by welded structure.
4. high precision bi-bellow structured optical fiber grating fluid pressure sensor as claimed in claim 1, it is characterized in that: described sensitive element is fiber grating or fiber F-P cavity or string wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200712848U CN201408100Y (en) | 2009-04-28 | 2009-04-28 | High precision double corrugated pipe structure fiber grating liquid pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200712848U CN201408100Y (en) | 2009-04-28 | 2009-04-28 | High precision double corrugated pipe structure fiber grating liquid pressure sensor |
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|---|---|
| CN201408100Y true CN201408100Y (en) | 2010-02-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200712848U Expired - Fee Related CN201408100Y (en) | 2009-04-28 | 2009-04-28 | High precision double corrugated pipe structure fiber grating liquid pressure sensor |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308446A (en) * | 2013-05-31 | 2013-09-18 | 重庆大学 | Fluid compressibility test device based on corrugated pipes |
| CN105940286A (en) * | 2013-08-16 | 2016-09-14 | 辉固技术有限公司 | Sensor for detecting pressure waves in liquid |
| CN106093464A (en) * | 2016-07-27 | 2016-11-09 | 山东省科学院激光研究所 | A kind of optical fiber differential pressure air velocity transducer and application |
| CN106323535A (en) * | 2015-06-16 | 2017-01-11 | 中国石油天然气股份有限公司 | Optical fiber pressure sensor device |
| CN110017938A (en) * | 2019-03-20 | 2019-07-16 | 常州天利智能控制股份有限公司 | A kind of bellows type pressure sensor and the automatic controller with it |
| CN110514350A (en) * | 2019-09-04 | 2019-11-29 | 四川拜安科技有限公司 | A kind of MEMS pressure sensor is loaded on the contact force sensor of ring bellows |
| CN111174952A (en) * | 2020-01-17 | 2020-05-19 | 安徽理工大学 | Mining area mining subsidence rule prediction method |
| CN113532724A (en) * | 2021-08-26 | 2021-10-22 | 中国核动力研究设计院 | High-temperature and high-pressure resistant optical fiber force sensor |
-
2009
- 2009-04-28 CN CN2009200712848U patent/CN201408100Y/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308446B (en) * | 2013-05-31 | 2016-01-20 | 重庆大学 | Based on the fluid compressible system safety testing device of corrugated tube |
| CN103308446A (en) * | 2013-05-31 | 2013-09-18 | 重庆大学 | Fluid compressibility test device based on corrugated pipes |
| CN105940286A (en) * | 2013-08-16 | 2016-09-14 | 辉固技术有限公司 | Sensor for detecting pressure waves in liquid |
| CN105940286B (en) * | 2013-08-16 | 2019-08-09 | 辉固技术有限公司 | For detecting the sensor of the pressure wave in liquid |
| CN106323535A (en) * | 2015-06-16 | 2017-01-11 | 中国石油天然气股份有限公司 | Optical fiber pressure sensor device |
| CN106323535B (en) * | 2015-06-16 | 2019-03-12 | 中国石油天然气股份有限公司 | Fibre optic compression sensor device |
| CN106093464B (en) * | 2016-07-27 | 2022-09-20 | 山东省科学院激光研究所 | Optical fiber differential pressure wind speed sensor and application |
| CN106093464A (en) * | 2016-07-27 | 2016-11-09 | 山东省科学院激光研究所 | A kind of optical fiber differential pressure air velocity transducer and application |
| CN110017938A (en) * | 2019-03-20 | 2019-07-16 | 常州天利智能控制股份有限公司 | A kind of bellows type pressure sensor and the automatic controller with it |
| CN110514350A (en) * | 2019-09-04 | 2019-11-29 | 四川拜安科技有限公司 | A kind of MEMS pressure sensor is loaded on the contact force sensor of ring bellows |
| CN111174952A (en) * | 2020-01-17 | 2020-05-19 | 安徽理工大学 | Mining area mining subsidence rule prediction method |
| CN113532724A (en) * | 2021-08-26 | 2021-10-22 | 中国核动力研究设计院 | High-temperature and high-pressure resistant optical fiber force sensor |
| CN113532724B (en) * | 2021-08-26 | 2023-08-18 | 中国核动力研究设计院 | High-temperature-resistant high-pressure optical fiber sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20100217 Termination date: 20140428 |