CN203177813U - Strain detector for surface of pressure piping based on fiber grating sensor - Google Patents
Strain detector for surface of pressure piping based on fiber grating sensor Download PDFInfo
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- CN203177813U CN203177813U CN 201320180623 CN201320180623U CN203177813U CN 203177813 U CN203177813 U CN 203177813U CN 201320180623 CN201320180623 CN 201320180623 CN 201320180623 U CN201320180623 U CN 201320180623U CN 203177813 U CN203177813 U CN 203177813U
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- grating sensor
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- optic grating
- pressure pipeline
- down support
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Abstract
The utility model discloses a strain detector for a surface of pressure piping based on a fiber grating sensor, which comprises a fiber grating sensor and pedestals of the fiber grating sensor. When corresponding micro strain on the surface of the pipeline is produced because of material creep, the pedestal of the fiber grating sensor fixed on the surface of the pipeline produces relative placement. Therefore, the fiber grating is stretched and Bragg reflection wavelength thereof is changed. Reflected light of the fiber grating goes into a signal conditioner for conditioning and electric signals formed thereafter are transmitted to a computer for data processing so as to obtain stress data and displacement data on an arc surface between the two fixed pedestals of the fiber grating sensor.
Description
Technical field
This patent relates to a kind of pressure pipeline surface strain measurement mechanism, relates in particular to a kind of pick-up unit based on the strain of fiber-optic grating sensor gaging pressure pipe surface.
Background technology
Pressure pipeline surface stress strain regime be pressure pipeline in the general performance of risk status lower stress, be related to the mechanics safety of pressure pipeline.The pressure pipeline surface strain detects the generation that can effectively prevent the pressure pipeline pipe explosion accident, the most frequently used method of testing has artificial milscale detection method and resistance-strain chip detection method at present, the shortcoming of artificial milscale detection method is to realize that real-time online detects, and complex procedures, it is low to measure efficient, and measuring error is big, have a strong impact on measuring accuracy, and resistance-strain chip detection method measuring accuracy is not high, and is subject to electromagnetic interference (EMI), is not suitable for inflammable and explosive occasion and detects.The strain of fiber-optic grating sensor detected pressures pipe surface is a kind of full light sensing, high precision, anti-electromagnetic interference (EMI), essential safety and the higher technological means of efficient, is convenient to realize online multiple spot Distributed Detection simultaneously.Because the pressure pipeline surface is periphery, is not the plane, and the strain fiber-optic grating sensor is generally the encapsulation of one dimension rectilinear form, can't be directly installed on the pressure pipeline circumferential surface and detect.
Summary of the invention
In order to overcome the defective of existing pressure pipeline surface strain detection technique means, the invention provides the pressure pipeline surface strain pick-up unit based on fiber-optic grating sensor, this device is delivered to the pressure pipeline radial strain on the fiber-optic grating sensor, realization is to the detection of pressure pipeline surface strain, the pressure pipeline pipe explosion accident is carried out early warning, simple in structure, realize reliable working performance easily.
In order to realize the foregoing invention purpose, the present invention adopts following technical scheme: the pressure pipeline surface strain pick-up unit based on fiber-optic grating sensor comprises: comprise fiber-optic grating sensor (2), fiber-optic grating sensor hold-down support (3) and fiber-optic grating sensor hold-down support (4).Fiber-optic grating sensor hold-down support (3) and fiber-optic grating sensor hold-down support (4) are weldingly fixed on respectively on the pressure pipeline surface (1); Described fiber-optic grating sensor hold-down support (3) comprises metallic substrates (5), fiber-optic grating sensor tripod fixed mount (6) and fiber-optic grating sensor standing screw (7); Described metallic substrates (5) is differential of the arc shape bulk, and fiber-optic grating sensor tripod fixed mount (6) vertically is fixedly welded on the top cambered surface of metallic substrates (5); Described fiber-optic grating sensor tripod fixed mount (6) comprises that cylindrical bar follows three triangle firm bankings; Described three triangle firm bankings are fixed on a week of cylindrical bar bottom with welding manner apart from one another by 120 degree angles, the top of cylindrical bar is drilled with threaded hole, the cylindrical bar side top is equipped with the rectangle hollow hole, and fiber-optic grating sensor standing screw (7) screws in threaded hole; The two ends of described fiber-optic grating sensor (2) screw stretching fixing by the fiber-optic grating sensor standing screw (7) of fiber-optic grating sensor hold-down support (3) and fiber-optic grating sensor hold-down support (4) respectively.
Described fiber-optic grating sensor (2) is handled through packaging protection.
Described fiber-optic grating sensor hold-down support (4) is identical with the physical dimension of fiber-optic grating sensor hold-down support (3).
Described fiber-optic grating sensor standing screw (7) adopts the medium-sized length screw rod of front end tack, screw front end rubber sleeve (8) cover envelope.
The length of described fiber-optic grating sensor standing screw (7) is slightly larger than the height in rectangle hollow hole.
Described fiber-optic grating sensor hold-down support (3), fiber-optic grating sensor hold-down support (4) adopt the covered arc welding mode to weld fixing with the welding on pressure pipeline surface (1).
The material that described metallic substrates (5) is selected for use is mated with the pressure pipeline material capability that needs to detect as far as possible.
Described fiber-optic grating sensor (2) installation site is higher than pressure pipeline surface (1), does not contact with pressure pipeline surface (1).
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is structure sectional drawing of the present invention;
Fig. 2 is grating hold-down support structural representation;
Fig. 3 is use figure of the present invention.
In the accompanying drawing: 1 is the pressure pipeline surface; 2 is fiber-optic grating sensor; 3,4 be the fiber-optic grating sensor hold-down support; 5 is metab; 6 is fiber-optic grating sensor tripod fixed mount; 7 is the fiber-optic grating sensor standing screw; 8 is rubber sleeve.
Embodiment
Among Fig. 1, the pressure pipeline surface strain pick-up unit based on fiber-optic grating sensor comprises fiber-optic grating sensor 2, fiber-optic grating sensor hold-down support 3 and fiber-optic grating sensor hold-down support 4.Fiber-optic grating sensor hold-down support 3 and fiber-optic grating sensor hold-down support 4 are weldingly fixed on respectively on the pressure pipeline surface 1.Fiber-optic grating sensor hold-down support 3 comprises metallic substrates 5, fiber-optic grating sensor tripod fixed mount 6 and fiber-optic grating sensor standing screw 7.Metallic substrates 5 is differential of the arc shape bulk, and fiber-optic grating sensor tripod fixed mount 6 vertically is fixedly welded on the top cambered surface of metallic substrates 5.Fiber-optic grating sensor tripod fixed mount 6 comprises cylindrical bar and three triangle firm bankings.Three triangle firm bankings are mutually 120 degree, are fixed on week of cylindrical bar bottom with welding manner, and the top of cylindrical bar is drilled with threaded hole, and the cylindrical bar side top is drilled with the rectangle hollow hole, and fiber-optic grating sensor standing screw 7 screws in threaded hole.The two ends of fiber-optic grating sensor 2 are tightened stretching by the fiber-optic grating sensor standing screw 7 on fiber-optic grating sensor hold-down support 3 and the fiber-optic grating sensor hold-down support 4 respectively.
The sensing principle of optical fiber Bragg raster:
Measure the ultimate principle of strain according to optical fiber Bragg raster, the strain meeting causes that the pitch of optical fiber Bragg raster changes, thereby the reflectance spectrum of optical fiber Bragg raster is offset.Variation by detection fiber Bragg optical grating reflection spectrum just can obtain corresponding strain information.According to the optical fiber coupled-mode theory, when broadband light is transmitted, produce Mode Coupling in optical fiber Bragg raster, the light that satisfies the Bragg condition is reflected:
λ
B＝2n
effΛ
Wherein, n
EffBe the effective refractive index of guided mode, Λ is grid cycle.So, the foveal reflex wavelength X of fiber-optic grating sensor
BChange with n
EffChange with Λ.
Embodiment
Pressure pipeline surface strain pick-up unit based on fiber-optic grating sensor comprises fiber-optic grating sensor 2, fiber-optic grating sensor hold-down support 3 and fiber-optic grating sensor hold-down support 4.As Fig. 3, open wideband light source, light enters in the fiber-optic grating sensor 2 on the pressure pipeline bearing by optoisolator and photo-coupler.Fiber-optic grating sensor hold-down support 3,4 metallic substrates 5 is differential of the arc shape bulk, corresponding to the pressure pipeline size in the commercial Application, metallic substrates 5 can finely be agreed with pressure pipeline surface 1, by covered arc welding mode weld metal substrate 5 and pressure pipeline surface 1.Fiber-optic grating sensor hold-down support 3 and fiber-optic grating sensor hold-down support 4 radially are fixed in pressure pipeline surface 1 with suitable distance, the two ends of fiber-optic grating sensor 2 are tightened stretching by the fiber-optic grating sensor standing screw 7 of fiber-optic grating sensor hold-down support 3,4 respectively.When pressure pipeline surface 1 produces corresponding microstrain because of reasons such as material creeps, corresponding change in displacement can take place in the fiber-optic grating sensor hold-down support 3 that is fixed thereon and fiber-optic grating sensor hold-down support 4, fiber-optic grating sensor 2 is subjected to certain stretching action, makes its grating Bragg reflection wavelength change.Reflected light is sent into demodulator of PM signal PM carry out demodulation, electric signal after the demodulation finally passes to computing machine and carries out the data processing, thereby obtains strain data and the displacement data on pressure pipeline surface between fiber-optic grating sensor hold-down support 3 and the fiber-optic grating sensor hold-down support 4.
Claims (6)
1. based on the pressure pipeline surface strain pick-up unit of fiber-optic grating sensor, comprise fiber-optic grating sensor (2), fiber-optic grating sensor hold-down support (3) and fiber-optic grating sensor hold-down support (4); Fiber-optic grating sensor hold-down support (3) and fiber-optic grating sensor hold-down support (4) are weldingly fixed on respectively on the pressure pipeline surface (1); Described fiber-optic grating sensor hold-down support (3) comprises metallic substrates (5), fiber-optic grating sensor fixed bar (6) and fiber-optic grating sensor standing screw (7); Described metallic substrates (5) is differential of the arc shape bulk, and fiber-optic grating sensor fixed bar (6) vertically is fixedly welded on the top cambered surface of metallic substrates (5); The top of described fiber-optic grating sensor fixed bar (6) is drilled with threaded hole, and side top is equipped with the rectangle hollow hole, and fiber-optic grating sensor standing screw (7) screws in threaded hole; The two ends of described fiber-optic grating sensor sensor (2) are stretching fixing by the fiber-optic grating sensor standing screw (7) of fiber-optic grating sensor hold-down support (3) and fiber-optic grating sensor hold-down support (4) respectively.
2. the pressure pipeline surface strain pick-up unit based on fiber-optic grating sensor according to claim 1, it is characterized in that: described fiber-optic grating sensor hold-down support (4) is identical with the physical dimension of fiber-optic grating sensor hold-down support (3).
3. the pressure pipeline surface strain pick-up unit based on fiber-optic grating sensor according to claim 1 is characterized in that: the material that described metallic substrates (5) is selected for use is identical with the pressure pipeline material that needs detect.
4. the pressure pipeline surface strain pick-up unit based on fiber-optic grating sensor according to claim 1 is characterized in that: described fiber-optic grating sensor hold-down support (3), fiber-optic grating sensor hold-down support (4) adopt the covered arc welding mode to weld fixing with the welding on pressure pipeline surface (1).
5. the pressure pipeline surface strain pick-up unit based on fiber-optic grating sensor according to claim 1, it is characterized in that: described fiber-optic grating sensor (2) installation site is higher than pressure pipeline surface (1), does not contact with pressure pipeline surface (1).
6. the pressure pipeline surface strain pick-up unit based on fiber-optic grating sensor according to claim 1 is characterized in that: the medium-sized length screw rod of described fiber-optic grating sensor standing screw (7) employing front end tack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320180623 CN203177813U (en) | 2013-04-10 | 2013-04-10 | Strain detector for surface of pressure piping based on fiber grating sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320180623 CN203177813U (en) | 2013-04-10 | 2013-04-10 | Strain detector for surface of pressure piping based on fiber grating sensor |
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| CN203177813U true CN203177813U (en) | 2013-09-04 |
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| CN 201320180623 Expired - Fee Related CN203177813U (en) | 2013-04-10 | 2013-04-10 | Strain detector for surface of pressure piping based on fiber grating sensor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105877583A (en) * | 2016-04-11 | 2016-08-24 | 洪明 | Intelligent toilet paper box |
| CN105890534A (en) * | 2015-01-19 | 2016-08-24 | 中国计量学院 | High-temperature pressure pipeline outer wall strain guide rod fiber grating sensing device |
| CN107367239A (en) * | 2016-05-12 | 2017-11-21 | 中国计量大学 | A kind of loop configuration high-temperature pipe outer wall strain detecting fiber-optic grating sensor part |
| CN108007370A (en) * | 2017-10-24 | 2018-05-08 | 重庆建工第三建设有限责任公司 | A kind of fiber Bragg grating strain sensor installs monitoring system |
| CN109520666A (en) * | 2019-01-03 | 2019-03-26 | 大连理工大学 | A kind of non-destructive monitoring method of pipeline internal pressure |
| CN110967138A (en) * | 2018-09-28 | 2020-04-07 | 罗斯蒙特公司 | Non-invasive process fluid pressure measurement system |
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2013
- 2013-04-10 CN CN 201320180623 patent/CN203177813U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105890534A (en) * | 2015-01-19 | 2016-08-24 | 中国计量学院 | High-temperature pressure pipeline outer wall strain guide rod fiber grating sensing device |
| CN105890534B (en) * | 2015-01-19 | 2019-01-11 | 中国计量学院 | A kind of high temperature pressure pipeline outer wall strain guide rod fiber-optic grating sensor part |
| CN105877583A (en) * | 2016-04-11 | 2016-08-24 | 洪明 | Intelligent toilet paper box |
| CN107367239A (en) * | 2016-05-12 | 2017-11-21 | 中国计量大学 | A kind of loop configuration high-temperature pipe outer wall strain detecting fiber-optic grating sensor part |
| CN108007370A (en) * | 2017-10-24 | 2018-05-08 | 重庆建工第三建设有限责任公司 | A kind of fiber Bragg grating strain sensor installs monitoring system |
| CN110967138A (en) * | 2018-09-28 | 2020-04-07 | 罗斯蒙特公司 | Non-invasive process fluid pressure measurement system |
| CN109520666A (en) * | 2019-01-03 | 2019-03-26 | 大连理工大学 | A kind of non-destructive monitoring method of pipeline internal pressure |
| CN109520666B (en) * | 2019-01-03 | 2020-07-14 | 大连理工大学 | Nondestructive monitoring method for pressure inside pipeline |
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Granted publication date: 20130904 Termination date: 20140410 |