CN203811318U - Fiber-bragg grating pressure sensor used for dam osmotic pressure monitoring based on diaphragm-type packaging structure - Google Patents
Fiber-bragg grating pressure sensor used for dam osmotic pressure monitoring based on diaphragm-type packaging structure Download PDFInfo
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- CN203811318U CN203811318U CN201420258751.9U CN201420258751U CN203811318U CN 203811318 U CN203811318 U CN 203811318U CN 201420258751 U CN201420258751 U CN 201420258751U CN 203811318 U CN203811318 U CN 203811318U
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Abstract
The utility morel relates to a fiber-bragg grating pressure sensor used for dam osmotic pressure monitoring based on a diaphragm-type packaging structure relating to a pressure monitoring system. The problem of the conventional fiber-bragg grating pressure sensors of the weak anti-interference ability can be solved. The light emitted by a broadband light source can be sent to a light intensity modulator after being filtered by a filter, and an optical signal output end of the light intensity modulator is connected with a first optical signal input end of a circulator; a first optical signal output end of the circulator is connected with a first optical signal input end of an optical fiber coupler; the optical signal after being coupled by the optical fiber coupler can be divided into n channels, and can be sent to n pressure sensor units; the optical fiber coupler can be used to acquire the optical signals reflected by the n pressure sensor units; the optical signal output end of the optical fiber coupler is connected with a second optical signal input end of the circulator, and the second optical signal output end of the circulator is connected with an optical signal input end of a spectrum analyzer; and the pressure sensor units comprise pressure sensors and flat diaphragms. The fiber-bragg grating pressure sensor is suitable for the pressure monitoring system.
Description
Technical field
The utility model relates to a kind of pressure monitor system.
Background technology
The safety of reservoir dam, not only affects the performance of project benefit, and directly threatens downstream the people's lives and property, once accident will produce loss and the impact that cannot estimate.Seepage abnormality is the major reason of dam accident, in dam infiltration, osmotic pressure monitoring problem will become the key subject of design, construction, operational management, the research and development life-span is long, precision is high, anti-lightning, can large-scale network-estabilishing Dam Osmotic Pressure Automatic Monitoring System be very important.At present, a little less than the dynamo-electric test macro ubiquity antijamming capability that most Dam Osmotic Pressure Automatic Monitoring System adopt, long-time stability are poor, and relative error, drift and moving floating compared with the shortcoming such as large are difficult to meet actual needs.
The anti-external interference poor ability of the bare optical fibers and bare optical gratings using of the fiber bragg grating pressure sensor of monitoring for Dam Osmotic Pressure Automatic at present, directly use it for the long durability requirement that Practical Project cannot meet extensive construction requirement and the field extreme environment of engineering structure, packaging technology and encapsulating structure to fiber-optic grating sensor are had higher requirement.Most of pressure transducer is all that fiber grating is imbedded in high molecular polymer or unorganic glass, drives fiber bragg grating center wavelength to change by the deformation of medium.Although its sensitivity all increases, there is corrosion-resistant, the easy fatal shortcoming such as aging in high molecular polymer, seriously restricts the performance of sensor endurance quality; And there is processing technology complexity in inorganic glass structure, the shortcoming that survival rate is low.
Utility model content
The utility model is in order to solve the anti-external interference ability of existing fiber grating pressure sensor, cause the problem of the permanance that cannot meet Practical Project construction requirement, thereby a kind of monitoring of the Dam Osmotic Pressure Automatic based on diaphragm type encapsulating structure fiber grating pressure sensor device is provided.
Fiber grating pressure sensor device is used in Dam Osmotic Pressure Automatic monitoring based on diaphragm type encapsulating structure, and it comprises wideband light source 1, wave filter 2, light intensity modulator 3, circulator 4, fiber coupler 5, a n pressure sensitive unit 6 and spectroanalysis instrument 7, and n is positive integer;
The light that wideband light source 1 sends is sent to light intensity modulator 3 after wave filter 2 filtering, the light signal output end of light intensity modulator 3 connects the first light signal input end of circulator 4, the first light signal output end of described circulator 4 connects the first light signal input end of fiber coupler 5, light signal after fiber coupler 5 couplings is divided into n road, and sends to respectively n pressure sensitive unit 6;
Fiber coupler 5 gathers the light signal that n pressure sensitive unit 6 is reflected back, the light signal output end of fiber coupler 5 connects the second light signal input end of circulator 4, and the second light signal output end of described circulator 4 connects the light signal input end of spectroanalysis instrument 7;
Each pressure sensitive unit 6 comprises pressure transducer and flat diaphragm, and flat diaphragm is for encapsulating pressure transducer.
The beneficial effects of the utility model: the utility model convergent light learns a skill with mechanical technique in one, Choice and process performance is good, have enough strength degrees, do not have remaining distortion, good temperature characterisitic, long-term use there is no variation, the good special alloy material of corrosion resistance for the stress of alternation, be easy to promote the use of, the anti-external interference ability that has improved fiber bragg grating pressure sensor, has improved 20% on year-on-year basis; The utility model has solved the long durability requirement of extensive construction requirement and the field extreme environment of engineering structure.
Brief description of the drawings
Fig. 1 is one-piece construction figure of the present utility model;
Fig. 2 is flat diaphragm structural drawing in pressure sensitive unit 6;
Fig. 3 is pressure and centre wavelength relation principle figure, and horizontal ordinate is pressure, and ordinate is wavelength;
Fig. 4 is that pressure and centre wavelength are related to experimental data figure, and ■ represents experimental data point, and dotted line represents the straight line after experimental data matching.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1, the monitoring of the Dam Osmotic Pressure Automatic based on diaphragm type encapsulating structure fiber grating pressure sensor device described in present embodiment, it comprises wideband light source 1, wave filter 2, light intensity modulator 3, circulator 4, fiber coupler 5, a n pressure sensitive unit 6 and spectroanalysis instrument 7, and n is positive integer;
The light that wideband light source 1 sends is sent to light intensity modulator 3 after wave filter 2 filtering, the light signal output end of light intensity modulator 3 connects the first light signal input end of circulator 4, the first light signal output end of described circulator 4 connects the first light signal input end of fiber coupler 5, light signal after fiber coupler 5 couplings is divided into n road, and sends to respectively n pressure sensitive unit 6;
Fiber coupler 5 gathers the light signal that n pressure sensitive unit 6 is reflected back, the light signal output end of fiber coupler 5 connects the second light signal input end of circulator 4, and the second light signal output end of described circulator 4 connects the light signal input end of spectroanalysis instrument 7;
Each pressure sensitive unit 6 comprises pressure transducer and flat diaphragm, and flat diaphragm is for encapsulating pressure transducer.
Pressure sensitive unit adopts fiber grating as sensing element, has corrosion-resistant, waterproof, anti-electromagnetic interference (EMI) and feature integrated, networking; Carry out monitoring pressure size by detection fiber raster center wavelength, there is high sensitivity; Pressure sensitive unit also adopts diaphragm as sensing element simultaneously, and size is little, can realize miniaturization; The encapsulating structure of pressure sensitive unit has solved the long durability requirement of extensive construction requirement and the field extreme environment of engineering structure; Be adapted at using in dam.
The light that wideband light source sends is after filter filtering, light signal is modulated by light intensity modulator, light signal after modulation enters circulator, light by circulator outgoing enters coupling mechanism, fiber coupler is distributed to multiple output the light signal of an input, send into respectively different pressure sensitive units, the light signal being reflected back by different pressure sensitive units is combined into an output by fiber coupler again, sends into spectroanalysis instrument and signal processing unit after circulator.Dam Osmotic Pressure Automatic monitoring fiber bragg grating pressure sensor based on diaphragm type encapsulating structure, utilization be circular sheet thin plate distortion while having pressure reduction in both sides, its center displacement is the most obvious.Utilizing in the variation of this center displacement reflection optic fiber grating wavelength is the feature of this sensor.Plane round metal diaphragm is center and the emphasis of whole design.It has directly determined sensitivity and the resolution of designed sensor.Based on the design theory of plane round metal diaphragm, determine the size of the diaphragm of the sensor of design.Diaphragm be a kind of can be at flexible the pressure-sensing device that direction moves perpendicular to it, it be a kind of medium that two pressure are not waited separately, there is flexible circular membrane.In the utility model, the flexible face of diaphragm is plane diaphragm, plane diaphragm is a special case of convoluted diaphragm, the encapsulating structure of the fiber-optic grating sensor based on plane diaphragm is that metallization pressure transducer is reliably connected with presser sensor plane diaphragm, to obtain good pressure transmission and signal conversion characteristic.
Embodiment two: present embodiment is further qualified with fiber grating pressure sensor device the monitoring of the Dam Osmotic Pressure Automatic based on diaphragm type encapsulating structure described in embodiment one, in present embodiment, it also comprises signal processing unit 8, and the light signal output end of described spectroanalysis instrument 7 connects the light signal output end of signal processing unit 8.
Embodiment three: present embodiment is further qualified with fiber grating pressure sensor device the monitoring of the Dam Osmotic Pressure Automatic based on diaphragm type encapsulating structure described in embodiment one, in present embodiment, the sweep limit of wideband light source 1 is greater than 1525nm and is less than 1565nm, Output optical power is 20mw, light power stabilising degree representative value is ± 0.02dB, output light isolation is 30dB, and output return loss is 45dB, and working temperature is greater than 0 DEG C and be less than 60 DEG C.
Embodiment four: present embodiment is further qualified with fiber grating pressure sensor device the monitoring of the Dam Osmotic Pressure Automatic based on diaphragm type encapsulating structure described in embodiment one, in present embodiment, spectroanalysis instrument 7 wavelength measurement scopes are greater than 1525nm and are less than 1565nm, wavelength resolution is 0.1pm, and wavelength accuracy is ± 1pm.
The working environment of the utility model simulation dam, as shown in Figure 2, adopting organic glass material to make is highly the graduated cylinder of 1500mm, and bottom is provided with water tap, be used for controlling height of water level, being prefabricated with least unit at the sidewall of graduated cylinder is that the scale of millimeter is for instruction liquid level directly perceived.Pressure transducer is placed into graduated cylinder bottom gently, by filled with water in graduated cylinder and by water tap draining, the respective value of the liquid level in control graduated cylinder in each calibration point of sensor.The light that light source sends arrives pressure transducer through coupling mechanism, detects the variation of the depth of water, and the wavelength reflected signal of fiber grating after coupling mechanism output, arrives (FBG) demodulator inter-process, the wavelength variations of reading fiber grating again.Draw central wavelength lambda
bas shown in Figure 3, empirical curve as shown in Figure 4 for the theoretical curve changing with pressure P.Within the scope of do experiment height of water level, the matched curve being drawn by experimental data is: λ
b=-3.21 (nm/MPa) P (MPa)+1531.468 (nm), i.e. real sensor sensitivity K=3.21nm/MPa.
Claims (4)
1. the monitoring of the Dam Osmotic Pressure Automatic based on diaphragm type encapsulating structure fiber grating pressure sensor device, it is characterized in that: it comprises wideband light source (1), wave filter (2), light intensity modulator (3), circulator (4), fiber coupler (5), a n pressure sensitive unit (6) and spectroanalysis instrument (7), and n is positive integer;
The light that wideband light source (1) sends is sent to light intensity modulator (3) after wave filter (2) filtering, the light signal output end of light intensity modulator (3) connects the first light signal input end of circulator (4), the first light signal output end of described circulator (4) connects the first light signal input end of fiber coupler (5), light signal after fiber coupler (5) coupling is divided into n road, and sends to respectively n pressure sensitive unit (6);
Fiber coupler (5) gathers the light signal that n pressure sensitive unit (6) is reflected back, the light signal output end of fiber coupler (5) connects the second light signal input end of circulator (4), and the second light signal output end of described circulator (4) connects the light signal input end of spectroanalysis instrument (7);
Each pressure sensitive unit (6) comprises pressure transducer and flat diaphragm, and flat diaphragm is for encapsulating pressure transducer.
2. the monitoring of the Dam Osmotic Pressure Automatic based on diaphragm type encapsulating structure fiber grating pressure sensor device according to claim 1, it is characterized in that: it also comprises signal processing unit (8), the light signal output end of described spectroanalysis instrument (7) connects the light signal output end of signal processing unit (8).
3. the monitoring of the Dam Osmotic Pressure Automatic based on diaphragm type encapsulating structure fiber grating pressure sensor device according to claim 1, it is characterized in that: the sweep limit of wideband light source (1) is greater than 1525nm and is less than 1565nm, Output optical power is 20mw, light power stabilising degree representative value is ± 0.02dB, output light isolation is 30dB, output return loss is 45dB, and working temperature is greater than 0 DEG C and be less than 60 DEG C.
4. the monitoring of the Dam Osmotic Pressure Automatic based on diaphragm type encapsulating structure fiber grating pressure sensor device according to claim 1, it is characterized in that: spectroanalysis instrument (7) wavelength measurement scope is greater than 1525nm and is less than 1565nm, wavelength resolution is 0.1pm, and wavelength accuracy is ± 1pm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420258751.9U CN203811318U (en) | 2014-05-20 | 2014-05-20 | Fiber-bragg grating pressure sensor used for dam osmotic pressure monitoring based on diaphragm-type packaging structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420258751.9U CN203811318U (en) | 2014-05-20 | 2014-05-20 | Fiber-bragg grating pressure sensor used for dam osmotic pressure monitoring based on diaphragm-type packaging structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105955330A (en) * | 2014-12-04 | 2016-09-21 | 熊达煜 | Automatic control dam water pressure detection device and monitoring method thereof |
| CN106153225A (en) * | 2016-06-28 | 2016-11-23 | 南京师范大学 | Fiber Bragg Grating FBG transverse pressure sensing system based on microwave photon filter and measuring method |
| CN110296788A (en) * | 2019-06-28 | 2019-10-01 | 金华职业技术学院 | A kind of container fluid pressure measurement method |
-
2014
- 2014-05-20 CN CN201420258751.9U patent/CN203811318U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105955330A (en) * | 2014-12-04 | 2016-09-21 | 熊达煜 | Automatic control dam water pressure detection device and monitoring method thereof |
| CN105955330B (en) * | 2014-12-04 | 2018-09-25 | 齐齐哈尔市水利勘测设计研究院有限责任公司 | One kind automatically controlling dam hydraulic pressure force checking device and its monitoring method |
| CN106153225A (en) * | 2016-06-28 | 2016-11-23 | 南京师范大学 | Fiber Bragg Grating FBG transverse pressure sensing system based on microwave photon filter and measuring method |
| CN106153225B (en) * | 2016-06-28 | 2018-11-16 | 南京师范大学 | A kind of fiber bragg grating transverse pressure sensing system and measurement method |
| CN110296788A (en) * | 2019-06-28 | 2019-10-01 | 金华职业技术学院 | A kind of container fluid pressure measurement method |
| CN110296788B (en) * | 2019-06-28 | 2024-03-22 | 金华职业技术学院 | Method for measuring fluid pressure in container |
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Granted publication date: 20140903 Termination date: 20150520 |
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| EXPY | Termination of patent right or utility model |