CN203571440U - Surface acoustic wave pressure sensor for oil pipeline leakage detection system - Google Patents
Surface acoustic wave pressure sensor for oil pipeline leakage detection system Download PDFInfo
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- CN203571440U CN203571440U CN201320652138.0U CN201320652138U CN203571440U CN 203571440 U CN203571440 U CN 203571440U CN 201320652138 U CN201320652138 U CN 201320652138U CN 203571440 U CN203571440 U CN 203571440U
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- interdigital
- acoustic wave
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- surface acoustic
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Abstract
The utility model relates to a surface acoustic wave pressure sensor for an oil pipeline leakage detection system. A sensor chip is formed by surface acoustic wave (SAW) harmonic oscillators symmetrically arranged on the upper surface and the lower surface of a piezoelectric base. A hydraulic cavity is rectangular, a round groove is formed in the bottom surface of the hydraulic cavity, and a plurality of holes communicated with the round groove are formed in the hydraulic cavity. The sensor chip is embedded into an empty groove of a pressure-sensitive material which is embedded into the round groove in the hydraulic cavity which is formed in a casing, a circuit board with screws are fixed on the casing and connected with the two SAW harmonic oscillators of the sensor chip, the casing is arranged in a rubber sleeve with a sucker, and antennas are in threaded connection with the screws of the circuit board. The two SAW harmonic oscillators in the surface acoustic wave pressure sensor adopt laterally-zygomorphic difference structure modes, influences of other environemtal factors are eliminated, and real-time monitoring on oil pipelines is achieved. The surface acoustic wave pressure sensor for the oil pipeline leakage detection system has the advantages of being low in cost, high in sensitivity, small in size, passive and wireless, and the like, and is applicable to telemetering and sensing in severe environments.
Description
Technical field
The utility model relates to a kind of surface acoustic wave transducer, particularly a kind of surface acoustic wave pressure sensor for Oil Pipeline Leakage Detecting System.
Background technique
Leakage is the major failure of oil transport pipeline operation.In recent years, be perforated stolen and corrosion failure of oil transport pipeline causes leakage accident to occur repeatedly, severe jamming normal production, caused huge economic loss.China's oil transport pipeline is built like a raging fire, but only 3.5 ten thousand kilometers of existing large-scale oil transport pipeline overall lengths, expert estimates, coming 10 years China all utilizes pipeline to carry product oils such as realizing gasoline, diesel oil, kerosene, all want every year on average newly-built 20,000 kilometers of all kinds of conveyance conduits, China's oil transport pipeline construction will welcome new climax, and therefore, the research of Oil Pipeline Leakage Detecting System and application become oil field problem demanding prompt solution.
The method of conventional sense pipe leakage has artificial line walking, pipe interior detection technique and pipeline external dynamic detection technology etc., and these methods are not only vulnerable to external environment influence, and cost compare is high.
Summary of the invention
In view of above-mentioned prior art present situation, the utility model provides a kind of surface acoustic wave pressure sensor for Oil Pipeline Leakage Detecting System, utilize surface acoustic wave techniques to detect the scheme that pipeline is revealed, be a kind of the have peculiar high frequency characteristics of Acoustic Surface Wave (SAW) pressure transducer of higher sensitivity and piezoelectricity, inverse piezoelectric effect of device substrate material, detect the leakage of oil transport pipeline, greatly improve the monitoring capability to oil transport pipeline, avoided serious economic loss.
Technical solution adopted in the utility model is: a kind of surface acoustic wave pressure sensor for Oil Pipeline Leakage Detecting System, is characterized in that: comprise antenna, nut, circuit board, gum cover, housing, sensor chip, pressure sensitive, hydraulic pressure cavity; Described sensor chip consists of the SAW resonator being symmetricly set on piezoelectric substrate top and bottom; Described hydraulic pressure cavity is rectangle, in the bottom surface of hydraulic pressure cavity, is provided with circular groove, is provided with several holes that communicate with circular groove on hydraulic pressure cavity; Described sensor chip is embedded in the dead slot of pressure sensitive, described pressure sensitive is embedded in the circular groove of hydraulic pressure cavity, described hydraulic pressure cavity is arranged in housing, the circuit board that screw is installed is fixed on housing and is connected with two SAW resonators of sensor chip respectively, described housing is arranged on to be with in suctorial gum cover, and described antenna is spirally connected by the screw of nut and circuit board.
The beneficial effect that the utility model produces is: two SAW resonators in Acoustic Surface Wave (SAW) pressure transducer, adopted laterally zygomorphic differential configuration mode, eliminated the impact of other environmental factors, can realize the Real-Time Monitoring to oil transport pipeline, compare with conventional pressure sensor, there is the advantages such as cost is low, highly sensitive, volume is little, passive and wireless, be applicable to remote measurement and sensing under rugged environment.
This structure can also be for various liquid monitorings field, as association areas such as blood pressure, hydraulic pressure.
Accompanying drawing explanation
Fig. 1 is the utility model overall structure schematic diagram;
Fig. 2 is the utility model STRUCTURE DECOMPOSITION schematic diagram;
Fig. 3 is the structural representation of SAW resonator in the utility model;
Fig. 4 is the A-A sectional side view of Fig. 3;
Fig. 5 is the connection diagram of sensor and antenna in the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figures 1 to 5, a kind of surface acoustic wave pressure sensor for Oil Pipeline Leakage Detecting System, comprises antenna 1, nut 2, circuit board 3, gum cover 4, housing 5, sensor chip 6, pressure sensitive 7, hydraulic pressure cavity 8.Hydraulic pressure cavity 8 is rectangle, in the bottom surface of hydraulic pressure cavity 8, is provided with circular groove 8-1, is provided with several hole 8-2 that communicate with circular groove 8-1 on hydraulic pressure cavity 8.Sensor chip 6 comprises piezoelectric substrate 6-1 and SAW resonator 6-2, adopts the method for electron beam evaporation plating to be plated in the symmetrical position of piezoelectric substrate 6-1 upper and lower surface the SAW resonator 6-2 structure designing.Sensor chip 6 is embedded in the dead slot 7-1 of pressure sensitive 7 and fuses together, pressure sensitive 7 is embedded in to drive fit in the circular groove 8-1 of hydraulic pressure cavity 8, hydraulic pressure cavity 8 is arranged in housing 5, the circuit board 3 that screw 3-1 is installed is fixed by screws in the side of housing 5, with circuit board 3 contact I3-1, two wires that contact II3-2 connects are connected with two SAW resonator 6-2 of sensor chip 6 respectively by the through hole 5-1 of housing 5 sides, wherein contact I3-1 is connected with ground, contact II3-2 is connected with antenna, realize wireless transmission function, housing 5 is arranged in the gum cover 4 with sucker 4-1, one end of one end of antenna 1 and nut 2 is screwed together, the screw 3-1 of the other end of nut 2 and circuit board 3 is screwed together, antenna 1 is connected with circuit board 3 with screw 3-1 by nut 2.
Two SAW resonator 6-2 structures that are arranged on piezoelectric substrate 6-1 are identical, SAW resonator 6-2 consists of interdigital transducer 6-21 and reflecting grating 6-22, the structure that its interdigital transducer 6-21 and reflecting grating 6-22 arrange is, on the face of piezoelectric substrate 6-1, level is provided with two reflecting grating 6-22, between two described reflecting grating 6-22, is provided with interdigital transducer 6-21.Piezoelectric substrate 6-1 adopts AT to cut quartz.
Interdigital transducer 6-21 comprises with bus electrode 6-21-1 one end and is made as the solder joint 6-21-2 of one and is made as several hollow interdigital 6-21-3 of one with the bus electrode 6-21-1 the other end, article two, bus electrode 6-21-1 is symmetrical arranged, and several the hollow interdigital 6-21-3 on two bus electrode 6-21-1 arrange fork; The upper adjacent different hollow interdigital 6-21-3 of two polarity of every bus electrode 6-21-1 has formed a pair of interdigital, and a pair of interdigital width P=7.2 μ m, is interval with four short-circuiting bar 6-21-4 in every hollow interdigital 6-21-3; Hollow interdigital 6-21-3 finger beam a is 1.8 μ m, the spacing b of hollow interdigital 6-21-3 is 1.8 μ m, hollow interdigital 6-21-3 hollow parts width c is a/3=0.6 μ m, several hollow interdigital 6-21-3 are that aperture W1 is 180 μ m to pitching rear upper and lower hollow interdigital 6-21-3 lap, and the thickness h of hollow interdigital 6-21-3 is 0.25 μ m.Hollow interdigital 6-21-3 logarithm N1 is 200 pairs.
Reflecting grating 6-22 is included in several reflection grizzly bars 6-22-2 being provided with between two short circuit grizzly bar 6-22-1, article two, short circuit grizzly bar 6-22-1 and several reflection grizzly bars 6-22-2 are structure as a whole, reflection grizzly bar 6-22-2 width d is 1.8 μ m, reflection grizzly bar 6-22-2 spacing e is 1.8 μ m, the length W2=300 μ m of reflection grizzly bar, the thickness h=0.25 μ m of reflection grizzly bar 6-22-2.The number N2 of reflection grizzly bar is 300.The resonant frequency of interdigital transducer is 437.65MHz.
In order to improve the performance index of sensor, the utility model adopts hollow interdigital structure, it is that interdigital electrode core is hollowed out, in order to improve device photoetching yield rate, in hollow interdigital 6-21-3, be provided with four short-circuiting bar 6-21-4, reflection and three strokes impact on device performance between such structure can reduce to refer to.
In order to make sensor have high quality factor and low insertion loss, SAW resonator 6-2 has adopted single-ended resonant mode.
In order to eliminate the impact of other environmental factors on sensor, two duplicate SAW resonator 6-2 have been put in same position at the upper and lower surface of piezoelectric substrate 6-1, one is under pressure, and one is subject to tension force, and such differential configuration can improve tonometric validity.Sensing unit is crossed antenna transmission to acquisition terminal by the frequency change information exchange being caused by pressure, carries out signal processing, finally obtains the changing value of hydraulic pressure.
In actual applications, sensor makes total can be fixed on oil transport pipeline inner bottom part by sucker 4-1.In oil transport pipeline, oil flows into hydraulic pressure cavity 8 by hydraulic pressure cavity 8 several hole 8-2 above, the pressure that now the interior oil of hydraulic pressure cavity 8 produces is directly passed to pressure sensitive 7, cause that deformation occurs sensitive material 7, cause immediately the deformation with the piezoelectric substrate 6-1 of its close contact, wherein the size of deformation and the pressure of liquid become certain proportionate relationship, and the deformation of sensor piezoelectric substrate 6-1 will cause metal gates spacing and Acoustic Surface Wave velocity of wave to change, finally caused the variation of resonator CF center frequency, therefore, by measuring resonator CF center frequency
variation just can measure the pressure of liquid.Oil transport pipeline is under normal operating condition, pipeline input and output flow should equate, now being positioned at the pressure that the SAW sensor 6-2 of diverse location records should be consistent, when oil transport pipeline occurs to leak, certainly lead to difference in flow, in the situation that the flow of upstream pumping unit remains unchanged, the flow of downstream pump station reduces, brought the variation of the pressure that the SAW sensor 6-2 of downstream pump station records in real time thereupon, can according to the situation of change of contrast two place's pressure, determine whether to occur leakage and the severity leaking, if two sensors distance is closer, can be to occurring that the position of leaking positions.
SAW sensor chip in this structure is positioned at total inside, unless whole sensor is destroyed, can guarantee the safety of SAW sensor chip, has further guaranteed its working life and reusability.
Claims (7)
1. for a surface acoustic wave pressure sensor for Oil Pipeline Leakage Detecting System, it is characterized in that: comprise antenna (1), nut (2), circuit board (3), gum cover (4), housing (5), sensor chip (6), pressure sensitive (7), hydraulic pressure cavity (8); Described sensor chip (6) consists of the SAW resonator (6-2) being symmetricly set on piezoelectric substrate (6-1) top and bottom; Described hydraulic pressure cavity (8) is rectangle, in the bottom surface of hydraulic pressure cavity (8), is provided with circular groove (8-1), is provided with several holes (8-2) that communicate with circular groove (8-1) on hydraulic pressure cavity (8); Described sensor chip (6) is embedded in the dead slot (7-1) of pressure sensitive (7), described pressure sensitive (7) is embedded in the circular groove (8-1) of hydraulic pressure cavity (8), described hydraulic pressure cavity (8) is arranged in housing (5), the circuit board (3) that screw (3-1) is installed is fixed on housing (5) above and is connected with two SAW resonators (6-2) of sensor chip (6) respectively, described housing (5) is arranged in the gum cover (4) with sucker (4-1), and described antenna (1) is spirally connected by nut (2) and the screw (3-1) of circuit board (3).
2. a kind of surface acoustic wave pressure sensor for Oil Pipeline Leakage Detecting System according to claim 1, it is characterized in that: described in two SAW resonators (6-2) structure of being arranged in piezoelectric substrate (6-1) identical, SAW resonator (6-2) consists of interdigital transducer (6-21) and reflecting grating (6-22), the structure that its interdigital transducer (6-21) and reflecting grating (6-22) arrange is, on the face of described piezoelectric substrate (6-1), level is provided with two reflecting gratings (6-22), between two described reflecting gratings (6-22), be provided with interdigital transducer (6-21).
3. a kind of surface acoustic wave pressure sensor for Oil Pipeline Leakage Detecting System according to claim 1 and 2, is characterized in that: described piezoelectric substrate (6-1) adopts AT to cut quartz.
4. a kind of surface acoustic wave pressure sensor for Oil Pipeline Leakage Detecting System according to claim 2, it is characterized in that: described interdigital transducer (6-21) comprises with bus electrode (6-21-1) one end and is made as the solder joint (6-21-2) of one and is made as one several hollow interdigital (6-21-3) with bus electrode (6-21-1) the other end, article two, bus electrode (6-21-1) is symmetrical arranged, and several hollow interdigital (6-21-3) on two bus electrodes (6-21-1) arrange fork, upper adjacent different hollow interdigital (6-21-3) of two polarity of every bus electrode (6-21-1) formed a pair of interdigital, a pair of interdigital width P=7.2 μ m, in every hollow interdigital (6-21-3), be interval with four short-circuiting bars (6-21-4), described hollow interdigital (6-21-3) finger beam a is 1.8 μ m, the spacing b of hollow interdigital (6-21-3) is 1.8 μ m, hollow interdigital (6-21-3) hollow parts width c is a/3=0.6 μ m, several hollow interdigital (6-21-3) are that aperture W1 is 180 μ m to pitching rear upper and lower hollow interdigital (6-21-3) lap, the thickness h of hollow interdigital (6-21-3) is 0.25 μ m.
5. a kind of surface acoustic wave pressure sensor for Oil Pipeline Leakage Detecting System according to claim 4, is characterized in that: described hollow interdigital (6-21-3) logarithm N1 is 200 pairs.
6. a kind of surface acoustic wave pressure sensor for Oil Pipeline Leakage Detecting System according to claim 2, it is characterized in that: described reflecting grating (6-22) is included in several reflection grizzly bars (6-22-2) that are provided with between two short circuit grizzly bars (6-22-1), article two, short circuit grizzly bar (6-22-1) and several reflection grizzly bars (6-22-2) are structure as a whole, described reflection grizzly bar (6-22-2) width d is 1.8 μ m, reflection grizzly bar (6-22-2) spacing e is 1.8 μ m, the length W2=300 μ m of reflection grizzly bar, thickness h=0.25 μ the m of reflection grizzly bar (6-22-2).
7. a kind of surface acoustic wave pressure sensor for Oil Pipeline Leakage Detecting System according to claim 5, is characterized in that: the number N2 of described reflection grizzly bar (6-22-2) is 300.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320652138.0U CN203571440U (en) | 2013-10-22 | 2013-10-22 | Surface acoustic wave pressure sensor for oil pipeline leakage detection system |
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| CN201320652138.0U CN203571440U (en) | 2013-10-22 | 2013-10-22 | Surface acoustic wave pressure sensor for oil pipeline leakage detection system |
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| CN203571440U true CN203571440U (en) | 2014-04-30 |
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| CN201320652138.0U Withdrawn - After Issue CN203571440U (en) | 2013-10-22 | 2013-10-22 | Surface acoustic wave pressure sensor for oil pipeline leakage detection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103499024A (en) * | 2013-10-22 | 2014-01-08 | 天津七一二通信广播有限公司 | Surface acoustic wave pressure sensor for oil pipeline leak detection system |
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- 2013-10-22 CN CN201320652138.0U patent/CN203571440U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103499024A (en) * | 2013-10-22 | 2014-01-08 | 天津七一二通信广播有限公司 | Surface acoustic wave pressure sensor for oil pipeline leak detection system |
| CN103499024B (en) * | 2013-10-22 | 2015-11-25 | 天津七一二通信广播有限公司 | A kind of surface acoustic wave pressure sensor for Oil Pipeline Leakage Detecting System |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140430 Effective date of abandoning: 20151125 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |