CN105136279A - Insertion-free couplant-free elastic wave detector - Google Patents
Insertion-free couplant-free elastic wave detector Download PDFInfo
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- CN105136279A CN105136279A CN201510668322.8A CN201510668322A CN105136279A CN 105136279 A CN105136279 A CN 105136279A CN 201510668322 A CN201510668322 A CN 201510668322A CN 105136279 A CN105136279 A CN 105136279A
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- elastic wave
- electret capacitor
- capacitor array
- electret
- array
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Abstract
The invention discloses an insertion-free couplant-free elastic wave detector. Multiple electret capacitors are used to form an array to serve as an elastic wave sensing part to convert the elastic wave into an electric signal, and an amplifying circuit is used for amplifying a weak electric signal. The electret capacitor array is placed annularly, that is, when the overall device in any shape makes contact with a detected object, the electret capacitor array has the consistent elastic wave sensing ability. The elastic wave propagated in the detected object passes through the interface between the object and the air, the elastic wave continues to be propagated in the air, and when the elastic wave propagated in the air arrives at the electret capacitor array, capacitance of the electret capacitor is caused to change. The change of the capacitance causes voltage and current at two ends of the capacitor to change to further generate an AC electric signal. After amplified by the amplifying circuit, the electric signal can be recorded by recording equipment. With the help of the air medium, the elastic wave propagated in the detected object can be recorded.
Description
Technical field
The present invention relates to a kind of elastic wave receiving trap, be applied to physical prospecting and field of non destructive testing.
Background technology
At present, in physical prospecting field, field of non destructive testing carries out wave velocity method work, all uses wave detector as the receiving trap of elastic wave.Wave detector is a kind of device faint mechanical oscillation signal being converted into electric signal.Wave detector divides according to principle and mainly contains moving-coil class and piezoelectric type.Moving-coil class wave detector uses the electromagnetic induction principle of coil cutting magnetic induction line generation current.Piezoelectric type wave detector utilizes piezoelectric crystal to produce the characteristic of electric charge when being subject to ambient pressure.The principle of known wave detector determines wave detector must by inserting or using the mode of couplant to complete the conversion receiver of elastic wave.In practical application, the centrum of wave detector must be inserted below ground when settling wave detector, or use the mode of the couplants such as quickstick powder, gesso, butter, mud that wave detector and object to be detected are closely pasted mutually to be coupled.
Along with increasing of the underground engineering construction such as subway construction, pipeline construction in city, the cavity of Urban Underground, the potential safety hazard such as loose get more and more, be badly in need of there are a kind of means fast and effectively to realize the generaI investigation of potential safety hazard, and provide foundation for follow-up control.In city, the requirement degree of depth of underground goal in research reaches 30 meters, and the physical prospecting equipment such as geological radar, pipeline instrument are helpless.By the impact of humanity activities, vehicle, electric wire etc. in city, the geophysical prospecting method of electricity, magnetic class is difficult to obtain good Effect on Detecting.Wave velocity method must be used to complete research, the detection of this degree of depth.Wave velocity method (seismic method) has achieved good effect in Coal Geophysical, petroleum exploration etc., and its investigation depth is large, precision is high.
Cannot assign wave detector under the hard surface conditions such as municipal highway, wave detector must insert or use couplant to limit application wave velocity method to carry out the efficiency exploring and detect, make the range of application of wave velocity method be restricted simultaneously.
Summary of the invention
For overcoming the restriction that wave detector must insert or use couplant to use, invent this wave detector.
The invention provides one exempt from insert exempt from couplant elastic wave wave detector.The present invention uses multiple electret capacitor to form array and changes elastic wave into electric signal as elastic wave inductive means, uses amplifying circuit to amplify ultra-weak electronic signal.Electret capacitor array is laid in the form of a ring, and when namely any form of whole device and object to be detected contact and place, the sensing capability of electret capacitor array to elastic wave is consistent.The elastic wave propagated in object to be detected, propagating in air by the interface of object and air follow-up continuing, causes the electric capacitance change of electret capacitor when the elastic wave propagated in atmosphere arrives electret capacitor array.The change of electric capacity causes the change of capacitor voltage at both ends and electric current thus produces alternate electrical signal, can be recorded equipment and record after this electric signal is amplified by amplifying circuit.By air dielectric, the present invention can be recorded to the elastic wave propagated in object to be detected.
The present invention changes the working method that wave detector must insert ground, eliminate the use of the couplants such as quickstick powder, gesso, butter, mud, improve the work efficiency of wave velocity method, in city hard surface condition under carry out wave velocity method and provide instrument.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is embodiment vertical axis diagrammatic cross-section
In figure: 1, electret capacitor, 2, fixed support, 3, amplifying circuit, 4, protecting sheathing, 5, recording unit.
Embodiment
As figure, electret capacitor 1 totally 5, fixed support 2 cross section is regular pentagon, respectively on each of fixed support 2 fixes an electret capacitor 1, and each electret capacitor 1 uses wired in series to form a whole access amplifying circuit 3 together.All connect at electret capacitor 1, fixed support 2, amplifying circuit 3, fixedly complete after entirety put into circular tube shaped protecting sheathing 4.Protecting sheathing 4 is identical with the distance of each electret capacitor 1.Whole device be positioned on ground or object to be detected on the surface, protecting sheathing 4 contacts with ground or object to be detected or apart from minimum.Elastic wave is propagated in underground or air, protecting sheathing 4, air, electret capacitor 1 between protecting sheathing 4 and electret capacitor between object to be detected, underground or object to be detected and protecting sheathing 4 successively; the elastic wave propagated in underground or object to be detected is finally transmitted to electret capacitor 1; the electric capacity of electret capacitor 1 is caused to change; thus export the alternate electrical signal relevant to elastic wave at amplifying circuit 3 output terminal, use recording unit 5 to record the object that this alternate electrical signal realizes observational record elastic wave.
Claims (3)
1. one kind exempt from insert exempt from couplant wave detector, comprise elastic wave and be converted to electric signaling device, it is characterized in that using multiple electret capacitor to form array changes elastic wave into electric signal as elastic wave inductive means, amplifying circuit is used to amplify ultra-weak electronic signal, described electret capacitor array is laid in the form of a ring, when any form of described ring-type electret capacitor array is placed electret capacitor array in object to be detected or the sensing capability of the elastic wave of underground propagation be consistent.
2. require that described electret capacitor array is series connection or rear access amplifying circuit in parallel according to right 1, the performance of the different electret capacitors of composition electret capacitor array is consistent.
3. require described electret capacitor array according to right 1, the electret capacitor quantity of composition array is no less than any amount of 3, and the laying bracket cross sectional shape of electret capacitor array is the regular polygon matched with electret capacitor quantity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510668322.8A CN105136279A (en) | 2015-10-17 | 2015-10-17 | Insertion-free couplant-free elastic wave detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510668322.8A CN105136279A (en) | 2015-10-17 | 2015-10-17 | Insertion-free couplant-free elastic wave detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105136279A true CN105136279A (en) | 2015-12-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510668322.8A Pending CN105136279A (en) | 2015-10-17 | 2015-10-17 | Insertion-free couplant-free elastic wave detector |
Country Status (1)
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005210738A (en) * | 2004-01-08 | 2005-08-04 | Schlumberger Technology Bv | Acoustic transducer for tubular |
| CN101042437A (en) * | 2006-11-30 | 2007-09-26 | 中国石油天然气集团公司 | Seismic prospecting method between azimuth borehole |
| CN201247323Y (en) * | 2008-08-29 | 2009-05-27 | 北京市市政工程研究院 | Multi-component earthquake wave space receiving device |
| US20140254318A1 (en) * | 2013-03-08 | 2014-09-11 | Cgg Services Sa | Buried hydrophone with solid or semi-rigid coupling |
| CN104570058A (en) * | 2014-12-26 | 2015-04-29 | 深圳市微纳集成电路与系统应用研究院 | Impending earthquake monitoring probe structure based on multiple sensors |
| CN205157039U (en) * | 2015-10-17 | 2016-04-13 | 北京普飞航地科技有限公司 | Exempt from to insert and exempt from couplant elastic wave wave detector |
-
2015
- 2015-10-17 CN CN201510668322.8A patent/CN105136279A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005210738A (en) * | 2004-01-08 | 2005-08-04 | Schlumberger Technology Bv | Acoustic transducer for tubular |
| CN101042437A (en) * | 2006-11-30 | 2007-09-26 | 中国石油天然气集团公司 | Seismic prospecting method between azimuth borehole |
| CN201247323Y (en) * | 2008-08-29 | 2009-05-27 | 北京市市政工程研究院 | Multi-component earthquake wave space receiving device |
| US20140254318A1 (en) * | 2013-03-08 | 2014-09-11 | Cgg Services Sa | Buried hydrophone with solid or semi-rigid coupling |
| CN104570058A (en) * | 2014-12-26 | 2015-04-29 | 深圳市微纳集成电路与系统应用研究院 | Impending earthquake monitoring probe structure based on multiple sensors |
| CN205157039U (en) * | 2015-10-17 | 2016-04-13 | 北京普飞航地科技有限公司 | Exempt from to insert and exempt from couplant elastic wave wave detector |
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Application publication date: 20151209 |
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| WD01 | Invention patent application deemed withdrawn after publication |