CN1512819A - Underground sound sensitive sensor - Google Patents
Underground sound sensitive sensor Download PDFInfo
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- CN1512819A CN1512819A CNA02159452XA CN02159452A CN1512819A CN 1512819 A CN1512819 A CN 1512819A CN A02159452X A CNA02159452X A CN A02159452XA CN 02159452 A CN02159452 A CN 02159452A CN 1512819 A CN1512819 A CN 1512819A
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Abstract
An underground sound sensitive transducer is composed of a physical resonant cavity, a resonant plate, a nose-spike, a piezoelectric plate, an electric signal amplifier, wires, a circuit box and an audio signal output terminal, among which, the resonant plate is set on top of the cavity with a nose-spike on the plate center, the peak is connected with the piezoelectric plate fixed in the cavity by wires in four directions, positive and negative of the plate are connected with the signal input and earth of the signal amplier set in the circuit box at the bottom of the resonant cavity and an audio signal output end. The transducer can be buried at 20cm underground and picks up weak sound signals(surface 20m) (underground 30m) to be amplified and output in an analog signal.
Description
＜one〉technical field:
The present invention is a kind of underground acoustic sensor, belongs to security precautions technology equipment.
＜two〉background technology:
Open-air safety technological guard difficulty maximum be disguise and anti-destructive, existing security protection equipment is subjected to the restriction of above-mentioned factor, can't use.Conventional sound-detection gear relies on air borne, and well-known, sound wave is a kind of compressional wave in air, and at this moment the direction of vibration of medium particle is corresponding to the direction of transfer of sound wave.Sound will produce phenomenons such as reflection, refraction and diffraction in the air, and cause decay in the air.These decay generally include acoustic energy with distance disperse and propagate the decay Aa that the decay Ad cause and absorption of air cause, ground absorbs the decay Ag that causes, the decay Am that decay Ab that barrier causes and meteorological condition cause etc.Total decay A then is the summation of various decay: A=Ad+Aa+Ag+Ab+Am.The sound barrier decay underground as it is embedded in, that the stratum constitutes, ground absorbs in addition, can't hear face of land sound.We can analyze like this, Fig. 1, are embedded in underground schematic diagram for conventional space pick-up, and sound wave arrives ground, passes the stratum and is transmitted to pick-up.Because pick-up is media by air vibration, thus can only receive transmitted wave, and transmitted wave in the acoustic pressure of stratum and pick-up with the acoustic pressure ratio of incident wave on the ground surface and interface is:
According to transaudient damage
-----------------------------------------Shi (2)
Wherein
Usually the characteristic impedance on stratum is much larger than the air characteristics impedance, again the mass law of sound transmission loss:
Show: the common logarithm of the quality of sound transmission loss amount and unit are is proportional.The mass area ratio on stratum is big more, and the sound transmission loss amount is just big more, and m doubles, and the sound transmission loss amount increases 6dB, and formula (4) is also represented: frequency is high more, and the sound transmission loss amount is just big more, and frequency doubles, and the acoustic loss amount also increases 6dB.ω in the formula=2 π f, ρ c is airborne characteristic impedance ≈ 400.Formula (4) also can be expressed as:
TL＝20lgm+20lgf-42.5--------------------------------(5)
Following formula is the Theoretical Calculation result of sound wave vertical incidence.When the irregular incident of sound wave, then tackle all incidence angles and ask on average, empirical equation, transaudient attenuation is:
TL＝18.5lgmf-47.5-----------------------------------(6)
This shows that the space pick-up is embedded in underground, the sound intensity that receives is very faint.
In order to overcome above-mentioned deficiency, the objective of the invention is: a kind of underground acoustic sensor is provided, it adopts the physics resonant cavity, receiving plane and ground are combined together, be considered as same interface, rely on solid vibration propagation energy, owing in solid is propagated, both there had been the compressional wave of sound wave, also have shear wave, Propagation of Energy is much larger than air, and just the solid-borne sound transmission of often saying has characteristics such as propagation velocity is fast, decay is few.Underground 20cm place can detect in the radius 20m of the face of land this underground acoustic sensor and underground 30m or farther faint voice signal imbedding.Succeeding in developing of this transducer is for open-air safety precaution field provides effective technical means.
＜three〉summary of the invention:
A kind of underground acoustic sensor of the present invention, it is made up of physics resonant cavity 1, resonance piece 2, thimble 3, piezoelectric ceramic piece 4, electric signal amplifier 5, lead 6, circuit box 7 and audio signal output end 8.
This physics resonant cavity 1 is cylindrical stainless steel cylinder, end face at physics resonant cavity 1 is provided with resonance piece 2, central part at resonance piece 2 welds a thimble 3, the tip of this thimble 3 contacts with piezoelectric ceramic piece 4, this piezoelectric ceramic piece 4 is fixed in the physics resonant cavity 1 from four direction by steel wire, the positive and negative electrode of this piezoelectric ceramic piece 4 joins by the signal input part and the ground end of two leads 6 with electric signal amplifier 5, this electric signal amplifier 5 places in the circuit box 7, circuit box 7 is arranged on this physics resonant cavity bottom, is provided with audio signal output end 8 on circuit box 7.
Wherein, the circuit of this electric signal amplifier 5 is made up of field effect transistor ZSK30A, triode ZSA733, amplifier NE5532, resistance R 1～R10, capacitor C 1～C7; Its annexation is: input IN connects an end of capacitor C 1, the other end of capacitor C 1 connects an end of resistance R 1, the G end of field effect transistor ZSK30A, the D end of field effect transistor ZSK30A connects the base stage b end of triode ZSA733, an end that connects resistance R 2, the other end of resistance R 2 connects an end of resistance R 5, the positive pole of capacitor C 2, the minus earth of capacitor C 2, the S end of field effect transistor ZSK30A connects an end of resistance R 3, the positive pole of capacitor C 3, one end of the negative pole of the other end of resistance R 3 and capacitor C 3 and resistance R 6, one end of resistance R 4, one end of resistance R 1 is connected, the other end ground connection of resistance R 4, the emitter e utmost point of triode ZSA733 connects an end of resistance R 7 and the negative pole of capacitor C 4, the other end of resistance R 7 links to each other with the positive pole of capacitor C 4, and connect 8 ends that power supply 12V connects amplifier NE5532 simultaneously, the collector electrode C utmost point of triode ZSA733 is the positive pole that connects capacitor C 5, one end of resistance R 8, the in-phase input end 3 of amplifier NE5532, the negative pole of capacitor C 5 connects the other end of resistance R 6, the other end of resistance R 8 connects ground, be connected in series a resistance R 9 between the inverting input 2 and 1 of amplifier NE5532, its 4 end is connected with ground, one end of resistance R 9 is connected with resistance R 10, the other end of R10 links to each other with the positive pole of capacitor C 6, the negative pole of capacitor C 6 is connected with ground, 1 end of amplifier NE5532 is connected with 5 ends, 6 ends are connected with 7 ends, 7 ends connect the positive pole of capacitor C 7, and the negative pole of C7 is output OUT.
A kind of underground acoustic sensor of the present invention, its advantage is: the propagation speed of sound is fast, decay is few, and highly sensitive, the transmission of its sound wave is to come Propagation of Energy by the momentum transfer between adjacent particle.When sound wave incides ground, when the momentum transfer by adjacent particle caused the resonance piece vibration, the Fi of resonance piece each point arrived piezoelectric patches by thimble, and the stressed FM that piezoelectric patches M order is: the vector that each point is delivered to needle point with, be formulated as
F
M=∑ Fi------------------------------------formula [7]
This shows, though arrive the sound on the face of land or the sound that transmits by the stratum very faint, behind resonant cavity, obtain amplifying, the signal of telecommunication of piezoelectric patches output after amplifier amplifies, output.This invents described device, improves thousands of times approximately than the sensitivity of conventional piezoelectric type resonance pickup.
＜four〉description of drawings:
The conventional space of Fig. 1 pick-up is embedded in underground schematic diagram.
Fig. 2 perspective exploded view of the present invention.
Fig. 3 electrical schematic diagram of the present invention.
Number in the figure is as follows:
11 stratum, 22 conventional pick-up 1 physics resonant cavitys
2 resonance pieces, 3 thimbles, 4 piezoelectric ceramic pieces
5 electric signal amplifiers, 6 leads, 7 circuit box
8 audio signal output ends
Electric elements are as follows:
Field effect transistor: model ZSK30A
Triode: model ZSA733
Amplifier: model NE5532
Resistance: the R1 resistance is that 1M, R2 resistance are that 10K, R3 resistance are 2K
The R4 resistance is that 680 Ω, R5 resistance are that 2.2K, R6 resistance are 27K
The R7 resistance is that 560 Ω, R8 resistance are that 5.6K, R9 resistance are 100K
The R10 resistance is 5.1K.
Electric capacity: C1 is 104, C2, C6 are that 100VF/25V, C3 are 47VF/25V
C4, C5, C7 are 10VF/25V
＜five〉embodiment:
A kind of underground acoustic sensor of the present invention mainly is made up of physics resonant cavity 1, resonance piece 2, top 3, piezoelectric ceramic piece 4, electric signal amplifier 5, lead 6, circuit box 7 and audio signal output end 8 etc.; See also shown in Figure 2, this physics resonant cavity 1 is a cylindrical stainless steel cylinder (Φ 74 * 109 * 0.22 wall thickness mm), end face is resonance piece 2 (Φ 74 * 0.22 wall thickness mm), (Φ 0.7 * 15mm) for its central authorities' welding one thimble 3, (Φ 35 for thimble 3 tips and piezoelectric ceramic piece 4, frequency response 1.8-2.2KHz) contacts, (Φ 0.18 * 37mm) is fixed in the stainless steel cylinder, and the positive and negative electrode of piezoelectric ceramic piece 4 joins with the signal input part and the ground end of two leads 6 (Φ 0.013mm * 7 cores) with electric signal amplifier 5 with four steel wires from four direction with piezoelectric ceramic piece 4.Electric signal amplifier 5 places in the circuit box 7, and audio signal 8 is an output.The principle of electric signal amplifier sees Fig. 3 for details.
Cavity resonant technology and piezo technology are combined, at first sound is strengthened amplifying with physical method, amplify by carrying out secondary after the electromechanics conversion, and spread out of, solved this key technology in signal of telecommunication mode.
See also shown in Figure 3, its circuit working principle:, can obtain the high circuit of supply voltage utilance with series connection N channel field-effect pipe (2SK30A) and triode (2SA733).Resistance R1 (1M) has determined dc point, and to make the collector voltage of V2 (2SA733) be Vcc/2, and the open circuit multiplication factor of V1 (2SK30A) is about 5 times.Because the emitter resistance of V2 (2SA733) is 560 Ω, collector load is 5.6K Ω, so its open circuit multiplication factor is about 10 times, total magnification is 50 times (34dB).Because negative feedback also is 32dB, therefore, it is little to obtain distorted signals, characteristics such as bandwidth.Amplifier NE5532 multiplication factor is about 20 times, so the circuit overall gain is about 58Db.Buried acoustic sensor technical parameter:
Supply voltage: DC12V--15V
Operating current :≤5mA
Frequency response: 100Hz-8KHz
The distortion factor :≤0.1%
Sensitivity (sound intensity value):
Voice (can not hear) :≤5dB/1m
Strike ground (can not hear) :≤1dB/1m
The monitoring scope:
The zone can not heard in ground: a diameter 40m/1 pick-up
But underground monitored area: diameter 80m (conventional soil property)/1 pick-up
Ambient temperature :-25 ℃-+40 ℃
Relative humidity: 100%RH
Waterproof, anticorrosion.
Claims (2)
1, a kind of underground acoustic sensor is characterized in that: it is made up of physics resonant cavity (1), resonance piece (2), thimble (3), piezoelectric ceramic piece (4), electric signal amplifier (5), lead (6), circuit box (7) and audio signal output end (8); This physics resonant cavity (1) is cylindrical stainless steel cylinder, end face at physics resonant cavity (1) is provided with resonance piece (2), central part at resonance piece (2) welds a thimble (3), the tip of this thimble (3) contacts with piezoelectric ceramic piece (4), this piezoelectric ceramic piece (4) is fixed in the physics resonant cavity (1) from four direction by steel wire, this piezoelectric ceramic piece (4) just, negative pole joins by the signal input part and the ground end of two leads (6) with electric signal amplifier (5), this electric signal amplifier (5) places in the circuit box (7), circuit box (7) is arranged on this physics resonant cavity (1) bottom, is provided with audio signal output end (8) on circuit box (7).
2, a kind of underground acoustic sensor according to claim 1 is characterized in that: wherein, the circuit of this electric signal amplifier (5) is made up of field effect transistor 2SK30A, triode 2SA733, amplifier NE5532, resistance R 1～R10, capacitor C 1～C7; Its annexation is: input IN connects an end of capacitor C 1, the other end of capacitor C 1 connects an end of resistance R 1, the G end of field effect transistor 2SK30A, the D end of field effect transistor 2SK30A connects the base stage b end of triode 2SA733, an end that connects resistance R 2, the other end of resistance R 2 connects an end of resistance R 5, the positive pole of capacitor C 2, the minus earth of capacitor C 2, the S end of field effect transistor 2SK30A connects an end of resistance R 3, the positive pole of capacitor C 3, one end of the negative pole of the other end of resistance R 3 and capacitor C 3 and resistance R 6, one end of resistance R 4, one end of resistance R 1 is connected, the other end ground connection of resistance R 4, the emitter e utmost point of triode 2SA733 connects an end of resistance R 7 and the negative pole of capacitor C 4, the other end of resistance R 7 links to each other with the positive pole of capacitor C 4, and connect power supply 12V simultaneously and connect 8 ends of amplifier NE5532, the collector electrode C utmost point of triode 2SA733 is the positive pole that connects capacitor C 5, one end of resistance R 8, the in-phase input end 3 of amplifier NE5532, the negative pole of capacitor C 5 connects the other end of resistance R 6, the other end of resistance R 8 connects ground, be connected in series a resistance R 9 between the inverting input 2 and 1 of amplifier NE5532, its 4 end is connected with ground, one end of resistance R 9 is connected with resistance R 10, the other end of R10 links to each other with the positive pole of capacitor C 6, the negative pole of capacitor C 6 is connected with ground, 1 end of amplifier NE5532 is connected with 5 ends, 6 ends are connected with 7 ends, 7 ends connect the positive pole of capacitor C 7, and the negative pole of C7 is output OUT.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02159452 CN1263345C (en) | 2002-12-31 | 2002-12-31 | Underground sound sensitive sensor |
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| CN 02159452 CN1263345C (en) | 2002-12-31 | 2002-12-31 | Underground sound sensitive sensor |
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| CN1512819A true CN1512819A (en) | 2004-07-14 |
| CN1263345C CN1263345C (en) | 2006-07-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175614A (en) * | 2011-01-28 | 2011-09-07 | 华南理工大学 | Optical fiber coupled optoacoustic integrated detecting probe |
| CN109708744A (en) * | 2019-03-07 | 2019-05-03 | 北京世纪之星应用技术研究中心 | Double oscillator solid acoustic sensor devices |
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| KR100631243B1 (en) | 2002-06-21 | 2006-10-02 | 엘지전자 주식회사 | Recording medium having data structure for managing reproduction of video data recorded thereon |
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| CN101350214B (en) | 2002-06-24 | 2015-07-01 | Lg电子株式会社 | Method and device for recording and reproducing data structure of reproduction for video data |
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| EP1552519A4 (en) | 2002-10-14 | 2006-08-16 | Lg Electronics Inc | Recording medium having data structure for managing reproduction of multiple audio streams recorded thereon and recording and reproducing methods and apparatuses |
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| US7693394B2 (en) | 2003-02-26 | 2010-04-06 | Lg Electronics Inc. | Recording medium having data structure for managing reproduction of data streams recorded thereon and recording and reproducing methods and apparatuses |
| US7809775B2 (en) | 2003-02-27 | 2010-10-05 | Lg Electronics, Inc. | Recording medium having data structure for managing playback control recorded thereon and recording and reproducing methods and apparatuses |
| EP1604356A4 (en) | 2003-02-28 | 2009-12-16 | Lg Electronics Inc | Recording medium having data structure for managing random/shuffle reproduction of video data recorded thereon and recording and reproducing methods and apparatuses |
| US7620301B2 (en) | 2003-04-04 | 2009-11-17 | Lg Electronics Inc. | System and method for resuming playback |
-
2002
- 2002-12-31 CN CN 02159452 patent/CN1263345C/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175614A (en) * | 2011-01-28 | 2011-09-07 | 华南理工大学 | Optical fiber coupled optoacoustic integrated detecting probe |
| CN109708744A (en) * | 2019-03-07 | 2019-05-03 | 北京世纪之星应用技术研究中心 | Double oscillator solid acoustic sensor devices |
| CN109708744B (en) * | 2019-03-07 | 2024-05-24 | 北京世纪之星应用技术研究中心 | Double-vibrator solid sound sensor device |
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| CN1263345C (en) | 2006-07-05 |
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