CN104596637A - Calabash-shaped resonant cavity sensor collecting infrasonic waves by aid of pressure, and demonstration device - Google Patents
Calabash-shaped resonant cavity sensor collecting infrasonic waves by aid of pressure, and demonstration device Download PDFInfo
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- CN104596637A CN104596637A CN201510038979.6A CN201510038979A CN104596637A CN 104596637 A CN104596637 A CN 104596637A CN 201510038979 A CN201510038979 A CN 201510038979A CN 104596637 A CN104596637 A CN 104596637A
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Abstract
The invention discloses a calabash-shaped resonant cavity sensor collecting infrasonic waves by aid of pressure, and a demonstration device. The calabash-shaped resonant cavity sensor includes a calabash-shaped resonant cavity and an air pressure sensor. The infrasonic wave demonstration device includes an infrasonic wave generator, a calabash-shaped resonant cavity sensor and a signal collection processor, wherein the calabash-shaped resonant cavity sensor is connected with the signal collection processor. The calabash-shaped resonant cavity sensor collecting infrasonic waves by aid of pressure, and the demonstration device are ingenious in structural design, the calabash-shaped resonant cavity sensor measures variable voltage in a sealed calabash-shaped space according to the pressure, even tiny change of infrasonic wave signals in the calabash-shaped resonant cavity can cause great change of pressure in the cavity, then after such amplification, tiny vibration can cause change of pressure in a cavity of the air pressure sensor, and accordingly infrasonic wave signals can be detected. The demonstration device adopts multiple technologies such as the sensors and digital signal processing, and can conduct continuous data collection, storage and real-time waveform display.
Description
Technical field
The present invention relates to infrasonic detection technical field, be specifically related to one and utilize pressure to gather infrasonic Pear-Shaped resonant cavity sensor and apparatus for demonstrating.
Background technology
Infrasonic wave frequency is between 0 ~ 20Hz, and because frequency is very low, infrasonic wave is the unheard low frequency wave of a kind of people's ear.The disturbance of air can be caused when infrasonic wave is propagated in an atmosphere, thus cause the micro-displacement of the pressure of air, density and air particle.Changing as captured these small air when detecting infrasonic wave, just can obtain infrasonic many parameters.
Can realize infrasonic wave existing sensor of sampling and have many kinds, as shown in table 1, the test philosophy of employing and method also have a variety of.
Table 1
| kind of sensor | feature |
| piezoelectric ceramic type | the DC response exported is poor, insensitive for infrasonic reception reaction.The electric charge that External Force Acting produces on the piezoelectric element only could be preserved in leak free situation, poor anti-interference, the vibration of desk, wind blow the larger change that all can cause electric potential difference. |
| moving-coil microphone | by constantly moving according to sound pressure variations in magnetic field with the lead loop that vibrating diaphragm is closely connected.Have good anti-interference, but lifting surface area is too little, signal is very weak, causes sensitivity too low. |
| condenser type | tested mechanical quantity, as displacement, pressure etc. are converted to electric capacitance change, capacitance change sensitivity is low. |
Above method has respective limitation, present invention employs a kind of brand-new method of testing, namely based on the method for testing of gas pressure intensity change.Infrasonic wave receiving sensor responds to infrasonic wave signal by measuring small variations in flow in air, because infrasonic acoustic pressure is very little, only has the order of magnitude of tens to hundreds of Pa, the variations in flow that this acoustic pressure causes is more small, the mechanical diaphragm deformation caused also is very small, therefore, want that it is very difficult for directly detecting infrasonic sound waveform signal with the mechanical shift that a very little mechanical cross section causes in infrasonic wave.
Summary of the invention
The object of the invention is to the deficiency overcoming the existence of above-mentioned prior art, there is provided and utilize pressure to gather infrasonic Pear-Shaped resonant cavity sensor and apparatus for demonstrating, the test philosophy of this sensor causes gas pressure intensity change in sensor cavity by measurement infrasonic wave and detects infrasonic wave intensity.
Utilize pressure to gather infrasonic Pear-Shaped resonant cavity sensor, it comprises Pear-Shaped resonant cavity and air pressure sensor; Pear-Shaped resonant cavity comprises the first cavity 101 of being interconnected and the second cavity 102, first cavity volume is less than and the second cavity volume; The one end open of the first cavity, for receiving infrasonic wave signal, the other end is communicated with the second cavity and forms Pear-Shaped structure; Bottom and the Pear-Shaped resonant cavity of the second cavity are connected with the gas input of air pressure sensor.
Further optimization, described air pressure sensor adopts microbarometer, and described microbarometer outer boundary air pressure variations causes microbarometer cavity external and internal pressure uneven and causes diaphragm deformation, is exported change voltage signal accordingly by diaphragm deformation.
Further optimization, the encapsulant of described Pear-Shaped resonant cavity adopts transparent membrane.
Further optimization, described transparent membrane adopts preservative film.
Further optimization, the volume of described Pear-Shaped resonant cavity is greater than the volume of air pressure sensor internal cavity.
Further optimization, the one end open area of described first cavity is greater than the gas input area of air pressure sensor.
Present invention also offers the infrasonic wave apparatus for demonstrating utilizing pressure to gather infrasonic Pear-Shaped resonant cavity sensor, it is characterized in that comprising infrasonic wave generator, described Pear-Shaped resonant cavity sensor, signal acquisition process device, the output of Pear-Shaped resonant cavity sensor is connected with the input of signal acquisition process device, and signal acquisition process device is used for gathering, processing and display infrasonic wave signal.
Further optimization, described signal acquisition process device comprises signal amplification circuit, low passband wave circuit, frequency triggers waveform shaping circuit, A/D change-over circuit, 32 RAM control chip circuit, voltage/dB converters and display circuit, signal amplification circuit is connected with low passband wave circuit, low passband wave circuit triggers waveform shaping circuit with frequency respectively, A/D change-over circuit, voltage/dB converters connects, voltage/dB converters is also connected with A/D change-over circuit, frequency triggers waveform shaping circuit, the output of A/D change-over circuit is all by being connected with display circuit after 32 RAM control chip processing of circuit, the data processing work of 32 RAM control chip circuit comprises waveform display, waveform frequency calculates and display, waveform characteristics calculates and display, display circuit is to infrasonic waveform, frequency and DB value show.
Further optimization, described display circuit adopts liquid crystal display.Described infrasonic wave generator comprises the low frequency generator, low-frequency signal amplifier, the low-frequency sound wave broadcast device that connect in turn.
Compared with prior art, tool of the present invention has the following advantages and technique effect:
Infrasonic detection is a newer field, infrasonic wave signal is very small, the vibrations in the external world caused due to infrasonic wave are very faint, and also very little for the air change in air pressure sensor chamber, thus the present invention has made a Pear-Shaped resonant cavity dexterously.Pear-Shaped resonant cavity sensor by recording the voltage of a change in the Pear-Shaped space of a sealing according to the size of pressure, this cavity all can cause the change that in larger cavity, pressure is larger for the subtle change of infrasonic wave signal, through the amplification of this one-level, slight vibrations will cause the pressure change in air pressure sensor chamber, thus infrasonic wave signal detected.Apparatus for demonstrating produces collection, process and display from infrasonic wave, applies the multiple technologies such as sensor, digital signal processing, can carry out continuous print data acquisition, storage, real-time waveform display.Described Pear-Shaped resonant cavity sensor and signal acquisition process device as portable infrasonic wave detector, can have the advantage that cost performance is high, antijamming capability is stronger.
Accompanying drawing explanation
Fig. 1 is the structural representation utilizing pressure to gather infrasonic Pear-Shaped resonant cavity sensor in example.
Fig. 2 is the infrasonic wave apparatus for demonstrating schematic diagram in example.
Fig. 3 is circuit formation and the signal flow schematic diagram that in example, infrasonic wave drills device.
Fig. 4 a and Fig. 4 b is the working routine schematic flow sheet of a kind of example in embodiment.
Embodiment
Below in conjunction with accompanying drawing and example, specific embodiment of the invention is described further; but enforcement of the present invention and protection are not limited thereto; separately, if having process or the circuit structure of special detailed description below, be all that those skilled in the art can refer to existing techniques in realizing.
As Fig. 1, utilize pressure to gather infrasonic Pear-Shaped resonant cavity sensor, comprise Pear-Shaped resonant cavity and air pressure sensor; Pear-Shaped resonant cavity comprises the first cavity 101 of being interconnected and the second cavity 102, first cavity volume is less than and the second cavity volume; The one end open of the first cavity, for receiving infrasonic wave signal, the other end is communicated with the second cavity and forms Pear-Shaped structure; Bottom and the Pear-Shaped resonant cavity of the second cavity are connected with the gas input of air pressure sensor.The volume of described Pear-Shaped resonant cavity is greater than the volume of the cavity of air pressure sensor.The one end open area of the first cavity is greater than the gas input area of air pressure sensor.
As an example, described air pressure sensor adopts microbarometer, and described microbarometer outer boundary air pressure variations causes microbarometer cavity external and internal pressure uneven and causes diaphragm deformation, is exported change voltage signal accordingly by diaphragm deformation.
Through experiment, the encapsulant of Pear-Shaped resonant cavity sensor is extremely important for the detection sensitivity of sensor, and the material be applicable to is few, and table 2 is contrasts of some materials.
Table 2
| material | feature |
| leathercraft | the low leakproofness of sensitivity is bad, and installation difficulty is large. |
| general plastics | the low leakproofness of sensitivity is bad, and pliability is poor |
| preservative film | the preservative film transparency is good, be not easy to break, and has good stickiness, good leak tightness, high sensitivity simultaneously. |
Through repeatedly testing, employing preservative film is the encapsulant of " Pear-Shaped resonant cavity sensor ", and experiment proves that this material is a kind of good colorimetric sensor films material.This cavity all can cause the change that in larger cavity, pressure is larger for the subtle change of infrasonic wave signal, through amplification and the resonance of this one-level, little by little slight vibrations will cause the pressure change in air pressure sensor chamber, thus infrasonic wave signal detected.
As Fig. 2, the infrasonic wave apparatus for demonstrating of this example comprises infrasonic wave simulation generator and infrasonic wave generator, Pear-Shaped resonant cavity sensor shown in infrasonic sensor and Fig. 1, and signal acquisition process device, the output of Pear-Shaped resonant cavity sensor is connected with the input of signal acquisition process device.Consider that infrasonic wave needs display waveform, calculating and display frequency and DB value, final choice 32 ARM are the process chip of signal acquisition process device.Infrasonic wave generator can adopt the low frequency generator, low-frequency signal amplifier, low-frequency sound wave broadcast device (large bass horn) formation that connect in turn.
As an example, described signal acquisition process device comprises signal amplification circuit, low-pass filter circuit, frequency triggers waveform shaping circuit, A/D change-over circuit, 32 RAM control chip circuit, voltage/dB converters and display circuit, signal amplification circuit is connected with low passband wave circuit, low passband wave circuit triggers waveform shaping circuit with frequency respectively, A/D change-over circuit, voltage/dB converters (can adopt MX636 voltage and DB value change-over circuit) is connected, voltage/dB converters is also connected with A/D change-over circuit, frequency triggers waveform shaping circuit, the output of A/D change-over circuit is all by being connected with display circuit after 32 RAM control chip processing of circuit, the data processing work of 32 RAM control chip circuit comprises waveform display, waveform frequency calculates and display, waveform characteristics calculates and display, display circuit is to infrasonic waveform, frequency and DB value show.Concrete signal transmission and treatment scheme are as shown in Figure 3.Voltage/dB converters operating voltage is positive and negative 5 volts, and input signal, from 0 ~ ~ 200mv, converts the effective value of 0 ~ ~ 80db to.
Display circuit described in this example adopts liquid crystal display, air pressure sensor can adopt MP3V5004DP air pressure sensor, signal is inputted by MP3V5004DP air pressure sensor, is a VPP(peak-to-peak value) be approximately the sinusoidal quantity voltage of 15mV.Utilize the characteristic of signal amplification circuit and LM324 operational amplifier chip, adopt homophase input to amplify, this circuit is divided into into three parts.First part is that signal the two poles of the earth are amplified 200 times (3V) altogether.Then a 30Hz active low-pass filter has been used.Thus by the target signal filter of high frequency, the low frequency signal remained with, last portion will by sinusoidal waveform by a voltage comparator out square wave.
As shown in figures 4 a and 4b, it is the software workflow schematic diagram of a kind of example in embodiment, those skilled in the art can refer to this process flow diagram and carry out programming realization, and master routine is carrying out the collection of infrasonic wave signal decibel value, infrasonic wave waveform acquisition, software filtering shaping always, dB value calculates and waveform shows.Master routine interrupt service subroutine is started, process infrasonic wave signal data when infrasonic wave signal being detected.
Claims (10)
1. utilize pressure to gather infrasonic Pear-Shaped resonant cavity sensor, it is characterized in that comprising Pear-Shaped resonant cavity and air pressure sensor; Pear-Shaped resonant cavity comprises the first cavity and the second cavity that are interconnected, and the first cavity volume is less than and the second cavity volume; The one end open of the first cavity, for receiving infrasonic wave signal, the other end is communicated with the second cavity and forms Pear-Shaped structure; Bottom and the Pear-Shaped resonant cavity of the second cavity are connected with the gas input of air pressure sensor.
2. the pressure that utilizes according to claim 1 gathers infrasonic Pear-Shaped resonant cavity sensor, it is characterized in that described air pressure sensor adopts microbarometer, described microbarometer outer boundary air pressure variations causes microbarometer cavity external and internal pressure uneven and causes diaphragm deformation, is exported change voltage signal accordingly by diaphragm deformation.
3. the pressure that utilizes according to claim 1 gathers infrasonic Pear-Shaped resonant cavity sensor, it is characterized in that the encapsulant of described Pear-Shaped resonant cavity adopts transparent membrane.
4. the pressure that utilizes according to claim 1 gathers infrasonic Pear-Shaped resonant cavity sensor, it is characterized in that described transparent membrane adopts preservative film.
5. the pressure that utilizes according to claim 1 gathers infrasonic Pear-Shaped resonant cavity sensor, it is characterized in that the volume of described Pear-Shaped resonant cavity is greater than the volume of air pressure sensor internal cavity.
6. the pressure that utilizes according to claim 1 gathers infrasonic Pear-Shaped resonant cavity sensor, it is characterized in that the one end open area of described first cavity is greater than the gas input area of air pressure sensor.
7. utilize the infrasonic wave apparatus for demonstrating utilizing pressure to gather infrasonic Pear-Shaped resonant cavity sensor according to claim 1, it is characterized in that comprising infrasonic wave generator, described Pear-Shaped resonant cavity sensor, signal acquisition process device, the output of Pear-Shaped resonant cavity sensor is connected with the input of signal acquisition process device, and signal acquisition process device is used for gathering, processing and display infrasonic wave signal.
8. infrasonic wave apparatus for demonstrating according to claim 7, it is characterized in that described signal acquisition process device comprises signal amplification circuit, low passband wave circuit, frequency triggers waveform shaping circuit, A/D change-over circuit, 32 RAM control chip circuit, voltage/dB converters and display circuit, signal amplification circuit is connected with low passband wave circuit, low passband wave circuit triggers waveform shaping circuit with frequency respectively, A/D change-over circuit, voltage/dB converters connects, voltage/dB converters is also connected with A/D change-over circuit, frequency triggers waveform shaping circuit, the output of A/D change-over circuit is all by being connected with display circuit after 32 RAM control chip processing of circuit, the data processing work of 32 RAM control chip circuit comprises waveform display, waveform frequency calculates and display, waveform characteristics calculates and display, display circuit is to infrasonic waveform, frequency and DB value show.
9. infrasonic wave apparatus for demonstrating according to claim 8, is characterized in that described display circuit adopts liquid crystal display.
10., according to infrasonic wave apparatus for demonstrating according to claim 7, it is characterized in that described infrasonic wave generator comprises low frequency generator, low-frequency signal amplifier, the low-frequency sound wave broadcast device connected in turn.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106323455A (en) * | 2016-08-18 | 2017-01-11 | 中国地震局地壳应力研究所 | Difference type infrasonic wave monitor based on MEMS microbarometer |
| CN108663114A (en) * | 2018-06-22 | 2018-10-16 | 庄明磊 | A kind of equipment carrying out Precision measurement using resonance principle amplification mechanical oscillation |
| CN112284763A (en) * | 2020-10-23 | 2021-01-29 | 恒大新能源汽车投资控股集团有限公司 | Vehicle sealing performance detection device and system |
| CN115615535A (en) * | 2022-09-30 | 2023-01-17 | 湘潭市神钜机电科技有限公司 | Low-frequency acoustic wave sensor |
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| CN2324786Y (en) * | 1996-03-28 | 1999-06-23 | 陈坚胜 | Piezoelectricity ceramics ultrasonic transducer with two resonant cavities |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106323455A (en) * | 2016-08-18 | 2017-01-11 | 中国地震局地壳应力研究所 | Difference type infrasonic wave monitor based on MEMS microbarometer |
| CN106323455B (en) * | 2016-08-18 | 2018-12-04 | 中国地震局地壳应力研究所 | Differential type monitored by infrasonic wave instrument based on MEMS micromanometer |
| CN108663114A (en) * | 2018-06-22 | 2018-10-16 | 庄明磊 | A kind of equipment carrying out Precision measurement using resonance principle amplification mechanical oscillation |
| CN112284763A (en) * | 2020-10-23 | 2021-01-29 | 恒大新能源汽车投资控股集团有限公司 | Vehicle sealing performance detection device and system |
| CN115615535A (en) * | 2022-09-30 | 2023-01-17 | 湘潭市神钜机电科技有限公司 | Low-frequency acoustic wave sensor |
| CN115615535B (en) * | 2022-09-30 | 2024-04-30 | 湘潭市神钜机电科技有限公司 | Low-frequency acoustic wave sensor |
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Application publication date: 20150506 |