CN201876305U - Device for extracting sound wave signal by pressure sensor - Google Patents
Device for extracting sound wave signal by pressure sensor Download PDFInfo
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- CN201876305U CN201876305U CN2010202886086U CN201020288608U CN201876305U CN 201876305 U CN201876305 U CN 201876305U CN 2010202886086 U CN2010202886086 U CN 2010202886086U CN 201020288608 U CN201020288608 U CN 201020288608U CN 201876305 U CN201876305 U CN 201876305U
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- wave signal
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Abstract
The utility model provides a device for extracting a sound wave signal by a pressure sensor. The utility model is characterized in that the device comprises the pressure sensor and a sound wave signal extracting and processing module, wherein the pressure sensor is contacted with a sound wave generating source to sense a compression and sparsity alternately-changed sound pressure formed when the sound wave is propagated in the air so as to obtain a pressure signal with higher precision; and the sound wave signal extracting and processing module is used for extracting the tiny pressure fluctuation caused by the sound wave in a pressure signal output by the pressure sensor, the sound wave signal extracting and processing module comprises a filter and an amplifier, the filter is used for filtering off a direct-current signal, a lower-frequency sound wave signal and a high-frequency sound wave signal, wherein the direct-current signal is used for reflecting a pressure value, the lower-frequency sound wave signal and the high-frequency sound wave signal are out of the frequency band range of a target sound wave signal, and the filtered signal is input into the amplifier, so that the signal to noise ratio (SNR) of the sound wave signal is improved.
Description
Technical field
The utility model relates to acoustic signals detection technology field, relates in particular to a kind of device that utilizes pressure transducer to extract acoustic signals.
Background technology
Sound wave is a matter wave, is one or more variations of physical quantitys such as the pressure propagated in elastic medium (gas, liquid and solid), stress, particle movement.Sound can cause that in communication process acoustic pressure is the variation of the pressure that causes of the existence owing to sound wave, and unit is Pa.When propagating, sound wave forms compression and sparse alternate in air, so pressure changes also positive and negative replacing.
For this reason, the utility model proposes a kind of device that utilizes pressure transducer (being also referred to as pressure unit sometimes) to extract acoustic signals, this device with the pressure signal of pressure transducer output through acoustic signals extract handle after, can obtain acoustic signals, this device is particularly suitable for the sensing of pipe leakage sound wave.
The utility model content
A kind of device that utilizes pressure transducer to extract acoustic signals that the utility model proposes, it is characterized in that comprising: pressure transducer, it contacts with sound source, is used for the sensing sound wave forms compression and sparse alternate when air is propagated acoustic pressure, obtains the higher pressure signal of precision; Acoustic signals extracts processing module, from the pressure signal of pressure transducer output, extract the slight pressure fluctuation that sound wave causes, it comprises wave filter and two parts of amplifier, wave filter is used to remove the direct current signal of reflection force value and low-frequency sound wave signal and the high frequency sound wave signal outside the target acoustic signals frequency band range, and the signal after the filtering will be input to amplifier to improve the acoustic signals signal to noise ratio (S/N ratio).
Description of drawings
Below in conjunction with drawings and embodiments the utility model is described in further detail.
Fig. 1 utilizes pressure transducer to extract the system works block diagram of acoustic signals;
Before Fig. 2 filtering, the signal of pressure transducer output;
After Fig. 3 filtering, the acoustic signals of acquisition is buried in the noise substantially;
Fig. 4 amplifies the leakage sound wave after strengthening, and signal to noise ratio (S/N ratio) is significantly improved.
Embodiment
As shown in Figure 1, the utility model proposes the device that utilizes pressure transducer (being also referred to as pressure unit sometimes) to extract acoustic signals and comprised pressure transducer, it contacts with sound source, be used for the sensing sound wave forms compression and sparse alternate when air is propagated acoustic pressure, obtain the higher pressure signal of precision.Usually, carried acoustic signals in the pressure signal, but because pressure signal is a bigger force value, and the pressure surge that sound wave causes is a very little force value.For example, its value of a standard atmospheric pressure (air pressure that refers to sea level under standard atmosphere condition) is 101325 Pascals in air, is about 10
5Pascal, and the air pressure variations that the minimum sound that people's ear can be heard causes is about 2*10
-5Pascal.
Therefore,, need to introduce acoustic signals and extract processing module, from the pressure signal of pressure transducer output, extract the slight pressure fluctuation that sound wave causes in order to obtain high-quality acoustic signals.
Acoustic signals extracts processing module and comprises wave filter and two parts of amplifier.
Usually pressure signal is that a variation is slower, numerical value bigger on the occasion of.And acoustic signals is because particle vibration causes that its change value of pressure is more small, and can just can bear.The main effect of filtering is to remove the direct current signal of reflection force value and low-frequency sound wave signal and the high frequency sound wave signal outside the target acoustic signals frequency band range.
Fig. 2 and 3 has represented the pressure sensor signal signal waveform behind the wavefront after filtration respectively.
Acoustic signals intensity after the filtering a little less than, be submerged in easily in the system background noise.In order further to improve the acoustic signals signal to noise ratio (S/N ratio), the signal after the filtering will be input to amplifier.After the amplifier output, obtain the sound wave signal that signal to noise ratio (S/N ratio) obviously promotes.
Fig. 4 has represented that through the sound wave signal after amplifying, visible sound wave signal is enhanced effectively.
The pressure transducer that the device that the utility model proposes utilizes industry spot to be used widely after filtering and amplifying, obtains the higher voice signal of signal to noise ratio (S/N ratio), has higher economical efficiency and security.Because traffic filter and amplifier all are existing mature technology, just have been not described in detail here.
The utility model is obtained the advantage of following several respects at least:
1) the acoustic signals extraction module that the utility model proposes is handled by wave filter and amplifier, can change from the slight pressure of standard pressure transducer abstraction reaction sound variation, finally obtains the higher voice signal of signal to noise ratio (S/N ratio);
2) for hazardous areas such as boiler and pressure vessels, the widely used standard pressure transducer of industry spot meets relevant anti-explosion safety standard, protection safety standard and other relevant criterion, helps the security and the stability of safeguards system;
3) can utilize the widely used standard pressure transducer of industry spot to gather the sound wave signal, adopt the standard mounting interface, the convenient installation and construction, and can reduce the expense of sonic sensor greatly.
More than, describe embodiment of the present utility model in detail, according to the mode that content those skilled in the art of the present utility model can rationally deduce, all should be within protection domain of the present utility model.
Claims (1)
1. device that utilizes pressure transducer to extract acoustic signals is characterized in that comprising: pressure transducer, and it contacts with sound source, is used for the sensing sound wave and forms when air is propagated and compress and the acoustic pressure of sparse alternate, obtains pressure signal; Acoustic signals extracts processing module, from the pressure signal of pressure transducer output, extract the slight pressure fluctuation that sound wave causes, it comprises wave filter and two parts of amplifier, wave filter is used to remove the direct current signal of reflection force value and low-frequency sound wave signal and the high frequency sound wave signal outside the target acoustic signals frequency band range, and the signal after the filtering will be input to amplifier to improve the acoustic signals signal to noise ratio (S/N ratio).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202886086U CN201876305U (en) | 2010-08-12 | 2010-08-12 | Device for extracting sound wave signal by pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202886086U CN201876305U (en) | 2010-08-12 | 2010-08-12 | Device for extracting sound wave signal by pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201876305U true CN201876305U (en) | 2011-06-22 |
Family
ID=44164221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202886086U Expired - Lifetime CN201876305U (en) | 2010-08-12 | 2010-08-12 | Device for extracting sound wave signal by pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201876305U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101915608A (en) * | 2010-08-12 | 2010-12-15 | 北京寰宇声望智能科技有限公司 | Device and method for extracting acoustic signals by pressure sensor |
| 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 |
| CN109600987A (en) * | 2016-07-20 | 2019-04-09 | 心脏起搏器股份公司 | System and its associated method including the pressure sensor for detecting pressure and body sounds |
-
2010
- 2010-08-12 CN CN2010202886086U patent/CN201876305U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101915608A (en) * | 2010-08-12 | 2010-12-15 | 北京寰宇声望智能科技有限公司 | Device and method for extracting acoustic signals by pressure sensor |
| CN109600987A (en) * | 2016-07-20 | 2019-04-09 | 心脏起搏器股份公司 | System and its associated method including the pressure sensor for detecting pressure and body sounds |
| CN109600987B (en) * | 2016-07-20 | 2021-10-22 | 心脏起搏器股份公司 | System including pressure sensors for detecting pressure and body sounds and associated methods |
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110622 |
|
| CX01 | Expiry of patent term |