CN202140798U - Leakage listening detector adopting programmable filter - Google Patents
Leakage listening detector adopting programmable filter Download PDFInfo
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- CN202140798U CN202140798U CN201120146120U CN201120146120U CN202140798U CN 202140798 U CN202140798 U CN 202140798U CN 201120146120 U CN201120146120 U CN 201120146120U CN 201120146120 U CN201120146120 U CN 201120146120U CN 202140798 U CN202140798 U CN 202140798U
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Abstract
The utility model discloses a leakage listening detector adopting a programmable filter, which is composed of a sensor, a host machine and earphones. The host machine mainly comprises an amplifier, a filter and a power amplifier which are sequentially connected in series, the sensor is connected with the amplifier, and the earphones are connected with the power amplifier. The filter is composed of two switching capacity filters and a programmable timer chip, one switching capacity filter is designed to be high pass, and the other switching capacity filter is designed to be low pass, the two switching capacity filters are in cascade connection and then form a band-pass filter, and the numerical frequency output end of the programmable timer chip is connected with the two switching capacity filters. The leakage listening detector adopting the programmable filter can solve a technical problem that a traditional leakage listening detector is poor in reliability due to the fact that needed frequency cannot be accurately set.
Description
Technical field
The utility model belongs to liquid pressure conduit Leak testtion and leakage positioning device, is specifically related to the audio-frequency noise filter amplifying processing technology of liquid pressure conduit.
Background technique
Under the day by day deficient situation of water resources, improve the task of top priority that the water supply utilization ratio is water saving.On waterline, because the factors such as quality, construction factor, geological condition and service time of pipeline, leakage problem happens occasionally.Generally,, when having only a large amount of leakages to occur, just come to light, and before coming to light, wasted great amount of water resources because discovery is untimely.In order to reduce the leak rate of water supply, develop that a kind of price is low, easy to operate, reliable performance and strong Leak testtion and the leakage positioning device of function be the most effective leakproof water saving way.
Using leakage measuring instrument by sonic to survey the leakage point position is a kind of method commonly used, and leakage measuring instrument by sonic has pickup head usually, and main frame and earphone three parts are formed.Probe places on ground or the pipeline, and sensor is equipped with in inside, can detect the vibration of transmitting on ground or the pipeline.The signal filtering that main frame is sent sensor here is amplified, and outputs to earphone, and the inspector seeks through the sound of earphone and judges the leakage point position.
Because the detected audio signal of leakage measuring instrument by sonic belongs to noise signal, the frequency band broad also adds assorted ambient noises such as automobile, machine on every side, Interference Detection personnel's judgement.So leakage measuring instrument by sonic is very important to the Shelving of audio signal, can follow according to tubing, ambient conditions and choose suitable frequency band, thereby avoid noise interference to greatest extent, improve the leak detection effect.
Audio frequency filtering technique commonly used has two kinds, and a kind of is the purpose that reaches required passband through the cutoff frequency that potentiometer is regulated low pass or high-pass filter.This mode adopts potentiometer, and volume can not be too small, and necessary manual tune mismatches with present popular TFT LCD operation style, and can not accurately be transferred to required frequency.If adopt digital regulation resistance to replace traditional potentiometer, the one, cost improves a lot, and the 2nd, equally accurate control frequency.
Another kind is to adopt fixing multichannel band-pass filter parallel way, inserts different band-pass through switch and reaches the requirement to different passbands.This mode, owing to adopted too much electronic component, complicated circuit, poor reliability, cost is high.Regulating frequency continuously, because the discreteness of circuit itself, frequency accuracy can not be done very certainly equally.
Summary of the invention
The purpose of the utility model provides a kind of leakage measuring instrument by sonic that adopts programmable filter, with solve that traditional leakage measuring instrument by sonic exists because of can not accurately being transferred to required technical problems such as frequency poor reliability.
The leakage measuring instrument by sonic of the described employing programmable filter of the utility model realizes that the technological scheme of foregoing invention purpose is following: be made up of sensor, main frame and earphone three parts; Main frame wherein mainly comprises amplifier, wave filter and the power amplifier of series connection successively, and said sensor is connected with amplifier, and earphone is connected with power amplifier; Form wave filter by two SCFs and a programmable timer chip; One of them SCF is designed to high pass; Another SCF is designed to low pass; Constitute a band-pass filter after both cascades, the numerical frequency output terminal of said programmable timer chip is connected with two SCFs.
The utility model adopts SCF chip and digital clock chip portfolio, and is simple in structure, and reliability is high.Owing to outside square signal control is adopted in filter frequencies control, square signal can accurately be controlled by the generation of programmable timer chip, thereby has guaranteed the accuracy of filter frequencies.Because the frequency of square signal can change continuously, so filter cutoff frequency can change continuously.
Description of drawings
Fig. 1 is the schematic block circuit diagram of the utility model.
Fig. 2 is the wave filter theory diagram of the utility model.
Fig. 3 is the specific embodiment circuit diagram of high pass switch capacitor filters in the wave filter of the utility model.
Fig. 4 is the specific embodiment circuit diagram of low pass SCF in the wave filter of the utility model.
Fig. 5 is the frequency control circuit figure of the utility model.
Embodiment
The embodiment of the utility model is referring to accompanying drawing.
Fig. 1 is that the circuit of this leakage measuring instrument by sonic is formed skeleton diagram, is made up of sensor, main frame, earphone three parts.Main frame mainly is made up of amplifier, wave filter, power amplifier, single-chip microcomputer, keyboard, liquid crystal display, power supply.
Fig. 2 is a wave filter functional-block diagram of the present invention, and two wave filter are accomplished by SCF respectively, and FREQUENCY CONTROL can reach the upper frequency control accuracy by the output of programmable timer chip, but frequency continually varying effect.One of them wave filter is designed to high pass, and another is designed to low pass, reaches the effect of a band-pass filter after both cascades.Timer chip is adopted in numerical frequency control, by Single-chip Controlling, and exportable different frequency square wave, thus reach the purpose of controlling two filter bandwidhts.
Fig. 3 to Fig. 5 has provided the practical implementation circuit of high and low logical SCF and frequency control circuit in the wave filter.High and low logical SCF adopts the LTC1068 chip, and single-chip microcomputer adopts the 82C54 chip.
Claims (1)
1. a leakage measuring instrument by sonic that adopts programmable filter is characterized in that, is made up of sensor, main frame and earphone three parts; Main frame wherein mainly comprises amplifier, wave filter and the power amplifier of series connection successively, and said sensor is connected with amplifier, and earphone is connected with power amplifier; Form wave filter by two SCFs and a programmable timer chip; One of them SCF is designed to high pass; Another SCF is designed to low pass; Constitute a band-pass filter after both cascades, the numerical frequency output terminal of said programmable timer chip is connected with two SCFs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120146120U CN202140798U (en) | 2011-05-10 | 2011-05-10 | Leakage listening detector adopting programmable filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120146120U CN202140798U (en) | 2011-05-10 | 2011-05-10 | Leakage listening detector adopting programmable filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202140798U true CN202140798U (en) | 2012-02-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120146120U Expired - Fee Related CN202140798U (en) | 2011-05-10 | 2011-05-10 | Leakage listening detector adopting programmable filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202140798U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090194A (en) * | 2013-01-12 | 2013-05-08 | 苏州市伦琴工业设计有限公司 | Underground pipeline water leakage detection method |
| CN106052963A (en) * | 2016-05-20 | 2016-10-26 | 黄泽浩 | Device used for clinical test of VSD air leakage |
-
2011
- 2011-05-10 CN CN201120146120U patent/CN202140798U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090194A (en) * | 2013-01-12 | 2013-05-08 | 苏州市伦琴工业设计有限公司 | Underground pipeline water leakage detection method |
| CN103090194B (en) * | 2013-01-12 | 2015-07-01 | 中核华泰建设有限公司 | Underground pipeline water leakage detection method |
| CN106052963A (en) * | 2016-05-20 | 2016-10-26 | 黄泽浩 | Device used for clinical test of VSD air leakage |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120208 Termination date: 20190510 |