CN1034267A - Narrow frequency band supersonic leak detector - Google Patents
Narrow frequency band supersonic leak detector Download PDFInfo
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- CN1034267A CN1034267A CN 87101132 CN87101132A CN1034267A CN 1034267 A CN1034267 A CN 1034267A CN 87101132 CN87101132 CN 87101132 CN 87101132 A CN87101132 A CN 87101132A CN 1034267 A CN1034267 A CN 1034267A
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- China
- Prior art keywords
- frequency
- leak detector
- supersonic
- leak
- ultrasonic
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- Examining Or Testing Airtightness (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
A kind of narrow frequency band supersonic leak detector.Be applicable to leak check, power cable corona discharge, the fault diagnosis when mechanical movement is worked of the Leak Detection metal vacuum container of various sealing systems and communication pressurizing cable.This instrument is made of ultrasonic leakage signal generator and supersonic leak detector two parts.Because having adopted narrow-band detection technique, its band width is 40KHz ± 2%.(hundred He Zhi magnitude bandwidth), detect wide, strong interference immunity, the sensitivity that continues and resolution height are having noise circumstance successfully to detect and locate in disturbing.And volume is little, and one-handed performance just can carry out whole testings.
Description
Narrow frequency band supersonic leak detector belongs to the ultrasonic detecting technology field, and Leak Detection, the high-voltage corona discharge that is applicable to the various Leak Detection that pressure or stress-free sealing system arranged, vacuum tank detects and the departments such as fault diagnosis of machine work state.
Existing ultrasonic leak detection method is can produce the broadband ultrasonic signals of outside emission according to pressure vessel in leak, adopts the ultrasonic reception detector of broadband to detect this leakage signal thus.Representative product is Sweden SPM company " LDE-10 " supersonic leak detector.Frequency span is 15KHz, and detecting the sound wave limit is 1 millimicro crust.Detect leakage with broadband (ten kilo hertzs of sesame levels of index bandwidth) leak locator, can determine leakage point though can receive the most signal ， And that produces when leaking.But, because the bandwidth of its reception detects when leaking in the bigger environment of noise and will be interfered, even can't detect.Therefore, detect when leaking with the supersonic leak detector of broadband reception pattern, higher to environment requirement, this has also just limited the range of application that detects.In order to obtain good detection effect, also necessary special broadband reception sensor and the low-noise device of adapted costs an arm and a leg, and is difficult for promoting the use of.
The object of the present invention is to provide a kind of testing environment requirement low, strong anti-interference performance has the supersonic leak detector of high sensitivity and resolution.
The present invention is made of ultrasonic leakage signal generator and supersonic leak detector two parts.Supersonic leak detector is to be used for receiving leaking signal, finds to leak and leak is accurately located; Ultrasonic leakage signal generator can produce the simulated leakage signal, and the seal leakage that is used for vessels not under pressure detects.
Principle of work of the present invention as shown in Figure 1.Ultrasonic leakage signal generator is by signal generator 1, signal generator 2 intermittently, and power amplifier 3 and ultrasonic generator 4 are formed.Wherein signal generator 1 produces the electric signal of 40KHz frequency; Intermittently signal generator 2 produces the modulating signal of 1～3 He Zhi, can carry out the modulation at intermittence to the 40KHz signal, and K controls by gauge tap; Power amplifier 3 is with electric signal Jin capable Fang Da And and the transmitting probe coupling of 40KHz; Ultrasonic generator 4 converts the 40KHz electric signal to ultrasonic signals outwards to be launched, thereby constitutes ultrasonic leakage signal generator.Supersonic leak detector is by receiving sensor 5, high frequency prime amplifier 6, arrowband radio-frequency amplifier 7, frequency mixer 8, local oscillation circuit 9, note amplifier 10 and leak volume indicator 11 and form.Wherein receiving sensor 5 receives the ultrasound wave signal that sends from leak, converts it to electric signal output; High frequency prime amplifier 6 is given amplification with the electric signal of receiving sensor output; Arrowband radio-frequency amplifier 7 carries out narrow-band filtering and amplification, to get rid of the outer all interference signals of hundred He Zhi magnitude bandwidth frequency; Frequency mixer 8 carries out frequency transformation, the 40KHz ultrasonic signals is converted to the audio signal output that can listen; Local oscillation circuit 9 provides frequency mixer required mixing local frequency, the difference frequency signal of frequency mixer 8 outputs and local frequency.Amplified by note amplifier 10 then, deliver to leakage volume indicator 11 and go reading and monitoring.The present invention adopts two kinds of forms of optoacoustic to indicate the intensity of leakage and the location of leakage point.
Characteristics of the present invention are:
1, supersonic leak detector of the present invention adopts the narrow-band reception technique, and its frequency span is 40KHz ± 2 ‰ (hundred He Zhi magnitudes).Improved the antijamming capability and the resolution of instrument effectively, enlarged range of application, in the environment of noise is arranged, can successfully detect and locate.
2, owing to adopt the narrow-band reception technique, improved and detected the sensitivity of leaking, can reach≤0.5 millimicro crust.
3, owing to adopt narrow-band to receive, can use the receiving sensor of any form of broadband or narrow-band, solve the versatility of sensor, reduce cost.
4, ultrasonic leak detection signal generator owing to increased intermittently signal generator, can produce working methods continuous and two kinds of ultrasonic leakages of simulation intermittently, has enlarged the leak detection application.
5, instrument volume of the present invention is little, can singlehanded carry out whole detecting operation work.
Description of drawings:
Fig. 1 is the inner structure block diagram;
Fig. 2 is the wiring diagram of ultrasonic leak detection signal generator;
Fig. 3 and Fig. 4 are the wiring diagram of supersonic leak detector.
Be further described in conjunction with the accompanying drawings.
Fig. 1 is a narrow frequency band supersonic leak detector inner structure block diagram.Partly form by ultrasonic leakage signal generator and supersonic leak detector two.Ultrasonic leakage signal generator, comprise signal generator 1, intermittently signal generator 2, power amplifier 3, ultrasonic generator 4, supersonic leak detector comprises receiving sensor 5, high frequency prime amplifier 6, arrowband radio-frequency amplifier 7, frequency mixer 8, local oscillation circuit 9, note amplifier 10, leaks volume indicator 11.
Fig. 2 is a ultrasonic leak detection signal generator wiring diagram of the present invention.Wherein signal generator 1 is by 2 resistance R
1, R
3, 1 variable resistor R
2, 1 capacitor C
1And IC
03 interior phase inverter F
4, F
5, F
6Form.Constitute multivibrator and produce vibration, its frequency is by R
2, R
3And C
1Adjust, transfer to 40KHz; Phase inverter F
6Make the output isolation level.Intermittently signal generator 2 is by 2 resistance R
4, R
5, 1 capacitor C
2And IC
03 interior phase inverter F
1, F
2, F
3Form.Phase inverter F
1, F
2Produce the interrupted oscillation signal of 1～3 He Zhi, phase inverter F
3Also doing output isolates.Power amplifier 3 is by 1 autotransformer B
1, 1 gauge tap K, 2 resistance R
6, R
7, 1 capacitor C
3, 1 diode BG
1, 1 triode BG
2, 1 stabilivolt BG
3With 1 light emitting diode BG
4Form.Gauge tap K is used for selecting different mode of operations, and K is the continuous wave mode of operation when disconnecting, and exports continuous 40KHz ultrasound wave signal; K is the discontinuous operation pattern when closed, exports the 40KHz ultrasonic signals discontinuously.Triode BG
2Electric signal is amplified back output.Autotransformer B
1Make impedance matching usefulness, with piezoelectric supersonic emission sensor T
1Be complementary.Light emitting diode BG
4The double as supply voltage is indicated automatically, does the indication of the mode of operation mode of this instrument again.Resistance R
7With voltage stabilizing diode BG
3, capacitor C
3Voltage stabilizing output is provided, makes IC
0Stable operating voltage, oscillation frequency also just can be stablized.Ultrasonic generator 4 is by 1 piezoelectric supersonic emission sensor T
1With 1 capacitor C
4Form the leakage ultrasonic signal of launching simulation.E among Fig. 2
1Power-supply battery for this instrument; K
1Be power switch; C
5Be power filtering capacitor.
Fig. 3 is high frequency amplification, filtering and the frequency conversion part of supersonic leak detector.Wherein receive sensing by 1 piezoelectric supersonic receiving sensor LP
1With 1 resistance R
8Form, be used for receiving the ultrasonic signals of leak, convert electric signal output again to.High frequency prime amplifier 6 is by 1 integrated circuit (IC)
1, 5 capacitor C
6, C
7, C
8, C
9, C
10, 4 resistance R
9, R
10, R
11, R
13, 1 variable potentiometer R
12, 1 stabilivolt BG
5Form.Capacitor C
7, C
8, C
9And resistance R
9, R
10, R
11Form feedback circuit, make IC
1The amplifier steady operation.Variable potentiometer R
12For the gain control of complete machine is regulated the detection sensitivity that is used for regulating this leak locator.Voltage stabilizing diode BG
5And capacitor C
10Be IC
1Stable voltage is provided.Arrowband radio-frequency amplifier 7 is by 1 piezoelectricity narrow band filter X
1, 1 tuned amplifier IC
2, 1 tuned transformer B
2, 4 capacitor C
11, C
12, C
13, C
14With 5 resistance R
14, R
15, R
16, R
17, R
18Form.Electric signal is through variable potentiometer R
12Export piezoelectricity narrow band filter X to
1Carry out narrow-band filtering, and then deliver to IC
2Carry out tuning amplification, again from tuned transformer B
2The secondary frequency mixer that exports to.Frequency mixer 8 is by 1 integrated circuit (IC)
3, 6 capacitor C
15, C
16, C
17, C
18, C
19, C
20, 2 resistance R
19, R
20With 1 outputting inductance B
4Form.From tuned transformer B
2Secondary next high frequency amplifies signal IC in addition
3Carry out frequency conversion, the audio signal after the frequency conversion is by outputting inductance B
4Output, 4 capacitor C
15, C
16, C
17, C
18With 2 resistance R
19, R
20Play filtering, coupling and attenuation, improve its audio frequency output signal.Local oscillation circuit 9 is by 1 integrated circuit (IC)
4, 1 local oscillator coil of wire B
3With 2 capacitor C
21, C
22Form.Local frequency is by coil of wire B
3And capacitor C
21Adjust, be frequency mixer IC
3Provide local frequency, capacitor C
22Play the power supply filter action.
Fig. 4 is for the audio-frequency amplification and the leakage intensity prison of supersonic leak detector show, the reading part.Note amplifier 10 is by 1 integrated amplifier IC
5, 3 capacitor C
23, C
24, C
25With 2 resistance R
21, R
22, horn switch K
2, power switch K
3With power-supply battery E
2Form.Audio signal is from IC
5Input is again by capacitor C
25Output and R
21And R
22Dividing potential drop output.Leak volume indicator 11 by 15 light indication ic chip
6, 5 LEDs
1～5, 4 resistance R
23, R
24, R
25, R
26, 3 capacitor C
26, C
27, C
28, 1 loudspeaker SP and 1 external headset plug J
1Form.Loudspeaker SP is used for monitoring and leaks signal, finds to leak with this.LED
1～5Be that 5 grades of logarithms leak the indication of intensity reading, with the intensity that expression is leaked, the automatic indication of going back the double as cell voltage simultaneously.
Claims (2)
1, a kind of narrow frequency supersonic leak detector, form by ultrasonic leak detection signal generator and supersonic leak detector two parts, the ultrasonic leak detection signal generator, comprise signal generator 1, power amplifier 3, ultrasonic generator 4, supersonic leak detector, comprise receiving sensor 5, high frequency prime amplifier 6, frequency mixer 8, local oscillation circuit 9, note amplifier 10, leak volume indicator 11, it is characterized in that the ultrasonic leak detection signal generator also is provided with intermittently signal generator 2, produces the modulation 40KH of 1～3 He Zhi
ZUltrasonic signals, supersonic leak detector have also been set up arrowband radio-frequency amplifier 7, carry out narrow-band filtering and amplification, to get rid of the outer noise of hundred He Zhi magnitude bandwidth frequency.
2, narrow frequency band supersonic leak detector according to claim 1 is characterized in that described arrowband radio-frequency amplifier 7, by 1 piezoelectricity narrow band filter X
1, 1 tuned amplifier IC
21 tuned transformer B
2, 4 capacitor C
11, C
12, C
13, C
14With 5 resistance R
14, R
15, R
16, R
17, R
18Form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87101132 CN1006407B (en) | 1987-11-19 | 1987-11-19 | Narrow frequency band supersonic leak detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87101132 CN1006407B (en) | 1987-11-19 | 1987-11-19 | Narrow frequency band supersonic leak detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1034267A true CN1034267A (en) | 1989-07-26 |
| CN1006407B CN1006407B (en) | 1990-01-10 |
Family
ID=4813207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87101132 Expired CN1006407B (en) | 1987-11-19 | 1987-11-19 | Narrow frequency band supersonic leak detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1006407B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102192407A (en) * | 2011-04-28 | 2011-09-21 | 煤炭科学研究总院重庆研究院 | Ultrasonic leakage detector for gas exhaust pipe for coal mine |
| CN104490365A (en) * | 2015-01-12 | 2015-04-08 | 南京大学 | Method for rebuilding broad-band photo-acoustic image by using narrow-band sensor |
| CN104902398A (en) * | 2015-05-29 | 2015-09-09 | 国家电网公司 | Helmet |
| CN106908755A (en) * | 2017-03-01 | 2017-06-30 | 西安电子科技大学 | Wireless acoustic sensor network pushes the sound bearing method of estimation of contracting gas leakage |
| CN111551321A (en) * | 2020-06-14 | 2020-08-18 | 荆门汇易佳信息科技有限公司 | Airtight container leakage positioning and measuring system based on ultrasonic detection |
-
1987
- 1987-11-19 CN CN 87101132 patent/CN1006407B/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102192407A (en) * | 2011-04-28 | 2011-09-21 | 煤炭科学研究总院重庆研究院 | Ultrasonic leakage detector for gas exhaust pipe for coal mine |
| CN104490365A (en) * | 2015-01-12 | 2015-04-08 | 南京大学 | Method for rebuilding broad-band photo-acoustic image by using narrow-band sensor |
| CN104902398A (en) * | 2015-05-29 | 2015-09-09 | 国家电网公司 | Helmet |
| CN106908755A (en) * | 2017-03-01 | 2017-06-30 | 西安电子科技大学 | Wireless acoustic sensor network pushes the sound bearing method of estimation of contracting gas leakage |
| CN106908755B (en) * | 2017-03-01 | 2019-03-26 | 西安电子科技大学 | Wireless acoustic sensor network pushes the sound bearing estimation method of contracting gas leakage |
| CN111551321A (en) * | 2020-06-14 | 2020-08-18 | 荆门汇易佳信息科技有限公司 | Airtight container leakage positioning and measuring system based on ultrasonic detection |
| CN111551321B (en) * | 2020-06-14 | 2021-12-03 | 南昌市燃气集团有限公司 | Measuring method of airtight container leakage positioning measuring system based on ultrasonic detection |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1006407B (en) | 1990-01-10 |
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