WO1995025264B1 - Apparatus and method for detecting ultrasonic waves propagated from within a selected distance - Google Patents
Apparatus and method for detecting ultrasonic waves propagated from within a selected distanceInfo
- Publication number
- WO1995025264B1 WO1995025264B1 PCT/US1995/002904 US9502904W WO9525264B1 WO 1995025264 B1 WO1995025264 B1 WO 1995025264B1 US 9502904 W US9502904 W US 9502904W WO 9525264 B1 WO9525264 B1 WO 9525264B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- intensity
- signal
- ultrasonic waves
- signals
- intensity ratio
- Prior art date
Links
- 230000000644 propagated Effects 0.000 title claims 9
- 238000001514 detection method Methods 0.000 claims abstract 12
- 230000000007 visual effect Effects 0.000 claims abstract 2
- 230000000875 corresponding Effects 0.000 claims 3
- 238000000034 method Methods 0.000 claims 2
Abstract
An ultrasonic leak detector (10) which discriminates against leak signals originating from outside a desired detection zone. Incoming ultrasonic waves are divided into mutually exclusive low (30) and high (31) frequency signals which are processed to form an intensity ratio (24). The intensity ratio is compared to a pre-selected ratio (25), and the leak signals originating from outside the desired detection zone are ignored. The presence of a leak is indicated by audio (29, 34) and visual (34) devices.
Claims
AMENDED CLAIMS
[received by the International Bureau on 26 September 1995 (26.09.95); original claims 1-9 replaced by amended claims 1-18 (8 pages)] An ultrasonic Wave detection apparatus, comprising: means for detecting ultrasonic waves and generating a first input signal responsive to said ultrasonic waves of a selected low frequency and for generating a second input signal responsive to said ultrasonic waves of a selected high frequency, wherein said selected low and high frequencies are mutually exclusive; means for processing said first input signal to produce a first frequency signal and a first intensity signal indicative of the frequency and the intensity, respectively, of said first input signal and for processing said second input signal to produce a second frequency signal and a second intensity signal indicative of the frequency and the intensity, respectively, of the second input signal; means for continuously comparing said first and second intensity signals and producing a third signal indicative of an intensity ratio of the first and second intensity signals; means for selecting a distance from the detection apparatus wherein only ultrasonic waves propagated from a source located within said desired distance will be indicated by said apparatus; means for generating a fourth signal indicative of an expected intensity ratio corresponding to low frequency and high frequency ultrasonic waves propagated from a source located at said selected distance from said apparatus; means for continuously comparing said third signal and said fourth signal, and when a predetermined relationship exists between said intensity ratio of said first and second intensity signals and said expected ratio signal, producing a fifth signal representative of the intensity of at least one of said first and second intensity signals; means for processing at least one of said first and second frequency signals and said fifth signal to produce an output signal; and notification means responsive to said output signal for producing an output indicative of at least one of said first and second input signals propagated from a source located within said selected distance of said apparatus without interference.
2. The apparatus according to claim 1, wherein said detection means comprises a low frequency detecting means for producing said first input signal and a high frequency detection means for producing said second input signal.
3. The apparatus according to claim 1, wherein said processing means comprises a low frequency processing means to process said first input signal and a high frequency processing means to process said second input signal.
4. The apparatus according to claim 1, wherein said notification means comprises at least one of a visual indicator and an audible indicator.
5. The apparatus according to claim 1, wherein said fourth signal generating means comprises: means for storing at least one said expected intensity ratio; and means for accessing said at least one expected intensity ratio in response to the selection of said selected distance by said selecting means.
6. The apparatus according to claim 5, wherein said storing means comprises a programmable read only memory (PROM) chip.
7. The apparatus of claim 1, wherein said fifth signal is representative of an average of said first and second intensity signals .
8. The apparatus of claim 1, wherein said notification means produces an output indicative of an average of said first and second frequency signals and an average of said first and second intensity signals.
9. The apparatus of claim 1, wherein when said intensity ratio of said first and second intensity signals is greater than or equal to said expected intensity ratio, said fifth signal is directly related to at least one of said first and second intensity signals.
10. The apparatus of claim 10, wherein when said intensity ratio of said first and second intensity signals is less than the expected intensity ratio and greater than or equal to said expected intensity ratio less a selected percentage, said fifth signal's amplitude is proportionally greater than at least one of said first and second intensity signals.
11. The apparatus in claim 11, wherein when said intensity ratio of said first and second intensity signals is less than the expected intensity ratio less a selected percentage, said fifth signal's amplitude is zero and no output signal is produced.
12. An ultrasonic wave detection method comprising the steps of: detecting ultrasonic waves and generating a first input signal produced responsive to said ultrasonic waves of a selected low frequency and generating a second input signal produced responsive to said ultrasonic waves of a selected higher frequency, wherein said selected low and high frequencies are mutually exclusive; processing said first input signal to produce a first frequency signal and a first intensity signal indicative of the frequency and the intensity, respectively, of said first input signal and processing said second signal to produce a second input frequency signal and a second intensity signal indicative of the frequency and the intensity, respectively, of the second input signal; continuously comparing said first and second intensity signals and producing a third signal indicative of an intensity ratio of the first and second intensity signals; selecting a distance from a detection apparatus which detects said ultrasonic waves wherein only ultrasonic waves propagated from a source located within said selected distance from said apparatus will be indicated; generating a fourth signal indicative of an expected intensity ratio corresponding to low frequency and high frequency ultrasonic waves propagated from a source located at said selected distance from the point of detection of the ultrasonic waves; continuously comparing said third signal to said fourth signal and, when a predetermined relationship exists between said intensity ratio of said first and second intensity signals and said expected intensity ratio, producing a fifth signal representative of at least one of said first and second intensity signals; processing said first and second frequency signals and said fifth signal to produce an output signal; and producing an output responsive to said output signal indicative of at least one of said first and second input signals propagated from a source located within said selected distance.
13. The method of claim 13, wherein when said intensity ratio of said first and second intensity signals is greater than or equal to the expected intensity ratio, said fifth signal is directly related to at least one of said first and second intensity signal.
14. The method of claim 14, wherein when said intensity ratio of said first and second intensity signals is less than the expected intensity ratio and greater than or equal to said expected intensity ratio less a selected percentage, said fifth signal's amplitude is proportionally greater than at least one of said first and second intensity signals.
15. The method in claim 15, wherein when said intensity ratio of said first and second intensity signals is less than the expected intensity ratio less a selected percentage, said fifth signal's amplitude is zero and no output signal is produced.
16. The method of claim 13, wherein said fifth signal is representative of an average of said first and second intensity signals.
17. An ultrasonic wave detection apparatus comprising: means for detecting ultrasonic waves and generating a first input signal responsive to said ultrasonic waves of a selected low frequency and for generating a second input signal responsive to said ultrasonic waves of a selected high frequency, wherein said selected low and high frequencies are mutually exclusive; means for processing said first input signal to produce a first intensity signal indicative of the intensity of said first input signal and for processing said second input signal to produce a second intensity signal indicative of the intensity of the second input signal; means for continuously comparing said first and second intensity signals and producing a third signal indicative of an intensity ratio of the first and second intensity signals; means for selecting a distance from the detection apparatus within which sources of ultrasonic waves are to be indicated to the exclusion of sources beyond said distance; means for generating a fourth signal indicative of an expected intensity ratio corresponding to low frequency and high frequency ultrasonic waves propagated from a source located at said selected distance from said apparatus; means for continuously comparing said third signal and said fourth signal, and when a predetermined relationship exists between said intensity ratio of said first and second intensity signals and said expected intensity ratio exists, producing a fifth signal indicative of at least one of said first and second intensity signals; and notification means responsive to said fifth signal for producing an output indicative of at least one of said first and second intensity signals propagated from a source located within said selected distance of said apparatus without interference.
18. A method of identifying ultrasonic waves originating within a predetermined distance, comprising the steps of: sensing ultrasonic waves having a high frequency component and a low frequency component; separately determining an intensity of the high frequency component and an intensity of the low frequency component; generating a first ratio of the intensity of the high frequency ultrasonic waves to the intensity of the low frequency ultrasonic waves; generating a second ratio indicative of the expected intensity ratio at said predetermined distance; and comparing continuously said first and second ratios and producing an output signal indicative of the detection of ultrasonic waves within said predetermined distance when a predetermined relationship between said first and second ratios exists .
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7524079A JPH09506974A (en) | 1994-03-15 | 1995-03-10 | Device and method for detecting ultrasonic waves propagated from a selected distance |
| EP95912805A EP0750737A1 (en) | 1994-03-15 | 1995-03-10 | Apparatus and method for detecting ultrasonic waves propagated from within a selected distance |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US21312994A | 1994-03-15 | 1994-03-15 | |
| US08/213,129 | 1994-03-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1995025264A1 WO1995025264A1 (en) | 1995-09-21 |
| WO1995025264B1 true WO1995025264B1 (en) | 1995-10-26 |
Family
ID=22793833
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1995/002904 WO1995025264A1 (en) | 1994-03-15 | 1995-03-10 | Apparatus and method for detecting ultrasonic waves propagated from within a selected distance |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5557969A (en) |
| EP (1) | EP0750737A1 (en) |
| JP (1) | JPH09506974A (en) |
| WO (1) | WO1995025264A1 (en) |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5719785A (en) * | 1994-05-17 | 1998-02-17 | Standifer; Larry R. | Detection and quantification of fluid leaks |
| US5650943A (en) * | 1995-04-10 | 1997-07-22 | Leak Detection Services, Inc. | Apparatus and method for testing for valve leaks by differential signature method |
| US6098463A (en) * | 1997-02-18 | 2000-08-08 | Etymotic Research, Inc. | Method and apparatus for measurement of wide dynamic range signals |
| US5979239A (en) * | 1997-04-28 | 1999-11-09 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Ultrasonic imaging system |
| US6128946A (en) * | 1997-06-26 | 2000-10-10 | Crane Nuclear, Inc. | Method and apparatus for on-line detection of leaky emergency shut down or other valves |
| US6301967B1 (en) * | 1998-02-03 | 2001-10-16 | The Trustees Of The Stevens Institute Of Technology | Method and apparatus for acoustic detection and location of defects in structures or ice on structures |
| US6234021B1 (en) | 1999-02-02 | 2001-05-22 | Csi Technology, Inc. | Enhanced detection of vibration |
| GB2358246A (en) * | 2000-01-05 | 2001-07-18 | Palmer Environmental Ltd | Determining the position of a signal from a pipe |
| US20020073768A1 (en) * | 2000-09-01 | 2002-06-20 | Joynes George Malcolm Swift | Fluid flow sensors & leak detection systems |
| GB2369677B (en) * | 2000-09-01 | 2002-10-30 | Roke Manor Research | Improvements in or relating to fluid flow sensors & leak detection systems |
| IT1320660B1 (en) * | 2000-09-22 | 2003-12-10 | Co L Mar S R L | METHOD FOR DETECTING LOSSES FROM SUBMERGED CONDUCT. |
| WO2005031206A1 (en) * | 2003-09-26 | 2005-04-07 | Ansul Canada Ltd. | Method and apparatus for producing an rf cured hose, and the hose so produced |
| US7213630B2 (en) * | 2003-09-26 | 2007-05-08 | Hydro-Quebec Ltee | Method and apparatus for producing an RF cured hose, and the hose so produced |
| CN1932456A (en) * | 2005-09-16 | 2007-03-21 | 鸿富锦精密工业（深圳）有限公司 | Low-frequency wave rate measuring system and method |
| US20070068225A1 (en) | 2005-09-29 | 2007-03-29 | Brown Gregory C | Leak detector for process valve |
| US7698946B2 (en) | 2006-02-24 | 2010-04-20 | Caterpillar Inc. | System and method for ultrasonic detection and imaging |
| NO331105B1 (en) * | 2007-04-30 | 2011-10-10 | Nat Oilwell Norway As | A method for detecting a malfunction of a fluid impacted component of a piston machine |
| IL185184A0 (en) * | 2007-08-09 | 2008-03-20 | Elta Systems Ltd | Method and apparatus for detecting pedestrians |
| GB0813014D0 (en) * | 2008-07-16 | 2008-08-20 | Groveley Detection Ltd | Detector and methods of detecting |
| US10028250B2 (en) * | 2011-07-29 | 2018-07-17 | Google Technology Holdings LLC | Interference mitigation in an accessory for a wireless communication device |
| EP2938990A4 (en) | 2012-12-27 | 2016-06-01 | Score Group Plc | Systems and methods for determining a leak rate through an opening using acoustical sensors |
| RU2615093C1 (en) * | 2016-01-26 | 2017-04-03 | ЗАО "Аэрокосмический мониторинг и технологии" | Method for detecting and quantifying violations of minimal distances in areas of hazardous gas pipeline production facilities |
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| NL6609733A (en) * | 1966-07-12 | 1968-01-15 | ||
| FR1530919A (en) * | 1966-07-12 | 1968-06-28 | Shell Int Research | equipment and method for testing pipelines for leaks |
| US3903729A (en) * | 1970-12-30 | 1975-09-09 | Taft Broadcasting Corp | Method and apparatus for detecting a break or other occurrence in a pipeline containing gas under pressure |
| US3930556A (en) * | 1971-04-26 | 1976-01-06 | Osaka Gas Kabushiki Kaisha | Method of detecting leak of fluid from a long pipeline |
| US4201092A (en) * | 1977-09-06 | 1980-05-06 | Electric Power Research Institute, Inc. | Method of detecting and monitoring a leak caused by a through wall crack in a high pressure fluid system |
| US4289019A (en) * | 1979-10-30 | 1981-09-15 | The United States Of America As Represented By The United States Department Of Energy | Method and means of passive detection of leaks in buried pipes |
| US4287581A (en) * | 1980-02-19 | 1981-09-01 | Neale Sr Dory J | Ultrasonic fluid leak detector |
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-
1995
- 1995-03-10 WO PCT/US1995/002904 patent/WO1995025264A1/en not_active Application Discontinuation
- 1995-03-10 EP EP95912805A patent/EP0750737A1/en not_active Ceased
- 1995-03-10 JP JP7524079A patent/JPH09506974A/en active Pending
- 1995-06-27 US US08/495,099 patent/US5557969A/en not_active Expired - Fee Related
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