JPS6474446A - Ae crack detecting device - Google Patents
Ae crack detecting deviceInfo
- Publication number
- JPS6474446A JPS6474446A JP62232872A JP23287287A JPS6474446A JP S6474446 A JPS6474446 A JP S6474446A JP 62232872 A JP62232872 A JP 62232872A JP 23287287 A JP23287287 A JP 23287287A JP S6474446 A JPS6474446 A JP S6474446A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- autocorrelation
- detected
- noise
- result
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE:To accurately discriminate a signal and a noise by performing the autocorrelation of an AE signal detected by a sensor and judging whether the signal is a signal to be detected or noise from the area, pattern, or period of correlation obtained as a result. CONSTITUTION:Only a signal close to the AE signal due to a specific area, e.g. a crack among AE signals detected by the sensor 1 is stored as a digital signal in a memory 8. The stored digital signal is inputted to an autocorrelation arithmetic processing part 11 and product sum arithmetic operation between the time-series digital signal in the memory 8 and a signal which is delayed according to the signal is carried out for autocorrelation. The autocorrelation result is inputted to a signal processing part 12 to judge whether the signal is the signal to be detected or noise from the area, pattern, or period of the correlation as the arithmetic result.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62232872A JPS6474446A (en) | 1987-09-17 | 1987-09-17 | Ae crack detecting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62232872A JPS6474446A (en) | 1987-09-17 | 1987-09-17 | Ae crack detecting device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6474446A true JPS6474446A (en) | 1989-03-20 |
Family
ID=16946150
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62232872A Pending JPS6474446A (en) | 1987-09-17 | 1987-09-17 | Ae crack detecting device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6474446A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5398605A (en) * | 1993-08-18 | 1995-03-21 | Tokyo Kirai Seisakusho, Ltd. | Ink pump control system |
-
1987
- 1987-09-17 JP JP62232872A patent/JPS6474446A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5398605A (en) * | 1993-08-18 | 1995-03-21 | Tokyo Kirai Seisakusho, Ltd. | Ink pump control system |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE69011709T2 (en) | Device for detecting an acoustic signal. | |
JPS53120295A (en) | Subject discrimination device | |
DE68921518D1 (en) | Device for the detection of a photoacoustic signal. | |
EP0351430A4 (en) | Impact-type method and apparatus for inspecting structures | |
JPS6474446A (en) | Ae crack detecting device | |
JPS5491007A (en) | Audio recognition unit | |
JPS6425026A (en) | Detecting apparatus of leakage of water | |
EP0384960A3 (en) | Method for setting alarm and wave indicating sensitivity | |
JPS5491008A (en) | Audio recognition unit | |
JPS5238992A (en) | Continous flaw identification method for steel products | |
ES437399A1 (en) | Apparatus and method for detecting a moving metal mass including means to discriminate signals having a particular period | |
JPS55164355A (en) | Ae wave discriminating unit | |
GB1498847A (en) | Metal detector method and device | |
JPS6474444A (en) | Ultrasonic diagnosing method for lining refractory material | |
JPS5396865A (en) | Pulse detecting, measuring and processing circuit | |
JPS546594A (en) | Numerical value controlling ultrasonic flaw detecting system | |
JPS6491056A (en) | Ultrasonic measurement system | |
JPS6474445A (en) | Ae crack detecting device | |
JPS5788362A (en) | Device and method for detection of stress relief cracking | |
JPS53120329A (en) | Signal detection circuit | |
JPS53102773A (en) | Ultrasonic type vehicle detector | |
ATE393597T1 (en) | METHOD AND DEVICE FOR AUTOMATICALLY DETECTING MOTOR RESTRESS OF A TEST SUBJECT | |
JPS53107387A (en) | Method and apparatus for eddy current non-destructive flaw detection | |
JPS6489898A (en) | Sound signal existence detection device | |
JPS57132054A (en) | Flaw detector |