CA2510507A1 - System and method for multiple mode flexible excitation in sonic infrared imaging - Google Patents
System and method for multiple mode flexible excitation in sonic infrared imagingInfo
- Publication number
- CA2510507A1 CA2510507A1 CA002510507A CA2510507A CA2510507A1 CA 2510507 A1 CA2510507 A1 CA 2510507A1 CA 002510507 A CA002510507 A CA 002510507A CA 2510507 A CA2510507 A CA 2510507A CA 2510507 A1 CA2510507 A1 CA 2510507A1
- Authority
- CA
- Canada
- Prior art keywords
- input signal
- signal
- defects
- frequency
- vibration sensor
- 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.)
- Granted
Links
Abstract
A defect detection system (10) for thermally imaging a structure (12) that has been energized by a sound energy. The system (10) includes a transducer (14) that couples a sound signal into the structure (12), where the sound signal causes defects in the structure (12) to heat up. In one embodiment, the sound signal has one or more frequencies that are at or near an eigen-mode of the structure (12). In another embodiment, a non-linear coupling material (16) is positioned between the transducer (14) and the structure (12) to couple the sound energy from the transducer (14) to the structure (12). A predetermined force (26) is applied to the transducer (14) and a pulse duration and a pulse frequency of the sound signal are selected so that the sound energy induces acoustic chaos in the structure (12), thus generating increased thermal energy. A thermal imaging camera (22) images the structure (12) when it is heated by the sound signal.
Claims (20)
1. A defect detection system for detecting defects in a structure, said system comprising:
a sound source for applying a sound input signal to the structure, said input signal to the structure, said input signal including a plurality of frequency signals having different frequencies, said input signal heating the defects in the structure;
and a thermal imaging camera for generating thermal images of the structure to identify the defects.
a sound source for applying a sound input signal to the structure, said input signal to the structure, said input signal including a plurality of frequency signals having different frequencies, said input signal heating the defects in the structure;
and a thermal imaging camera for generating thermal images of the structure to identify the defects.
2. The system according to claim 1 wherein the input signal is a combination of two or more frequency signals centered at different frequencies.
3. The system according to claim 1 wherein the input signal has a Gaussian frequency band.
4. The system according to claim 1 wherein the input signal is a chirp-signal whose frequency changes in time.
5. The system according to claim 1 wherein the input signal is a signature signal having a set of pseudo-random pulses.
6. The system according to claim 1 wherein the input signal has an increasing, decreasing or constant amplitude in various sequential combination, including optionally steps in amplitude.
7. The system according to claim 1 wherein the input signal is based on a rectangular frequency band.
8. The system according to claim 1 wherein the input signal is a favoured envelope frequency including one pulse having a small pulse width and another pulse having a larger pulse width for detection of defects in different depths.
9. The system according to claim 1 wherein the sound source is selected from the group consisting of EMATs, ultrasonic vibrators, piezoelectric vibrators, electro-magnetic, vibrators and magneto-strictive vibrators.
10. The system according to claim 1 further comprising a signal shaper, said signal shaper generating the input signal to have a predetermined duration, amplitude and frequency.
11. The system according to claim 1 wherein the sound source is a broad-band transducer capable of providing a broad-band frequency signal.
12. The system according to claim 1 wherein the sound source includes a plurality of transducers each being tuned to different narrow band center frequency.
13. The system according to claim 1 further comprising a vibration sensor coupled to the structure, said vibration sensor sending vibrations in the structure.
14. The system according to claim 13, wherein the vibration sensor is selected from the group consisting of an eddy current based vibration sensor, an accelerometer, an optical vibration sensor, a microphone, an ultrasonic transducer and an ultrasonic vibration sensor.
15. The system according to claim 13 wherein the vibration sensor measures a phase shift between current and voltage of the sensed vibrations to determine the natural frequencies of the structure.
16. The system according to claim 13 wherein the vibration sensor measures an amplitude characteristic of current or voltage of the sensed vibrations to determine the natural frequencies of the structure.
17. The system according to claim 1 wherein the input signal is a tuned excitation signal that provides an open-loop or a closed loop control.
18. A defect detection system for detecting defects in a structure, said system comprising;
a sound source for applying a sound input signal to the structure, said input signal having one or more frequencies or a single frequency signal with an amplitude modulation selected to be at or near an eigen-mode of the structure or selected to avoid the eigen-mode of the structure, said input signal heating the defects in the structure; and a thermal imaging camera for generating thermal images of the structure to identify the defects.
a sound source for applying a sound input signal to the structure, said input signal having one or more frequencies or a single frequency signal with an amplitude modulation selected to be at or near an eigen-mode of the structure or selected to avoid the eigen-mode of the structure, said input signal heating the defects in the structure; and a thermal imaging camera for generating thermal images of the structure to identify the defects.
19. The system according to claim 18 wherein the input signal is selected from the group of input signals consisting of an input signal having a combination of two or more frequency signals centered at different frequencies, an input signal that has a Gaussian frequency band, an input signal that is a chirp-signal, an input signal that is a signature signal having a set of random pulses, an input signal that has a rectangular frequency band, an input signal that has an increasing amplitude with a step, and an input signal that includes one pulse having a short pulse duration and another pulse having a wide pulse duration for detection of defects in different depths.
20. A defect detection system for detecting defects in a structure, said system comprising:
a sound source for applying a sound input signal to the structure, said input signal being a single frequency signal with an amplitude modulation, said input signal heating the defects in the structure; and a thermal imaging camera for generating thermal images of the structure to identify the defects.
a sound source for applying a sound input signal to the structure, said input signal being a single frequency signal with an amplitude modulation, said input signal heating the defects in the structure; and a thermal imaging camera for generating thermal images of the structure to identify the defects.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US40720702P | 2002-08-28 | 2002-08-28 | |
| US60/407,207 | 2002-08-28 | ||
| US45343103P | 2003-03-10 | 2003-03-10 | |
| US60/453,431 | 2003-03-10 | ||
| CA2496935A CA2496935C (en) | 2002-08-28 | 2003-08-25 | System and method for acoustic chaos in sonic infrared imaging |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2496935A Division CA2496935C (en) | 2002-08-28 | 2003-08-25 | System and method for acoustic chaos in sonic infrared imaging |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2510507A1 true CA2510507A1 (en) | 2004-03-11 |
| CA2510507C CA2510507C (en) | 2010-05-04 |
Family
ID=34890686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2510507A Expired - Lifetime CA2510507C (en) | 2002-08-28 | 2003-08-25 | System and method for multiple mode flexible excitation in sonic infrared imaging |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2510507C (en) |
-
2003
- 2003-08-25 CA CA2510507A patent/CA2510507C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2510507C (en) | 2010-05-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20230825 |