| EPSRC Reference: |
GR/J30080/01 |
| Title: |
OPTICAL INSTRUMENTATION FOR LASER-ULTRASOUND DEFECT IMAGING IN ENGINEERING MATERIALS |
| Principal Investigator: |
Dewhurst, Professor R |
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| Department: |
Instrumentation & Analytical Science |
| Organisation: |
UMIST |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
01 February 1994 |
Ends: |
31 January 1996 |
Value (£): |
112,360
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| EPSRC Research Topic Classifications: |
| Instrumentation Eng. & Dev. |
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Summary on Grant Application Form |
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Optical instrumentation will be developed for laser-ultrasound defect imaging in engineering materials. For ultrasonic C-scan imaging in the frequency range 1-40 MHz, the optical system will be based on a Nd:YAG laser and Ar-ion laser, using a Confocal Fabry-Perot (CFP) interferometer to sense the ultrasound. By using analogue circuitry before signal digitisation, system integration will be simplified, leading to a reduced amount of information required for imaging purposes. Acquisition time for data from each pixel will be reduced from 15 secs to a time limited by the laser repetition rate of 10,Ha. The interferometer will include a new optical detector arrangement, with light monitored simultaneous in reflection and transmission. This scheme is likely to improve overall system sensitivity by at least a factor of three. The system will be used for the non-destructive testing of engineering materials, namely adhesively-bonded aluminium joints and carbon fibre composite samples. Some C-scan images of known defects will be compared with measurements using conventional methods, from which it will be possible to assess the relative merits of laser-based ultrasound techniques.
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Key Findings |
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Potential use in non-academic contexts |
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
| Summary |
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| Date Materialised |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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