Electronic Signal Processing Techniques. Phase 3. Nondestructive Testing
Final rept. 15 Dec 1970-15 Dec 1971
BOEING AEROSPACE CO SEATTLE WA
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Correlation methods have been used to reduce surface roughness noise in eddy current and ultrasonic flaw detection systems. Titanium plates containing artificial flaws in the form of small drill holes and EDM slots have been ultrasonically inspected using multi-transducer techniques. It has been shown that cross-correlations formed between the various signals available significantly reduce the limiting background noise. A steel plate containing EDM slots has been inspected with an eddy current probe which produces four separate flaw detection signals. It has been shown that a quadruple product formed from these four signals reduces the background noise level. Initial tests indicate that coherent optical processing techniques are not likely to significantly enhance the clarity of marginal flaw signals on X-ray radiographs.
- Test Facilities, Equipment and Methods