I am doing AE experiment in FRC concrete by keeping the threshold as 30 db (as low as possible to get maximum number of hits without noise). I want to verify whether the AE data obtained is correct or not. Is there any standard process for AE data validation.
Dear Abhijit Sardar
Recently, T. Fowler, in his paper, ASME issued a code procedure for AE testing of a metal vessel (3) based on the industry experience, especially in France, the United Kingdom and the United States. The evaluation criteria based on emission during load hold and MARSE (Measured Area of the Rectified Signal Envelope), which means exactly the same as energy, appear as important criteria to evaluate the severity of discontinuities. The facts presented up to here bring an important contribution to the AE technique, applied as NDT since they will turn the test routine into a less difficult practice to be performed.
https://www.sciencedirect.com/science/article/pii/B9780444874504501168
Have you done the pencil lead breakage experiment in a simple material specimen?
The threshold level depends strongly on what material system you are looking at in general. Composites will produce a high level of incoherent (but structured) noise. I would suggest testing at small distances and going farther and father but I guess you can't go too far because of the large attenuation. After all, this will be very much like empirical where some preliminary efforts are required. Good luck!
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