Receiving very less number of hits and events in acoustic emission tests?

14 February 2021 1 3K Report

I am doing a three point bend test with concrete specimen of dimension 280mm*90mm*90mm. I am putting 2 sensors near the notch with 3cms away from both the sides. the experiment ran for 20 mins but i am getting either 50 or 90 hits with 1 or 2 events. I am not understanding what the problem is. I have set threshold = 40 , gain = 40db when I am doing lead break test I am getting hits from both sensors events are obtained sporadically. HDT,PDT and HLT values are kept by default which are suitable for concrete. So I do not understand what is the problem. Please I need help

Félix Leaman

Hello Abhijit Sardar

- Can you provide some plots to see how the signals look like?

- Did you add some coupling agent between sensor and surface to improve acoustic coupling?

- Did the specimen suffer cracking during the experiment?

- Maybe the threshold is too high?

- Which values HDT, PDT and HLT did you selected?

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