Type of microphone for capturing acoustic emissions

AI Thread Summary
The discussion focuses on selecting the appropriate microphone for capturing acoustic emissions related to tool wear in a manufacturing process similar to milling. The researcher has previously used force data and aims to incorporate acoustic data, referencing existing studies that utilize FFTs to analyze acoustic signals. They express a need for a microphone capable of capturing high frequencies and are considering options like piezoelectrics, intensity acoustic sensors, and ultrasonics. Participants suggest that a search for high-frequency microphones might yield suitable products. The conversation emphasizes the importance of specifying frequency requirements for better recommendations.
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I am currently trying to incorporate the sensing of tool wear as part of my research, which is an investigation into an experimental manufacturing process that is probably most similar to milling. I have already been making use of force data, but would like to utilize acoustic data as well (there are a number of papers on detecting tool wear in milling which record the acoustic signals and then transform the data using FFTs). I would like to do something similar to this, but am unsure of what is the best type of microphone to purchase.

Based on previous experiments with a very crude standard-issue microphone, I think I need something that is capable of capturing high frequencies. Does anyone have any recommendations with regard to products or vendors? I have been looking at piezoelectrics, intensity acoustic sensors, and ultrasonics. My knowledge of acoustic sensing is very limited, so any help you could offer is much appreciated!
 
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How can we answer that if you don't tell us how high is high?

A simple search for high frequency microphones finds many hits. Do none of those meet your requirements?
 
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