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I have a bunch of piezo elements, that I want to use as "Mics", for that I will test their reaction in a Anechoic chamber. My question is what the are characteristics that I can measure that describe those elements and can help me analysing the generated sound later, I already have in mind the following :

  • Amplitude response
  • Phase response

Thanks for any help in advance !

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  • $\begingroup$ and why the down vote ??? $\endgroup$ – Engine Oct 6 '14 at 14:47
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Mainly frequency response as a function of the 3D direction of incidence. Also known as "polar pattern" or "polar balloon". You can also look at distortion and noise but that's more tricky.

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I don't know how you wanted to mount these, but definitely you should take a look at IEC 60268-4 standard (if you search net carefully you will find copy). Nevertheless parameters of your interest might be:

  • Frequency response
  • Sensitivity
  • Directional pattern
  • Front-to-rear sensitivity index
  • Total harmonic distortion
  • Equivalent SPL (EIN)
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