Piezo elements and their Resonant Frequency
June 11, 2012
Ok, I was looking forward to stock up on piezos. Not particular plan in mind at the moment, but I just want to have them around when I need them. (shipping times are bothersome) So, I was looking for me most versatile ones.
Then, I've realized that I know next to nothing about piezos, but when looking around on ebay, what it seemed to vary was the size of them alonside with the resonant frequency.
So looking for resonant frequency of the piezos I've found:
which is a bit overkill, and has loads of info beyond the scope of pragmaticability (if that's a word).
found a more tractable answer at:
"For piezoelectric accelerometers whose mechanical structure is almost completely undamped, the amplitude of the resonant peak can be quite high, resulting in a sensitivity many times higher than that of the specified reference sensitivity (i.e. at 100 Hz). As such, any vibration at or near the frequency of the resonant peak will be highly amplified, resulting in distorted measurements and corrupted data. A design goal of manufacturers, then, is to push the resonance frequency point as high as possible in an accelerometer's structure, with intent that the point shall be well beyond any vibration frequencies of the user’s measurement application. The user also must ensure that no vibration frequency components are at or near the resonance frequency point."
While this is specific to piezoelectric accelerometers it leads me to believe, that higher resonant frequencies would be desirable.
so I should prefer
if I do not have size restrains, would that be so?
looked nicely priced and although not fully specced seemed similar to the latter (size-wise at least). They seem just like piezo discs in a box, if so they are more for less and they are located in europe which is a plus for me.
Anyhow, I would welcome a more pragmatical notion on the subject from any who might have experience and knowledge on the subject
many thanks :)