Frequency Constant
2022-07-25 14:16
When an unrestrained piezoelectric ceramic element is exposed to a high frequency alternating electric field, an impedance minimum, the planar or radial resonance frequency, coincides with the series resonance frequency, fs. The relationship between the radial mode resonance frequency constant, NP , and the diameter of the ceramic element, D
, is expressed by:
NP = fs D
At higher resonance, another impedance minimum, the axial resonance frequency, is encountered. The thickness mode frequency constant, NT , is related to the thickness of the ceramic element, h, by:
NT = fs h
A third frequency constant, the longitudinal mode frequency constant, is related to the length of the element:
NL = fs l
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