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| research:contact_mics [2017/03/19 01:29] – [Credits] mrkva | research:contact_mics [2017/03/19 13:21] – [Resonance] mrkva |
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| ==== Resonance ==== | ==== Resonance ==== |
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| Piezos do not detect vibration frequencies in a linear manner. Although they can have an extended frequency range, they have a characteristic resonance that varies with the diameter of the disc. This resonance is usually between 2 and 6 kHz, producing a "metallic" or "honky" sound. The resonance can be reduced by increasing the mass of the disc. However, this can adversely affect the overall sensitivity of the element. A good strategy is to increase the mass of the metallic part, while not excessively loading the central ceramic portion. | Disc piezos do not detect vibration frequencies in a linear manner. Although they can have an extended frequency range, they have a characteristic resonance that varies with the diameter of the disc. This resonance is usually between 2 and 6 kHz, producing a "metallic" or "honky" sound. The resonance can be reduced by increasing the mass of the disc. However, this can adversely affect the overall sensitivity of the element. A good strategy is to increase the mass of the metallic part, while not excessively loading the central ceramic portion. |
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| A comparison of two different bodies is demonstrated in the following video. Notice the "tone" of the piezo without additional mass: | A comparison of two different bodies is demonstrated in the following video. Notice the "tone" of the piezo without additional mass: |