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What Determines a Transducer's operational frequency?

SensoredHacker0

I have to build a device using a transducer, operating between 10KHz and 30KHz.
What Im not sure about is if all these solid state transducers differ only by the driver circuit frequency, or if there is some spec that I should pay attention to. 
Ill also take parts recommendations. 1-5 watts preferably.

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  • I'm looking to send a signal, but I dont know the precise frequency.
    So Im wondering if the frequency is a strict physical property from the construction of a piezo electric, or other sorts of transducers,
    or a range of frequencies.

  • in reply to SensoredHacker0

    Please explain what you are trying to do with a bit more detail.

    Do you have a signal in mind - what kind of information are you trying to send.

    Do you have a transducer in mind - there are probably millions to choose from.

    Most low cost ultrasonic air coupled piezo electric transducers are high Q resonant devices with a narrow bandwidth - they only work over a narrow frequency band. Different transducers are available for different frequencies. The lowest cost easily obtainable ones work at about 40kHz.

    Moving coil loudspeakers are also air coupled transducers and small ones can manage maybe 500Hz to 20kHz  - which is a big frequency range but rarely used for other than audio signalling - like speech and music. (Larger speakers an work at low frequencies but struggle for the high end.).

    MK

  • in reply to michaelkellett

    its not like communication, its more like trying to resonate an object, and detect the resonating.
    The reason Im not sure what the signal is exactly, is the material has natural variations that cause the resonate frequency to occur within a range of frequencies.

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