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TUTORIAL Introduction to Piezoelectric Sensors

TUTORIAL Introduction to Piezoelectric Sensors

Discharge Time Constant

Discharge Time Constant (DTC)• Discharge Time Constant – the time required for theoutput voltage from a sensor to discharge to 37% ofits original value in response to a zero rise time stepfunction input‒ Determines sensor low frequency response• Low frequency response is approximately equal to:-3dB Point = .16/DTC-5% = -3dB Point x 3Dytran Instruments, Inc.34

Charge Mode Transducers• Usually ceramic based• No built-in electronics• Good for high temperature (+500°F)• Expensive signal conditioning• Low noise cable required for most applications• Charge amps are generally more difficult to use (i.e.setting scale factors, etc.)Dytran Instruments, Inc.35

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