Accelerometer_digitizer_piezoelectric

Published:2009/7/24 3:21:00 Author:Jessie | From:SeekIC

Fig. 14-1 This circuit is essentially a current-to-frequency converter that responds to ac input developed by an accelerometer, As shown In Fig. 14-1B, the piezoelectric accelerometer produces a damped sine-wave when subjected to acceleration (Trace A). This signal is converted to a signal output (Trace B), which keeps track of acceleration polarity. The frequency output (Trace C)supplies amplitude data. Note the drop In output frequency as the accelerometer wave-form damps. To trim, apply a known amplitude acceleration to the transducer and adjust the gain trim for the correct output frequency, Notice that the transducer manufacturer'datasheet shows means of simulating acceleration electrically, and it includes the necessary scale factors, Linear Technologv Linear Applications Handbook 1990 p AN-15,-16.



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