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Piezoelectric microactuator testing using heat-assisted capacitance measurement
Author(s)
Date Issued
September 6, 2016
Type
Conference Paper
Abstract
A technique for testing a piezoelectric microactuator of a read/write head of hard disk drive (HDD) is described. The proposed technique is based on the measurement of an equivalent capacitance of the PZT thin-film ceramic. It exploits the temperature dependent characteristic of the PZT. By carefully heating the PZT element while measuring its capacitance, the variation of its capacitance value can be observed. This profile is used to distinguish between a non-defected and a defected PZT actuator. The technique was implemented using a 5-watt green laser as the heating source. Experimental results show that when test with a HDD head stack assembly which is composed of multiple PZT actuators connected in parallel, it can identify a failed PZT actuator within seconds.
Citation
2016 13th International Conference on Electrical Engineering Electronics Computer Telecommunications and Information Technology Ecti Con 2016, 2016
Subjects