Investigating Distributed Sensor/Point Actuator Testbeds by Using Differential Laser Doppler Interferometer
Resource
AIAA Journal 39 (4): 697-703
Journal
AIAA Journal
Journal Volume
39
Journal Issue
4
Pages
697-703
Date Issued
2001
Date
2001
Author(s)
Abstract
The design principles, optical con gurations, and capabilities of a newly developed advanced vibrometer/interferometer device called AVID are presented.The fundamental principles of this metrology instrument that enables it to have a dc to 20-MHz bandwidth and nanometer resolution are also detailed.The applicability of using laminated one-dimensional piezoelectric plates as testbeds to study some of the fundamental characteristics of piezoelectric actuators and sensors is also examined.Taking advantages of the linear and angular displacement/velocity measurement modes of the vibrometer/interferometer, the performance of distributed piezoelectric sensors, which can measure bending angle and bending displacement at any point of the testbed, is characterized.In addition, the corresponding piezoelectric actuator that can exert bending moment on the testbed is also evaluated.The hysteresis effect and feedback vibration control potential of both piezoelectric polymer polyvinylidene uoride (PVF 2 ) and piezoelectric ceramic lead, zirconate, and titarate (PZT) are investigated by using a bimorph con guration testbed.Experimental results show that PVF 2 acts more linearly than PZT during sensing.Furthermore, the in uence of the driving sources on the piezoelectric actuators can be veri ed experimentally.It can be shown that driving PZT by using a current source will have a less severe hysteresis effect than driving it with a traditional voltage source.
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