Axial displacement measurement of a single-crystal actuator using phase-shift interferometry
Document Type
Article
Publication Date
8-1-2005
Abstract
Due to their superior piezoelectric coefficients, PZN-PT ((1 - x) Pb(Zn1/3Nb2/3)O3 - xPbTiO3) and PMN-PT [(1 - x)Pb(Mg1/3Nb2/3)O3 - xPbTiO3] are viewed as possible substitutes for conventional PZT in advanced piezodevices. This paper presents noncontact displacement measurements in small rectangular PZN-PT and PMN-PT crystal rods. We propose a new phase-shift-interferometry-based technique for static and dynamic axial displacement measurement. The measurement technique makes use of the fact that the sinusoidal intensity data from the same pixels in two interferograms with different phase shifts form an elliptic Lissajous curve. We can accurately estimate phase-shift steps by fitting the elliptic Lissajous curve by least squares. Actuator displacements are then calculated from the estimated phase-shift steps. In this paper, the proposed technique was integrated with a Mirau interferometeric microscope with a machine vision system. This optomechatronic measurement system was used to measure the piezoelectric coefficient d31 of < 001> -poled PZN-PT and PMN-PT single crystals as well as hysteresis. Simulations and experiments demonstrate that the proposed technique is robust against the influence of intensity noise in interferograms. © 2005 IEEE.
Publication Title
IEEE Transactions on Industrial Electronics
Recommended Citation
Moon, K.,
Levy, M.,
Hong, Y.,
&
Park, H.
(2005).
Axial displacement measurement of a single-crystal actuator using phase-shift interferometry.
IEEE Transactions on Industrial Electronics,
52(4), 953-959.
http://doi.org/10.1109/TIE.2005.851680
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/11036