News Column

Findings from University of Missouri Broadens Understanding of Scientific Instruments

June 4, 2014

By a News Reporter-Staff News Editor at Electronics Newsweekly -- Current study results on Scientific Instruments have been published. According to news reporting originating from Columbia, Missouri, by VerticalNews correspondents, research stated, "The high output voltages from piezoelectric transformers are currently being used to accelerate charged particle beams for x-ray and neutron production. Traditional methods of characterizing piezoelectric transformers (PTs) using electrical probes can decrease the voltage transformation ratio of the device due to the introduction of load impedances on the order of hundreds of kiloohms to hundreds of megaohms."

Our news editors obtained a quote from the research from the University of Missouri, "Consequently, an optical diagnostic was developed that used the photoelastic and electro-optic effects present in piezoelectric materials that are transparent to a given optical wavelength to determine the internal stress and electric field. The combined effects of the piezoelectric, photoelastic, and electro-optic effects result in a time-dependent change the refractive indices of the material and produce an artificially induced, time-dependent birefringence in the piezoelectric material. This induced time-dependent birefringence results in a change in the relative phase difference between the ordinary and extraordinary wave components of a helium-neon laser beam. The change in phase difference between the wave components was measured using a set of linear polarizers. The measured change in phase difference was used to calculate the stress and electric field based on the nonlinear optical properties, the piezoelectric constitutive equations, and the boundary conditions of the PT. Maximum stresses of approximately 10 MPa and electric fields of as high as 6 kV/cm were measured with the optical diagnostic. Measured results were compared to results from both a simple one-dimensional (1D) model of the piezoelectric transformer and a three-dimensional (3D) finite element model. Measured stresses and electric fields along the length of an operating length-extensional PT for two different electrical loads were within at least 50 % of 3D finite element simulated results."

According to the news editors, the research concluded: "Additionally, the 3D finite element results were more accurate than the results from the 1D model for a wider range of electrical load impedances under test."

For more information on this research see: Measurement of the internal stress and electric field in a resonating piezoelectric transformer for high-voltage applications using the electro-optic and photoelastic effects. The Review of Scientific Instruments, 2014;85(2):023101.

The news editors report that additional information may be obtained by contacting J.A. VanGordon, Dept. of Electrical and Computer Engineering, University of Missouri, Columbia, Missouri 65211, United States. Additional authors for this research include S.D. Kovaleski, P. Norgard, B.B. Gall and G.E Dale.

Keywords for this news article include: Columbia, Missouri, Electronics, High Voltage, United States, Electro optics, Scientific Instruments, North and Central America.

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Source: Electronics Newsweekly

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