The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 08, 2001
Filed:
Jun. 25, 1999
Korea Advanced Institute of Science and Technology, Taejeon, KR;
Abstract
Disclosed is a method for testing the photoinduced domain switching of ferroelectric ceramics using AE. A ferroelectric ceramic specimen,was tested for the AE signal and photovoltaic current upon application of light. Light emanating from a xenon lamp,is focused into a specimen,through a waveguide,and a lens,. Raw AE signals are detected through an AE sensor,. The output signals from the AE sensor,are forwarded to a bandpass filter,which filtered the signals. Then, the AE signals are amplified by 40 dB by a pre-amplifier,and further by 30 dB by an AET 5500 system,which is connected to a computer,for analyzing the signals. The AE events which show a peak amplitude greater than or as great as a predetermined threshold voltage are counted with respect to an irradiation period of time, followed by calculating an occurrence rate of the AE event counts. From these data, the activity of the photoinduced domain switching can be qualitatively evaluated. The energy of the AE signals is calculated from the formula: AE Energy(dB)=Peak Amplitude(dB)+10 log Duration Time(&mgr;s), so as to recognize the distributions of the energy. By investigating the types of domain switching which exist in the energy distributions, to which types of domain switching the AE signals are attributed can be determined.