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Optical excitation inversion evaluation method of ferroelectric ceramics using acoustic emission technique
Optical excitation inversion evaluation method of ferroelectric ceramics using acoustic emission technique
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机译：基于声发射技术的铁电陶瓷光激发反演评估方法
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摘要
The present invention relates to a method for evaluating the photoexcited region reversal of ferroelectric ceramics under light irradiation using an acoustic emission (AE) technique.;The present invention concentrates light having energy above the band gap from the xenon lamp 1 on the ferroelectric ceramic specimen 4 through the waveguide 2 and the lens 3 to form non-excited electrons trapped at the grain boundaries. As the division reversal occurs due to the space charge electric field, acoustic emission is caused by the release of temporary elastic energy, which is detected by the acoustic emission sensor 5, filtered through the band filter 7, and then amplified by the preamplifier 8. After analyzing in the AET 5500 system 10 connected to the computer 9, the acoustic excitation events with the peak height above the threshold voltage were counted for the light irradiation time, and then the occurrence rate of the photoexcitation region reversal activity was calculated. Can be evaluated qualitatively and the amount of change in light pressure current can be determined from a calibration curve between a predetermined sound emission event occurrence rate and the light pressure current change rate. It can be unpredictable.;Also, for the acoustic emission signals detected by the present invention, energy = peak height (dB) + 10 log (duration time (μs) is obtained and the energy is obtained. From the group, the acoustic emission signal due to the 180 ° and 90 ° region inversion of the ferroelectric ceramics having a tetragonal structure can be separated.
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