We systematically measured the photo-elastic parameter f s of PbWO4 (PWO) for crystals of different thicknesses. We observed a linear behaviour of f s as a function of the thickness for low level applied stresses. This result was corroborated by numerical simulations. f s allows the evaluation of the residual internal stress, useful for crystal quality control. In this work, we also propose a new polariscope based on laser light, which allows a fast measurement and mapping of the internal stress of crystals with high resolution owing to the reduced laser-beam dimension.
PWO photo-elastic parameter calibration by laser-based polariscope / Ciriaco, A; Davi', Fabrizio; Lebeau, M; Majni, Giuseppe; Paone, Nicola; Pietroni, P; Rinaldi, Daniele. - In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT. - ISSN 0168-9002. - STAMPA. - 570:(2007), pp. 55-60. [10.1016/j.nima.2006.09.095]
PWO photo-elastic parameter calibration by laser-based polariscope
DAVI', Fabrizio;MAJNI, GIUSEPPE;PAONE, Nicola;RINALDI, DANIELE
2007-01-01
Abstract
We systematically measured the photo-elastic parameter f s of PbWO4 (PWO) for crystals of different thicknesses. We observed a linear behaviour of f s as a function of the thickness for low level applied stresses. This result was corroborated by numerical simulations. f s allows the evaluation of the residual internal stress, useful for crystal quality control. In this work, we also propose a new polariscope based on laser light, which allows a fast measurement and mapping of the internal stress of crystals with high resolution owing to the reduced laser-beam dimension.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
