PHOTOACOUSTIC GENERATION OF FOCUSED QUASI-UNIPOLAR PRESSURE PULSES  

作　　者：KONSTANTIN MASLOV HAO F.ZHANG LIHONG V.WANG 

机构地区：[1]Optical Imaging Laboratory,Department of Biomedical Engineering Washington University in St.Louis St.Louis,Missouri 63130,USA [2]Department of Electrical Engineering and Computer Science University of Wisconsin-Milwaukee Milwaukee,Wisconsin 53201,USA

出　　处：《Journal of Innovative Optical Health Sciences》2010年第4期247-253,共7页创新光学健康科学杂志（英文）

基　　金：sponsored in part by National Institutes of Health Grant Nos.R01 EB000712 and R01 NS46214(BRP).

摘　　要：The photoacoustic effect was employed to generate short-duration quasi-unipolar acoustic pressure pulses in both planar and spherically focused geometries.In the focal region,the temporal profile of a pressure pulse can be approximated by the first derivative of the temporal profile near the front transducer surface,with a time-averaged value equal to zero.This approximation agreed with experimental results acquired from photoacoustic transducers with both rigid and free boundaries.For a free boundary,the acoustic pressure in the focal region is equal to the sum of a positive pressure that follows the spatial profile of the optical energy deposition in the medium and a negative pressure that follows the temporal profile of the laser pulse.

关 键 词：PHOTOACOUSTICS optoacoustics ultrasound generation unipolar pulse 

分 类 号：TN2[电子电信—物理电子学]