首页 | 本学科首页   官方微博 | 高级检索  
     


Torsional ultrasonic transducer computational design optimization
Authors:J. Melchor  G. Rus
Affiliation:Dpt. of Structural Mechanics, University of Granada, Politécnico de Fuentenueva, 18071 Granada, Spain
Abstract:A torsional piezoelectric ultrasonic sensor design is proposed in this paper and computationally tested and optimized to measure shear stiffness properties of soft tissue. These are correlated with a number of pathologies like tumors, hepatic lesions and others. The reason is that, whereas compressibility is predominantly governed by the fluid phase of the tissue, the shear stiffness is dependent on the stroma micro-architecture, which is directly affected by those pathologies. However, diagnostic tools to quantify them are currently not well developed. The first contribution is a new typology of design adapted to quasifluids. A second contribution is the procedure for design optimization, for which an analytical estimate of the Robust Probability Of Detection, called RPOD, is presented for use as optimality criteria. The RPOD is formulated probabilistically to maximize the probability of detecting the least possible pathology while minimizing the effect of noise. The resulting optimal transducer has a resonance frequency of 28 [kHz].
Keywords:Non-destructive evaluation   Torsional ultrasound   Probability of detection   Finite element method   Soft tissue mechanics
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号