IEC/TS 61949-2007 超声学.原位表征.有限振幅超声波束原位曝光估计

标准号：IEC/TS 61949-2007
中文标准名称：超声学.原位表征.有限振幅超声波束原位曝光估计
英文标准名称：Ultrasonics - Field characterization - In-situ exposure estimation in finite-amplitude ultrasonic beams
标准类型：A42
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：A42
国际标准分类号：11.040.55;17.140.50
适用范围：This Technical Specification establishes:• the general concept of the limits of applicability of acoustic measurements in waterresulting from finite-amplitude acoustic effects;• a method to ensure that measurements are made under quasi-linear conditions in order tominimise finite-amplitude effects, which may be applied under the following conditions:− to acoustic fields in the frequency range 0,5 MHz to 15 MHz;− to acoustic fields generated by plane sources and focusing sources of amplitude gainup to 12;− at all depths for which the maximum acoustic pressure in the plane perpendicular tothe acoustic axis lies on the axis;− to both circular and rectangular source geometries;− to both continuous-wave and pulsed fields;• the definition of an acoustic quantity appropriate for establishing quasi-linear conditions;• a threshold value for the acoustic quantity as an upper limit for quasi-linear conditions;• a method for the estimation of attenuated acoustic quantities under conditions of nonlinearpropagation in water.