1CS17.140C41中华人民共和国国家标准GB/T20249-2006/IEC61828:2001声学聚焦超声换能器发射场特性的定义与测量方法Acoustics-Definitions and measurement methods forthe transmitted fields of focusing ultrasonic transducers(IEC 61828:2001,Ultrasonics-Focusing transducers-Definitions and measurement methods for the transmitted fields,IDT)2006-05-08发布2006-11-01实施中华人民共和国国家质量监督检验检疫总局中国国家标准化管理委员会发布
