Schafer M E, Lewin P A
Int. Sonic Technol. Inc., Horsham, PA.
IEEE Trans Ultrason Ferroelectr Freq Control. 1988;35(2):102-9. doi: 10.1109/58.4160.
The measurement arrangement, which complies with the requirements of the US Food and Drug Administration, consists of a positioning system with a full range of degrees-of-freedom and a digital oscilloscope, both under complete computer control. The acoustic pressure-time waveform is recorded using membrane-type and needle-type polyvinylidene fluoride (PVDF) hydrophone probes. The overall bandwidth of the system depends on the hydrophone probe used and can range up to 100 MHz. A complete description of the system and the measurement procedures is given, along with a brief discussion of the various factors which affect measurement uncertainty. The largest overall uncertainty of the same associated with acoustic intensity measurements was determined to be no greater than 20% for I(sppa) and 25% for I(spta) (spatial peak pulse average intensity and spatial-peak temporal-average intensity, respectively). Other applications of the system include transducer characterization and research work in ultrasound dosimetry and bioeffects.
该测量装置符合美国食品药品监督管理局的要求，由一个具有全方位自由度的定位系统和一台数字示波器组成，二者均在计算机的完全控制之下。使用膜式和针式聚偏二氟乙烯（PVDF）水听器探头记录声压-时间波形。系统的整体带宽取决于所使用的水听器探头，最高可达100 MHz。文中给出了该系统和测量程序的完整描述，以及对影响测量不确定度的各种因素的简要讨论。与声强测量相关的相同整体最大不确定度确定为：对于I(sppa)不大于20%，对于I(spta)（分别为空间峰值脉冲平均强度和空间峰值时间平均强度）不大于25%。该系统的其他应用包括换能器特性表征以及超声剂量学和生物效应方面的研究工作。
