微型探头测量脉冲超声场参量的初步研究

Initial study of measured pulse ultrasound field using miniature hydrophone

报道用笔型水听器测量CTS—2A型超声诊断仪的1.25,2.5MHz探头的声场参量结果。1.25MHz探头在轴向距离13cm处声压P_+=0.15789MPa,P_-=0.11658MPa,I_(SPTP)=1.66W/cm^2;2.5MHz探头在轴向距离15cm处P_+=0.055MPa,P_-=0.05955MPa,I_(SPTP)=0.183W/cm^2。声脉冲宽度约在3～5μs。在这样的条件下,液体介质存在引发声空化潜在的危险。

The ultrasound field parameters of the probe of the diagnostc utrasound equipment have been measured by miniature hydrophone. The sound pressure of probe 1.25 MHz and 2.5MHz are P_=0.158MPa, P_=0.117MPa and P_+=0.055MPa P_=0.05955MPa, respectively. Their intensities are I_(sptp)=1.66W/cm^2 and I_(sptp)=0.183W/cm^2, respectively in the axial distance 13cm and 15cm from the probe. The acoustic pulse duration is between 3μs and 5μs. In the case, there is a petential hazard of acoustic cavitation in liquids.