摘要
水听器作为测试基本物理量声压的设备,被广泛应用于医疗超声的声场测试中。但是由于水听器具有指向性,水听器与超声换能器的夹角会给声场的测试引入一定的误差。为了保证测试的准确度,有必要对水听器的指向性进行测试与研究。在本试验中,我们针对同一个给定的HIFU换能器分别测试了针式水听器、膜式水听器和鲁棒水听器。实验结果表明水听器指向性具有一定的不对称性,这个是由于制造工业等原因造成的。因此,沿着一个轴的方向测试水听器的指向性是不能满足测试需求的。在描述HIFU声场的时候,有必要校正水听器的指向性。
Hydrophone has been widely used in testing ultrasonic field distribution.But the hydrophone has a certain directivity,which may bring error in the actual acoustic field measurements.So it is necessary to meet some requirements about the directivity of hydrophone.In the measurement,the spatial directivities of needle hydrophone,membrane hydrophone and robust hydrophone is measured and a comparison about measured data of HIFU acoustic field with them is given.Experimental results indicate that the asymmetric special directivity of hydrophone is due to manufacturing processes and other reasons.As a result,it is not sufficient to test the directivity of hydrophone along one axis.It is necessary to adjust the direction of the hydrophone when characterizing the HIFU field.
出处
《中国医疗器械信息》
2014年第12期61-65,共5页
China Medical Device Information
