| 摘要 |
This invention relates to a system which characterizes a inhomogeneous medium such as living body tissue by transmitting the ultrasonic wave including plurality of different frequencies to a measuring medium and analyzing the reflected wave from said medium. Generally the ultrasonic waves including different frequencies have respectively different frequency dependent acoustic field profiles. This invention is characterized in that such frequency characteristic of a measuring system is obtained by previously measuring the reflected waves from the reference reflector placed in the reference medium which is homogeneous or weakly inhomogeneous and has almost ignorable or frequency independent attenuation in order to eliminate adverse influence on the received wave due to said difference, such adverse characteristic is stored in the memory, and thereby the signal received when measuring a medium is compensated by said compensating data stored in the memory.
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