| 摘要 |
<p>A method for measuring physical characteristics of an object through the use of an ultrasonic wave, which comprises the steps of transmitting an ultrasonic pulse to the object. receiving a reflected wave from the object, analyzing the spectrum of a parameter representing the strength of the reflected wave and obtaining a center frequency of the spectrum to measure the physical characteristics of the object. The center frequency is used as a function of distance or time to obtain its differential or difference coefficient, or a computation similar to that for an X-ray CT is carried out. thereby to obtain an attenuation slope and so forth as the physical characteristics of the object.</p> |
