Methods By using the ultrasound pulsereflection law, the correlation between the process of thrombosis formation and changes in the ultrasonic velocity was studied quantitatively.
方法采用超声脉冲反射法,着重就血栓形成过程中对其声速变化的相关性进行了定量研究。
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Acoustic velocities of tap water and polymer solution were studied using ultrasonic-pulsereflection method in the laboratory. Polymer density and apparent viscosity were measured.
The automatic testing method of cable fault is characterized by that the pulse signal transmitted and received by pulsereflection test circuit can be directly superposed on the output end of d.