Analysis of measurements of speed of the ultrasound based on critical angle and lateral wave

Speed of sound(SOS) is a basic physical parameter which describes the propagation characteristics of acoustics in medium. By measuring SOS in medium, we can know the characteristics and the state of the medium. One of the SOS measurements is based on the principle of critical angle and lateral wave, but it has some disadvantages, such as low accuracy, small scope and surceptibility to interference. A new theory was thus proposed based on a new velocity measurement of quantitative ultrasound of lateral wave and critical angle. The method introduced a new parameter, the compensation time of inclination obtained from different values of receiving time. The proposed method is not subject interference from sorrounding tissues and improves measurement accuracy.