By analyzing the influence of sound speed perturbation and array tilt on ray travel-time,ray travel-time and relative arrival-time errors are formulated in this paper.

The ACM was designed for transmitting and receiving the sound signal at same time,and accurate measuring acoustic travel time between two separated stations,using the M-sequence sound signal and GPS time clock.

In order to locate power cable fault fast and accurately,the acoustic propagation time measurement was developed to detect cable fault.

The affecting factor analysis of propagation time of peak flood in downstream of the Yellow River;

under the condition of identical source sensor location,testing stress wave propagation time-goal sensor location curve,respectively in the hole sample and the intact.

Nondestructive pressure measurement based on surface wave usually requests accurate measurement of propagation time of surface wave in the medium.

Sound speed profile in ocean inverted by using travel time;

The measurement technology of the ultrasonic travel time of the ultrasonic based on phase-matched theory was presented.

In this paper,we not only consider the difference between "up-crossing"and "down-crossing" of the wavefront and the stochastic surface and present the general equations of the probabilities of the travel time of the earlier arrivals,but also extend the resu.