Method and apparatus for visualizing elastic wave propagation in a solid substance

摘要

A method and an apparatus for visualizing an elastic wave propagation in a solid substance can be applied to a subject substance which is any one of a transparent body and an opaque body, and can detect SV waves (transverse waves) and SH waves (transverse waves) in elastic wave motion modes, and longitudinal waves, surface waves, and creeping waves. The visualization method comprises the steps of: generating elastic waves in a solid substance in response to electric signals; measuring a quantity of stress change in the solid substance in connection with elastic waves propagation in the solid substance; synchronizing a transmission timing of the electric signals with a measurement timing of the stress change; carrying out measurement while scanning a sensor; and imaging wave fronts of the elastic waves propagated in the solid substance by synchronously indicating the stress change as a function of time. The visualization apparatus comprises an elastic wave generator (8) for generating elastic waves in a solid substance (9) in response to an electric signals; an electric signal transmitter (7) for transmitting electric signals to the elastic wave generator (8); a sensor (1) for measuring elastic waves propagated in the solid substance; a sensor scanner (3) for controlling a scanning position of said sensor; a detected-signal recorder (2) for receiving and recording detected-signals from the sensor (1); a synchronizing circuit (10) for sending the detected-signals from the sensor (1) to the recorder (1) in synchronization with timing signals from the sensor scanner (3) and electric signal transmitter (7); and an elastic wave stress distribution display (4) for imaging stress distribution signals of the detected-signals from the detected-signal recorder (2).