Quantitative display system of two-dimensional snapshots in the propagation of high-frequency ultrasonic pulses

摘要

The object of the quantitative display system of the propagation of ultrasonic pulses of up to 10 megahertz by means of two-dimensional snapshots corresponding to different planes and phases of the progression of the wave fronts. It is based on realising a single sampling of the ultrasonic signal at each point of the plane considered, by means of the adjustment of the temporal window of a peak detector to a width less than the period of the signals, replacing the high temporal resolution necessary in the sampling by a displacement of the measuring probe with high spatial resolution by means of the numerical control equipment itself used for the two- dimensional scanning. The system provides graphics by means of a conventional analogue recorder or a printer controlled by a digital acquisition system; alternatively it generates the spatial envelope of the pulse and delay maps relating to phase shifts in the vibration of the radiant surface. The most immediate applications are in the area of control of radiation conditions of medical ultrasonic diagnostic and treatment equipment and in inspection applications for the industrial, aeronautical scientific and nuclear plant fields. IMAGE