Multiple-Frequency Ultrasonic Pulse-Echo Display System.

摘要

The object of the Multiple Frequency Ultrasonic Pulse-Echo Display System is to provide an enchanced graphic display of the response of materials under test, to ultrasonic pulse excitation. Echo responses in three frequency bands are displayed in three respective colors. The width and center frequency of each band are individualy adjustable, with an overall frequency span from 1 to 10 MHz. The system also provides the capability for scaling waveforms and for permanent data storage. All of the original objectives of the development programs have been met. Off-the-shelf devices provide the functions of transducer, pulser, amplifier, display, and storage. Specialized hardware has been built to filter and detect the signal waveforms, provide a true stepless gate, and encode all relevant data in a suitable form to be displayed. Custom software was written for a commerical terminal to provide three-color display and storage capabilities for measurement data, and to allow the displayed waveforms to be scaled to any desired level. Moreover, the waveforms can be represented in either linear or logarithmic form. The color-graphics computer terminal which provides storage and display capabilities, is limited somewhat in speed; therefore, a real-time oscilloscope display is included in the system, along with certain custom hardware which facilitates its operation.