ASTM E 1901 - 97. Standard Guide for Detection and Evaluation of Discontinuities by Contact Pulse-Echo Straight-Beam Ultrasonic Methods

American Society for Testing and Materials (ASTM). 1997, 7 pages.
This guide covers procedures for the contact ultrasonic examination of bulk materials or parts by transmitting pulsed
ultrasonic waves into the material and observing the indications of reflected waves. This guide covers only examinations
in which one search unit is used as both transmitter and receiver (pulse-echo). This guide includes general requirements
and procedures that may be used for detecting discontinuities, locating depth and distance from a point of reference
and for making a relative or approximate evaluation of the size of discontinuities as compared to a reference standard.