Accession Number : ADD006724

Title :   Material Scanning Apparatus.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Scott,William R

Report Date : 09 Oct 1979

Pagination or Media Count : 7

Abstract : This invention relates to apparatus and method for producing maps of thickness or elastic constant variations of nominally plane sheet or plate materials. Amplitude variation at a set frequency on a normal resonance peak is recorded to determine resonance peak variation and thus specimen thickness or elastic constant variation. A mechanical scanner moves a transducer across the material submerged in a water tank for performing an ultrasonic C-scan. A transmitter or pulse generator repeatedly pulses the transducer to produce a focused narrow pulse of ultrasound which reverberates within the material. Echoes from the material in response to the pulse are received by the same or another synchronously moving transducer, whose resulting signal then passes through a gate, which removes extraneous signals and selects the number of multiple echoes and thus amplitude range desired, and a variable filter controlled by a function generator which selects the desired frequency, to a pen recorder. (Author)

Descriptors :   *Patents, *Electronic scanners, *Maps, *Mechanical scanning, *Plates, Constants, Functions, Materials, Pulse generators, Transducers, Resonant frequency, Ultrasonic radiation, Variations, Elastic properties, Peak values, Thickness, Filters, Amplitude, Echoes

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE