Title :
Ultrasonic evaluation of high voltage circuit boards
Author :
Klima, Stanley J. ; Riley, Thomas J.
Author_Institution :
NASA-Lewis Res. Center, Cleveland, OH, USA
Abstract :
Preliminary observations indicate that an ultrasonic scanning technique may be useful as a quick, low cost, nondestructive method for judging the quality of circuit board materials for high voltage applications. Corona inception voltage tests were conducted on fiberglass-epoxy and fiberglass-polyimide high pressure laminates from 20° to 140° C. The same materials were scanned ultrasonically by utilizing the single transducer, through transmission technique with reflector plate, and recording variations in ultrasonic energy transmitted through the board thickness. A direct relationship was observed between ultrasonic transmission level and corona inception voltage. The ultrasonic technique was subsequently used to aid selection of high quality circuit boards for the Communications Technology Satellite.
Keywords :
corona; laminates; ultrasonic applications; communications technology satellite; corona inception voltage tests; fiberglass-epoxy; fiberglass-polyimide; high pressure laminates; high voltage circuit boards; reflector plate; transmission technique; ultrasonic energy; ultrasonic evaluation; ultrasonic scanning technique; ultrasonic transmission level; Acoustics; Corona; Materials; Optical fiber communication; Printed circuits; Transducers; Ultrasonic variables measurement;
Conference_Titel :
Power Electronics Specialists Conference, 1976 IEEE
Conference_Location :
Cleveland, OH
DOI :
10.1109/PESC.1976.7072907