Accession Number : AD0667934

Title :   LIQUID SURFACE LEVITATION USED AS A MEANS OF ULTRASONIC IMAGE CONVERSION FOR MATERIALS INSPECTION.

Descriptive Note : Technical rept.,

Corporate Author : ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MASS

Personal Author(s) : Gericke,Otto R. ; Grubinskas,Robert C.

Report Date : MAR 1968

Pagination or Media Count : 25

Abstract : An ultrasonic image conversion cell utilizing the liquid surface levitation effect has been developed for nondestructive testing. This effect is based upon the principle that the surface of a free liquid will be deformed in accordance with the cross-sectional intensity distribution of an impinging ultrasonic beam. It can be coupled directly to an ultrasonically excited test specimen to obtain characteristic liquid-surface relief patterns depicting internal discontinuities. A significant advantage of the conversion cell is the fact that it does not require the test specimen itself to be immersed in a liquid. Also, because the conversion cell produces a real-time image, pulsed, frequency-modulated, and continuous wave modes of ultrasonic excitation can be used, and thus various types of ultrasonic images can be obtained. (Author)

Descriptors :   (*NONDESTRUCTIVE TESTING, *ULTRASONIC RADIATION), IMAGE CONVERTERS, LIQUIDS, SURFACES, DEFORMATION, IMAGES, DEFECTS(MATERIALS), ALUMINUM, PLASTICS, POWDER METALS

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE