LIQUID SURFACE LEVITATION USED AS A MEANS OF ULTRASONIC IMAGE CONVERSION FOR MATERIALS INSPECTION.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1968
- Accession Number
- AD0667934
Entities
People
- Otto R. Gericke
- Robert C. Grubinskas
Organizations
- United States Army Research Laboratory