Ultrasonic holography through metal barriers
Conference
·
OSTI ID:4374436
From 5th international symposium on acoustic holography and imaging; Palo Alto, California, USA (18 Jul 1973). Scanned ultrasonic holography used to retrieve information about objects located behind massive metal barriers is described. The retrieved information is contained in the characteristic interference patterns recorded as the hologram and the visual image is reconstructed from it. Particular problems associated with sound wave transmission through metal slabs, such as multiple reflections and mode conversion, were studied using holograms of point and plane wave sound sources and correlated with analytic techniques. Arising from these studies were procedures for imaging complex target configurations using a focused transducer operating in a pulse-echo mode at normal incidence with an electronically shifted reference beam. Diffusely and specularly reflecting objects were imaged through 1-, 2-, and 4-in. thick flat, and a 2-in. thick curved cylindrical surface aluminum slabs. The limitations of ultrasonic holography through material barriers and the effect of such barriers on the imaging equations were developed analytically and tested against measurements. Possible applications of the technique in the nuclear industry are considered. The potential imaging of irradiated fuel elements in metal covered storage cubicles are explored in detail. (auth)
- Research Organization:
- United Nuclear Industries, Inc., Richland, Wash. (USA); Battelle Pacific Northwest Labs., Richland, Wash. (USA); Washington Univ., Seattle (USA). Dept. of Nuclear Engineering
- DOE Contract Number:
- AT(45-1)-1857
- NSA Number:
- NSA-29-012676
- OSTI ID:
- 4374436
- Report Number(s):
- UNI--71; CONF-730734--1
- Country of Publication:
- United States
- Language:
- English
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