Improvements in ultrasonic inspection devices

TLDR: In this paper, an ultrasonic test device includes a flexible tire mounted on a non-rotating hub and a block of solid material fixed to the hub providing an acoustic path between a transducer and the inner wall of that part of the tyre surface which contacts the piece under test.

Abstract: 1294404 Ultrasonic testing DEFENCE, SECRETARY OF STATE FOR 19 April 1971 [3 March 1970] 10040/70 Headings H4D and H4J An ultrasonic test device includes a flexible tyre mounted on a non-rotating hub and a block of solid material fixed to the hub provides an acoustic path between a transducer and the inner wall of that part of the tyre surface which contacts the piece under test. Aluminium hub 3 is fixed to support arms 1, 2 and carries in bearings a tyre 4 mounted on rims 5, 6. An aluminium block 9 carried in an oil-tight housing 11 is fixed to the hub and carries a piezo-electric transducer 8 fixed to its upper surface. The transducer is shaped to provide a convergent beam of acoustic waves into the test-piece 7, or to focus reflections therefrom. The tyre 4 is partially filled with silicone oil 14 to provide lubrication.