Thomas A Proctor

US Patent:

47827017, Nov 8, 1988

Filed:

Mar 30, 1987

Appl. No.:

7/031870

Inventors:

Thomas M. Proctor - Barnesville MD

International Classification:

G01N 2900

US Classification:

73587

Abstract:

A transducer is provided for measuring tangential dynamic displacement of a transient nature at a point location on the surface of a mechanical body. This broadband transducer is particularly useful for detection and measurement of acoustic emission signals. The essential components are a large, extended compound backing (1), a sensing piezoelectric element of low geometric symmetry (2) having the proper static polarization, an electrode system (3) and (4), an attachment process (3a), and a means of leveling the transducer (5). The element is characterized by two parallel plane faces of contact, the area of the rear face of attachment being much larger than the front face. The front face has a width dimension which is small in comparison to the wavelength of the highest frequency of interest.