Measuring and testing – Vibration – By mechanical waves
Patent
1987-03-30
1988-11-08
Chapman, John
Measuring and testing
Vibration
By mechanical waves
310327, 310334, 310336, G01N 2900
Patent
active
047827017
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.
REFERENCES:
patent: 3553501 (1971-01-01), Thill
patent: 3580057 (1971-05-01), Seegmiller
patent: 4088907 (1978-05-01), Jones et al.
patent: 4461177 (1984-07-01), Feng
patent: 4701658 (1987-10-01), Ringermacher et al.
M. W. Godfrey, L. A. Mahmood, & D. C. Emmony, "An Improved Design of Point Contact Transducer", NDT International, vol. 19, Apr. 1986, pp. 91-93.
F. R. Breckenridge, "Acoustic Emission Transducer Calibration by Means of the Seismic Surface Pulse", J. Acoustic Emission, vol. 1, 1982, pp. 87-94.
ASTM, "Standard Method for Primary Calibration of Acoustic Emission Sensors", 1986 ASTM Standards, Section 3, vol. 03.03, pp. 949-969.
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