US 5665893Reference block for determining operating characteristics of ultrasonic transducer in right circular cylinder type probeGENERAL ELECTRIC COMPANY inventor(s): SMITH Thurman Dale; filed 19960606, Serial No. 660613, issued 19970909
14. A device for calibrating an ultrasonic transducer of a right circular cylinder type probe, comprising a block of material having a planar front face, a planar rear face parallel to said front face, a planar base perpendicular to said front and rear faces, a concave circular cylindrical section which has a radius of curvature slightly greater than a radius of the probe, said concave circular cylindrical section having a centerline axis which is parallel to said base and to said front face and having a focal point along said centerline axis, and a first slot of constant depth extending substantially perpendicular to said planar base, said first slot forming a first planar ultrasonic wave reflecting surface which extends parallel to said planar base to a first depth from said planar base, said first ultrasonic wave reflecting surface being disposed to reflect ultrasound waves transmitted from said focal point back to said focal point.
Abstract: A reference block for determining the characteristics of individual ultrasonic transducers contained within right circular cylinder type ultrasonic probes. Right circular cylinder type ultrasonic probes are designed for performing ultrasonic inspections of components that can only be examined from within a center line access hole. The reference block is made from the same material as that of the right circular cylinder type components which will be examined using the ultrasonic probe being characterized and is designed with curved contact surfaces that specifically duplicate the surfaces of those components. This reference block can be used to calibrate instruments prior to contact inspection using angle-beam search units. The reference block is also useful for checking the performance of both angle-beam and straight-beam search units and for evaluating instrument performance.
U.S. Class: (73/1.82)
IPC: (G01N 29/00)
US Patents Cited: 4309904 4331021 4475376 4964295
OG Section: Electrical
© Copyright 1. Oct 1997 Rolf Diederichs, info@ndt.net