Measuring and testing – Vibration – By mechanical waves
Reexamination Certificate
2007-07-10
2007-07-10
Williams, Hezron (Department: 2856)
Measuring and testing
Vibration
By mechanical waves
C073S599000, C073S600000
Reexamination Certificate
active
10539537
ABSTRACT:
The invention relates to a method for determining the size of a fracture (26) in a workpiece (20), in particular the depth of a fracture (26) in said workpiece (20), by means of the ultrasound pulse method, comprising the following method steps: a workpiece (20), with a front surface (22) and a back surface (24), having a fracture (26), extending from the back surface (24) and an angle test head (28) is applied to the front face (22), transmits ultrasound pulses at an angle alpha into the workpiece (20) and receives echoes from said pulse, the angle test head (28) is moved at least once over the fracture (26), such that the radiation beam (46) from the angle test head (28) completely covers the fracture (26), the received echo signals are digitized and stored in a memory (40) as variable pairs of echo signal versus runtime, the variable pairs form a value upwardly defined by an envelope (48) and the dimension of the fracture (26) is determined from the width of the envelope (48) at a given partial amplitude and the maximum amplitude of the envelope (48).
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API Recomended Practice 5UE, First Edition, American Petroleum Institute, Mar. 2002, p. 1-16.
V. Deutsch, et al., Ultraschallprufung (1997) pp. 55-73.
V. Deutsch, et al., Ultraschallprufung (1997) pp. 125-135.
Akerman & Senterfitt
GE Inspection Technologies Systems GmbH
Saint-Surin Jacques M.
Williams Hezron
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