Self-calibration system for ultrasonic inspection apparatus

Details Self-calibration system for ultrasonic inspection apparatus Self-calibration system for ultrasonic inspection apparatus

1984-01-16

1986-02-04

Bashore, S. Leon

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

73598, 73622, 367 13, G01N 2900

Patent

active

045677476

ABSTRACT:
A tubular workpiece (10) undergoes axial and rotational movement relative to a collar (12) filled with an acoustically coupling medium (14). Longitudinal waves are emitted into the coupling medium and the workpiece from a first transducer (22) and acoustic echoes are received thereby. From the coupling medium travel times between the transducer and the surface of the workpiece, a contour reconstruction apparatus (58) reconstructs the peripheral contour of the workpiece. The workpiece travel times are stored in a memory (92) until the longitudinal velocity of the acoustic wave in the workpiece is determined. Transducers (24, 26) emit and detect a Rayleigh wave which travels around the workpiece circumference. A divider (80) divides the workpiece circumference as determined by the contour reconstruction apparatus by the Rayleigh wave travel time to determine the Rayleigh wave acoustic velocity. A multiplier (82) multiplies the Rayleigh wave velocity by a preselected Rayleigh wave to longitudinal wave ratio to determine the velocity of the longitudinal wave in the workpiece. A second multiplier (100) multiplies the stored longitudinal wave travel times by the longitudinal wave velocity to determine the thickness of the workpiece and the depth of any acoustically reflective flaws.

REFERENCES:
patent: 3512400 (1970-05-01), Lynnworth
patent: 4121467 (1978-10-01), Gerhart
patent: 4398421 (1983-08-01), White
patent: 4434660 (1984-03-01), Michaels et al.

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