Pump shaft inspection system

Details Pump shaft inspection system Pump shaft inspection system

1988-11-15

1990-02-13

Behrend, Harvey E.

Measuring and testing

Vibration

By mechanical waves

G01N 2904

Patent

active

048995908

ABSTRACT:
An inspection system for non-destructively detecting physical defects in solid shafts by launching and receiving longitudinal acoustic waves has been described incorporating a transducer head containing a transducer head containing a matrix of transducers, pulsers, pulse width modulators, preamplifiers and a summing amplifier. A fiber optic cable may couple the transducer head to a remote location containing a receiver and a oscilloscope. The invention overcomes the problem of launching longitudinal acoustic waves with insufficent energy. Further, the invention overcomes the problem of asymmetric load conversions affecting the output signal arising at times when only one transducer is used and is positioned off center with respect to the solid shaft.

REFERENCES:
patent: 3636778 (1972-01-01), Huffstetler
patent: 3960006 (1976-06-01), Smith
patent: 4165648 (1979-08-01), Pagano
patent: 4479387 (1984-10-01), Wagner et al.
patent: 4660419 (1987-04-01), Derkaes et al.

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