Automatic self-checking of test equipment

Details Automatic self-checking of test equipment Automatic self-checking of test equipment

1978-11-27

1980-12-23

Kreitman, Stephen A.

Measuring and testing

Instrument proving or calibrating

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

G01N 2900

Patent

active

042402816

ABSTRACT:
Equipment for ultrasonic testing structural materials includes transducers and test electronics normally operated in sequential test cycles each cycle including the generation of a test pulse to be sent into the test object and subsequently, upon interaction with the test object, return signals (echos) are received and processed, e.g. as to transit time, amplitude, contour, etc. Self-checking is carried out in three phases. One phase uses simulated receiver signals for operatively disconnected transducers, to be processed by the electronics as if they were echos; a second phase uses simulated transducer inputs and analogous processing and a third phase uses a reference body as test body simulation for conduction of "tests". The results of signal processing are compared with reference signals and correlation of deviations and absence of deviations is used to isolate malfunctions.

REFERENCES:
patent: 3791199 (1974-02-01), Toth et al.
patent: 3975939 (1976-08-01), McLean
patent: 4106326 (1978-08-01), Lather et al.
patent: 4130018 (1978-12-01), Adams et al.
patent: 4131027 (1978-12-01), Terschuren et al.
patent: 4162636 (1979-07-01), Lather et al.

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