Ultrasonic testing system

Details Ultrasonic testing system Ultrasonic testing system

1978-10-19

1980-03-18

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

G01N 2904

Patent

active

041933060

ABSTRACT:
An ultrasonic system for detection of defects is provided including a pulse-echo instrument having a cathode ray tube on which an A-scan visual indication of flaws is produced and including a doppler circuit arranged to produce a doppler signal in an audible range in response to movement of a transducer relative to defects in a pipe seam or other region being investigated. The doppler signal is applied to earphones, permitting the existence of defects to be reliably determined audibly, after which the defects may be more carefully studied through the visual indications on the cathode ray tube. The doppler signal is also recorded on one track of a magnetic tape with operator's comments being recorded on a second track of the same tape. The doppler circuit includes an oscillator operated during a gating time interval to generate a reference signal, a phase detector responsive to a reference signal and to echo ignals, and a sample and hold circuit for storing the output of the phase detector from one cycle to the next.

REFERENCES:
patent: 3534590 (1970-10-01), Kent et al.
patent: 4088030 (1978-05-01), Iversen et al.
patent: 4111053 (1978-09-01), Geithman et al.

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