Apparatus for the control of self-propelled gamma-flaw detector

Radiant energy – Invisible radiant energy responsive electric signalling – With means to inspect passive solid objects

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250360, G01N 2300

Patent

active

042836280

ABSTRACT:
A self-propelled device movable inside a pipeline for the radiographic detection of flaws in its weld joints comprises a reversible drive motor and a normally deactivated radiation emitter. Logical circuitry aboard the device, including a two-stage memory, enables the selective energization of the drive motor and the activation of the radiation emitter during standstill in response to command pulses of different duration transmitted from an external radiation source through the pipeline wall and intercepted by one of two sensors.

REFERENCES:
patent: 4006359 (1977-02-01), Sullins et al.

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