Method and apparatus for the control of self-propelled...

Details Method and apparatus for the control of self-propelled... Method and apparatus for the control of self-propelled...

G - Physics

01

N

358/5.1

G01N 23/18 (2006.01)

Patent

CA 1080368

ABSTRACT OF THE DISCLOSURE: 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 formally deactivated radiation emitter. Logical circuitry aboard the device, including a two-stage memory, enables the selective energiza- tion 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.

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