Abstract: A system for verified detection of flaws in an object, comprises a synchronizing sensor for generating an output signal once per mutual rotational revolution as between itself and the object, a flaw sensor for generating output signals responsive to detection of flaws in the object and extraneous influences, a switch unit responsive to operator input for providing output signals respectively indicative of a preselected number of flaws for such flaw verification and of a preselected number of object revolutions for such flaw verification, and a processor responsible to the output signals of the sync sensor, the flaw sensor and the switch unit for providing verified flaw output indication.

Abstract: In determining shaft rpm (revolutions per minute), a transducer generates a succession of output signals, corresponding to the successive passages of a shaft indicium through the transducer field of view. Processing circuitry is provided for selecting a sequentially successive pair of transducer output signals and for computing rpm therefrom. Updated rpm is computed from a further pair of sequentially successive transducer output signals, both non-sequentially successive to the earlier selected signal pair.