Electricity: measuring and testing – Magnetic – With compensation for test variable
Patent
1991-07-19
1993-03-02
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With compensation for test variable
324226, 324238, 324241, 328167, G01N 2782, G01N 2790, G01R 3312
Patent
active
051912856
ABSTRACT:
A system for processing signals produced by magnetic flaw detection apparatus having facility for examining objects in the course of transport thereof at speeds varying from a prescribed slow speed to a prescribed high speed, with transport frequency thus being within a first frequency range. The system comprises first circuitry for detecting the speed of transport of an object under examination and generating output signals indicative of the detected speed and extending over a given characteristic range correspondingly with the first frequency range. Second circuitry is provided for receiving the first circuitry output signals and transforming the same into a second frequency range substantially expanded as compared to the first frequency range. The second circuitry stores a plurality of band pass filter center frequency selections in the second frequency range correlated with the transport speed indications in the first circuitry output signals and is operable for providing control signals indicative of center frequency selections. Variably settable filter circuitry receives the second circuitry control signals and is responsive thereto to establish a band pass filter center frequency, applicable for the current product transport speed, for processing the signals produced by the magnetic flaw detection apparatus.
REFERENCES:
patent: 2881386 (1959-04-01), Price et al.
patent: 3714558 (1973-01-01), Swanepoel
patent: 3835374 (1974-09-01), Frost
patent: 4330748 (1982-05-01), Holden
patent: 4380734 (1983-04-01), Allerton
Bebick Paul J.
Ghostine Said
Magnetic Analysis Corporation
Strecker Gerard R.
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