Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1980-01-21
1982-08-10
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 2704
Patent
active
043440304
ABSTRACT:
The invention relates to non-destructive testing for flaws in the surfaces of, particularly, billets, strip or sheet. There have been many systems developed for the detection of flaws in the surface of a workpiece such as visual techniques employing ferromagnetic materials in a fine suspension including an ultra violet dye, and techniques employing the eddy current effect, both of which suffer in that they are unsatisfactory when a workpiece is moving or when a workpiece is hot. Attempts have been made to employ micro-waves but such attempts have essentially required a very close spacing between the detector-receiver and the surface being scanned again making such equipment unsuitable for use with a moving workpiece or when a workpiece is hot. The invention overcomes these problems by providing equipment comprising a source of plane-polarized micro-wave radiation adapted for direction at a surface to be scanned, and detection means for plane-polarized micro-wave radiation reflected from the surface, the polarization directions of the transmitter and the receiver being perpendicular to each other.
REFERENCES:
patent: 2999982 (1961-09-01), Broussaud
patent: 3144601 (1964-08-01), Slabodsky
patent: 3562642 (1971-02-01), Hochschild
patent: 3710243 (1973-01-01), Keenan
patent: 3936736 (1976-02-01), Ray
patent: 4123703 (1978-10-01), Robinson
Hruby et al., A Novel Nondestructive, Noncontacting Method of Measuring the Depth of Thin Slits & Cracks in Metals, The Review of Scientific Instruments, May 1970.
Feinstein et al., A Noncontacting Device for Detection of Cracks on Metal Surfaces, The Procedures of the 10th Symposium on NDE, Apr. 1975.
Anderson Alan P.
Jackson John C.
Krawczewicz Stanley T.
Lambda Industrial Science Limited
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