The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 28, 1989
Filed:
Jun. 22, 1987
Richard M Josephs, Willow Grove, PA (US);
Other;
Abstract
A magneto-optic Kerr effect hysteresis loop measuring apparatus is provided which employs a small relatively low weight ring magnet having a small gap and a high magnetic field strength in the deep gap and in the adjacent external gap. The spot on the product which is to be non-destructively tested is placed in the external gap field next to the small gap in a region of saturating magentic field. A laser beam having a high polarization ratio is directed along an incident path to the spot on the surface of the product to be non-destructively tested and the reflected beam is processed in a Kerr effect detector to provide hysteresis loop data which is capable of providing information sufficient to determine the squareness of the hysteresis loop and the coercivity of the material being non-destructively tested.