Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1992-05-20
1993-10-12
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324201, 324226, 324239, 324262, G01R 3312, G01R 3316, G01N 2772
Patent
active
052529207
ABSTRACT:
A magnetic characteristics measuring apparatus attains high sensitivity measurement of magnetic characteristics of a specimen. A magnetic field is applied for a predetermined time to the specimen, which is suspended from a beam at one side of a balance, by a solenoid electromagnet, thereby imparting a magnetic force on the specimen. The free oscillating amplitude of the balance following removal of the magnetic force is detected by a laser micro-range finder. Magnetic characteristics of the specimen are measured based on a relationship between the oscillating amplitude and the intensity of the applied magnetic field. The influence of magnetic noise or of magnetic characteristics of the measuring apparatus itself is eliminated, and a very high sensitivity on the order of less than 10.sup.-12 emu is realized in finding magnetic susceptibility with a simple structure.
REFERENCES:
patent: 3665296 (1972-05-01), Gross et al.
patent: 3879658 (1975-04-01), Hummel
patent: 3904956 (1975-09-01), O'Brien et al.
Date Muneyuki
Yamagishi Akio
Adams Bruce L.
Strecker Gerard R.
Wilks Van C.
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