Measuring method and measuring arrangement for determining the o

Details Measuring method and measuring arrangement for determining the o Measuring method and measuring arrangement for determining the o

1991-04-01

1992-10-20

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2503581, 356364, G01T 400

Patent

active

051572591

ABSTRACT:
The orientation ratio (R.sub.f) of a magnetic layer is defined as the ratio of the magnetizations in the playing direction and the crosswise direction. Assuming that the magnetic layer has anisotropy with respect to the transmittance of infrared light, owing to the orientation of the magnetic pigments, infrared light from a source (IR) is passed through a polarizer (P). The linearly polarized light strikes the magnetic recording medium (M), which is conveyed over a transparent support (T). The support and polarizer are adjusted with respect to one another so that a detector (D) is exposed to maximum light intensity, which is proportional to the orientation ratio (R.sub.f).

REFERENCES:
patent: 4280918 (1981-07-01), Homola et al.
patent: 4654529 (1987-03-01), Boulan et al.
"Versatile and Sensitive Vibrating-Sample Magnetometer", Foner The Review of Scientific Instruments, vol. 30, No. 7 548-557.

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