Polarimeter re-calibration method and apparatus

Details Polarimeter re-calibration method and apparatus Polarimeter re-calibration method and apparatus

1992-10-08

1994-03-22

Rosenberger, Richard A.

Optics: measuring and testing

By polarized light examination

356367, G01J 404

Patent

active

052969134

ABSTRACT:
A method and an apparatus to re-calibrate a polarimeter without a standard source with known polarization. An input electromagnetic wave is sequentially transformed into many electromagnetic waves, all having substantially the same degree of polarization and at least three of the electromagnetic waves having different states of polarization. All the electromagnetic waves are measured by the polarimeter. The method then calculates a calibration factor which, when applied to the measured signals, generates substantially the same calculated degree of polarization for all the electromagnetic waves. A birefringent material, such as a wave-plate, can be used to generate the electromagnetic waves from the input electromagnetic wave. If the input electromagnetic wave is an optical wave, then loops of optical fibers or an electro-optic material, such as a LiNbO.sub.3 crystal, is used as the birefringent material.

REFERENCES:
patent: 5011295 (1991-04-01), Krishnan et al.

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