Method and apparatus for measuring the orientation of optical ax

Details Method and apparatus for measuring the orientation of optical ax Method and apparatus for measuring the orientation of optical ax

1996-10-23

1999-06-29

Kim, Robert

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356345, G01B 902

Patent

active

059175982

ABSTRACT:
This invention provides an optical and computation system that does not utilize moving parts, which enables the angular orientation of the optical axes on the surface of a birefringent material to be determined and comparably, the orientation of the optical axes within light emerging from that surface. Further, since this invention considers the relative orientations of the preferred axis or axes of polarization within light, this method is also applicable for determining the angular orientation of the preferred axis of polarization of elliptically or linearly polarized light or the orientation of the polarizing axis of the material causing the preferred direction of polarization. For birefringent generated axes, this invention allows for the principal axis to be identified distinctly from the quadrature axis and without ambiguity. This is achieved by consideration of the relative intensities of the light emerging from the birefringent or polarizing material when observed through a plurality of linear or elliptical polarizers whose axes are set at known and distinct orientations to the reference direction of the measurement system, and with the ambiguities in the determination of the principal axis in the birefringent system removed by use of the phase of the interference patterns resulting when the light passing along the principal and quadrature axes within the birefringent material is combined by the linear or elliptical polarizers.

REFERENCES:
patent: 4171908 (1979-10-01), Robert et al.
patent: 4563093 (1986-01-01), Tada et al.
patent: 4973163 (1990-11-01), Sakai
patent: 5229834 (1993-07-01), Lequime
patent: 5400131 (1995-03-01), Stocklet et al.

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