Common path point diffraction interferometer using liquid crysta

Details Common path point diffraction interferometer using liquid crysta Common path point diffraction interferometer using liquid crysta

1995-06-14

1997-11-18

Gross, Anita Pellman

Liquid crystal cells, elements and systems

Liquid crystal system

349193, 349201, 356354, 356363, G02F 113, G01B 902, G01B 1100

Patent

active

056893140

ABSTRACT:
A common path point diffraction interferometer uses dyed, parallel nematic liquid crystals which surround an optically transparent microsphere. Coherent, collimated and polarized light is focused on the microsphere at a diameter larger than that of the microsphere. A portion of the focused light passes through the microsphere to form a spherical wavefront reference beam and the rest of the light is attenuated by the dyed liquid crystals to form an object beam. The two beams form an interferogram which is imaged by a lens onto an electronic array sensor and into a computer which determines the wavefront of the object beam. The computer phase shifts the interferogram by stepping up an AC voltage applied across the liquid crystals without affecting the reference beam.

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NASA technical Memorandum 106687--Defocus Measurement Using a Liquid Crystal Point Diffraction Interferometer, Mercer et al, Aug. 1994.

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