Displacement detection apparatus, displacement measurement...

Details Displacement detection apparatus, displacement measurement... Displacement detection apparatus, displacement measurement...

2011-04-26

2011-04-26

Chowdhury, Tarifur (Department: 2886)

Optics: measuring and testing

By light interference

Having polarization

Reexamination Certificate

active

07933023

ABSTRACT:
A displacement detection apparatus includes a light source for emitting light and an extinction ratio conversion element which raises an extinction ratio of the light to 20 dB or more. A condenser lens condenses the light having the increased extinction ratio and a polarization maintaining type optical fiber transmits the condensed light which is subsequently transferred to a diffraction grating that is attached to an object to be measured. The displacement detection apparatus adjusts a polarization axis of the light having increased extinction ratio.

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patent: 5459570 (1995-10-01), Swanson et al.
patent: 539757 (1993-05-01), None
patent: 2005283358 (2005-10-01), None

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