Quadrature phase shift interferometer (QPSI) decoder and...

Details Quadrature phase shift interferometer (QPSI) decoder and... Quadrature phase shift interferometer (QPSI) decoder and...

2006-08-15

2006-08-15

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

By light interference

C356S495000

Reexamination Certificate

active

07092100

ABSTRACT:
An arrangement and method for reliably finding the wave form extrema of interference signals produced by a quadrature phase shift interferometer (QPSI) takes advantage of the quadrature property of I and Q signals. The zero-crossing points in the I and Q signals are determined. Peak detection is performed for peaks and valleys in the Q signal in close proximity to the zero-crossing points in the I signal, and for peaks and valleys in the I signal in close proximity to the zero-crossing points in the Q signal. These represent the maximum and minimum points of the I and Q signals. From these points, intensity envelopes are created and QPSI phase wrapping is performed to determine the phase angle and ultimately, out-of-plane displacement may be determined.

REFERENCES:
patent: 4019818 (1977-04-01), Vilkomerson
patent: 5710631 (1998-01-01), Bou-Ghannam et al.
patent: 5883714 (1999-03-01), Jann et al.
patent: 6714357 (2004-03-01), Yamazaki
patent: 2004/0196468 (2004-10-01), Wang et al.

Affiliated with

Also associated with

Rating

Quadrature phase shift interferometer (QPSI) decoder and... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Quadrature phase shift interferometer (QPSI) decoder and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quadrature phase shift interferometer (QPSI) decoder and... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3650354