Sagnac fourier transform spectrometer having improved...

Details Sagnac fourier transform spectrometer having improved... Sagnac fourier transform spectrometer having improved...

2005-06-03

2008-10-07

Connolly, Patrick J (Department: 2877)

Optics: measuring and testing

By light interference

Spectroscopy

Reexamination Certificate

active

07433044

ABSTRACT:
A Fourier transform spectrometer based on a modified Sagnac interferometer is described. The instrument uses one or more gratings as dispersive elements to greatly improve the spectral resolution, and in-line optics to match the beam size in the interferometer to optimize the efficiency. The resolution can approach about 0.6 GHz at about 632.8 nm (λ/Δλ=8.4×105). A CCD or photodiode array is used as the detector and the fast Fourier transform of the fringe pattern is performed by a computer. Some embodiments employ no mechanically moving parts; therefore, they are compact and easy to align. Practical applications include remote sensing, process monitoring, and basic research. The fast response time of the detector also allows real time spectral analysis.

REFERENCES:
patent: 3765769 (1973-10-01), Treacy
patent: 5059027 (1991-10-01), Roesler et al.
patent: 5684582 (1997-11-01), Eastman et al.
patent: 5761225 (1998-06-01), Fidric et al.
patent: 5777736 (1998-07-01), Horton
patent: 6108082 (2000-08-01), Pettipiece et al.
patent: 6687007 (2004-02-01), Meigs
patent: 7167249 (2007-01-01), Otten, III
patent: 2006/0290938 (2006-12-01), Heintzann et al.
A.E. Siegman, “Lasers,” University Science Books, Mill Valley, CA 1986, FIG. 23.10, p. 905.
Harlander, John M. et al., “Spatial Heterodyne Spectroscopy for High Spectral Resolution Space-Based Remote Sensing,” Optics and Photonics News, Jan. 2004, pp. 46-51.
Office Action (U.S. Appl. No. 11/431936,)- Apr. 28, 2008.

Affiliated with

Also associated with

Rating

Sagnac fourier transform spectrometer having improved... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Sagnac fourier transform spectrometer having improved..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sagnac fourier transform spectrometer having improved... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4017417