Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1998-03-31
2000-11-21
Font, Frank G.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356346, 356345, G01B 902
Patent
active
061511145
ABSTRACT:
An interferometer, preferably a wedge etalon, produces a spatial pattern of fringes when incident radiant energy is coherent. A system for analyzing these fringes uses a transform operation to detect spatial regularity. The transform operation may be electronic (computational) based on the output of individual photodetectors of an array disposed adjacent to the interferometer, or optical by a Fourier transform lens disposed adjacent to the interferometer. In either case, the combination of fringe creating element and transform operation permits the unambiguous detection of light with a coherence length longer than that of natural light, such as from a laser.
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Font Frank G.
Lee Andrew H.
The Boeing Company
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