Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1996-04-08
1998-09-08
Turner, Samuel A.
Optics: measuring and testing
By particle light scattering
With photocell detection
G01B 902
Patent
active
058052828
ABSTRACT:
The invention provides a method for performing interference measurements by observation of interference noise, including the steps of splitting an energy beam from an energy source into two beams directed into two different arms of an interferometer; using variable delay-generating means to introduce a path difference between the two arms; introducing a variable phase difference between the two arms, and recombining the two energy beams into a single beam. There is also provided an apparatus including a beam splitter in which an energy beam from an energy source is split into two arms, a variable delay unit in which a variable delay is imposed on one of the two arms, a constant delay unit imposing a constant delay on the other one of the two arms, and a recombiner in which the two arms are recombined to form a single output beam. A phase randomizer is interposed between the constant delay unit or the variable delay unit and the recombiner, to introduce a variable phase difference between the two arms.
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patent: 5191614 (1993-03-01), LeCong
patent: 5459570 (1995-10-01), Swanson et al.
patent: 5589936 (1996-12-01), Uchikawa et al.
Noise Power Spectra of Optical Two-Beam Interferometers Induced by the Laser Phase Noise, Behzad Moslehi, Journal of Lightwave Technology, Nov. 1986, pp. 1704-1710.
"Monomode Optical Fiber Interferometers", Jackson, Journal of Physics E. Scientific Instruments, Dec. 1985, p. 985.
Averbukh Eliyahu
Kinrot Opher
Prior Yehiam
Turner Samuel A.
Yeda Research and Development Co. Ltd.
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