Optics: measuring and testing – By light interference – Having light beams of different frequencies
Reexamination Certificate
2007-09-11
2007-09-11
Turner, Samuel A. (Department: 2877)
Optics: measuring and testing
By light interference
Having light beams of different frequencies
C356S497000
Reexamination Certificate
active
11073712
ABSTRACT:
An optical image measuring apparatus capable of effectively obtaining a direct current component of a heterodyne signal which is composed of background light of interference light is provided. The optical image measuring apparatus includes: an optical interference system in which a light beam from a light source is divided into signal light and reference light by a beam splitter, a frequency of the reference light is shifted by a frequency shifter, and the signal light propagating through an object to be measured and the reference light reflected on a mirror are superimposed on each other by the beam splitter to produce interference light; beam splitters for dividing the interference light into interference light beams; shutters serving as an intensity modulating unit for modulating intensities of the respective interference light beams at predetermined intervals; CCDs for receiving the respective interference light beams whose intensities are modulated and outputting electrical signals; and a signal processing portion serving as a calculating unit for calculating an intensity of the direct current component corresponding to the background light of the interference light based on the outputted electrical signals.
REFERENCES:
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patent: 2001-066247 (2001-03-01), None
patent: 3245135 (2001-10-01), None
patent: 2001-330558 (2001-11-01), None
Translation of Akiba(2001-330558) cited by applicant.
Translation of Tanno et al(2001-066247) cited by applicant.
M. Akiba et al.: “Full-field optical coherence tomography by two-dimensional heterodyne detection with a pair of CCD cameras,”Optic Letters, vol. 28, No. 10, May 15, 2003, pp. 816-818.
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Naohiro Tanno: “The imaging technique of the optical coherence tomography and its application to living organism image,”Kogaku(Japanese Journal of Optics), vol. 28, No. 3, 116, (1999), pp. 115-125 (discussed in the specification).
Yoshizawa et al.:New Technology Communications(2003), “Optical Heterodyne Technology,” 7 pages (discussed in the specification).
Akiba Masahiro
Chan Kinpui
Fukuma Yasufumi
Otsuka Hiroyuki
Tsukada Hisashi
Edwards Angell Palmer & & Dodge LLP
Kabushiki Kaisha Topcon
Turner Samuel A.
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