Optics: measuring and testing – By light interference – Having light beams of different frequencies
Reexamination Certificate
2002-07-15
2008-07-01
Connolly, Patrick (Department: 2877)
Optics: measuring and testing
By light interference
Having light beams of different frequencies
Reexamination Certificate
active
07394548
ABSTRACT:
In the method and a device for detecting the phase of a moving object using a heterodyne interferometer, a heterogeneous mode helium-neon laser is used as a direct light source to increase a measuring speed, a measuring resolution, and minimize the loss of the light source. Signals, which have only a frequency difference between reference signals or measured signals and arbitrary signals, are extracted from signals which are obtained by multiplying the arbitrary frequency signals by the reference or measured signals. After frequencies of the reference and measured signals are converted, a phase difference of the extracted signals and displacement of the moving object is measured. The system includes a laser light source, an optical interferometer, a frequency converter, and a phase measurer. The light source uses output light, emitted from the laser generator, which is stabilized in frequency, and has two frequencies which are at right angles to each other and linearly polarized.
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Kim Min-Seok
Kim Seung-Woo
Connolly Patrick
Korea Advanced Institute of Science and Technology
Mayer, Esq. Stuart H.
Meyer & Williams PC
Richey Scott M
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