Method and an apparatus for shape measurement, and a...

Details Method and an apparatus for shape measurement, and a... Method and an apparatus for shape measurement, and a...

2005-08-17

2008-10-21

Lyons, Michael A (Department: 2877)

Optics: measuring and testing

By light interference

Having polarization

Reexamination Certificate

active

07440112

ABSTRACT:
A method and an apparatus for shape measurement that is able to observe the deep portion under a skin with high spatial resolution by using a frequency COMB light generator is provided. A frequency COMB light generator for generating multiple frequency COMBs with variable frequency pitch at high operation stability is provided.This apparatus for shape measurement comprises a frequency COMB light generator and an optical interferometer for measuring the distance. The frequency COMB light generator includes a laser light source11, an optical resonator13, a COMB pitch regulator14and an output port OUT. The optical resonator13includes an optical modulator131, a first mirror M11, an optical fiber F13which is drawn out from alight waveguide of the optical modulator. The COMB pitch regulator14is a modulation signal generator for varying the modulation signal. The optical fiber F13is equipped with an apparatus (Faraday rotation mirror) for compensating a change in the polarization condition.

REFERENCES:
patent: 6493091 (2002-12-01), Kourogi et al.
patent: 6897959 (2005-05-01), Haensch et al.
patent: 2002-082045 (2002-03-01), None
patent: 2003-043434 (2003-02-01), None
patent: 2003-043435 (2003-02-01), None

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