Phase shift optical loop spectroscopy

Details Phase shift optical loop spectroscopy Phase shift optical loop spectroscopy

2011-03-15

2011-03-15

Le, Uyen-Chau N (Department: 2874)

Optical waveguides

Optical waveguide sensor

Reexamination Certificate

active

07907799

ABSTRACT:
The invention provides a method and apparatus for measuring one or more optical properties, such as absorbance and refractive index, of a test medium such as a gas, a liquid, or solid material. The method comprises providing a passive optical waveguide loop comprising the test medium, launching in the optical loop an intensity-modulated light at a reference phase, detecting a phase of said light along the optical waveguide loop, and comparing the detected phase of said light along the loop with the reference phase, wherein the comparison provides information about one or more optical properties of the test medium.

REFERENCES:
patent: 6842548 (2005-01-01), Loock et al.
patent: 2004/0118997 (2004-06-01), Lehmann et al.
Engeln, R., et al, “Phase shift cavity ring down absorption spectroscopy.”Chem. Phys. Lett. 262: 105-109 (1996).
Stewart, G., et al., “An investigation of an optical fibre amplifier loop for intra-cavity and ring-down cavity loss measurements.”Meas. Sci. Technol. 12: 843-849 (2001).
Wang, C., et al., “Fiber loop ringdown for physical sensor development: pressure sensor.”Applied Optics43: 6458-6464 (2004).
Wang, C., “Fiber ringdown temperature sensors.”Optical Engineering44 (2005).

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