Physical quantity measuring apparatus utilizing optical...

Details Physical quantity measuring apparatus utilizing optical... Physical quantity measuring apparatus utilizing optical...

2011-02-15

2011-02-15

Lauchman, L. G (Department: 2877)

Optics: measuring and testing

For optical fiber or waveguide inspection

C356S033000, C356S035500, C356S364000, C356S368000, C385S012000, C385S015000, C385S037000, C385S031000, C250S227140, C250S227170, C250S225000

Reexamination Certificate

active

07889332

ABSTRACT:
A physical quantity measuring apparatus utilizing optical frequency domain reflectometry of the invention includes a tunable laser; a first polarization-maintaining fiber; a polarization-maintaining coupler; a second polarization-maintaining fiber; a third polarization-maintaining fiber; a sensor consists of fiber Bragg gratings formed at a core of the third polarization-maintaining fiber; a fourth polarization-maintaining fiber; a photodiode detects Bragg reflected light from the sensor and reference light from the referential reflecting end; a controller detects a modulation of an interference intensity between the Bragg reflected light and the reference light, based on an intensity change of multiplexed light of the Bragg reflected light and the reference light; an incidence part inputs the measuring light; and an optical path-length adjuster arranged on the third polarization-maintaining fiber; the incidence part provided on the first polarization-maintaining fiber, or on both the second and third polarization-maintaining fibers.

REFERENCES:
patent: 6417507 (2002-07-01), Malvern et al.
patent: 6566648 (2003-05-01), Froggatt
patent: 6795599 (2004-09-01), Spirin et al.
patent: 2010/0134783 (2010-06-01), Omichi et al.
patent: 11-064119 (1999-03-01), None
patent: 3819119 (1999-03-01), None
patent: 2004-205368 (2004-07-01), None
patent: 3740500 (2004-07-01), None
patent: 2005-147900 (2005-06-01), None
patent: 4102291 (2005-06-01), None
patent: 2005-015149 (2005-02-01), None
H. Murayama, et al, “Distributed Strain Measurement with High Spatial Resolution Using Fiber Bragg Gratings and Optical Frequency Domain Reflectometry”, Proceedings OFS-18, ThE40, 2006.
Brooks A. Childers, et al., “Use of 3000 Bragg grating sensors distributed on four eight-meter optical fibers during static load tests of a composite structure”, Proceedings SPIE's 8thInternational Symposium on Smart Structure and Materials, 2001, pp. 133-142, vol. 4332.

Affiliated with

Also associated with

Rating

Physical quantity measuring apparatus utilizing optical... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Physical quantity measuring apparatus utilizing optical..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Physical quantity measuring apparatus utilizing optical... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2643475