Physical quantity measuring apparatus utilizing optical...

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

2011-07-05

2011-07-05

Lauchman, L. G (Department: 2877)

Optics: measuring and testing

For optical fiber or waveguide inspection

C356S033000, C356S035500, C356S364000, C356S031000, C385S012000, C385S015000, C385S037000, C250S227140, C250S227170, C250S225000

Reexamination Certificate

active

07973914

ABSTRACT:
A physical quantity measuring apparatus utilizing optical frequency domain reflectometry 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 a fiber Bragg grating formed in 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 that detects modulation of an interference intensity between the Bragg reflected light and the reference light; and an incidence part that inputs the measuring light, wherein the incidence part being provided on the first polarization maintaining fiber or on both the second polarization maintaining fiber and the third polarization maintaining fiber.

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