Optical fiber sensor
OwnerEiichi Sugai, Kiyoaki Watabe +2inventors
InventorsEiichi Sugai, Kiyoaki Watabe, Kazunori Yamaga, Seiichi Fujita
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Abstract
In a detection section using a fiber grating (FBG), both ends of the FBG are protected with resin coating and a coated part is adhered or mechanically clamped to fixed parts. A spring or a lever or both of these are connected to one end of this fixed part. This is used as a detection section to convert a variation of a physical quantity such as displacement, weight, pressure or acceleration applied to between the fixed parts to a variation of a reflected wavelength or a transmitted wavelength from a fiber grating and to output the variation of the reflected wavelength and transmitted wavelength.
Claims17
An optical fiber sensor, comprising:
- an optical fiber;
- a first fiber grating written in said optical fiber;
- and
- a pair of fixtures fixed to said optical fiber on both sides of said first fiber grating, said fixtures being fixed to an object to be measured,
- wherein displacement, weight, pressure or acceleration applied to the object to be measured is output as an amount of wavelength shift of either the reflected light or transmitted light by means of expansion/contraction of said first fiber grating.
An optical fiber sensor, comprising:
- strain detecting means in which an optical fiber in which a fiber grating written is fixed to a pair of fixtures on both sides of said fiber grating, said fixtures being directly or indirectly fixed to an object to be measured;
- and
- wavelength detecting means for detecting displacement, weight, pressure or acceleration applied to said object to be measured as an amount of wavelength shift of either the reflected light or transmitted light by means of expansion/contraction of said fiber grating.
Dependencies are inferred from the claim text.