Optical fiber for chemical sensor
AssigneeGwangju Institute of Science and Technology
InventorsBok Hyeon Kim, Youngjoo Chung, So Eun Kim, Bongkyun Kim, Tae Joong Eom, Myoung Kyu Oh
Life of this patent
Estimating the term…
Abstract
An optical fiber for an optical fiber sensor and a chemical sensor using the same are disclosed. The optical fiber includes a core area, and a suspended cladding area formed around the core area and having at least one cladding hole. The core area has at least one core hole for reducing an effective refractive index of the core area. The optical fiber and the chemical sensor using the same may have improved measurement sensitivity by increasing an evanescent field fraction of existing suspended core fibers.
Claims18
An optical fiber for measuring characteristics of gas or liquid, comprising:
- a core area, wherein the core area has a core hole for reducing an effective refractive index of the core area and for increasing evanescent field fraction, and wherein the core hole extends an entirety of a length of the optical fiber;
- and
- a suspended cladding area formed around the core area and having monolayered cladding holes,
- wherein the gas or liquid is directly introduced into the suspended cladding area,
- wherein light passing through the core area is dispersed to the suspended cladding area,
- wherein the cladding holes are formed continuously along with the longitudinal direction of the optical fiber, and
- wherein the core hole has a smaller diameter than the cladding holes.
A chemical sensor using an optical fiber and used for measuring characteristics of gas or liquid, the optical fiber comprising:
- a core area, wherein the core area has a core hole for reducing an effective refractive index of the core area and for increasing evanescent field fraction, and wherein the core hole extends an entirety of a length of the optical fiber;
- and
- a suspended cladding area formed around the core area and having monolayered cladding holes,
- wherein the gas or liquid is directly introduced into the suspended cladding area,
- wherein light passing through the core area is dispersed to the suspended cladding area,
- wherein the cladding holes are formed continuously along with the longitudinal direction of the optical fiber, and
- wherein the core hole has a smaller diameter than the cladding holes.
Dependencies are inferred from the claim text.