KR-20260065002-A - ULTRAVIOLET SENSOR USING LOW-DIAMETER OPTICAL FIBER
Abstract
The present invention relates to an ultraviolet sensor using a low-diameter optical fiber. Specifically, the present invention relates to an ultraviolet sensor using an azobenzene-coated optical fiber Bragg grating (FBG), and more specifically, to an ultraviolet sensor using a low-diameter optical fiber in which ultraviolet sensitivity is increased by reducing the diameter of the optical fiber.
Inventors
- 안태정
- 강한맘
Assignees
- 조선대학교산학협력단
Dates
- Publication Date
- 20260508
- Application Date
- 20241030
Claims (7)
- Optical fiber with a Bragg grating formed thereon; Azobenzene polymer coated on the optical fiber above; including UV sensor utilizing low-diameter optical fiber.
- In Article 1, The above optical fiber is fusion spliced between adjacent optical fibers. Characterized by, UV sensor utilizing low-diameter optical fiber. .
- In Article 1, Characterized that the diameter of the optical fiber has a value smaller than the diameter of an adjacent optical fiber. UV sensor utilizing low-diameter optical fiber.
- In Article 1, The diameter of the optical fiber is 80 to 120 μm, UV sensor utilizing low-diameter optical fiber.
- In Article 1, The above azobenzene polymer is a polymer composed of a vinyl ether-type azobenzene monomer, TMPTA (trimethylol propanetrimethacrylate), HEA (hydroxyethyl acrylate), and a photoinitiator, UV sensor utilizing low-diameter optical fiber.
- A UV sensor utilizing a low-diameter optical fiber comprising an optical fiber having an optical fiber Bragg grating formed thereon, and an azobenzene polymer coated on the optical fiber; A broadband light source (BLS) capable of emitting light incident on the above-mentioned ultraviolet sensor; An optical spectrum analyzer (OSA) that analyzes light reflected from the above-mentioned ultraviolet sensor; and A coupler that divides one or more input lights into one or more output lights; comprising, UV intensity measurement system.
- In Paragraph 6, The above optical fiber is fusion spliced between adjacent optical fibers. Characterized by, UV intensity measurement system.
Description
Ultraviolet sensor using low-diameter optical fiber Ultraviolet sensor using low-diameter optical fiber The present invention relates to an ultraviolet sensor using a low-diameter optical fiber. Specifically, the present invention relates to an ultraviolet sensor using an azobenzene-coated optical fiber Bragg grating (FBG), and more specifically, to an ultraviolet sensor using a low-diameter optical fiber in which ultraviolet sensitivity is increased by reducing the diameter of the optical fiber. Recently, the demand for sensitive ultraviolet (UV) sensors has increased significantly due to important applications in various fields, including environmental monitoring, industrial processes, and biomedical diagnostics. Fiber Bragg Grating (FBG) is emerging as a promising candidate for UV sensing applications by offering unique advantages such as compact size, immunity to electromagnetic interference, multi-pointing detection, and high sensitivity. Research is underway to miniaturize the diameter of FBGs. The conventional method for manufacturing FBGs was to reduce the diameter of standard glass fibers by etching them with a hazardous hydrofluoric acid (HF) solution. However, the use of HF poses safety issues and requires careful handling due to its corrosive properties, and the etching conditions are sensitive to temperature and HF concentration, which reduces reproducibility. In addition, after etching, the surface may become rough and easily damaged, leading to a decrease in durability. Figure 1 shows a conceptual diagram of an ultraviolet sensor utilizing a low-diameter optical fiber according to one embodiment of the present invention. FIG. 2 illustrates a plan for downsizing the diameter of an optical fiber Bragg grating according to one embodiment of the present invention. Figure 3 shows microscopic images of the diameter of an optical fiber Bragg grating before (a), during (b), and after (c) fusion splicing according to one embodiment of the present invention. FIG. 4 illustrates a series of processes for coating azobenzene onto an optical fiber Bragg grating (FBG) according to one embodiment of the present invention. Figure 5 shows a graph of the peak wavelength according to UV exposure of an azobenzene-coated FBG (diameter: 900 μm) according to one embodiment of the present invention. Figure 6 shows a graph of the peak wavelength according to UV exposure of an azobenzene-coated FBG (diameter: 250 μm) according to one embodiment of the present invention. Figure 7 shows a UV-induced wavelength shift graph of an azobenzene-coated FBG (diameter: 900 μm) according to one embodiment of the present invention. Figure 8 shows a UV-induced wavelength shift graph of an azobenzene-coated FBG (diameter: 250 μm) according to one embodiment of the present invention. The terms and words used in the specification and claims described below should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define terms to best describe his invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application. Throughout the specification, when a part is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Furthermore, when a part is described as "connected" to another part, this includes not only cases where they are "directly connected" but also cases where they are "electrically connected" with other elements interposed between them. The terms used herein are for describing specific embodiments and are not intended to limit the invention. Terms used in the specification in the singular form may include plural forms unless the context clearly indicates otherwise. Additionally, the terms “comprise” and/or “comprising” used herein specify the presence of the mentioned features, steps, numbers, actions, parts, elements, and/or groups thereof, and do not exclude the presence or addition of one or more other features, steps, numbers, actions, parts, elements, and/or groups thereof. Furthermore, all technical terms used in this invention, unless otherwise defined, have the following definitions and correspond to the meaning generally understood by those skilled in the art in the relevant field of this invention. While preferred methods or samples are described herein, similar or equivalents are also included within the scope of this invention. The contents of all publications cited as referenc