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TiO2 Film Coated Tilt Fiber Grating Refractive Index Sensor and Detection System

A technology of tilting fiber gratings and refractive index sensors, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of not fully utilizing the high-sensitivity characteristics of high-order cladding modes, and achieve the effect of improving perception ability

Active Publication Date: 2020-11-03
WENZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current research on tilted LPFG sensors mainly focuses on the conventional sensor design and the single-peak resonance of the cladding mode, and does not make full use of the high-sensitivity characteristics of the high-order cladding mode

Method used

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  • TiO2 Film Coated Tilt Fiber Grating Refractive Index Sensor and Detection System
  • TiO2 Film Coated Tilt Fiber Grating Refractive Index Sensor and Detection System
  • TiO2 Film Coated Tilt Fiber Grating Refractive Index Sensor and Detection System

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Embodiment Construction

[0037] Specific embodiments of the present invention such as figure 1 As shown, this embodiment discloses a refractive index detection system, which includes a near-infrared broadband light source (1), a polarization controller (2), a reaction cell for a sample to be tested (3), and a titanium dioxide film-coated tilted fiber grating refractive index sensor ( 4), spectrum analyzer (5) and optical fiber jumper (6); figure 2 As shown, the TiO2 film-coated tilted fiber Bragg grating refractive index sensor (4) is composed of a nanoscale TiO2 film (8) coated on the surface of the grating area, and a long-period fiber grating Ex-TLPFG (7) with an inclination angle of 87° , the above-mentioned spectrum analyzer is a commercial spectrometer covering the near-infrared band; the above-mentioned optical fiber jumper is a commercial single-mode optical fiber jumper. like figure 2 shown, where r co and r cl are the core and cladding radii, respectively, n co and n cl Respectively ...

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Abstract

The invention discloses a titanium dioxide film coating inclined fiber grating refractive index sensor and a detection system. Inclined fiber grating is coated with a titanium dioxide film to serve asa sensor, polarized light is input to enter a great inclined angle grating area of the sensor and then is coupled to an s polarization state TE0, a j coating film or a p polarization state EH2; the jcoating film, not the traditional HE / EH1, can work in the s polarization state TE0 and j or p polarization state EH2 by further regulating and controlling the polarization coupling characteristic anda resonance parameter of the sensor; the j coating film is in a double-peak resonance state, TE0, j and EH2; the j coating film has specific HE / EH1; the j coating film has sensitive environment response characteristic, so the interaction degree of the sensor and a to-be-detected substance is enhanced and more excellent sensing characteristic is achieved; further, the scheme effectively utilizes afiber mode resource and is favorable for developing optical fiber sensors with multiple parameters, more excellent spectrums and sensing characteristic.

Description

technical field [0001] The invention relates to the technical field of optical fiber grating refractive index sensors, in particular to a titanium dioxide film-coated tilted optical fiber grating refractive index sensor and a detection system. Background technique [0002] Fiber Bragg grating is an important wavelength modulation passive photonic device, which has been widely used in the field of sensing and detection in recent years. Ordinary fiber gratings mainly include fiber Bragg grating (FBG) and long period fiber grating (LPFG). FBG is composed of a grating with a period of tens to hundreds of nanometers, which can realize the mode coupling between the core guided mode and the reverse transmission core guided mode at the resonant wavelength that meets the phase matching condition, so that in its reflection spectrum produce resonance peaks. Sensing detection can be realized by monitoring the change of the resonant peak with the environment to be measured. However, i...

Claims

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Application Information

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IPC IPC(8): G01N21/41
CPCG01N21/4133
Inventor 李志红罗倩倩严博腾阮秀凯张耀举戴瑜兴蔡振闹
Owner WENZHOU UNIVERSITY
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