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Optical fiber hydrogen sensor based on nanometer coaxial waveguide tube and production method of optical fiber hydrogen sensor

A waveguide and sensor technology, applied in the field of optical fiber hydrogen sensor and its preparation, can solve the problems of reduced optical path stability, difficulty in combining high sensitivity and high stability, and achieve low external interference, low power consumption, and low cost. Effect

Active Publication Date: 2021-08-31
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the existing small hydrogen sensors are difficult to achieve both high sensitivity and high stability
Most of the sensing systems with higher sensitivity require the introduction of bulk optical elements, resulting in a decrease in the stability of the optical path

Method used

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  • Optical fiber hydrogen sensor based on nanometer coaxial waveguide tube and production method of optical fiber hydrogen sensor
  • Optical fiber hydrogen sensor based on nanometer coaxial waveguide tube and production method of optical fiber hydrogen sensor
  • Optical fiber hydrogen sensor based on nanometer coaxial waveguide tube and production method of optical fiber hydrogen sensor

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preparation example Construction

[0028] Based on this, the present invention also provides a method for preparing an optical fiber hydrogen sensor based on a nano-coaxial waveguide, the flow chart of which is as follows image 3 As shown, it specifically includes the following steps:

[0029] (1) configuration volume concentration is the polystyrene microsphere colloid solution of 0.05%, injects the polystyrene microsphere colloid solution to the water surface, forms the orderly polystyrene microsphere thin film, the polystyrene microsphere adopted in the present invention The diameter of the microsphere is 600-700nm;

[0030] (2) Transfer the polystyrene microsphere film formed in step (1) to the end face of the cut flat multimode fiber, and dry it naturally. The core diameter of the multimode fiber used in the present invention is 150-200 μm; The mode fiber provides multiple modes, which can be coupled with the waveguide formed by the fiber end face, and the core size of the multimode fiber is several time...

Embodiment 1

[0037] A preparation method of an optical fiber hydrogen sensor based on a nano-coaxial waveguide, specifically comprising the steps of:

[0038] (1) Configure a polystyrene microsphere colloidal solution with a volume concentration of 0.05%, and inject the polystyrene microsphere colloidal solution onto the water surface to form an ordered polystyrene microsphere film. The polystyrene microspheres used The diameter is 600nm;

[0039] (2) Transfer the polystyrene microsphere film formed in step (1) to the end face of the cut flat multimode fiber, and dry it naturally. The core diameter of the multimode fiber used is 150 μm;

[0040] (3) After natural drying, plasma oxygen is used to etch the polystyrene microspheres on the end face of the multimode fiber, and a periodically dispersed array of polystyrene microspheres is obtained on the end face of the multimode fiber. In the present invention, the plasma The conditions of oxygen etching are: O 2 , The air pressure is 5Pa, so...

Embodiment 2

[0046] A preparation method of an optical fiber hydrogen sensor based on a nano-coaxial waveguide, specifically comprising the steps of:

[0047] (1) Configure a polystyrene microsphere colloidal solution with a volume concentration of 0.05%, and inject the polystyrene microsphere colloidal solution onto the water surface to form an ordered polystyrene microsphere film. The diameter of the polystyrene microspheres is 700nm;

[0048] (2) Transfer the polystyrene microsphere film formed in step (1) to the end face of the cut flat multimode fiber, and dry it naturally. The core diameter of the multimode fiber used is 200 μm;

[0049] (3) After natural drying, plasma oxygen is used to etch the polystyrene microspheres on the end face of the multimode fiber, and a periodically dispersed array of polystyrene microspheres is obtained on the end face of the multimode fiber. In the present invention, the plasma The conditions of oxygen etching are: O 2 , Air pressure 5Pa, the diamete...

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Abstract

The invention discloses an optical fiber hydrogen sensor based on a nanometer coaxial waveguide tube and a production method of the optical fiber hydrogen sensor, and relates to the technical field of gas sensors. The optical fiber hydrogen sensor is composed of an optical fiber, a periodic annular coaxial waveguide tube array structure arranged on the end surface of the optical fiber and a palladium layer wrapping the outer side of the periodic annular coaxial waveguide tube array structure. The change of the hydrogen concentration is judged by detecting the movement of the wavelength position of surface plasmon resonance excited by the microstructure through the spectrograph, the hydrogen is measured by a high-sensitivity optical detection method, and meanwhile, the characteristics of high stability and low external interference are achieved. Compared with an existing hydrogen sensor, the structure and the production method of the sensor are high in sensitivity, high in reliability, low in cost, small in size, low in power consumption, easy to form a sensing network and the like.

Description

technical field [0001] The invention relates to the technical field of gas sensors, in particular to an optical fiber hydrogen sensor based on a nano-coaxial waveguide and a preparation method thereof. Background technique [0002] Hydrogen energy has the characteristics of high combustion calorific value, clean and pollution-free, and is considered to be an ideal energy source to replace fossil fuels; but [0003] The hydrogen molecule is small in size, flammable and explosive, which limits its transportation, storage and application. Therefore, to accurately and quickly measure the hydrogen concentration [0004] Time monitoring is very necessary. Hydrogen is ignited and explosive in the range of 4%-74.2% volume concentration, and pure optical method is relatively safe to detect hydrogen concentration. The traditional optical detection method is bulky. With the development of nanophotonic technology and the progress of micro-processing technology, the optical hydrogen s...

Claims

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Application Information

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IPC IPC(8): G01N21/41
CPCG01N21/41
Inventor 倪海彬刘慧研倪波王婷婷葛益娴李元元常建华
Owner NANJING UNIV OF INFORMATION SCI & TECH
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