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Refractive index sensor of micro-nano optical fiber

A refractive index sensor and micro-nano optical fiber technology, applied in the field of sensing, can solve the problems of reducing the mechanical strength of the sensor, limiting the accuracy, increasing the sensitivity, etc., and achieve the effects of high accuracy, fast response speed, and high sensitivity

Inactive Publication Date: 2011-08-03
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

Long-period fiber gratings (LPG) have high sensitivity to changes in the refractive index of the surrounding medium, but the LPG multi-resonant peaks and large bandwidth of transmission peaks limit the accuracy of refractive index measurement. The evanescent optical waveguide is used to measure the refractive index of the medium, which can achieve high sensitivity, but this method reduces the mechanical strength of the sensor while etching increases the sensitivity

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  • Refractive index sensor of micro-nano optical fiber
  • Refractive index sensor of micro-nano optical fiber
  • Refractive index sensor of micro-nano optical fiber

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Embodiment Construction

[0024] The micro-nano optical fiber is drawn by flame heating and one-step stretching. The coating layer is removed and fixed on the electric translation stage. The hydrogen flame is used to heat the bare optical fiber. The bare optical fiber is heated in a molten state. The speed and stroke of the motor get the micro-nano fiber of the desired size.

[0025] A uniform Bragg grating is written on the micro-nano fiber by phase mask method to form the sensing element of the sensor.

[0026] The specific assembly method of the sensor of the present invention is as figure 2 shown. The light of the wide-spectrum light source is input into the micro-nano optical fiber engraved with Bragg gratings after passing through a circulator, and the reflected light of the micro-nano optical fiber is output to the spectrum analyzer through the circulator.

[0027] When the present invention specifically measures the refractive index of the solution to be measured, the sensing unit of the sen...

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Abstract

The invention discloses a refractive index sensor with high sensitivity based on micro-nano optical fiber gratings, wherein a sensing unit is a sub-wavelength diameter micro-nano optical fiber with the diameter less than a transmission wavelength; uniform Bragg gratings are inscribed on the micro-nano optical fiber; and a wide-spectrum light source is connected with the micro-nano optical fiber gratings of the sensing unit through a circulator, and the other end of the circulator is connected with an optical spectrum analyzer. The real-time response on the refraction index change of an ambient medium is realized by utilizing the strong evanescent field characteristics of the micro-nano optical fiber and the wavelength selectivity characteristics of the optical fiber gratings and measuring the central wavelength of the gratings. The refraction index sensor disclosed by the invention has the advantages of high measuring sensitivity, simple structure, small volume and wide application prospect.

Description

technical field [0001] The invention relates to the field of sensing technology, in particular to a high-sensitivity refractive index sensor based on a sub-wavelength diameter micro-nano fiber grating. Background technique [0002] Refractive index sensing is of great significance in the measurement of gas and aqueous solution samples and the monitoring of material solidification in large aircrafts. The measurement of refractive index has a wide range of applications in basic research, chemical analysis, environmental pollution assessment, medical diagnosis and food industry. . Long-period fiber gratings (LPG) have high sensitivity to changes in the refractive index of the surrounding medium, but the LPG multi-resonant peaks and large bandwidth of transmission peaks limit the accuracy of refractive index measurement. The evanescent optical waveguide is used to measure the refractive index of the medium, which can achieve high sensitivity, but this method reduces the mechani...

Claims

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Application Information

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IPC IPC(8): G01N21/41
Inventor 孙琪真刘德明梁瑞冰沃江海李晓磊
Owner HUAZHONG UNIV OF SCI & TECH
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