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Method for improving refractive index detecting sensitivity of long period fiber gratings

A technology of long-period gratings and optical fiber gratings, which is applied in the direction of cladding optical fiber, optical waveguide and light guide, and phase-influenced characteristic measurement. Sensitivity, improved sensitivity, and easy operation

Active Publication Date: 2015-02-18
BIOLOGY INST OF SHANDONG ACAD OF SCI
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can quickly increase the thickness of the nano-film and adjust the sensitivity of the long-period grating to the refractive index of the environment, it is difficult to precisely control the thickness of the film and the long-period Grating Sensitivity

Method used

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  • Method for improving refractive index detecting sensitivity of long period fiber gratings

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Experimental program
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Effect test

Embodiment １

[0043] Dissolve tantalum ethoxide in ethanol and stir thoroughly to make 0.5ml 3.85mol / L tantalum ethoxide ethanol solution, cool the temperature to 10°C, then add 20ml ethanol aqueous solution with a mass ratio of 95%, stir well, and then cool to 10°C. Pour the mixed solution into the reaction tank 2 of the long-period grating fixing device 1, control the reaction temperature at 10°C, stop the reaction when the reaction time reaches 30 minutes, and wash it with twice distilled water for 6 times. The sensitivity of the refractive index of ethanol reaches 3100nm / RIU, which is 50 times higher than the sensitivity when no tantalum pentoxide nano film is grown.

Embodiment 2

[0045] Prepare 10ml0.01mol / L sodium fluozirconate aqueous solution and 30ml0.01mol / L boric acid aqueous solution respectively, then add the 0.01mol / L boric acid aqueous solution dropwise to the 0.01mol / L sodium fluozirconate aqueous solution, then Fully stir the mixed solution, pour the prepared mixed solution into the reaction tank 2 of the long-period grating fixing device 1, adjust the temperature of the reaction solution to 60°C, control the reaction time for 70 minutes to stop the reaction, and fully rinse with twice distilled water, At this time, the refractive index sensitivity of the long-period fiber grating 3 to n-butanol reaches 3700nm / RIU, which is 126 times higher than that when the zirconia nano-film is not grown.

Embodiment 3

[0047] Prepare 20ml of 0.01mol / L aqueous solution of zirconium sulfate and 40ml of 0.01mol / L ammonium persulfate aqueous solution respectively, then dissolve the two solutions and stir them well to make them evenly mixed, and pour the mixed solution into the long-period grating fixing device In the reaction tank 2 of 1, adjust the temperature of the reaction solution to 50°C, stop the reaction when the reaction time is 40 minutes, and fully rinse with double-distilled water. At this time, the refractive index sensitivity of the long-period fiber grating 3 to isopropanol reaches 2110nm / RIU, the sensitivity is 43 times higher than that of the ungrown zirconia nanofilm.

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Abstract

The invention discloses a method for improving the refractive index detecting sensitivity of long period fiber gratings. The detecting sensitivity is improved by quickly and controllably preparing zirconium dioxide or tantalum pentoxide nano films in proper thickness on the surfaces of the long period fiber gratings through liquid deposition. The method has the advantages that expensive instruments and equipment are not needed; the operation process is simple and convenient; the time spent on regulating the sensitivity of the long period fiber gratings is saved; the refractive index regulation efficiency of the long period fiber gratings is improved; the cost needed for manufacturing long period fiber grating sensors with high sensitivity is reduced.

Description

technical field [0001] The invention relates to the technical field of long-period fiber grating detection, in particular to a method for improving the detection sensitivity of long-period fiber grating refractive index. Background technique [0002] Refractive index is an important parameter to characterize the optical performance of a substance. By studying the refractive index of a substance, one can understand its optical performance, purity, concentration, etc., so it is important to study, predict and design a sensing device that can sense a specific refractive index. New optical materials and their applications in the field of optics are of great research significance, and they are also of great research value for the realization of their applications in industrial production, environmental monitoring, food testing, clinical testing, drug screening, metallurgy and many other fields. [0003] Long-period fiber gratings are passive optical sensing devices that are sensi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/41G02B6/02
Inventor 李秋顺董文飞史建国常智敏郑晖杨艳杨俊慧
Owner BIOLOGY INST OF SHANDONG ACAD OF SCI
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