A Method for Rapidly Adjusting the Refractive Index Sensitivity of Long Period Fiber Bragg Gratings

A technology of long period grating and fiber grating, which is applied in cladding fiber, optical waveguide light guide, phase influence characteristic measurement, etc. Sensitivity, easy availability of raw materials, and simple operation

Active Publication Date: 2018-08-17
BIOLOGY INST OF SHANDONG ACAD OF SCI
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  • Summary
  • Abstract
  • 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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  • A Method for Rapidly Adjusting the Refractive Index Sensitivity of Long Period Fiber Bragg Gratings

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Experimental program
Comparison scheme
Effect test

Embodiment １

[0038] Prepare 0.1 mol / L ammonium hexafluorotitanate aqueous solution and 0.2 mol / L boric acid aqueous solution respectively, then mix the two solutions in equal volume, stir to make the mixed solution evenly mixed, and adjust the pH of the mixed solution with 0.01 mol / L ammonia water Adjust it to 3.9, pour the mixed solution into the reaction tank 2 of the long-period grating fixture 1, adjust the reaction temperature to 50°C, stop the reaction when the reaction time reaches 40min, and wash it with twice distilled water for 6 times. The refractive index sensitivity of fiber Bragg grating 3 to ethanol reaches 3300nm / RIU, which is 56 times higher than that without titanium dioxide nano film growth.

Embodiment 2

[0040] Add titanium tetrachloride to 1mol / L hydrochloric acid to prepare a titanium tetrachloride solution with a concentration of 0.5mol / L, stir evenly, pour the prepared solution into the reaction tank 2 of the long-period grating fixing device 1, and place The temperature of the reaction solution was adjusted to 90°C, the reaction was stopped when the reaction time was controlled for 55 minutes, and the reaction was fully rinsed with double distilled water. At this time, the refractive index sensitivity of the long-period fiber grating 3 to n-butanol reached 3500nm / RIU, which was higher than that of the ungrown titanium dioxide nanofilm. The time sensitivity has been increased by 115 times.

Embodiment 3

[0042] Prepare an aqueous solution of 0.001 mol / L titanium tetrafluoride, adjust the pH value of the solution to 2.88 with 0.01 mol / L dilute hydrochloric acid, and stir evenly. Pour the prepared solution into the reaction tank 2 of the long-period grating fixing device 1, adjust the temperature of the solution to 130°C, keep the temperature constant to make it react, stop the reaction after 50 minutes, and rinse it with twice distilled water for several times, at this time the long-period optical fiber The refractive index sensitivity of grating 3 to isopropanol reaches 1994nm / RIU, which is 39 times higher than that without growing titanium dioxide nano film.

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Abstract

The invention discloses a method for quickly regulating the refractive index sensitivity of long period fiber gratings. The detecting sensitivity is improved by quickly and controllably preparing titanium dioxide 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 quickly adjusting and controlling the refractive index sensitivity of long-period fiber gratings. Background technique [0002] Refractive index is one of the important optical parameters reflecting the nature of matter. Through the measurement of the refractive index, many properties such as the optical properties of the solution and the purity, concentration, and biochemical reaction parameters of the substance can be known. Therefore, the measurement of the refractive index is widely used in industrial production, environmental monitoring, food testing, clinical testing, drug screening, metallurgy and It has important research significance and wide application value in many fields such as scientific research, and more and more people pay more and more attention to the research on refractive index detection methods and devices. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/41G02B6/02
Inventor 李秋顺董文飞史建国马耀宏杨艳孟庆军常智敏
Owner BIOLOGY INST OF SHANDONG ACAD OF SCI
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