Method for detecting pH value using hydrogel-coated modified interference-type optical fiber
An optical fiber detection and hydrogel technology, which is applied in the field of environmental pollution detection, can solve the problems of complex production process, high sensitivity and low sensitivity, and achieve the effects of simple production process, high sensitivity and small volume.
Active Publication Date: 2021-02-19
BEIJING INFORMATION SCI & TECH UNIV
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Problems solved by technology
Some of these optical fiber sensors are simple to make but low in sensitivity, and some are high in sensitivity but complex in manufacturing process and high in cost.
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[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.
[0023] A method for manufacturing a double-cone cascaded MZI interference structure strain sensor, comprising: taking two single-mode optical fibers, cutting both ends of each single-mode optical fiber flat, and for standby; the single-mode optical fiber is the American Corning SMF28 single-mode optical fiber;
[0024] Butt one end of two single-mode optical fibers, use a fusion machine to perform fusion splicing, and then taper the two single-mode optical fibers respectively to obtain the same tapered structure; the fusion splicer is Fujikura Japan 80S optical fiber fusion splicer;
[0025] Using the method of spin coating, the hydrogel is coated on the surface of one of the cone structures with a pipette, and after UV curing, a bicone cascaded MZI interference structure strain sensor is obtained, such as fi...
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Abstract
The invention discloses a method for detecting the pH value of an interference optical fiber coated and modified by hydrogel, comprising: butting one end of two single-mode optical fibers, using a melting machine to perform fusion splicing, and then tapering the two single-mode optical fibers respectively , to get the same cone structure; use the spin coating method to coat the hydrogel on the surface of one of the cone structures, and obtain a bicone cascade MZI interference structure strain sensor after UV curing; the bicone cascade MZI interference structure When the structural strain sensor is placed in the environment to be tested, the hydrogel will shrink or expand to generate axial stress to pull the cone region to stretch or shrink radially, and the pH value can be measured by changing the length of the cone region. The interference structure strain sensor of the present invention adopts a bicone cascade structure, has high sensitivity, and can realize continuous measurement of pH value. The bicone cascade MZI interference structure strain sensor of the present invention has simple manufacturing process, low manufacturing cost, and has a large market potential.
Description
technical field [0001] The invention relates to the technical field of environmental pollution detection, in particular to a method for detecting pH value using a hydrogel-coated and modified interference-type optical fiber. Background technique [0002] In the fields of environmental protection and meteorological applications, the detection of pH value is of great significance. In recent years, many cities in our country have been frequently attacked by smog weather, and PM2.5 (ie "fine particulate matter") has also become a well-known word that is often talked about. At the same time, the smog problem has aroused public anxiety about environmental pollution and expectations for environmental monitoring and governance. Among them, sulfur dioxide and other acid gases, which are the main culprit of smog together with "fine particulate matter", have caused environmental hazards such as "acid rain" long ago, and have attracted people's attention. Therefore, the detection of p...
Claims
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IPC IPC(8): G01N21/45
CPCG01N21/45G01N2021/458
Inventor 张雯董明利刘小龙何巍祝连庆娄小平刘锋
Owner BEIJING INFORMATION SCI & TECH UNIV