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U-shaped humidity-sensitive optical fiber sensor and manufacturing method thereof
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A technology of optical fiber sensor and manufacturing method, which is applied in the field of hydrogen gas sensors, and can solve the problems of low light radiation intensity on the surface of optical fiber, low interaction intensity between light and measured parameters, and low sensor sensitivity
Active Publication Date: 2021-07-06
CHONGQING UNIV OF TECH +1
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The optical transmission inside the communication plastic optical fiber is based on the core-cladding film. The light beam is mainly limited to the internal transmission of the optical fiber. The optical radiation intensity on the surface of the optical fiber is low, and the interaction between light and the measured parameter is low, resulting in low sensor sensitivity.
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Embodiment 1
[0029] Example 1, see figure 1 , a kind of manufacture method of U-shaped moisture-sensitive optical fiber sensor, this method comprises the steps:
[0030] Step A, fiber grating pretreatment: take a piece of optical fiber, which has an optical fiber core 3, an optical fiber cladding 2 and a protective layer 1; first remove the protective layer of the middle section of the optical fiber, and then use a particle size of 3-5 μm Grind the middle section of the optical fiber to 200-91500μm to obtain a fiber core with a rough surface; then bend the polished optical fiber into a U shape, put it in an oil bath at 110-150°C and heat it for 2-3 minutes Take it out, cool it to room temperature and shape it, and obtain a U-shaped optical fiber 6 with a fixed shape.
[0031] Step B, preparation of U-shaped optical fiber with sensitizing film:
[0032] Step B1, first dissolve polysulfone, a light-guiding material, in a dimethyl sulfoxide solution, wherein the mass ratio of polysulfone to...
Embodiment 2
[0043] Embodiment 2. A U-shaped humidity-sensitive optical fiber sensor prepared according to the manufacturing method of a U-shaped humidity-sensitive optical fiber sensor described in Embodiment 1.
Embodiment 3
[0044] Embodiment 3 is different from Embodiment 1:
[0045] In step A, the length of the middle section of the optical fiber is 5 cm and is ground to 900 μm, and the bending radius of the U zone is 2 cm.
[0046] The thickness of the sensitive film F formed in step B4 is 200 μm, and the thickness of the humidity sensitive film F formed in step C5 is 20 μm.
[0047] The U-shaped humidity-sensitive optical fiber sensor obtained in Example 3 was subjected to a humidity response test at 40°C, and the response characteristics of humidity were obtained as follows: figure 2 , figure 2 , the sensor output light intensity I out Has a linear relationship with relative humidity (x): I out =-0.9165x+554.05.
[0048] (R 2 =0.9817), the x range is 10-80%RH, and the sensitivity reaches -0.9nW / (1%RH), which is 6.9 times that of coating a 10μm humidity-sensitive film on the surface of a 1500μm optical fiber. U-shaped structure, high refractive index of sensitizing film, GeO 2 Light s...
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Abstract
The invention discloses a manufacturing method of a U-shaped humidity-sensitive optical fiber sensor. The manufacturing method of the U-shaped humidity-sensitive optical fiber sensor is characterized by comprising the following steps: step A, preprocessing an optical fibergrating: firstly, removing a protective layer of a middle section of a section of optical fiber, then grinding the middle section of the optical fiber to 200-91500 microns, and bending the ground optical fiber into a U shape; step B, preparing a U-shaped optical fiber with a sensibilization film: step B1, firstly dissolving a light guide material polysulfone in a dimethyl sulfoxide solution, then adding germanium dioxide into the solution, and uniformly stirring to obtain polysulfonegermanium dioxide sol; and step C, preparing the humidity-sensitive optical fiber sensor. The U-shaped humidity-sensitive optical fiber sensor with the humidity-sensitive film and the sensibilization film can be widely applied to the fields of energy, chemical industry, biochemical detection and the like.
Description
technical field [0001] The invention relates to a hydrogen sensor, in particular to a U-shaped humidity-sensitive optical fiber sensor and a manufacturing method. Background technique [0002] Humidity is an important parameter affecting the safe operation of electrical control cabinets and communication rooms. In order to maintain the humidity in the power distribution room within the normal allowable relative humidityworking range of the device (the maximum allowable relative humidity is 75% RH), improve the service life of the device, and ensure its safe operation, the humidity in the power distribution room must be monitored in real time. [0003] At present, there are many sensors used for humidity measurement, among which optical fiber sensors have been widely used due to their advantages of anti-electromagnetic interference, chemical corrosion resistance, long-distance transmission, fast response, and high sensitivity. Among optical fiber humidity sensors, plastic o...
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