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Optical fiber temperature sensor and preparation method of cadmium sulfide films of optical fiber temperature sensor

An optical fiber temperature and cadmium sulfide technology, applied in the field of sensors, can solve the problems of complex coating, cutting and packaging processes, high cost of temperature demodulation system, lack of light absorption performance, etc., and achieves simple coating and manufacturing process and high accuracy , the effect of low cost

Active Publication Date: 2017-11-21
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] (1) Semiconductor materials such as silicon and germanium are used as temperature-sensitive materials. Since these materials are all indirect band gap semiconductor materials, their light absorption coefficient is much smaller than that of straight gap semiconductor materials, and they do not have excellent light absorption properties.
[0010] (2) Gallium arsenide and germanium are used as temperature sensing materials. Judging from the existing technical solutions, they are fixed to the end face of the optical fiber by bonding, and the coating, cutting and packaging processes are complicated.
[0011] (3) The cost of the temperature demodulation system used is relatively high

Method used

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  • Optical fiber temperature sensor and preparation method of cadmium sulfide films of optical fiber temperature sensor
  • Optical fiber temperature sensor and preparation method of cadmium sulfide films of optical fiber temperature sensor
  • Optical fiber temperature sensor and preparation method of cadmium sulfide films of optical fiber temperature sensor

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preparation example Construction

[0032] The invention provides a method for preparing a cadmium sulfide thin film for an optical fiber temperature sensor. CBD (chemical water bath method) is used to prepare a cadmium sulfide thin film. Multiple or continuous deposition, so the thickness of the grown film is controllable. The chemical reaction mechanism of preparing cadmium sulfide film is: based on the decomposition of thiourea in alkaline solution containing cadmium salt, the deposition of cadmium sulfide film. After deposition, it is annealed in a high-temperature oven at 200°C to make the film more uniform, denser and smoother.

[0033] Specific steps include:

[0034] Step S1: Fixing the Fiber

[0035] Fix the optical fiber with an optical fiber ferrule, inject high-temperature-resistant, soluble glue into the ferrule, and cure the glue so that the optical fiber and the ferrule are tightly fixed without loosening.

[0036] Step S2: Grinding the fiber

[0037] After curing, use an optical fiber grinder...

Embodiment approach

[0039] Use the previous chemical water bath method to coat the exposed end face of the optical fiber with the end face aligned with the ferrule with a cadmium sulfide film. The coating method is as follows:

[0040] (1) Get a certain quality of thiourea and dissolve it in deionized water, numbering solution A;

[0041] (2) Get a certain quality of cadmium sulfate and dissolve it in deionized water, numbering solution B;

[0042] (3) Measure 40-50mL of ammonia water with a mass fraction of 28%-35%, add it to solution B and stir, and number solution C;

[0043] (4) Measure a certain volume of deionized water and pour it into the reactor, then pour solution A and solution C into the reactor and mix to form a reaction solution, and immerse the exposed end face of the optical fiber in the reaction solution. Put the reactor into a water bath, set the reaction temperature to 60-70°C, and the reaction time to 9 minutes. At this point, the primary coating is completed;

[0044] (5) B...

Embodiment 1

[0051] Examples 1-8 all realized the deposition of cadmium sulfide film. Wherein, embodiment 1, embodiment 2, embodiment 3 obtain the scanning electron microscope picture of cadmium sulfide film respectively with reference to figure 1 (a)(b)(c), represented by figure 1 It can be seen that the molecular particles of the cadmium sulfide film obtained in Example 1 are smaller, more uniform and denser.

[0052]In addition, in conjunction with Examples 4-8, it can be seen that on the basis of the same reaction conditions, 4 layers, 1 layer, 2 layers, 3 layers and 5 layers of cadmium sulfide films were deposited respectively, and then by testing the cadmium sulfide films of different thicknesses transmittance spectrum. see figure 1 As shown, it can be seen that the absorption edge of the transmittance line is the best when the film is coated 4 times (the cadmium sulfide film has four layers).

[0053] Next, two different optical fiber temperature sensors were prepared using the ...

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Abstract

The invention provides a preparation method of cadmium sulfide films of an optical fiber temperature sensor. The preparation method comprises the following steps that after optical fibers are fixed to an insertion core, the exposed ends of the optical fibers are polished; film coating is conducted, wherein thiourea, cadmium sulfate and ammonium hydroxide are mixed according to the mass-volume ratio and dissolved in deionized water to form a reaction solution, wherein the mass-volume ratio of thiourea to cadmium sulfate to ammonium hydroxide is 5.694g:0.184g:45mL; then the exposed ends are inserted into the reaction solution, the reaction is conducted for 9 minutes by the use of the chemical water-bath method at the temperature of being 65 DEG C, and therefore film coating of one cadmium sulfide film is accomplished for the first time; the step of film coating is repeated for n times, and the exposed ends with the deposited (n+1) cadmium sulfide films are obtained, wherein the n is a natural number which is larger than 0; and annealing treatment is conducted on the optical fibers which are obtained through the repeated film coating step. According to the preparation method, the chemical water-bath method is adopted to achieve coating of the cadmium sulfide films, and therefore the cadmium sulfide films can be closely combined with the ends of the optical fibers, and the coating film thickness is controllable.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a sensor temperature regulation system. Background technique [0002] Optical fiber temperature sensor has the incomparable advantages of other temperature sensors, with the characteristics of anti-electromagnetic interference, high temperature resistance, high voltage resistance, chemical corrosion resistance and low loss, so it is widely used in high DC electric field, strong magnetic field, strong high frequency field, In harsh environments such as microwave fields. At present, the research content of fiber optic temperature sensors at home and abroad mainly focuses on three aspects: one is the research on temperature sensitive materials, and more semiconductor materials are applied to fiber optic temperature sensors; the other is the research on system structure and modulation technology; the third is the research on temperature sensitive materials. The research on productiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/31G01K11/32
CPCG01K11/32C23C18/31
Inventor 董玉明岳孟果杨春雷冯丽丽焦国华鲁远甫罗阿郁吕建成
Owner SHENZHEN INST OF ADVANCED TECH
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