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Method for measuring humidity of cable by two-way infrared spectrum analysis method

A technology of infrared spectroscopy and measuring cables, which is applied in the direction of material analysis, measuring devices, and analyzing materials through optical means. It can solve the problems of complex process, expensive equipment, and high cost, and achieve good sensitivity, excellent linear relationship, and sensitive response. Effect

Active Publication Date: 2021-03-26
中电保力(北京)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical vapor deposition and magnetron sputtering coating methods can also be used. Although the uniformity of graphene oxide is good, the process is complicated and the equipment is expensive, resulting in high cost. As an industrialized large-scale production, it does not have industrial advantages and convenient
Moreover, the test using electrical signals is not applicable inside the cable, because the transmission of electrical signals always involves the use of metal materials, which is not safe for the operation of the cable

Method used

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  • Method for measuring humidity of cable by two-way infrared spectrum analysis method
  • Method for measuring humidity of cable by two-way infrared spectrum analysis method
  • Method for measuring humidity of cable by two-way infrared spectrum analysis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1) Take a clean watch glass, put it into deionized water, dissolve the graphene oxide powder in deionized water, and disperse it with ultrasonic waves for 2 hours to prepare a 2.5% graphene oxide dispersion;

[0042] 2) Dip the PTFE tip into the above-prepared graphene oxide dispersion, hang it vertically with the head down, and put it in a drying oven at 30°C for about half an hour without wind;

[0043] 3) Use an electron microscope to check the graphene oxide attached to the surface of the matrix resin. If it is fully covered, it is qualified. If it is not fully covered, the operation can be repeated;

Embodiment 2

[0045] 1) Cut Ni-Fe-based graphene oxide into 2mm-3mm squares, take a clean watch glass, and put it into electronic grade 60% FeCl 3 Solution, put the above square into the corrosion solution, make it float on the surface, accelerate the corrosion, after 3 hours of corrosion, it can be observed that the Ni-Fe base falls off, transfer the graphene oxide to deionized water with a silicon dioxide substrate and soak After more than 12 hours, the graphene oxide material is prepared; the concentration of graphene oxide in deionized water is 2%.

[0046] 2) Use the end of polytetrafluoroethylene to transfer the graphene oxide to the end of the matrix resin from underwater, and put it in a drying oven at 30°C for about half an hour without wind;

[0047] 3) Use an electron microscope to check the graphene oxide attached to the surface of the matrix resin, and it is qualified if it is completely covered.

Embodiment 3

[0049] 1) Preparation of anionic assembly: 85 mg of graphene oxide was dispersed in 50 mL of water and MDF in a mixed solvent with a mass ratio of 1:2, and mixed evenly to obtain a graphene oxide dispersion, and 4.5 g of methacrylic acid and 0.5g of isobornyl acrylate, slowly drop 0.1g of 10% ethyl acetate solution of azobisisobutyronitrile under a nitrogen atmosphere, react at 60°C for 4h, after the reaction, adjust the pH with 10% sodium bicarbonate to 9. Centrifuge 3 times, add deionized water each time, and finally dilute with deionized water, obtain a dispersion of graphene oxide-polyacrylic acid composite after ultrasonication, and the concentration of graphene oxide in the dispersion is about 0.31wt%.

[0050] 2) Preparation of cationic assembly: In 180mL isopropanol and butyl acetate mixed solvent with a volume ratio of 1:1, add 10g butyl acrylate, 7g hexafluorobutyl acrylate, 6g dimethylaminoethyl acrylate, 2.7g For 4-hydroxybutyl acrylate, slowly add 2.8g of 10% ethy...

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Abstract

The invention relates to a method for measuring the internal humidity of a cable by using a two-way infrared spectrum analysis method, which comprises the following steps of: irradiating the same position of a test material by using two-way infrared light, testing the intensity of reflected light, calculating the absorbance, and calculating the internal humidity of the cable according to a linearrelation formula of an absorbance-humidity standard curve, wherein the test material is formed by coating a hydrophobic base material with a water absorbing material. The humidity is detected by adopting infrared light of double light paths, the reaction is sensitive, rapid water-vapor balance can be achieved by adopting a high-water-absorption material, the absorbance is calculated by adopting anoptical cable, convenience and rapidness are achieved, and the water content condition in the cable can be conveniently monitored in real time. The established linear relation between the humidity and the absorbance is excellent, the sensitivity is good, and when graphene oxide is adopted as a water absorbing material, the corresponding sensitivity to the humidity change is 0.0065 (absorbance)%-1.

Description

technical field [0001] The invention belongs to the technical field of humidity sensors, and in particular relates to a method for measuring the internal humidity of cables by a dual-path infrared spectroscopic analysis method. Background technique [0002] Our country is a big power country, and the cable is made of one or more mutually insulated conductors covered with an insulating layer and a protective layer, and is used to transmit electricity or information from one place to another. Usually overhead cables or underground cables. Cables have very high requirements for waterproof and moisture-proof. Once the cable is flooded and damp, it will gradually form water branch discharge under the action of high-voltage electromagnetic field, destroying the main insulation, until the breakdown discharge. Therefore, the quality assurance of cable construction and laying is very important for the reliable operation of cables in the future; water ingress in power cables is extre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3554G01N21/3563
CPCG01N21/3554G01N21/3563G01N2021/3572
Inventor 王宏伟王少华王宇川张海凤
Owner 中电保力(北京)科技有限公司
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