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Device for monitoring temperature of oil tank by FBG (Fiber Bragg Grating)

A fiber grating and oil tank technology, applied in measuring devices, thermometers, thermometers with physical/chemical changes, etc., can solve the problems of complex equipment and low sensitivity, and achieve the effects of increasing reliability, reducing costs, and measuring quickly

Inactive Publication Date: 2012-07-25
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the systems used to measure the temperature of oil tanks mostly rely on platinum thermal resistance temperature sensors to measure oil temperature. The equipment is complex, the sensitivity is low, and it is greatly affected by external factors. For example, the patent number is 200920251207.0, and the utility model name is "Oil Tank Thermometer". patent, which is the case

Method used

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  • Device for monitoring temperature of oil tank by FBG (Fiber Bragg Grating)
  • Device for monitoring temperature of oil tank by FBG (Fiber Bragg Grating)
  • Device for monitoring temperature of oil tank by FBG (Fiber Bragg Grating)

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Experimental program
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Effect test

Embodiment 1

[0036] Embodiment 1 of the present invention such as figure 1 As shown, a device for monitoring the temperature of an oil tank with an optical fiber grating includes an ASE light source 1, a 3db coupler 2, an optical switch 3, a spectrum demodulator 4, a computer 5, a splitter 6, and an optical fiber grating 8. The feature is that the ASE light source 1 is connected to the input end of the 3db coupler 2 through an optical fiber, the output end of the 3db coupler 2 is connected to the optical switch 3 by an optical fiber, and the output end of the optical switch 3 is connected to the 6-phase splitter through an optical cable. connection, the output end of the splitter 6 is connected to the multi-channel fiber grating 8 through the optical cable 7; the other output end of the 3db coupler 2 is connected to the spectrum demodulator 4 by an optical fiber, the spectrum demodulator 4 and the computer 5 Connected; computer 5 and alarm 10 are connected.

[0037] The fiber grating 8 is...

Embodiment 2

[0040] Same as embodiment 1, except that the number of optical fiber gratings is 64, and each oil tank is provided with 4 optical fiber grating monitoring points, and 16 oil tanks are monitored simultaneously by switching the optical switch 3 .

Embodiment 3

[0042] The method for using the above-mentioned device to monitor temperature, the steps are as follows:

[0043] 1. Temperature calibration of fiber grating

[0044] Connect the device well, place the fiber grating for temperature measurement in the constant temperature device, change the temperature in the constant temperature device, and use the temperature characteristic curve T of the fiber grating 0 -λ 0 Measure and determine the one-to-one correspondence between the central wavelength of the fiber grating and the temperature, and record it by the computer; determine the drift range of the central wavelength of the fiber grating according to the safe oil temperature value of the oil tank, and set the safe oil temperature as T min -T max , corresponding to the central wavelength of the fiber grating is λ min -λ max Repeat the above-mentioned calibration process for each fiber grating for temperature measurement, and complete the temperature calibration of the fiber gr...

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Abstract

The invention relates to a device for monitoring the temperature of an oil tank by FBGs (Fiber Bragg Grating) and belongs to the technical field of FBG detection. The device comprises an ABE (Amplified Spontaneous Emission) light source, a spectrum demodulation instrument, a computer and the like and is characterized in that the ASE light source is connected with the input end of a 3db coupler by an optical fiber; one output end of the 3db coupler is connected onto an optical switch by an optical fiber; the output end of the optical switch is connected with a splitter by an optical cable; the output end of the splitter is connected with a plurality of FBGs by optical cables; the other output end of the 3db coupler is connected onto the spectrum demodulation instrument by an optical fiber; the spectrum demodulation instrument is connected with the computer; and the computer is connected with an alarm. According to the device disclosed by the invention, the temperature calibration is firstly carried out and then the temperature of the oil tank is timely monitored; and the device has the advantages of rapidness, accuracy, sensitivity, safety and stability for measuring and capability of simultaneously measuring the oil temperature and the oil gas temperature by the computer and can replace an original complex measurement instrument easy to influence by external factors, so that the cost is reduced.

Description

technical field [0001] The invention relates to a device for monitoring the temperature of an oil tank with an optical fiber grating, which belongs to the technical field of optical fiber grating detection. Background technique [0002] According to the important property that the fiber grating can reflect light of a specific wavelength, the fiber grating will reflect light of different wavelengths under different temperature, medium and other conditions. Using the property of the fiber grating to use the fiber grating as a sensor temperature and other sensing systems has been It is widely used in many fields of production and life. During storage of petroleum products, due to the characteristics of thermal expansion of oil, as the temperature rises, the volume of oil in the tank will expand due to heat. Crude oil must have a certain storage time in the storage tank of the oil depot. With the increase of time, the temperature of crude oil will gradually drop, and its temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32G01K11/3206
Inventor 常军高阳孔德龙李道静刘永宁孙柏宁罗沙王宗良
Owner SHANDONG UNIV
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