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
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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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