Optical fiber sensing system for simultaneously measuring liquid level and liquid temperature and measuring method thereof
A technology of optical fiber sensing system and liquid temperature, which is applied in the field of optical fiber sensing system and its measurement, can solve the problems of small measurement range, low measurement accuracy, and measurement accuracy easily affected by the external environment, and achieve high precision in a wide range Effects of liquid level and liquid temperature monitoring
Active Publication Date: 2019-02-22
HUAZHONG UNIV OF SCI & TECH
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[0004] Aiming at the defects of the prior art, the present invention proposes an optical fiber sensing system and its measurement method for simultaneous measurement of liquid level and liquid temperature, aiming to solve the problem that the existing optical fiber liquid level sensor has a small measurement range and the measurement accuracy is easily affected by the external environment. The problem of low measurement accuracy
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[0025] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
[0026] The invention relates to an optical fiber sensing system for simultaneous measurement of liquid level and liquid temperature, such as figure 1 As shown, this embodiment includes: a threaded package tube, a microstructured optical fiber 5 and a coherent phase demodulation device. Use a 248nm UV laser to focus the beam and write scatter enhancement points on the anti-bending single-mode fiber to make microstructure fiber 5. The distance between adjacent scatter enhancement points is 2m, and the reflectivity is -50dB; the threaded package tube is made of aluminum with an outer diameter of ...
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Abstract
The invention discloses an optical fiber sensing system for simultaneously measuring liquid level and liquid temperature and a measuring method thereof. The optical fiber sensing system comprises a threaded encapsulating pipe, a microstructure optical fiber and a coherent phase demodulation device, wherein the microstructure optical fiber is embedded into a threaded groove of the threaded encapsulating pipe, one end of the microstructure optical fiber is connected into the coherent phase demodulation device, and the other end of the microstructure optical fiber is connected into a to-be-measured liquid; the surface of the threaded encapsulating pipe is coated with a layer of soft glue for encapsulating and protecting the microstructure optical fiber. The coherent phase demodulation deviceis used for demodulating distributed sensing signals in the microstructure optical fiber, measuring the temperature response of each independent sensing section in the microstructure optical fiber, and calculating the liquid level and the liquid temperature. The height of the liquid level is roughly determined according to the sensing sections of liquid surface temperature abrupt change parts; then, the height of the liquid level is accurately determined according to the relationship between phase changes of the sensing sections and the height of the liquid level, so that full-distributed sensing is achieved, the system response dynamic range is wide, the measurement precision is high, the response speed is high, and the application range is wide.
Description
Technical field [0001] The present invention relates to the field of optical fiber sensing, and more specifically, to an optical fiber sensing system for simultaneous measurement of liquid level and liquid temperature and a measurement method thereof. Background technique [0002] Liquid level and temperature monitoring are very important in fields such as oil transportation and storage, chemical processing, flood warning, and wastewater treatment. For example, in an oil storage tank, accurate measurement of liquid level and oil temperature can understand the production and storage conditions in real time, ensure safe and stable production and storage, and have a great impact on inventory management and economic operations. The current mainstream liquid level sensors are all based on electrical sensing. For example, the existing capacitive sensor requires a metal capacitor plate and metal wiring to be placed in the tank. This kind of electrical wiring requires careful shielding...
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IPC IPC(8): G01F23/292G01K11/32
CPCG01F23/292G01K11/32
Inventor 孙琪真张威艾凡闫志君周玮刘德明
Owner HUAZHONG UNIV OF SCI & TECH