Optical fiber sensing system and measurement method for simultaneous measurement of liquid level and liquid temperature

Abstract

The invention discloses an optical fiber sensing system and a measurement method thereof for simultaneous measurement of liquid level and liquid temperature. The optical fiber sensing system includes a threaded packaging tube, a microstructured optical fiber and a coherent phase demodulation device, wherein the microstructured optical fiber is embedded in the threaded packaging tube One end is connected to the coherent phase demodulation device, and the other end is connected to the measured liquid; the surface of the threaded packaging tube is coated with a layer of soft glue to encapsulate and protect the microstructure optical fiber; the coherent phase demodulation device is used for demodulation Distributed sensing signals in microstructured optical fibers, measure the temperature response of each independent sensing segment in microstructured optical fibers, and calculate liquid level and liquid temperature. The present invention roughly locates the liquid level height according to the sensing section at the sudden change position of the liquid surface temperature, and then accurately locates the liquid level height according to the relationship between the phase change of the sensing section and the liquid level height, so as to realize fully distributed sensing, and the system responds with a large dynamic range, High measurement accuracy and fast response, wide application range.

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 storage temperature can understand the production and storage status 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 electrical wiring requires careful shielding, bo...

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Problems solved by technology

[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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