A method and system for measuring the thickness of multiphase liquid based on chaotic Brillouin scattering
A technology of Brillouin scattering and liquid thickness, which is applied in the direction of measuring devices, instruments, and optical devices, can solve the problems of high cost, fuel adhesion, multi-phase medium measurement that cannot be layered, etc., and achieve high reliability and improved The effect of precision and simple structure
Active Publication Date: 2020-07-10
HUAZHONG UNIV OF SCI & TECH
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[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method and system for measuring multiphase liquids based on chaotic Brillouin scattering, thereby solving the problems of complex production, high cost and the presence of fuel oil in the existing optical fiber oil level sensor. The problem of adhesion leads to low measurement accuracy, and the technical problem that it cannot be measured for stratified multi-phase media
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[0036] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0037] Based on this, the present invention designs a multiphase fuel oil measurement system based on chaotic Brillouin scattering. Due to its low coherence, chaotic laser has great advantages in positioning, and the positioning accuracy can reach mm level. At the same time, the Brillouin scattering optical fiber sensing system has important applications in the field of distributed sensing. Ho...
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The invention discloses a method and system for measuring multi-phase liquid thickness based on chaotic Brillouin scattering. The method comprises a step of controlling the temperatures of different phase liquid mediums in a container to be different such that a temperature change occurs at a junction of adjacent two phase liquid mediums, a step of introducing two chaotic lasers at different heights of the liquid mediums of the container, wherein one chaotic laser generates a Brillouin scattering effect in the liquid mediums, the other chaotic laser and chaotic Stokes light generated in the Brillouin scattering effect are subjected to beat frequency to obtain a beat frequency spectrum, and each beat frequency spectrum is corresponding to one Brillouin frequency shift, if two chaotic lasersare introduced at the junction of two adjacent liquid mediums, the temperature change causes Brillouin frequency shifts corresponding to two chaotic lasers to generate frequency shift change points,and a step of determining the thickness of each phase liquid medium by determining the height of a liquid medium corresponding to each frequency shift change point. According to the invention, the measurement of the thickness of multiple phases of liquid mediums can be achieved.
Description
technical field [0001] The invention belongs to the technical field of optical fiber sensing, and more specifically relates to a multiphase liquid thickness measurement method and system based on chaotic Brillouin scattering. Background technique [0002] Liquid level measurement has important applications in the fields of industrial production, oil storage and transportation, and manufacturing. Especially in the process of oil storage and transportation, accurate measurement of oil level can greatly improve economic benefits. In oil storage tanks, there are generally multiple layers of media. These media form layers in the oil storage tank due to their different densities. Generally speaking, the media in the oil storage tank are gas, crude oil, and oil from top to bottom. Water-oil mixed layer, water and impurity layer. Most oil level measuring devices can only obtain the height of the overall liquid, but cannot obtain the specific height of each medium, thus affecting th...
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IPC IPC(8): G01B11/06
CPCG01B11/0608
Inventor 夏历向远卓
Owner HUAZHONG UNIV OF SCI & TECH