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Intensity-Based Optical Systems for Fluid Level Detection

机译:用于液位检测的基于强度的光学系统

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摘要

In this work different patented optical sensing solutions are reviewed, mostly for their application of measuring fluid level within tanks, containers or bio-mass boilers in condominiums, thus providing an intrinsically safe sensing scenario within harsh and hazardous environments, due to the passive nature of light. In general, the intensity modulation of the light is very attractive since it is simple in concept, reliable, and can produce optical sensors which offer a wide range of applications at lower costs, thus facilitating their final commercialization and market spread. The optical sensing solutions discussed in this work include a fiber-optic sensor for fluid detection/level with intrinsic self-referencing property thus solving one of the main drawbacks when using intensity-based sensors, namely the undesirable and unexpected optical power fluctuations when operating. Moreover, a low-cost intensity-based POF sensor for fuel level measurements in paramotoring and powered paragliding is presented. It features a very simple and a very low-cost solution for these sports, attending the increasing demand of new and more sophisticated embedded sensors in the flight instrumental. Going on from this, a fiber-optic fluid level sensor for a range greater than 2m is described. The system uses a single lens and a single fiber but being possible to increase the measuring safety area by optical multiplexing. Finally, a fluid level sensor based on a Light Dependent Resistor (LDR), which includes a temperature control scheme, is presented. Its final embodiment design is also shown and described.
机译:在这项工作中,对不同的专利光学传感解决方案进行了综述,主要是因为它们在测量公寓中的水箱,容器或生物质锅炉内的液位方面的应用,因此,由于传感器的被动性质,因此可以在恶劣和危险的环境中提供本质安全的传感方案。光。通常,光的强度调制非常吸引人,因为它的概念简单,可靠,并且可以以较低的成本生产出可提供广泛应用的光学传感器,从而有利于其最终的商业化和市场推广。在这项工作中讨论的光学传感解决方案包括一个具有固有自参考特性的,用于流体检测/液位的光纤传感器,从而解决了使用基于强度的传感器时的主要缺点之一,即工作时不希望的和意外的光功率波动。此外,提出了一种低成本的基于强度的POF传感器,用于动力滑翔和动力滑翔伞中的油位测量。它为这些运动提供了一种非常简单且成本非常低廉的解决方案,满足了飞行器中对新型,更先进的嵌入式传感器的日益增长的需求。由此,描述了一种用于大于2m的范围的光纤液位传感器。该系统使用单个透镜和单个光纤,但是可以通过光学复用来增加测量安全区域。最后,提出了一种基于光敏电阻(LDR)的液位传感器,其中包括温度控制方案。还示出并描述了其最终的实施例设计。

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