Journal ArticleDOI
Fiber-optic liquid-level continuous gauge
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TLDR
In this article, an intensity-based fiber-optic liquid-level gauge for continuous measurement is described, which is based on the total internal reflection of light within the fiber optic, and for this, a measurement is made of the power attenuation which occurs in the fiber- optic immersed in the liquid tank when the liquid level varies.Abstract:
An intensity-based fiber-optic liquid-level gauge for continuous measurement is described. The sensing principle is based on the total internal reflection of light within the fiber optic, and for this, a measurement is made of the power attenuation which occurs in the fiber optic immersed in the liquid tank when the liquid level varies. The light from a LED is modulated before being directed into the fiber to minimize measurement errors. The device contains an alarm programmable to signal any liquid level in the tank (high or low), and data can be sent via Internet in real time to a distant point.read more
Citations
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Journal ArticleDOI
Fiber-optic sensor for liquid level measurement.
TL;DR: A novel liquid level sensor based on multimode interference (MMI) effects is proposed and demonstrated that exhibits a highly linear response with the sensing range and multiplexed operations easily controlled by just modifying the length of the no-core fiber.
Journal ArticleDOI
A self-calibration water level measurement using an interdigital capacitive sensor
TL;DR: A water level measurement using an interdigital capacitive sensor with low-cost, low-energy, good repeatability, high linearity, and ease of installation is proposed with a support of experimental results.
Journal ArticleDOI
A review of recent developed and applications of plastic fiber optic displacement sensors
TL;DR: The recent developed and applications of plastic fiber optic displacement sensors (FODSs) based on intensity modulation technique are reviewed in this article, where the approaches to achieve high sensitivity and large linear range are normally categorized into two areas, namely the design of sensor probe and the target reflector.
Journal ArticleDOI
Liquid-level measurement using a single digital camera
TL;DR: An imaged-based measurement system using a single digital camera and a circular float to measure fill levels in liquid tanks is proposed in this paper and can be significantly improved.
Journal ArticleDOI
A quasi-distributed level sensor based on a bent side-polished plastic optical fibre cable
TL;DR: In this paper, a flexible quasi-distributed liquid level sensor based on the changes in the light transmittance in a plastic optical fiber (POF) cable is proposed, where measurement points are constituted by small areas created by side-polishing on a curved fibre and the removal of a portion of the core.
References
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Journal ArticleDOI
Fiber-optic liquid-level sensor using a long-period grating
TL;DR: A liquid-level sensor based on the refractive-index sensitivity of long-period fiber-optic gratings is proposed and demonstrated and shows a large linear range.
Journal ArticleDOI
Fiber-optic liquid-level sensor
TL;DR: In this article, an intensity-based fiber-optic liquid-level sensor for point measurement is described, where the sensing principle is based on the total internal reflection of light which is disturbed by contact with a liquid.
Journal ArticleDOI
Liquid-level sensor with optical fibers
Katsuharu Iwamoto,Isao Kamata +1 more
TL;DR: In this paper, a liquid-level sensor consisting of three optical fibers is described, where a light is projected onto an oil surface through a transmitting fiber and a receiving fiber picks up the light reflected from the oil surface.
Journal ArticleDOI
Multi-sensor system using plastic optical fibers for intrinsically safe level measurements
TL;DR: In this article, a system for measuring liquid level in multiple tanks using optical fiber technology has been developed, which is based on amplitude variations as a function of the liquid distance and not in time of flight or phase detection.