The optical phase detection circuit, light source and digital signal processor are contained. Applications include current measurement for process control and protection in the electrowinning industry, for example. Szatkowski a fiberoptic current sensor for lightning measurement applications. In this paper a new fulloptical current sensor is designed. Fiber optic current sensor pdf download preladgechan. An optical load sensor having an elongate configuration for placement in a road surface in a plane substantially parallel to the road surface to detect vehicles traversing the road surface by sensing the load exerted by each such vehicle on the sensor as a force applied transversely to the longitudinal axis thereof, the sensor having at least one optical fiber mounted on a hard support. The fiber optic current sensor is based on faraday rotation effect and can overcome most limitations of traditional current sensors, making accurate direct aircraft lightning measurement feasible and affordable. This site provides information useful for people involved in manufacturing to select sensors.
Focs fibre optic current sensor for measuring high dc currents. The heatresistant type fiber unit enables detection in high temperature environments. The easy and flexible use characterizes this technical innovation. The new edition of this seminal work highlights the development of fiber optic sensors, while providing an overview of current methods for the construction of highspeed and highcapacity fiber optic systems. This site is like a library, use search box in the widget to get ebook that you want. The shown figure gives an idea about how the light intensity work as a sensing parameter as well as how this arrangement makes the fiber to work as a vibration sensor. Sep 07, 2011 various applications of fiber optic current sensor are explored now. Apr 01, 2003 fiberoptic current sensor fiberoptic current sensor lin, wuuwen 20030401 00. Pdf a fiberoptic current sensor for lightning measurement. This approach is distinct from previous work on online insitu monitoring sensors in that the transducer is simply the fiber optic epoxy interface. Glass fibers are mostly used in challenging environments, such as applications with high. A fiberoptic current sensor for lightning measurement. The plasma current is an essential parameter for tokamak operation.
Optical fibre current sensor for electrical power engineering. A novel temperature compensation method for alternating current measurements is demonstrated, exploiting the temperature dependence of the faradaymirror rotation angle. The sensor is based on a covalently bound fluorescent dye immobilized within a waterpermeable polymer. A fiber optic current sensor is successfully developed with many potential applications for electric current measurement. Fiber optic systems are typically used in harsh conditions, including high vibration, extreme heat, and noisy, wet, corrosive or explosive environments. Applied sciences free fulltext optical current sensors for high. The seal wire operated under shortcircuit conditions, i. Fiber optics current sensor free standing focsfs enabling.
Universal reflex sensors can be used both with and without fiber optic cables. Highspeed, highaccuracy, digital inductive displacement sensors exv series. Fiberoptic current and voltage sensors for highvoltage. The fiber sensor can be either an intrinsic oneif the modulation takes place directly in the fiber or extrinsic, if the modulation is performed by some external transducer as depicted in fig. Abb fiberoptic current sensors focs for the measurement of high dc currents such as in. Pdf an opticalfiber sensor based on faraday effect is developed for measuring total lightning. Particular attention is devoted to niche applications where fiber optic sensors are or soon will be able to compete with conventional approaches.
Fiber optic sensors available for download and read online in other formats. The latest generation of fiber optic current sensors has. The intrinsic advantages of optical sensor technology are very appealing for high voltage applications and can become a valuable asset in a new generation of. By using a singleended optical fiber around the current conductor that utilizes the magnetooptic effect faraday effect, focs measures uni or bidirectional dc currents of up to 600 ka within 0. Such an fiber optic current sensor focs was successfully installed on the experimental advanced superconducting tokamak east. The physical phenomenon and construction of optic fiber sensors are discussed in this paper. Fiber optic cable sensors analyze the light reflected by the object. Features and advantages of fiber optic sensor sensor basics. It shows a sensitivity of 126 hza that is very close to the maximum sensitivity obtained by using fibers without linear birefringence.
Fiber optic sensors ii download ebook pdf, epub, tuebl, mobi. In fact, those used for highend currents can weigh as much as 2000 kg compared to fiber optic current sensors sensing heads, which weigh less than 15 kg. We have developed a fiber optic chemical sensor for online monitoring of fermentation ph. The sensor overcomes the drawbacks of the classical transducers and offers superior performance and functionality. Intensity based fiber optic sensors require more light and these sensors use a multimodelarge core fibers. With over 30 years experience of the specialty optical fiber industry, fibercore ltd, the world leader in its field, is exclusively dedicated to the design, manufacture and commercialization of specialty fibers.
The response of the sensor is a function of the mismatch in refractive index between the fiber optic endresin interface. The output switches when an object reaches the selected range detec. Current status of optical fiber biosensor based on surface. The optical fiber follows a circuitous path and is adapted to establish a detection zone. Through the process of researches and developments of optical fiber current sensors for a long time, the. Abb fiberoptic current sensor focs for high dc currents. The sensor is based on two counterpropagating brillouin lasers circulating in a fiber ring cavity. Pdf fiberoptic current and voltage sensors for high. Fiberoptic dc current sensor for the electrowinning. The fiberoptic current sensor is based on faraday rotation effect and can overcome most limitations of traditional. Beyond novel methods for the sensing of traditional parameters such as strain, temperature, and pressure, a variety of new ideas and concepts are proposed and explored. They are used for measuring the current magnetic field, displacement, temperature, pressure, acoustic vibration, etc. Fiber optic current sensors designing are designed. Fiber optic current sensors and optical current transformers version.
Conference on optical fibre sensors, bruges, belgium, may 2327, 2005. The limitations due to the kerr effect and optical feedbacks in the. The description is limited to those sensors that are potentially applicable. We present a lowcost fiber optic current sensor employing a faraday rotator mirror for passive phase biasing. It allows flexible selection of installation location and can be used in various environments. Fiberoptic current sensor for the electrochemical industry. Fiber optic sensing represents a pinnacle of current day sensor technology. Fiber optic sensors fundamentals and applications, fourth edition, 2014 available at. A novel reciprocal brillouin fiber optic current sensor has been developed and tested. Pdf fiberoptic current sensor for electrowinning of. With over thirty years of experience in the fiber optic sensor field, he has made fundamental contributions to fiber rotation, acceleration, acoustic, pressure, strain, vibration, temperature, humidity, and corrosion sensors. A robust interferometric fiber optic current sensor with inherent temperature compensation of. The fiber optic current sensor is based on the faraday rotation effect, and moreover, in this paper the mechanism of faraday rotation effect of cylinder fiber model is explained. Fiber optic current sensors are able to replace existing solutions based on the hall effect, which tend to be bulky and heavy.
Based on the magneto optic effect faraday effect in a singleended optical fiber around the current conductor, the focs can measure uni or bidirectional dc currents up to 500 ka with an accuracy of 0. Abb focs brochure english pdf brochure fiberoptic current sensor for the electrochemical industry english pdf article. This paper describes the development and applications of a fiber optic electric current sensing technique with the stable properties and compact, simple, and flexible structure of the sensing device. Gradually, fiber optic sensors are replacing sensors with mechanical and electrical conversion of the measured parameter to the information signal. A fibre optic sensor is a photoelectric sensor with optical fibre connected to its light source.
Lundberg, an inband osnr monitoring method for polarization multiplexed qpsk signals. In the following a highly accurate fiber optic current sensor focs is presented for rated currents up to 500 ka. Introduction in recent years optical current and voltage. This type of technology allow for real time measurements of long assets such as pipelines, conveyers and fences by monitoring changes that occur in a fiber optic cable affixed to the asset. Since no electric current flows through the optical fiber cable, the sensor is unaffected by electrical noise. Mode fiber as a faraday element in an inte rferometric fiber optic current sensor.
Osa error characteristic analysis and experimental research. Osa temperaturecompensated fiberoptic current sensor with. Fiber optic current sensors and optical current transformers. Fiber optic current sensor for electrowinning of metals. The sensor is a spinoff of a current sensor for applications in highvoltage substations 1. When a current passes through a metalcoated optical i ber, the ohma s heat induces a phase change of the guided light within the i ber. An optical fiber has a plurality of bends arranged proximate the support structure. We report on abbs fiberoptic current and voltage transducers and their applications in highvoltage substations. Fiberoptic sensor for continuous monitoring of fermentation. A fiberoptic current sensor focs is a current sensor for measuring direct current. Leaflet giving a breif overlook about the current measurment system focs fibre optic current sensor integrated to the disconnecting circuit breaker dcb. Both plastic fiber optic cables and glass fiber optic cables can be connected to fiber optic cable sensors. Development of fiberoptic current sensing technique and. Fibers are also used in confined areas since many models can be bent to fit precisely where needed.
Fiberoptic current sensor for plasma current on experimental. A fiber optic sensor is a sensor that uses optical fiber either as the sensing element intrinsic sensors, or as a means of relaying signals from a remote sensor to the electronics that process the signals extrinsic sensors. The special characteristics of the sensors were achieved by use of the special low birefringence fiber as the faradayeffect sensing element and were also achieved with creation of sensing schemes. With product ranges available offering polarization maintaining, bendinsensitive, rareearth doped, claddingpump and photosensitive fibers. Pdf optical current sensors for high power systems. Abbs newly developed fiberoptic current sensor focs is a spin off from a sensor developed for highvoltage substations and opens totally new perspectives in the. Eric udd is president of columbia gorge research, a company he founded in 2005 to promote fiber optic sensor technology. Operation with highquality glass fiber optics for harsh industrial applications scale drawing wiring 3d pdf pdf data sheet to the selector fiberoptic amplifier. This type of sensor has been under development by the power indust ry for decades. Pdf the intrinsic advantages of optical sensor technology are very appealing for high voltage applications and can become a. Keep it simple dont use too many different parameters. To be distributed at fairs or other customer events.
By using the developed sensing devices, accurate current monitoring can be done easily by simply winding the flexible sensor fiber around the current. New dc current measurement technology with fiberoptic sensor. Originally developed for inflight lightning measurement, the sensor. Fiber optic sensors current status and future possibilities. Click download or read online button to get fiber optic sensors ii book now. A fiber optic current sensor for direct currents up to 500 ka is presented.
Three sensor systems were built with different sensitivities from different laser wavelengths. Introduction to fiber optic sensors and their types. Operating at 850nm, the first system uses twisted singlemode fiber and has a 150 a 150 ka range. We consider bulkoptics and allfiber current sensors and voltage sensors that exploit the electrooptic effect in bgo and the piezoelectric effect in quartz. Fiber optic current sensors, based on the faraday effect, are one of the best choices to measure the plasma current in a steadystate discharge. A fiberoptic current sensor for direct currents up to 500 ka is presented. Fiber optic current and voltage sensors for highvoltage substations. The principles of optical and optical fiber current sensor technology have been known for some considerable time, and. Pdf interferometric fiberoptic electric current sensor for. The second system operates at 1550nm, uses spun polarization maintaining fiber, and can measure 400 a 400 ka. Builtin amplifier photoelectric sensors pzg series.
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