This eliminates costly problems of potential separation. These sensors utilize optical fibres for connection to a separate sensing element. Require an external source of power excitation voltage that provides the majority of the output power of the signal 2 passive sensors. The concept of the optical sensors is the magnetooptical. However, the bulky apparatus, and current carrying coils, used so far in most mots restrict the reduction of power and physical size, as required for quantum technology applications. Magneto optical current transformer technology provides a solution.
Fiber optic sensors, magneto optical sensor, faraday rotation, lcc. The application of magnetooptical current sensors mocs has become an important branch of current detection in recent decades. Sensors 20, 587 where r is the distance from the wire axis, i is the electric current and 0 the permeability of free space 23. The characteristics of magnetooptical sensors are their high resolution, ultimate precision, and small size 1. Introduction moctprinciple the magnetooptical current transformer is based on the faradays effect. Modelling of magnetic current sensors for measuring high. Magneto optic current transducer consist of a sensor head located near the current carrying conductor, an electronic signal processing unit and fiber optical cables linking to these two parts. The magnetooptical sensor is based on the faraday rotation effect 2, which states that the polarization of light waves is rotated with the propagation of the light along or opposite to a magnetic field inside some material. Design of magnetooptical traps for additive manufacture by 3d printing yijia zhou,1,2 nathan welch, 1rosemary crawford, fedja oru cevi c,1,3 feiran wang,1 peter kruger, 1,3 ricky wildman, 4christopher. Fiber optic sensors, magnetooptical sensor, faraday rotation. This magneto optical current transducer eliminates many of the drawbacks of the conventional current transformers. Silva 1, hugo martins 1,2, ivo nascimento 1,2, jose m. 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. A new current transformer is described by means of new results concerning the domain wall excitation in orthoferrites.
Basis for moctinteraction between the magnetic field of the primary conductor and the optical activity of glass material magneto optical current transformer is an instrument transformer,using. A brief historical overview is given together with a more detailed focus on. Magnetooptical magnetic field sensors based on compact. Optimization of optical current sensor based on rare. We present an analysis of allfibre sensors intended for current and magnetic field measurements in electrical systems. Osa optical current sensor immune to reflection phase. Magnetooptical current sensors of high bandwidth sciencedirect. Also explore the seminar topics paper on magnetooptical current transformer technology moct with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year electronics and telecommunication engineering or. Pdf on jan 11, 2016, shant arakelyan and others published direct current imaging using a magnetooptical sensor find, read and cite all. An accurate electric current transducer is a key component of any power system instrumentation.
The idea of apply ing optical fibre sensors of the magnetic field with external transformations using new magnetooptical materials is a new approach to this. Measurements of magnetoresistance in magnetooptical. The moct measures the electric current by means of faraday effect. By using a singleended optical fiber around the current conductor that utilizes the magnetooptic effect faraday. Design and development of a lowcost optical current sensor. Introduction precise dc and ac current sensors are required by the automotive industry and by the chemical industry for. Note than an optical current transducer appears to be a conventional current transformer operated uninsulated at.
Introduction moctprinciple the magneto optical current transformer is based on the faradays effect. Osa analysis of antimagnetic interference properties and. Magneto optic current transformer optics free 30day. Bharati vidyapeeths college of engineering presented by shashank singhal 2. Design of magnetooptical traps for additive manufacture by. The principles of optical and optical fiber current sensor technology have. Mar 01, 2012 the principle of magneto optical sensors is the faradayeffect. Effects in an optical medium that are dependent on the direction of light propagation. Sep 03, 2008 fiberoptic sensors for sensing electrical current are attractive due to their inherent immunity to electromagnetic interference. Magnetooptical sensors accurately analyze magnetic field distribution of magnetic materials marco koschny matesy gmbh jena, germany morris lindner innovent e. We study the effect of the inhomogeneity of the magnetic field induced by the current on the sensitivity of the optical fiber sensor topics. Hall current sensor, current transformer, amr current sensor, current shunt, ammeter, rogowski coil, current comparator, cmos current sensor, magnetooptical current sensor, squid current sensor, gmi, current clamps some.
For instance, the temperature sensitivity of electrical. Technologies addressed include all fiber sensors, bulk magnetooptical sensors, piezoelectric transducers, magnetic force sensors and hybrid sensors. Magnetooptical fiber sensor based on magnetic fluid. Request pdf magnetooptical current sensors of high bandwidth a new current transformer is described by means of new results concerning the domain wall excitation in orthoferrites. We propose a new design of bulk glass optical current sensor immune to reflection phase shift, in which an annular gradedindex magnetooptical glass with a small prism is used as a sensing head, and the. Mar 14, 2014 conclusion a new type of current transducer is introduced known as magneto optical current transducer. One of the remaining problems is the temperature dependence of the optical. Osa optical current sensor immune to reflection phase shift. Jena, germany magneto optical sensor technology offers entirely new perspectives in the field of magnetic measurement and testing. Several groups have shown the use of faraday rotation in magneto optical materials as a function of current induced magnetic field. Based on the magnetooptic effect faraday effect in a singleended optical fiber around. The sensor principle is the faraday rotation of a light beam through a magnetooptical material. The magneto optical kerr effect is measured using a normally incident beam from a hene laser and a differential detection mod ule that monitors the.
In these sensors, magnetooptical materials are the crucial components which interact directly. Apr 01, 2000 magneto optical current transformers mocts based on the faraday effect provide numerous advantages as compared with conventional measuring transformers. Fibre optic magnetic field sensing utilizing iron garnet. Yansong li, jun wan, weiwei zhang, and jun liu, analysis of antimagnetic interference properties and structural optimization of magneto optical glass current sensors, appl. The development of semiconductors in the 1940s and 50s led to lowercost, compact and efficient lightsensing devices. Such materials exhibit a large faraday rotation which make them advantageous for application in compact magnetic field sensors.
Magneto optic current transformer, ask latest information, magneto optic current transformer abstract,magneto optic current transformer report,magneto optic current transformer presentation pdf,doc,ppt,magneto optic current transformer technology discussion,magneto optic current transformer paper presentation details,magneto optic current transformer, ppt, pdf. Fibreoptic dc current sensor for the electrowinning industry english pdf. Acdc current sensors are the resis tive shunts and the magnetic current sensors that include halleffect cur rent sensors, magnetoresistive current sensors, symmetry detector current sensors and optical current sensors. Optical current sensors with mainly optical fibers do not suffer from electromagnetic interference, has lightweight and small size, and possess a low suscepti bility to environmental influences 1. To measure currents power stations and substations. Optical current sensors with mainly optical fibers do not suffer from electromagnetic interference, has lightweight and small size, and possess a low susceptibility to environmental influences 1. Also explore the seminar topics paper on magnetooptical current.
In high voltage applications in a power electric system, mocs was. A hall effect sensor is a device that is used to measure the magnitude of a magnetic field. The development of semiconductors in the 1940s and 50s led to lowercost, compact and efficient light. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience. The sensor principle is the faraday rotation of a light beam through a magneto optical material, sf2, when a magnetic field is present.
Design of magnetooptical traps for additive manufacture. Influence of magnetic field inhomogeneity on a magneto. History has shown that advancements in materials science and engineering have been important drivers in the development of sensor technologies. If the length of the sf2 glass rod d is small enough, the magnetic field.
Fiberoptic current sensors based on polarization coherence. Hall effect sensors are used for proximity sensing, positioning, speed detection, and current sensing applications. To measure currents power stations and substations conventionally employ inductive type current transformers with core and windings. Magnetooptical sensors bring obliterated serial numbers back to life national institute of justice. The sensor principle is the faraday rotation of a light beam through a magneto optical material. Photodetectors were used in camera light meters, street lights and traffic counters. Other terms are optical current sensor and magneto optical current sensor mocs. The prototype has a high sensitivity and a high linearity for currents ranging from 0 up to 800 a. Optical current transformer oct linkedin slideshare.
Magnetooptical current sensors of high bandwidth request pdf. The mo system is more sensitive than any of the current methods for detecting serial numbers, luyendijk said. Optical current sensors ocss show several important features when compared with conventional current transformers cts, such as their having highly effective isolation from high line potentials. Yansong li, jun wan, weiwei zhang, and jun liu, analysis of antimagnetic interference properties and structural optimization of magnetooptical glass current sensors, appl. Its output voltage is directly proportional to the magnetic field strength through it hall effect sensors are used. A fiberoptic current sensor focs is a current sensor for measuring direct current. The output power is almost entirely provided by the measured signal without an excitation voltage. Conventional current measurement in highvoltage and highemi electromagnetic. Magnetooptical ac current sensing with an annealed fiber.
By applying faradays principle this transducer provides an easier and more accurate way of current measurements. Study of different magnetooptic materials for current sensing applications 429 tab le 6. Abstract this thesis deals with the subject of fibre optic magnetic field sensors utilizing iron garnet materials. The protection of relaying systems is a prominent task for optical current sensors. Magnetoopticcurrenttransformer linkedin slideshare. Optical current sensors ocss based on the faraday effect.
Explore magnetooptical current transformer technology moct with free download of seminar report and ppt in pdf and doc format. Download the seminar report for magneto optic current. One of the remaining problems is the temperature dependence of the optical current measurement mainly caused by intrinsic or stress induced linear birefringence. Magnetooptical sensors accurately analyze magnetic field. Pdf influence of magnetic field inhomogeneity on a. Its output voltage is directly proportional to the magnetic field strength through it. Optical current sensors ocss show several important features when compared with conventional current transformers cts, such as their having highly effective isolation from high line potentials offered by the dielectric nature of the optical fibers, freedom from the saturation effect which may be observed in conventional transformers, the. Magnetooptical current transformer technology moct posted by. Conventional current transformers becomes more and more bulky and costly. Introduction to sensors the national academies press. For decades, optical sensors have been finding their way into an increasing number of applications. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects.
A system for estimating a parameter selected from the group consisting of a current, a magnetic field, or combinations thereof comprises a resonant frequency tunable magneto optical loop resonator, wherein the loop resonator comprises a magneto optical sensing element coupled to an optical waveguide, and wherein the loop resonator is configured for receiving an originating optical signal from. In this paper we demonstrate the design of a lowcost optical current sensor. Optical fibre current sensor for electrical power engineering. The first class of these sensors comprises bulk magneto optical sensors section 5. The concept of the optical sensors is the magnetooptical principle. Pdf direct current imaging using a magnetooptical sensor. Our highly sensitive magneto optical sensors are the basis for the visualization of magnetic fields and are available in sizes up to 3 inches. Magnetooptical fibre sensors for electrical industry. Abb fiberoptic current sensors focs for the measurement of high dc.
Pdf optical current sensors for high power systems. Ppt moctmagneto optical current transformer powerpoint. Magnetooptical current transformermocttechnology provides a solution for many of the above mentioned problems. Our highly sensitive magnetooptical sensors are the basis for the visualization of magnetic fields and are available in sizes up to 3 inches. Magneto optical sensors accurately analyze magnetic field distribution of magnetic materials marco koschny matesy gmbh jena, germany morris lindner innovent e. The sensor principle is the faraday rotation of a light beam through a magnetooptical material, sf2, when a magnetic field is.
Applications for the sensors can be found in forensics and quality control of magnetic materials. The measured signal is transmitted by a light beam propagating in air or in optical fibers. Magnetooptical electriccurrent sensor with enhanced. Magnetic current sensors are trans ducers based on magnetic field meas urement. Temperature dependence baffles the population of mocs in power system or some other areas. Mocs employs the faraday effect of magneto optical material, such as diamagnetic flint glass or paramagnetic rareearth glass, as sensing principle. Magnetooptical current transformer technology moct seminar. We propose a new design of bulk glass optical current sensor immune to reflection phase shift, in which an annular gradedindex magneto optical glass with a small prism is used as a sensing head, and the inner and outer layers of the glass possess gradient refractive indices, while the center layer is uniform. Optical current sensors using the faraday effect promise significant advantages over conventional current transformers. Other terms are optical current sensor and magnetooptical current sensor mocs. Abb fiberoptic current sensor focs for high dc currents. Optical technology applicationsbegan in 1986 with combined efforts of tva and abb. Compared to the present diamagnetic glass used in the sensing element of optical current sensors ocss, the high. Pdf influence of magnetic field inhomogeneity on a magneto.
Magnetooptical sensors bring obliterated serial numbers back. Influence of magnetic field inhomogeneity on a magnetooptical current sensor article pdf available in journal of sensor technology 0201 january 2012 with 112 reads how we measure reads. Magnetooptical current transformer technology moct page link. Note than an optical current transducer appears to be a conventional current transformer operated uninsulated at high voltage, and both reporting via, and powered by, an optical fiber. The concept of the optical sensors is the magneto optical principle. Pdf magneto optic current transformer technology moct.
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