Magneto optical current transformer technology provides a solution. Jena, germany magneto optical sensor technology offers entirely new perspectives in the field of magnetic measurement and testing. Optical fibre current sensor for electrical power engineering. By using a singleended optical fiber around the current conductor that utilizes the magnetooptic effect faraday. Silva 1, hugo martins 1,2, ivo nascimento 1,2, jose m. Magnetic current sensors are trans ducers based on magnetic field meas urement. A hall effect sensor is a device that is used to measure the magnitude of a magnetic field.
Fiber optic sensors, magnetooptical sensor, faraday rotation. The characteristics of magnetooptical sensors are their high resolution, ultimate precision, and small size 1. Magnetooptical current transformer technology moct. These sensors utilize optical fibres for connection to a separate sensing element.
Modelling of magnetic current sensors for measuring high. A new current transformer is described by means of new results concerning the domain wall excitation in orthoferrites. Other terms are optical current sensor and magnetooptical current sensor mocs. The application of magnetooptical current sensors mocs has become an important branch of current detection in recent decades. To measure currents power stations and substations conventionally employ inductive type current transformers with core and windings.
Design of magnetooptical traps for additive manufacture. Sep 03, 2008 fiberoptic sensors for sensing electrical current are attractive due to their inherent immunity to electromagnetic interference. Magnetooptical current transformermocttechnology provides a solution for many of the above mentioned problems. Bharati vidyapeeths college of engineering presented by shashank singhal 2. 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. Our highly sensitive magnetooptical sensors are the basis for the visualization of magnetic fields and are available in sizes up to 3 inches. Hall effect sensors are used for proximity sensing, positioning, speed detection, and current sensing applications. The output power is almost entirely provided by the measured signal without an excitation voltage. Optical current transformer oct linkedin slideshare. 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.
An accurate electric current transducer is a key component of any power system instrumentation. The concept of the optical sensors is the magnetooptical. 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. If the length of the sf2 glass rod d is small enough, the magnetic field. The development of semiconductors in the 1940s and 50s led to lowercost, compact and efficient light. 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 protection of relaying systems is a prominent task for optical current sensors.
Fiberoptic current sensors based on polarization coherence. Pdf on jan 11, 2016, shant arakelyan and others published direct current imaging using a magnetooptical sensor find, read and cite all. The sensor principle is the faraday rotation of a light beam through a magnetooptical material, sf2, when a magnetic field is. Optimization of optical current sensor based on rare. Fibre optic magnetic field sensing utilizing iron garnet. One of the remaining problems is the temperature dependence of the optical current measurement mainly caused by intrinsic or stress induced linear birefringence. The mo system is more sensitive than any of the current methods for detecting serial numbers, luyendijk said. Compared to the present diamagnetic glass used in the sensing element of optical current sensors ocss, the high. 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. Conventional current transformers becomes more and more bulky and costly. Osa analysis of antimagnetic interference properties and. In this paper we demonstrate the design of a lowcost optical current sensor.
Osa optical current sensor immune to reflection phase. Magnetooptical ac current sensing with an annealed fiber. Magnetooptical electriccurrent sensor with enhanced. A brief historical overview is given together with a more detailed focus on. Magneto optic current transformer optics free 30day. 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. Study of different magnetooptic materials for current sensing applications 429 tab le 6. The prototype has a high sensitivity and a high linearity for currents ranging from 0 up to 800 a. Also explore the seminar topics paper on magnetooptical current. Optical technology applicationsbegan in 1986 with combined efforts of tva and abb.
Magnetooptical sensors accurately analyze magnetic field distribution of magnetic materials marco koschny matesy gmbh jena, germany morris lindner innovent e. The concept of the optical sensors is the magneto optical principle. Pdf influence of magnetic field inhomogeneity on a. 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. The moct measures the electric current by means of faraday effect. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. Download the seminar report for magneto optic current.
Magnetooptical current sensors of high bandwidth request pdf. One of the remaining problems is the temperature dependence of the optical. Ppt moctmagneto optical current transformer powerpoint. Measurements of magnetoresistance in magnetooptical. 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.
In high voltage applications in a power electric system, mocs was. Mar 01, 2012 the principle of magneto optical sensors is the faradayeffect. Pdf direct current imaging using a magnetooptical sensor. 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. Require an external source of power excitation voltage that provides the majority of the output power of the signal 2 passive sensors. The sensor principle is the faraday rotation of a light beam through a magnetooptical material. Optical current sensors using the faraday effect promise significant advantages over conventional current transformers. This magneto optical current transducer eliminates many of the drawbacks of the conventional current transformers. Note than an optical current transducer appears to be a conventional current transformer operated uninsulated at. 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.
Technologies addressed include all fiber sensors, bulk magnetooptical sensors, piezoelectric transducers, magnetic force sensors and hybrid sensors. The principles of optical and optical fiber current sensor technology have. Introduction precise dc and ac current sensors are required by the automotive industry and by the chemical industry for. Design of magnetooptical traps for additive manufacture by. Introduction to sensors the national academies press. Pdf influence of magnetic field inhomogeneity on a magneto.
Apr 01, 2000 magneto optical current transformers mocts based on the faraday effect provide numerous advantages as compared with conventional measuring transformers. In these sensors, magnetooptical materials are the crucial components which interact directly. For instance, the temperature sensitivity of electrical. Design and development of a lowcost optical current sensor. Its output voltage is directly proportional to the magnetic field strength through it. Magnetooptical sensors bring obliterated serial numbers. Magnetooptical fiber sensor based on magnetic fluid. For decades, optical sensors have been finding their way into an increasing number of applications. Other terms are optical current sensor and magneto optical current sensor mocs. Effects in an optical medium that are dependent on the direction of light propagation. Conventional current measurement in highvoltage and highemi electromagnetic. Fibreoptic dc current sensor for the electrowinning industry english pdf. Magnetooptical sensors bring obliterated serial numbers back to life national institute of justice. Modelling of magnetic current sensors for measuring high ac.
Magnetooptical sensors accurately analyze magnetic field. Mar 14, 2014 conclusion a new type of current transducer is introduced known as magneto optical current transducer. Explore magnetooptical current transformer technology moct with free download of seminar report and ppt in pdf and doc format. The development of semiconductors in the 1940s and 50s led to lowercost, compact and efficient lightsensing devices. The concept of the optical sensors is the magnetooptical principle. Abstract this thesis deals with the subject of fibre optic magnetic field sensors utilizing iron garnet materials. It describes the rotation of the polarization plane of linearly polarized light passing the magneto optical sensor, which is exposed by a magnetic field, which is parallel to the direction of propagation of the applied light wave.
Influence of magnetic field inhomogeneity on a magneto. 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. 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. 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. A fiberoptic current sensor focs is a current sensor for measuring direct current. 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. The first class of these sensors comprises bulk magneto optical sensors section 5.
Abb fiberoptic current sensors focs for the measurement of high dc. 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. Introduction moctprinciple the magneto optical current transformer is based on the faradays effect. Introduction moctprinciple the magnetooptical current transformer is based on the faradays effect. Photodetectors were used in camera light meters, street lights and traffic counters. Magnetooptical magnetic field sensors based on compact. Abb fiberoptic current sensor focs for high dc currents. 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. Yansong li, jun wan, weiwei zhang, and jun liu, analysis of antimagnetic interference properties and structural optimization of magneto optical glass current sensors, appl. Based on the magnetooptic effect faraday effect in a singleended optical fiber around. 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. Our highly sensitive magneto optical sensors are the basis for the visualization of magnetic fields and are available in sizes up to 3 inches. 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. Applications for the sensors can be found in forensics and quality control of magnetic materials.
Pdf magneto optic current transformer technology moct. Several groups have shown the use of faraday rotation in magneto optical materials as a function of current induced magnetic field. 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. 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. Magneto optical sensors accurately analyze magnetic field distribution of magnetic materials marco koschny matesy gmbh jena, germany morris lindner innovent e. History has shown that advancements in materials science and engineering have been important drivers in the development of sensor technologies. Magnetoopticcurrenttransformer linkedin slideshare. Mocs employs the faraday effect of magneto optical material, such as diamagnetic flint glass or paramagnetic rareearth glass, as sensing principle. Magnetooptical current sensors of high bandwidth sciencedirect. 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.
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. This eliminates costly problems of potential separation. By applying faradays principle this transducer provides an easier and more accurate way of current measurements. To measure currents power stations and substations. The measured signal is transmitted by a light beam propagating in air or in optical fibers. Magnetooptical current transformer technology moct page link. The sensor principle is the faraday rotation of a light beam through a magneto optical material, sf2, when a magnetic field is present. Magnetooptical fibre sensors for electrical industry.
Pdf optical current sensors for high power systems. 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. Temperature dependence baffles the population of mocs in power system or some other areas. The sensor principle is the faraday rotation of a light beam through a magneto optical material. Such materials exhibit a large faraday rotation which make them advantageous for application in compact magnetic field sensors. Its output voltage is directly proportional to the magnetic field strength through it hall effect sensors are used. We present an analysis of allfibre sensors intended for current and magnetic field measurements in electrical systems. Magnetooptical current transformer technology moct seminar. Optical current transducers for electrical power systems. We study the effect of the inhomogeneity of the magnetic field induced by the current on the sensitivity of the optical fiber sensor topics.
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