New robust eddy current controller is designed for use with miniature eddy current sensor range. These advantages have made eddycurrent sensors indispensable for many machine builders, production managers, or precision metrology applications. They are particularly suitable when high precision is required in harsh industrial environments pressure, dirt, temperature. Eddy current sensors for displacement, distance and position. Bestech offers eddy current displacement sensors throughout australia that enhances productivity, safety and quality. Eddy current sensors for displacement, distance and position noncontact eddy current sensors or inductive measurement systems also kown as oszillation sensors, flatness sensor, position sensor, dislocation sensor, displacement sensor, distance sensor, small miniature sensors for measurement in motors, heavy industry. Eddy current displacement sensor australia bestech australia. Optimum design and application research of eddy current sensor. Pdf eddycurrent displacement transducer with extended linear. Displacement velocity acceleration these parameters can be. Eddycurrent sensors provide high precision and are robust to a. The eddy current type displacement sensors measure the distance based on the change of the. Machinery ealth sensors eddy current sensors require converters to power them and to convert their output to the correct scaled voltage data per displacement unit, typically mvmicron or mvmil. Capacitive and eddycurrent sensors ecss are preferred when the absolute position of a target has to be measured with a limited dynamic range.
Eddy current displacement, distance and position sensors. The temperature coefficient of this selfcompensation ecs is only about 2. Non contact eddy current sensors measure displacement, distance and position of any. Eddycurrent displacement sensors use a magnetic field that engulfs the end of the probe. Noncontact displacement and position sensors eddy current displacement sensors measure distances, displacements, or positions of any electricallyconductive target. View pdf catalogues and other online documentation. Pdf a novel interface for eddy current displacement sensors. Find your eddy current displacement sensor easily amongst the 18 products from the leading brands micro epsilon, panasonic. Learn why eddycurrent sensors are now replacing inductive. The speed of a rotor or rotors of a turbine engine is important information on its operation. Sensors laser markers plc interfaces corresponding to each material stainless steel, systems the controller enabling the easy selection of the systems guide displacement displacement displacement ultra high sampling speed controller gpx gpa high speed high accuracy eddy current type digital displacement sensor gpx series highspeed sampling. Eddy current sensors from microepsilon are designed for noncontact measurement of displacement, distance, position, oscillation and vibrations. Eddy current sensors advantages,disadvantages and application eddy current sensors detect the proximity or presence magnetic fields generated by a reference coil. Ultrastable and highly sensitive eddy current displacement sensor using selftemperature compensation.
A displacement sensor displacement gauge is used to measure travel range between where an object is and a reference position. We are specialists in the fields of lvdt displacement sensors up to mm displacement and eddy current sensors up to 50 mm displacement, as well as measuring amplifiers and sensors in the field of displacementposition measuring technology. The eddy current method utilises highfrequency magnetic fields. Inductive sensors from microepsilon are based on the eddy current principle and designed for noncontact measurement of displacement, distance, position, oscillation and vibrations. To overcome these limitations, a certain class of inductive displacement sensors, called eddycurrent sensors have been developed which does not use a ferrite core but instead use an aircore coil. This paper reports the principle of displacement eddy current sensors and highlights the advantages compared with other noncontact sensors. As a result, the spotsize of eddycurrent displacement sensors is about 300% of the probe diameter. Performance 5mm sensor linear measurement range 1 mm 40 mils initial air gap 0. A selftemperature compensation method for eddy current displacement sensor is proposed.
Linear position and displacement with capacitive and eddy. Looking for eddycurrent testing and displacement sensors. High accuracy eddy current type displacement sensor. What are displacement sensors displacement gauges and. This changes the impedance of the coil within the sensor head. Low cost eddy current sensor with integrated electronics.
Eddycurrent displacement transducer with extended linear. There are many factors to consider when choosing between capacitive and eddycurrent displacement sensors. A novel interface for eddy current displacement sensors. Pdf design details and measurement results of the eddycurrent displacement transducer with extended linear range and automatic tuning are presented. If a measurement target metallic is inserted into this magnetic field. Eddy current type displacement sensor displacement. High accuracy eddy current type displacement sensor gpa. Inductive sensors from microepsilons eddyncdt family are ideal for all noncontact measurements of displacement, position, distance, vibrations, and oscillation especially where oil, pressure, dirt, and high temperatures are present. Any application that involves measurement area contaminants such as liquids or waste material requires eddycurrent sensing. Pdf this paper proposes a method of selftemperature compensation for eddy current sensors ecss during rapid temperature changes. The eddy current displacement sensor ecds is widely used in the magnetic suspension flywheel msfw to measure the tiny clearance between the rotor and the magnetic bearings.
Inductive displacement sensors and eddy current sensors are used in many sectors. If there is a measurement object metal within this magnetic field, then excess current is produced around the magnetic flux that passes through the object surface due to the. Eddy current sensor systems from microepsilon are designed for high performance noncontact measurement in harsh environments. Eddy current sensors pdf, 255 kb eddy current sensors pdf, 586 kb sensors for any. A simple ac bridge is designed to separate the resistive and inductive part of the coil. Sensors inductive proximity sensors particular sensor options simple wiresaving units systems measurement sensors laser markers plc interfaces systems systems guide displacement displacement operability displacement fine adjustment of output fine adjustment according to the sensing conditions is controller gpx. For the application of interest here, ec sensors have many advantages. The eddy current method utilizes highfrequency magnetic fields. Eddycurrent displacement sensing various noncontact direct displacement sensing techniques exist. New ip69k drawwire displacement sensors can be customised to suit a range of high volume oem industrial applications. These differ from proximity and inductive displacement sensors in that they use an aircore coil instead of a ferromagnetic core.
Ultrastable and highly sensitive eddy current displacement sensor using self temperature compensation. The linear range of the ecds is determined by the diameter of its probe coil. A wide linear range eddy current displacement sensor. Lvdt displacement sensors and eddy current sensors messotron. Displacement sensors can be used for dimension measurement to determine an objects height, thickness, and width in addition to travel range. Noncontact, nanometer resolution, highspeed applications are what we thrive on.
Eddy currents are formed when a moving or changing magnetic field intersects a conductor or vice versa. Whether measuring displacement, position, gap or vibration, microepsilon has a huge range of sensor and controller options to solve your task. In this paper, we propose a novel interface concept for eddy current displacement sensors. Pdf ultrastable eddy current displacement sensor working in. The relative motion causes a circulating flow of electrons, or currents, within the conductor. Displacement sensors eddy current datasheet, cross reference, circuit and application notes in pdf format. The principle enables noncontact and wear free measurements.
The electrical model of the sensor can be simplified to an equivalent. Types of measurements systems eddy current displacement sensors eddy current method. Inductive displacement sensors and eddy current sensors. We have listed a few typical applications for our products below. Pdf ultrastable and highly sensitive eddy current displacement. For the application of interest here, ec sens ors have many advantages. Eddy current sensors for displacement, distance and position noncontact eddy current sensors or inductive measurement systems also kown as oszillation sensors, flatness sensor, position sensor, dislocation. This eliminates the magnetic losses and thermal nonlinearities associated with ferromagnetic cores, and it also gives eddycurrent sensors much faster response times to resolve fastmoving targets, up to the mhz range. The force caused by vibration or a change in motion acceleration. The brand site of shinkawa electric for its inhouseproducts, including sensors and cms condition monitoring system for rotating machinery. Aluminium is commonly used as target for eddy current sensors and has a calculated penetration depth of 58.
An eddy current sensor with its cable and converter all together form a chain. The variety of quantities that can be measured make displacement sensors one of the extensively most employed sensors in industry. The difference between inductive proximity, displacement. Due to the specific conditions, in which the measurement is taken in a turbine engine, which in particular applies to small engines that are becoming increasingly popular in manned and unmanned aviation, the most universal detector is the detector using the phenomenon of eddy. The measurement objects may have either ferromagnetic or nonferromagnetic properties.
These combined phenomena of induction, eddy current generation, and opposition are the fundamental principles of proximity, inductive. Understanding the true meaning of precision noncontact position and displacement measuring systems. Eddy current type displacement sensor displacement sensors. This page introduces noncontact, eddycurrent displacement sensors that can be used for various applications. However, often you cannot find an ideallysuited standard product for your application. Ding 14 detected surface displacement by eddy current sensor. Com an accelerometer is a device that measures the vibration, or acceleration of motion of a structure. Eddy current displacement sensors measurement library. Heinrich lenz contributed by adding that the direction of the induced emf always opposes the change that induced it. They can be used as proximity sensors of a target by sensing the sensors detect ferrous and to detect the presence of gauges target or it can be. Eddy current sensors uses the principle of eddy current formation to sense displacement. The eddy current type displacement sensors produce a highfrequency magnetic field by applying a highfrequency current to the coil inside the sensor head.
Ultrastable and highly sensitive eddy current displacement. Capacitive displacement sensors share many similarities to eddy current or inductive displacement sensors. At present, the main method of tbm cutter wear detection is manual. Eddy current sensor noncontact sensor designed for critical turbomachinery applications such as steam, gas and hydro turbines, compressors, gearboxes, pumps and fans to measure radial and axial shaft dynamic displacement. The eddy current sensor ecs has subnanometer resolution. Eddy current ec displacementsensors are used in adevice for measuringtheshaft vibration of turbines.