We have the most extensive experience, and we develop the highest quality ect inspection products. Because of the large variations in probe performance 1, a specification is needed to ensure that probes meet minimum performance criteria. For an air core probe he found that the decrease of eddy current density strongly depends on the probe diameter. Ectane 2 e, ectane 2 e64, ectane 2 e128, ectane 2 e256, ectane 2 i, ectane 2 ernm, ectane 2 ernmi, ectane 2 e64rnm, ectane 2. The method includes calibrating the eddy current array probe, collecting data from the eddy current array probe for analysis, and processing the collected data to at least one of compensate for response variations due to a detected orientation of a detected imperfection and to facilitate minimizing noise. Singlecoil, absolute eddy current probes are used extensively by the air force for inspection of aluminum airframe structures.
Eddy current techniques in ndeeddy current techniques in nde. Furthermore eddy current sensors are perfectly suited for the observation of dynamic events. We offer a wide range of standard eddy current probes and coils for a complete range of eddy current instruments. The type of testing performed, using comprehensive throughtype coils or rotating probes, depends on the type of defect. The output sensitivity of conventional eddy current probe systems typically falls off as temperature increases. However, the eddy current testing technique still needs to focus on the details of probe structure and its application. The technique involves a transmissionreception probe to produce an output. This app is an ideal onsite tool for inspection professionals who need to.
Linear position and displacement with capacitive and eddy. Following the model of dodd and deeds 1 mottl calculated the decrease of eddy current density analytically 2. Separation between the coil and the specimen surface impedance of the coil changes as the probe is moved from air till it touches the material surface liftoff curve minimized by the use of surfaceriding probes or multifrequency. The eddy current probe consists of a precisionwound copper coil inside a chemical and temperatureresistant peek tip. Us20100312494a1 process and apparatus for testing a. Typically, the instruments are designed for manual handling of a singe coil sensor or array probe with wheel tracker. Eddy currents are created through a process called electromagnetic induction. A complete line of eddy current probes to choose from. Download eddy current probe selection guide and enjoy it on your iphone, ipad, and ipod touch.
The cmss 785 system is an eddy current type noncontact displacementvibration system, used for measuring shaft vibration, axial position, rotating speed and phase from small rotating machinery to large. Eddy current probe selection guide for ios free download. In fact, one of the major advantages of eddy current inspection is that probes can be custom designed for a wide variety of applications. Changes in humidity have no effect on eddycurrent displacement measurements. Noncontact, nanometer resolution, highspeed applications are what we thrive on. Eddy current probes are classified by the configuration and mode of operation of the test coils. We can also design probe kits to meet your inspection needs and budget requirements. Dynamic rotating rigid probe with stainless steel housing for bolt holes testing coils are positioned at right angles to the probe shaft length, differential unshielded shielded details eddy current probes read more. A number of embodiments of inventive eddy current probes for nondestructive inspection of electrically conductive tubes are described. This is the basis of eddy current testing, by monitoring the voltage across the coil in such an arrangement we can detect changes in the material of interest. This catalogue features the standard range of ge eddy current probes and accessories.
Eddy current instruments are available in many configurations by different commercial suppliers. View and download eddyfi ectane 2 user manual online. All the eddy current ect probes from ether nde are manufactured inhouse. It is used to inspect straight nonferrous tubes located in large power plant condensers and in smaller heat exchanger feed water heaters. Eddycurrent sensors have some sensitivity to temperature, but the systems are compensated for temperature changes between 15c and 65c with a drift of less than 0. Eddycurrent probe cabling considerations lion precision. Olympus offers more than 10,000 standard and customdesigned eddy current probes, standard references, and accessories. After downloading the eddyvision zip file, follow the installation directions in readme. Eddy current probes eddy current cables pencil probes. This section gives a short description on how to build a probe part number. Modeling an eddycurrent probe for damage detection of surface.
The signal from an eddy current probe includes a collection of responses from defects, sample geometry and probe liftoff. In these pages, we have included useful information to help you make the ri. We are ready to help you find the exact probe you need to get the job done. This is mounted on a threaded stainless steel rod for easy gap adjustment or a flat, lowprofile mount. A more detailed analysis 4 shows that the secondorder lift off is orthogonal to the firstorder liftoff and, therefore, has a component in the signal channel. Eddy current ndt probes from ether nde, view our extensive range of standard probes, weld probes, special probe design services and a wide choice of probe accessories available in the uk and worldwide.
Olympus manufactures high quality cables and adaptors to fit with all eddy current probe models. A highfrequency rf signal is generated by the driver, sent through the extension and probe cables and radiated from the probe tip. This version restores the ability to do mixes and filters while acquiring data. At ether nde we design and manufacturer all our eddy current ect probes in house and with the ability to design your probes to the exact nondestructive testing ndt application you have, even the simple pencil probe becomes specific to you. Actually, eddy current probes are far from providing a plane magnetic field. Eddy current sensors provide high resolution measurement for even the dirtiest environments.
For this purpose, the test item is rotated by a specially adapted mechanism and then scanned by a stationary probe. Eddy current probe selection information olympus ims. In a bench test experiment using a 1 4 vacuum vessel. Factors affecting eddy current measurements factors affecting eddy current transducers liftoff. Eddy current testing is a nondestructive method for testing metal surfaces for defects such as longitudinal and transverse cracks. Electronic system for nondestructive testing using eddy. An introduction to eddy current testing theory and technology joseph m. Damage detection of surface cracks in metallic parts by pulsed eddy. Pdf the eddy current probe array for keda torus experiment. Its size allows inspections to be performed in confined space and. For eddy current imaging an easy to handle sensor array is provided. Eddycurrent sensors provide high resolution measurement for even the dirtiest environments. Techna ndts miscellaneous eddy current probes include spring loaded, blade, wheel, defectometer hole, and defectometer surface probes.
Each eddy current probe available from ndts has a unique code. Installation of eddy current sensors on gearbox main and auxiliary shafts behind bearing shield. In this technique, a coil also called probe or sensor is excited with sinusoidal alternating current frequency, f, 50 hz5. Corrosion detection and measurement using eddy current methods. Challenges in improving the performance of eddy current testing. In assessing the et inspection technique, pnnl used a range of specimens from four different sources. A coil of fine wire conducting a highfrequency alternating current above 1 mhz is used to set up an alternating magnetic field at the surface of the instruments probe. With this premise the eddy current sensor is suitable for general motion analysis and in automotive applications. These advantages have made eddy current sensors indispensable for many machine builders, production managers, or precision metrology applications. Eddy current probe system api670 proximity transducer system, 5 mm and 8 mm.
These cables are more susceptible to leakage and may have a more limited life expectancy in applications within liquid sprays or applications requiring immersion of the probe. Recommended practice for eddy current examinationn. Note that cracks must interrupt the surface eddy current flow to be detected. Instruction manual eddy current flaw detector pce instruments. The eddy current probe selection guide is designed to help you easily identify the best probe size and test frequency for a given eddy current tube inspection application. If you cannot find a probe or accessory to meet your inspection requirements, please contact your local. Our extensive product portfolio is designed to improve your processes through every stage of your manufacturing cycle from design and installation through operation and maintenance. High quality eddy current testing solutions for complete inspections. Challenges in improving the performance of eddy current. Dymac ryton based eddy current probes were designed using a unique temperature chamber to test the probes over the wide temperature range required by api. Zetec eddy current surface array probes are specifically designed to solve the inspection challenges companies face everyday. The selection of the right eddy current probe is of great importance in the success of your inspection.
These advantages have made eddycurrent sensors indispensable for many machine builders, production managers, or precision metrology applications. Proximity sensors work on the eddy current principle. Manual hole probes include swivel collars with triax and microdot connectors, adjustable diameters, and countersinks with triax and microdot connectors. The improvement of flaw detection by the configuration of uniform eddy current probes. General surface probes, aerospace probes, dedicated inspection probes and accessories. However, the eddy current testing technique still needs to focus on t. Ectane 2 measuring instruments pdf manual download. Download et probe catalog about okondt group okondt group represents a group of companies with more than 25year experience in research, development and manufacture of ndt products for industrial clients all over the world, who endeavor to ensure highlevel operational safety, quality, and reliability. It has been designed to make the inspection of fastener holes accurate and quick. Assessment of eddy current testing for the detection of. Design and analysis of a gmr eddy current probe for ndt. The analysis for this case study is based on the eda approach discussed in an earlier section.
Eddy current sensors of the txseries stand out with an excellent dynamic range 100 ksas and resolutions in the submicron range. Eddy current probe catalog introduction 6 every section in this probe catalog begins with a short description of the different eddy current products available. Eddy current probe selection guide on the app store. To view additional table columns, slide right side of table to the left.
Eddy current ndt probes, uk eddy current testing, eddy. Table 5 description of single coil parametric eddy current probe. General purpose eddy current probe for detection of surface and near surface defects around protruding head fasteners and other structures in aircraft structures030. Buckley, formerly of hocking ndt introduction scope this document is intended as a brief familiarisation course for hocking ndts customers and sales representatives. Their nondestructive testing ndt eddy current probes and accessories were designed with a vast array of options in frequency, length, diameter, and more to ensure that the probe you choose is the probe that gets the job done, whether its on site or in the field. These include a bearingcentered probe, a spring loaded wheelcentered probe, a multipart probe for curved tube inspection having limited excursion ball joints connecting the probe parts, and a 3d printed probe including features that are incapable of being. Reference standards should be used in every application and are available in many configurations and materials. Spc371r1afe spring loaded probe spc629 spc4161 spc624diffinc spc623diffinc spc621 flangetube well spc620mtl. It is not intended as a complete theoretical course in eddy. Principle ec testing works on the principles of electromagnetic induction. The company facilitates customization of the probes to match the exact nondestructive testing ndt application such that even a basic pencil probe becomes specific to the customer. The eddy current sensor must resist hardest conditions. In this technique, a coil also called probe or sensor is excited with sinusoidal alternating current frequency, f, 50 hz5 mhz, 100 ma. In addition, we can also offer custom id tubing probes, cables and adapters, reference blocks and other various accessories, such as shippingstoragecarrying cases.
Pdf eddy current technique is an important electromagnetic nondestructive evaluation technique that is widely used in. The system based on the ecscan architecture makes use of a new probe excitation block capable of simultaneously. Analysis of a 2 3 full factorial design this case study demonstrates the analysis of a 2 3 full factorial design. Eddy current sensors are utilised at high temperatures and high pressure, within oil or coolant and in strong electromagnetic fields and various combinations.
Eddy current probe differential eddy current technology. The test method can be optimally integrated in the production process. Any discontinuities or material property variations that change the eddy. Eddy current testing is one of the most extensively used nondestructive. The eddy current probes are fixed in the probe mountings with a clamping pin for axial displacement and adjustment of the spacing. The aim of this project is to develop an electronic system that makes use of multiplexing techniques applied to eddy current nondestructive testing while using a new probe array.
The main purpose of this paper is to construct an eddy current probe by using transmission coil and using a giant. Eddy current probes ndt and inspection product and. Surface crack detection in metallic parts was considered through modeling the eddycurrent pattern induced by a variable magnetic field. Eddy current techniques are used to nondestructively measure the thickness of nonconductive coatings on nonferrous metal substrates. Dynamic rotating rigid probe with stainless steel housing for bolt holes testing coils are positioned at right angles to the probe shaft length, differential unshielded. A method for testing a component using an eddy current array probe is provided. Eddy current probes are available in a large variety of shapes and sizes. Eddy current application eddy current is a noncontact method used to inspect nonferromagnetic tubing. Eddy current technique is an important electromagnetic nondestructive evaluation technique that is widely used in power, aerospace, petrochemical and other industries for detection of surface. Rotating plastic scanner probes rotating plastic scanner probes feature a variety of expandable plastictip probes and stainlesssteel. In this technique, the probe is excited with an alternating current, inducing eddy currents in the part under inspection. Eddy current probes can be designed to match the contours of a part or shaped to fit into a fixture for fast and accurate inspections.
Pdf design and analysis of a gmr eddy current probe for ndt. Eddycurrent probe design 175 channel if the detection channel is not perfectly orthogonal to the liftoff. Eddy current testing manual on eddy current method. Zetec is the industry leader for costeffective eddy current testing ect in complex applications. An introduction to eddy current testing joe buckley. Eddy currents are curls of electrical current induced in conductors by a changing. Differential cover with installed eddy current probes. The ge mini drive unit is a small, lightweight, rotating eddy current probe drive and is used in conjunction with the probes on page 8. A proximity system consists of an eddy current probe, extension cable and driver. A unique probe winding technique was developed by dymac. If there is a special probe you are looking for you will find it at ndt solutions, llc. This magnetic field expands as the alternating current rises to max. Highfrequency eddy current an overview sciencedirect topics.
Cmss 78 eddy current probe part number cmss 78 ab2 ccddee a armour l standard without armour a armoured b2 thread size m2 iso m10x1 ee cable length l 3 u2 unf 3824 05 0. Pnnl 1 studied advanced eddy current probe configurations that provide sensitivity to both axially and circumferentially oriented, nearsurface flaws and 2 investigated the reliability and effectiveness of an id inspection technique. Eddy current testing plays an important role in numerous industries, particularly in material coating, nuclear and oil and gas. Penetration for a typical singlecoil eddy current testing probe 3. Fep by its nature only provides limited adhesion for adhesives used to seal the probecable interface. From detecting extremely small defects to inspecting nonflat surfaces and covering a wide area in a single pass. Ic series eddy current probes lowcost sensor with integrated electronics lowcost series with integrated analog electronics measurement ranges up to 8 mm output signals 020 ma, 420 ma, 010 v threaded housings m12, m18 and rectangular version linearity up to 60. Adequate assessment of flaws or any other surface properties is likely when other factors are understood. The eddy current differential probe is the work horse of the industry. Miscellaneous probes eddy current probes techna ndt.
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