We offer a wide range of standard eddy current probes and coils for a complete range of eddy current instruments. Compared to singlechannel eddy current technology, eddy current array technology provides the following benefits. At ecndt, our vision is providing technically superior products for all of our customers at competitive pricing. It has been designed to make the inspection of fastener holes accurate and quick. This chapter describes how to install a 1442 series eddy current probe system. This section gives a short description on how to build a probe part number. A wide variety of eddy current probes options are available to you, such as auto testing machine. Introduction eddy current inspection is one of several methods that use the principal of electromagnetism as the basis for conducting examinations.
An eddy probe system comprises a probe, a driver oscillator demodulator, and an extension cable. These are normally fitted with a triax detachable connector but can be fitted. Modelling and simulation of target temperature effect on eddy. Optimization criterion the optimization criterion is to maximize the figures of merit s and d, given by auld 1. Corrosion detection and measurement using eddy current methods. In addition, we can also offer custom id tubing probes, cables and adapters, reference blocks and other various accessories, such as shippingstoragecarrying cases. Success of eddy current testing for a specific inspection applcation depends on sensor, instrument and optimisation of test parameters. Eddy current techniques in ndeeddy current techniques in nde.
Array nuclear sg edf probes a combination x probe sax smx probe was created for the french market. Eddy current probes are available in a large variety of shapes and sizes. A special aircore eddy current reflection probe was fabricated at the national institute of standards and technology nist and used to obtain flaw signals for a number of rectangularshaped. Ecndt is pleased to be a leader in the world market of nondestructive testing.
Pancaketype probes can be used in either manual or automatic eddy current testing. It is used to inspect straight nonferrous tubes located in large power plant condensers and in smaller heat exchanger feed water heaters. Probes configurations as mentioned on the previous page, eddy current probes are classified by the configuration and mode of operation of the test coils. Pdf in this present study, a new uniform eddy current uec probe with a doubleexcitation coil and pancake orientation is proposed. Pulsed eddy current testing pect inspection technique innospection limited unit 1, howemoss avenue, kirkhill industrial estate, dyce, ab21 0gp, aberdeen, united kingdom. Different materials can be exchanged easily in a quick release socket. 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. Share information on mathematical modelling of eddy current probes. Eddy currents, to put in simpler terms, are fields of alternating magnetic current that are produced when an alternating electric current travels via one or more coils in a probe assembly. All brands are trademarks or registered trademarks of their respective owners and third party entities. Eddy current techniques in ndeeddy current techniques in nde lalita udpa nondestructive evaluation laboratory department of electrical and computer engineering miccg s euvesyhigan state university east lansing, mi 48824 wcndt p f w k h d b a il 15 2012wcndt preconference workshop, durban, april 15, 2012. Inductive sensors eddy current for displacement, distance.
Its size allows inspections to be performed in confined space and. In fact, one of the major advantages of eddy current inspection is that probes can be custom designed for a wide variety of applications. In mountain areas where continuous braking force is needed, for a long time, the eddy current braking. Optimal performance in your eddy current test is insured by selecting the right type of probe and one that is meticulously made. The configuration of the probe generally refers to the way the coil or coils are packaged to best couple to the test area of interest. About the company staveley instruments is a us manufacturing company based in kennewick, washington producing a wide range of innovative ndt equipment and sensors. Some analytic solutions to maxwells electromagnetic equations for determining characteristics of eddy current probe coil configurations were derived years ago by caius v.
Plus significantly reduce dose and radiation waste. An alternate magnetic field is produced by a solenoid and eddy currents are generated in the material under test. 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 inspection procedures and specification 2014 page 3 of 4 9.
Computer based eddy current test instrument manufactured by highline automation. Multifrequency techniques are usually accomplished by combining. Low frequency probes eddy current probes techna ndt. Reduces the complexity of mechanical and robotic scanning systems. The probes induce a magnetic field in conductive materials and measure changes that occur in that field changes that could be caused by cracks or degradation of the pipeline material. Note that the bridge actually measures 6z fz and 6zt iz. Eddy current application eddy current is a noncontact method used to inspect nonferromagnetic tubing. This work describes the design, construction and characterisation of eddy current sensors with rectangular planar spiral coils. Eddy current sensors with rectangular planar coils were designed, constructed and characterized.
Eddy current probe is the main link between the eddy current instrument and the component under test. They can be used to find generic subsurface defects. Technologies based on eddy current ec flexible array probe and magnetic sensor with high sensitivity such as giant magneto. 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. Ring bridgedifferential probes have the same characteristics as their spot probe counterparts but are useful for inspections around fasteners. Any discontinuities or material property variations that change the eddy current flow in the part are detected as. Pdf eddy current flexible probes for complex geometries. Eddy current testing also commonly seen as eddy current testing and ect is one of many electromagnetic testing methods used in nondestructive testing ndt making use of electromagnetic induction to detect and characterize surface and subsurface flaws in conductive materials. Nondestructive techniques based on eddy current testing mdpi. Eddy current studies were conducted on the innerdiameter surface of piping using a zetec miz27si eddy current instrument and a zetec c z00008571 pluspoint spot probe with an operating frequency of. Olympus manufactures rd tech eca probes for a wide range of applications.
To predict and evaluate the eddy current system response with regards to flaw detection in the inconel sheet to identify the most suitable probe parameters for flaw detection in a 0. Corrosion under insulation cui inspection with peca lyft. Eddy current probes and application guide olympus ims. Offers noncontact pickup probe, extension cable, and driver system. Automatic multifrequency rotatingprobe eddycurrent data analysis. The examples and diagrams in this manual are included solely for illustrative. If there is a special probe you are looking for you will find it at ndt solutions, llc. We report the results of the first phase of a study designed to quantify the relationship between eddy current coil construction and the performance of these coils used in nondestructive evaluation nde inspections. Model based studies of the split d differential eddy current. Eddycurrent probe design 175 channel if the detection channel is not perfectly orthogonal to the liftoff. Based on their configurations, eddy current probes are generally classified.
The eddy probe is used to measure radial or axial shaft motion. Olympus manufactures high quality cables and adaptors to fit with all eddy current probe models. Pulsed eddy current testing pect inspection technique. Inductive sensors from microepsilon are based on the eddy current principle and designed for noncontact measurement of displacement, distance, position, oscillation and vibrations. 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. Dual element sliding probe absolute reflection this probe is designed to slide over rows of fasteners to detect flaws. Each eddy current probe available from ndts has a unique code. Eddy current brakes are best substitutes for ordinary brakes, which are being used nowadays in road vehicles even in trains, because of their jerkfree operation. A complete line of eddy current probes to choose from. General purpose eddy current probe for detection of surface and near surface defects around protruding head fasteners and other structures in aircraft structures030. Suitable for vibration, speedacceleration, rotorposition, and differential expansion measurements. For eddy current imaging an easy to handle sensor array is provided. They are particularly suitable when high precision is required in harsh industrial environments pressure, dirt, temperature.
This feature allows the probe data to remain in tolerance longer by reducing wear. In this technique, a coil also called probe or sensor is excited with sinusoidal alternating current frequency, f, 50 hz5. Nortec eddy current probes are designed and manufactured by olympus ndt in the usa. The highline automation ec14 has a frequency range of 40hz to2 mhz the instrument will meet or exceed the requirements of appendix a. Eddy current testing hareesha n g, dept of aero engg, dsce 2 3. Spot bridge differential spot bridgedifferential probes can be referred to as surface probes, but are a lower frequency than their high frequency counterparts. Additionally, custom design and manufactured probes can also be supplied. A special aircore eddycurrent reflection probe was fabricated at the national institute of standards and technology nist and used to obtain flaw signals for a number of rectangularshaped. In mountain areas where continuous braking force is needed, for a long time, the eddy current braking is very much useful for working without overheating. The ferrite core coils wound for this study are small but typical of the sizes commonly used in commercially manufactured eddy current probes. Eddy current testing is a nondestructive method for testing metal surfaces for defects such as longitudinal and transverse cracks.
The rectangular planar coils have a maximum testing area of 2. Since 1968, zetec has manufactured over 10,000 different probe designs to meet the constantly changing needs of the nondestructive testing ndt market. The type of testing performed, using comprehensive throughtype coils or rotating probes, depends on the type of defect. A uniform eddy current probe with a doubleexcitation coil. We can also design probe kits to meet your inspection needs and budget requirements. In this technique, a coil also called probe or sensor is excited with sinusoidal alternating current frequency, f, 50 hz5 mhz, 100 ma. We manufacture eddy current probes, cables, adapters, standards, and specialized kits to meet our customers needs. Eddy current testing is a contactfree technique employed for examining metallic parts. New low frequency eddy current probes of inductive and magnetoresistive type are presented and characterised. Assessment of eddy current testing for the detection of. Target temperature effect on eddy current displacement sensing is modelled, analysed and evaluated by. From detecting extremely small defects to inspecting nonflat surfaces and covering a wide area in a single pass.
Reference locations were obtained from manual classification, i. The result is a onsite calibration with an accuracy in the dimension of our laserinterferometric factory calibration. Note that cracks must interrupt the surface eddy current flow to be detected. Model based studies of the split d differential eddy. Who else but eddyfi to reinvent an eddy current technique and redefine cui programs. 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. The instrument is a dual channel dual frequency instrument. In addition to coil size and frequency, the physical shape of a probe contributes to a successful test.
Principle ec testing works on the principles of electromagnetic induction. When this field is near a conductive material, the field creates induces small electrical eddy currents in the material. Ect began largely as a result of the english scientist michael faradays discovery of electromagnetic induction in 1831. Our design team understands the regulatory requirements for tubing and plate. With this premise the eddy current sensor is suitable for general motion analysis and in automotive applications. This image is produced not by light but by scanning it with an eddy current probe containing an sdt sensor. Xprobe and cxb array probes to quickly find and characterize all flaws.
Eddy current array eca theory, practice and application. Depth of penetration effects in eddy current testing. Analysts combine their experience and information from shape of the signal. They are also fitted with a triax detachable connector but can be fitted with a 2pin microdot or 4 pinfischer connector or other connectors on request.
Eddy current testing ect as a technique for testing finds its roots in electromagnetism. Eddy probe systems have excellent frequency response. As mentioned on the previous page, eddy current probes are classified by the configuration and mode of operation of the test coils. Eddy current probe configuration the main components of an eddy current probe for nondestructive testing are a pancaketype coil and a wheatstone bridge of gmr or sdt sensors see figure 1. Pdf eddy current probes based on magnetoresistive array. The test method can be optimally integrated in the production process. We are ready to help you find the exact probe you need to get the job done.
Combination of ultrasonic and eddy current testing. Straight shaft probe for subsurface flaws detection in the second layer, through the first layer with up to 1. The eddy current differential probe is the work horse of the industry. This technology involves driving several eddy current sensors alongside each other on a single eddy current probe. The hodograph of conductivity may be imagined by joining the end points of the liftoff. Reference standards should be used in every application and are available in many configurations and materials. Furthermore eddy current sensors are perfectly suited for the observation of dynamic events. Introduction to eddy current inspection linkedin slideshare. To view additional table columns, slide right side of table to the left. Always combine the components of this system sensor, extension cable. These currents generate a magnetic field that opposes the field from the sensor. This probe boasts zetecs array coil technology and a bobbin sax probe that has an electro magnet that can be turned on and off. Eddy current probes are classified by the configuration and mode of operation of the test coils.
This paper is intended to provide information to help the user in selecting the right e. Planar rectangular coils were first used at our laboratory in an inspection for edge cracks in cooperation with an ndt crew from abroad1. Pdf design and analysis of a gmr eddy current probe for ndt. Eddy current testing permits crack detection in a large variety of. Eddy current sensors of the txseries stand out with an excellent dynamic range 100 ksas and resolutions in the submicron range.
We offer a wide selection of bobbin probes for quick tubing inspections. Probes can be designed to detect a specific type of flaw or to follow the shape of the part being inspec. The only active part of the eddy current probe is a simple. All specifications are subject to change without notice. Eddy current probe differential eddy current technology. The eddy current sensor and the reference sensor are aligned accurately to each other. It also benefits from a range of peca, singleelement pec, and applicationspecific probes to support various applications. Lshaped probe for subsurface flaws detection in the second layer, through the first layer with up to 1. Eddy current probe sensitivity as a function of coil. In this technique, the probe is excited with an alternating current, inducing eddy currents in the part under inspection. An eddy current sensor system basics an eddy current sensor produces an alternating magnetic field at the probe tip. The company manufactures all the top names in ndt such as nortec, sonic, cpx160 xray and of course nortec eddy current probes and harisonic ultrasonic transducers. Zetec eddy current surface array probes are specifically designed to solve the inspection challenges companies face everyday.
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