Grouping multiple coils also gives the acquisition and analysis software the ability to display data in the form of 2D and 3D C-scans. It is already being used in the aerospace and nuclear industries, among others, for its capacity to quickly scan surfaces and accurately detect surface-breaking defects.ĮCA technology uses multiplexing-several individual coils are grouped together in one probe and excited sequentially-to eliminate interference from mutual inductance and to enable scanning wider areas. Eddy Current Array (ECA) technology is the next stage in ECT evolution. Compact ECA probes designed for gear teeth profiles, that are rugged, and easy to handle.Įddy Current Testing (ECT) is an electromagnetic technique well known for its surface-breaking crack detection capabilities.be easy to handle by gloved operators, in a dirty environment.be capable of reliable surfacebreaking crack detection and record keeping.take less time to perform than MT, PT, and UT.be capable of scanning the addendum, dedendum, and root of a gear tooth in one pass.UT also requires couplant, also making a postinspection clean-up necessary.Ī better inspection method was therefore necessary, one that would: UT, on the other hand, is faster than the above two inspection methods, but because of the near-surface “dead zone” intrinsic to the technology, it is somewhat blind to surface-breaking cracks. At best, these two testing methods can help detect the existence of flaws, but they only offer rudimentary length information. Moreover, they are messy and require pre-inspection and postinspection clean-ups. MT and PT are time-consuming, can easily miss small defects, and only offer crude repor ting/record-keeping capabilities. Surfacebreaking cracks are typically found in the addendum, dedendum, and fillet of gear teeth, although they can also occur elsewhere.ĭepending on the size and type of gears, they are usually tested for defects using a variety of techniques, most notably magnetic-particle (MT), dye-penetrant (PT), and ultrasonic (UT) testing, or any combination of the three. Over time, gear teeth are prone to surface cracking because of the constant torque they are submitted to. Develop an alternative to MT, PT, and UT to reliably inspect gears for surface cracking.
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