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In the traditional version of eddy current testing an alternating (AC) magnetic field is used to induce eddy currents inside the material to be investigated. If the material contains a crack or flaw which make the spatial distribution of the electrical conductivity nonuniform, the path of the eddy currents is perturbed and the impedance of the ...
In electromagnetism, an eddy current (also called Foucault's current) is a loop of electric current induced within conductors by a changing magnetic field in the conductor according to Faraday's law of induction or by the relative motion of a conductor in a magnetic field. Eddy currents flow in closed loops within conductors, in planes ...
The six most frequently used NDT methods are eddy-current, magnetic-particle, liquid penetrant, radiographic, ultrasonic, and visual testing. [3] NDT is commonly used in forensic engineering , mechanical engineering , petroleum engineering , electrical engineering , civil engineering , systems engineering , aeronautical engineering , medicine ...
The market for eddy current NDT equipment is evaluated to reach a valuation of US$ 1.06 billion by the end of 2034. North America is evaluated to capture a 27.7% share of global market revenue by 2034. The East Asian market for eddy current NDT equipment is analyzed to advance at a 7.5% CAGR from 2024 to 2034.
Electromagnetic testing (ET), as a form of nondestructive testing, is the process of inducing electric currents or magnetic fields or both inside a test object and observing the electromagnetic response. If the test is set up properly, a defect inside the test object creates a measurable response.
Eddy current sensors are displacement sensors that use the principle of eddy current formation to sense displacement. These sensors measure shaft displacement in rotating machinery and have been around for many years as they offer manufacturers high-linearity, high-speed measurements, and high resolution. [ 1 ]
Although RFT works in nonferromagnetic materials such as copper and brass, its sister technology eddy-current testing is preferred. The basic RFT probe consists of an exciter coil (also known as a transmit or send coil) which sends a signal to the detector (or receive coil). The exciter coil is pumped with an AC current and emits a magnetic field.
The displacements measured are extremely small, typically only several thousandths of an inch. Bently's application of eddy-current sensor technology was the foundation of an entire industry. [14] Bently added proximity transducers, monitors, and portable test equipment to its catalog.