Nondestructive Testing (NDT) Probes

Nondestructive testing (NDT) probes and sensors include eddy current, ultrasonic, induction, hall effect and EMAT and other specialized transducers. They enable materials, components, systems and parts to be tested without limiting future usability. Specialty nondestructive testing (NDT) probes and sensors use many different and unique technologies, but often consist of ultrasonic, eddy current, or corrosion-detection devices. Typically, these NDT products are used to perform acoustic emission testing, interferometry, leak testing, magnetic particle testing, radiographic testing, or computed tomography. Specialty nondestructive testing (NDT) probes and sensors can also reveal fatigues or cracks in n aircraft parts such as landing gear, or can be used to test raw materials such as steel during the early stages of production.

Specialty nondestructive testing (NDT) probes and sensors trigger a test event and can collect data about the performance of a material, component, system or part. For example, specialty NDT equipment for magnetic particle inspection uses iron oxide particles that are held in a suspension or liquid carrier. These particles are coated with a fluorescent dye. During test and inspection, the suspension is sprayed over the test sample, which is magnetized with an electromagnet. An ultraviolet (UV) light passed over the sprayed sample detects where the magnetic field is escaping from the surface.
 
Many specialty nondestructive testing (NDT) probes and sensors are used in ultrasonic or eddy current testing. An ultrasonic NDT sensor is typically a silicon pressure sensor or accelerometer. Specialty NDT probes and sensors may also include devices that test for precision thickness and metal-to-metal or other bonds. There are three main types of bond testing probes: pitch catch probes, mechanical impedance analysis probes, and resonance probes. Other types of bond testing probes may also be available.

Some specialty nondestructive testing (NDT) probes and sensors use electromagnetic comparators to differentiate between components that are manufactured from different metals. Electromagnetic comparators use coils that are charged with an AC current. When a metal part is brought close to the coil, the voltage output of the coil is affected. These specialty NDT probes and specialty NDT sensors use the comparison of the amplitude, phase, and harmonic distortion of the voltage output to determine the component’s makeup.

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