What is eddy current probe?

What is eddy current probe?

Reflection probes have two coils similar to a differential probe, but one coil is used to excite the eddy currents and the other is used to sense changes in the test material. Probes of this arrangement are often referred to as driver/pickup probes.

What is the eddy current method?

Eddy current testing is a non-destructive testing (NDT) inspection method used for a variety of purposes, including for flaw detection, material and coating thickness measurements, material identification and establishing the heat treatment condition of certain materials.

What are the methods of eddy current inspection?

The two major applications of eddy current testing are surface inspection and tubing inspections. Surface inspection is used extensively in the aerospace industry, but also in the petrochemical industry. The technique is very sensitive and can detect tight cracks.

How do you choose eddy current probes?

One of the most important specifications for eddy current probes is the frequency of the coil or probe transmission. This value is typically specified as the center-band frequency. Selection of frequency depends on many factors, such as material and subsurface depth of inspection interest.

What are differential probes used in eddy current NDT?

Another commonly used probe type is the ‘differential’ probe this has two sensing elements looking at different areas of the material being tested. The instrument responds to the difference between the eddy current conditions at the two points.

What is the advantage of a ferrite core probe over an air core?

Probes with ferrite cores tend to be more sensitive than air core probes and less affected by probe wobble and lift-off.

What material S is are commonly used to shield an eddy current probe?

Eddy current shielding uses a ring of highly conductive but nonmagnetic material, usually copper, to surround the coil. The portion of the coil’s magnetic field that cuts across the shielding will generate eddy currents in the shielding material rather than in the nonrelevent features outside of the shielded area.

What is a differential probe?

A differential probe is used to look at signals that are referenced to each other instead of earth ground and to look at small signals in the presence of large DC offsets or other common mode signals such as power line noise.

What is absolute probe?

Absolute probes generally have a single test coil that is used to generate the eddy currents and sense changes in the eddy current field. Absolute coils can be used for flaw detection, conductivity measurements, liftoff measurements and thickness measurements. They are widely used due to their versatility.

What are disadvantages of eddy current?

Disadvantages of eddy current: There is more leakage of flux occurred in it. Heat loss is more. This not useful to inspect all types of metals(Only conductive metals can be inspected) Complex designs are not inspected with accurately.

What kind of eddy current probes does Olympus offer?

Olympus eddy current probes consist of the acquired brands of Nortec and NDT Engineering. We offer more than 10,000 standard and custom designed eddy current probes, standard references, and accessories. This section features many of the standard design probes that are available in a wide range of diameters, frequencies, and connector styles.

What is eddy current testing and how does it work?

Eddy current testing is a non-destructive testing (NDT) inspection method used for a variety of purposes, including for flaw detection, material and coating thickness measurements, material identification and establishing the heat treatment condition of certain materials. What Is Eddy Current Testing? How Does Eddy Current Testing Work?

What is MRPC and X-probe?

X-Probe and CXB multi-coil array probes to quickly detect and characterize all flaws, including circumferential cracks Rotating (MRPC) probes to detect and characterize all flaws at expansion, in small radius U-bends, in tube plugs and in repair sleeves Remote Field probes for inspection of high permeability tubing and pipe

What is the temperature range of the TX-series eddy current sensors?

Besides robustness, high dynamics and high resolution the TX-Series also stands out with a wide temperature range. With a temperature range from -60°C up to 180°C eddy current sensors are the ideal choice for applications in combustion engines. Eddy-current sensor for measuring ranges up to 10 mm, T-series