High Frequency Surface Probes

These probes are commonly used for surface crack detection.  The different degrees and sizes available allow the user to inspect restricted areas. 

When choosing a probe/s that best fit your needs determine the following;

۰ What instrument will you be using your probe with?

۰ What type of probe do you need for your inspection (45°, 90°, Straight, Crank, Bend, Other, Absolute or Differential?)  Is the area you need to inspect easily accessible or not?  This will help you to decide the shape, size and length of the probe you will need.

۰ What frequency do you need for your inspection?

۰ Will you need a shielded or unshielded probe?

Special

We build many different kinds of surface probes. If you have an area you would like to inspect and a standard surface probe won't meet your needs we will build a surface probe to fit your specific requirements and budget. 

Coil Types

Absolute

۰ Single coil

۰ Detects changes of a gradual nature and also changes which are drastic in nature.

Differential

۰ Two or more coils

۰  Detects sharp changes and cracks.  Does not respond well to slow changes in the inspection material or continuous defects in the material.

Reflection

۰ Works with Differential or Absolute  set-ups.

Shaft Options

Frequency Options

High Frequency

High frequency probes are best for surface crack detection

Low Frequency

Low frequency probes are best for penetrating non-ferrous materials.  These are used primarily for the detection of sub-surface cracks or corrosion.  The lower the frequency the better the penetration.  Low frequency probes are usually larger than high frequency probes.

۰ 200KHz (Default), 500KHz - 1MHz, 1 - 3MHz

When inspecting near edges, changing cross section,  non-ferrous material adjacent to ferrous material or when you are looking for short flaws use shielded probes. The inspection field is narrow.  It is more sensitive to short cracks, changes in the inspection material geometry and ferrous materials adjacent to it.  Edges do not affect the output making it easy to operate close to edges.  In order to cover any surface area, a closer scan is required.

Unshielded Probes

When inspecting constant cross sections, or long cracks use unshielded probes.  These probes typically cost less and have a broader eddy current field when compared to shielded probes.  They tolerate lift-off and changes in the angle of the probe and less scanning passes are required due to their broad field.  This is beneficial for the inspection when only large cracks are of interest and when the inspection area stays the same.