FIELD OF INVENTION
The invention relates to an Ultrasonic test system having an UT equipment and a
probe. More particularly, the invention relates to a device for measuring
resolution capability of an ultrasonic testing equipment and probe combination in
a single step-and at a specific gain setting.
BACKGROUND OF THE INVENTION
Ultrasonic testing is a welt-established non-destructive testing method for
evaluating the quality of raw material, semi-finished and finished products.
One of the important characteristics of a UT test system is its ability to detect
two defects which are close to each other in the depth direction (called depth
discrimination) or lateral direction (called lateral resolution). This characteristic is
called the resolving power of the ultrasonic system.
A common method being practiced for identifying the resolution of ttie UT
system, is using a calibration block as per BS 2704, where three distances from
the reference for example, at 85mm, 91mm and 100mm are used for normal
beam probe. In case of an angle beam probe, RC blocks are generally used.
Three distances in VI block, and 3 holes In RC block are said to be resolved if
the peak indications are seen to satisfy the resolution requirement as per the
code.
The Welding Institute, TWI, UK [Reference : Procedures and recommendations
for the ultrasonic testing of butt welds, The Welding institute, UK, 1971] has
described a blocl