Epson USN 52R Calibration with angle-beam probes, Known sound velocity, Unknown sound velocity

Operation USN 52R/USN 52L calibration

Calibration with angle-beam probes

Known sound velocity

In this case, it is sufficient when there is an echo from a known reflector with a known distance, e.g. the arc of the calibration block V1, V2.

–Enter known sound velocity MTL VEL

–Set Gate a to the first echo

–Set ZERO so that the correct value is displayed in the measurement line “S=...”.

Example:

Calibration of the 100 mm range for steel (trans) using calibration block V2

–Enter sound velocity MTL VEL (3255 m/s)

–Set RANGE to 100 mm.

–Set DELAY and ZERO to 0.

–Couple the probe and peak the first echo from the 25 mm radius of V2.

–Set Gate a to the first arc echo.

–Adjust ZERO so that “S=25" is displayed in the measurement line.

The display range is now calibrated. For the measure- ment you can now enter the values for ANGLE, X- VALUE and THICKNESS.

Unknown sound velocity

In this case you will require a calibration block made of the test material. A semicylinder is suitable for this purpose.

Couple the probe to the plane of section of the semicylinder with the radius R, and peak the first echo from the semicircle. An echo sequence occurs with the sound paths R, 3R, 5R, etc.

You apply these echoes for calibration the same as the backwall echoes described above which come from a plane-parallel calibration piece with vertical beaming.

5-20 Issue 05, 02/00 Krautkramer USN 52R/USN 52L