Pulser Power; Figure 13-6 Detection Of The First Or The Second Negative Peak - Olympus 38DL PLUS User Manual

DMTA-10004-01EN, Rev. D, November 2016
measuring the length of bolts or the thickness of gel coat over fiberglass (see
Figure 13-6 on page 228). In these cases, to help stabilize the echo detection and
thickness measurements, select the first peak algorithm to detect the first of several
peaks of similar amplitudes (see step 5.c in "Creating a Custom Setup for a Single
Element Transducer" on page 221).
Figure 13‑6 Detection of the first or the second negative peak

13.5 Pulser Power

You can set the excitation pulse (main bang) voltage to one of the following values:
60 V, 110 V, 150 V, and 200 V.
Higher voltages may provide greater penetration at the expense of a lower near-
surface resolution, especially in mode 1. Inversely, lower voltages may provide better
near-surface resolution at the expense of a lower penetration.
For most applications, the 110 V value provides the best signal-to-noise ratio for
returning echoes. The pulser power indicates the voltage used to excite the transducer
and therefore, affects the size of the initial pulse (see Figure 13-7 on page 229) and the
amount of energy going into the material.
228 Chapter 13