WellCAD Basics - Advanced Logic Technology

1.5.13.3 Drift Correction
Spectrum a temperature T1
Spectrum a temperature T2
Temperature channel
used to identify and
compute amount of
peak shift.
List of logged in
stations.
User picked
characteristic peaks to
determine and correct for
peak shifts.
BOOK 1 - WELLCAD BASICS - 155
Temperature gradients within the crystal or tube may results in peak shifts. The drift
correction process is a simple algorithm that can be used to correct for this. The idea
of the process is described in the following figure.
T1
T2
P1
P1
The position of up to two characteristic peaks (P1 and P2) at two or more different
temperaturesare selected by the user. For each trace the amount of shift is calculated
according to the temperature change. The count data is shifted within the trace
accordingly. If only a single characteristic peak the entire trace will be shifted, if two
peaks have been chosen per trace constant shifts are applied for the data before P1
and after P2. Between the peaks the shift is calculated from original peak position
and shifts for P1 and after P2.
P2
P2
Drift Correction dialog box
Calculated shift