Procedure for the determination of the average MRTDav
The average MRTD (MRTDav) Is determined as follows:
1) Draw a graphic of spatial frequency (vertical axis) against temperature difference (horizontal axis) using values obtained from +he MRTD-graph, The resulting graph shows the "spatial resolution function" (SRF).
NOTE: The SRF is the inverse function of the MRTD (See also Fig.1 and fig. 2).
fig. 1 MRTD-curves
fig. 2 SRF-curves.
4) Repeat step 2 and 3 for a number of values of temperature difference ΔT.
5) Draw a curve, using the average SRF-values found at step 3 and 4.
6) Reverse the process of step 1. Draw the MRTD-curve with spatial frequency along the horizontal axis and temperature difference along the vertical axis. For the average MRTDav-curve use the calculated average SRFav -values.