Interpolation Method
To account for the assymmetry of the clock signal, it is first normalised and mean adjusted. The zero point is set to be midway between mean high and low states, and the scale is set to 1. The result of this normalisation is shown below.
The phase is taken by interpolating the zero crossing of the first positive to negative transition of the waveform. All of the phase differences are taken relative to SURF 1, and modulo the clock period of 29.970ns (as measured). The measured phase differences from the first 100,000 events of run 1028 are shown below. On an event by event basis the correction is:
- Corr = DeltaPhi
Copyright © 2006 Ryan Nichol, (last modified 06 Jun 2007)