Specifications

46 SPCM Software
- Calculation of photon counting histograms for the individual detectors (‘FIDA’). The
sampling time interval is specified on the right.
- Calculation of lifetime histograms (FILDA) for all detectors. The sampling time interval is
specified on the right.
- Intensity traces (MCS) for the individual detectors.
For all functions specified for runtime display individual display windows are provided in the
main panel, see ‘Configuring the SPCM Main Panel’ page 37. The data displayed within these
windows are defined by the ‘Trace Parameters’. Each display window has its own set of trace
parameters. The trace parameter definitions for ‘Decay’, ‘FIDA’, ‘FILDA’ online display are
shown in Fig. 75. Traces for DPC channels 1 to 4 are displayed.
Fig. 75: Trace Parameters of the DPC-230, for decay curve, PCH, and MCS
The trace parameters for ‘FCS’ are shown in Fig. 76. The trance parameters for FCS without a
fit are shown left. ‘Channel’ and ‘Cross FCS Channel’ define the DPC detector channel num-
bers for the data to be correlated and displayed. If ‘Curve’ and ‘Cross-FCS Curve’ are the
same the autocorrelation function of the channel is calculated. Thus, the configuration shown
calculates the autocorrelation functions of channel 4 and 5, and the cross-correlation of chan-
nel 4 versus channel 5.
If the fit function in the runtime configuration panel is enabled (see Fig. 74, right) the trace
parameter panel is as shown in Fig. 76, right. For each trace can be defined whether an FSC
curve or a fit curve is displayed.
Fig. 76: Trace parameters for FCS display. Left without, right with fit of the FCS curves
For reasons of computation speed and memory space, the software calculates only one correla-
tion function per detector channel. If the Trace Parameters define several correlation functions
for one channel, e.g. an autocorrelation and a cross-correlation with another channel, only the
first correlation is calculated during the measurement. The other ones are calculated and dis-
played after the measurement has been completed.
Configuring the Inputs
The configuration panel for the configuration of the DPC inputs is shown in Fig. 77. The
panel is opened by clicking on ‘Input Configuration’ in the system parameter panel.