Thermonicolet Omnic Software User's Guide 6.1 (PDF) - Charles E ...

Checking spectrometer performance at the start of data collection..... 118
Entering an experiment description..................................................... 118
File handling........................................................................................ 118
Background handling........................................................................... 119
Titling the experiment ......................................................................... 120
Bench features .......................................................................................... 120
Using the live display .......................................................................... 121
Setting the gain .................................................................................... 123
Specifying the mirror velocity............................................................. 123
Setting the aperture size....................................................................... 123
Specifying the sample location............................................................ 125
Specifying the detector type ................................................................ 125
Specifying the beamsplitter type ......................................................... 126
Specifying the source type................................................................... 126
Specifying the accessory...................................................................... 126
Specifying the window material .......................................................... 126
Using a sample shuttle......................................................................... 126
Specifying the spectral range............................................................... 127
Quality checks .......................................................................................... 127
What sensitivity setting should I use?.................................................. 130
Checking for the presence of peaks..................................................... 130
Checking for totally absorbing peaks .................................................. 130
Checking for fringes or channeling ..................................................... 131
Checking for derivative peaks ............................................................. 132
Checking the baseline.......................................................................... 133
Checking for carbon dioxide ............................................................... 133
Checking for water vapor .................................................................... 133
Checking the spectral range................................................................. 133
Checking the apodization .................................................................... 134
Checking the resolution ....................................................................... 134
Checking the background for contamination....................................... 134
Checking for detector icing ................................................................. 134
Checking the background for carbon dioxide or water ....................... 135
Checking the background for an accessory ......................................... 135
Checking the interferogram amplitude ................................................ 135
Comparing the interferogram amplitude with the noise level ............. 135
Advanced parameters................................................................................ 136
Specifying the number of levels of zero filling ................................... 137
Selecting the apodization type............................................................. 137
Specifying the sample spacing............................................................. 138
Specifying the phase correction........................................................... 139
Specifying the cutoff frequency of the low pass filter......................... 139
Specifying the cutoff frequency of the high pass filter........................ 140
Collecting single-sided interferograms................................................ 140
Resetting the spectrometer at the start of data collection..................... 141
Starting data collection with an external trigger.................................. 141
Diagnostic and alignment features............................................................ 141
Checking spectrometer components .................................................... 142
Checking the desiccant ........................................................................ 142
Aligning the spectrometer.................................................................... 143
Configuring the system........................................................................ 143
Matching the parameter settings of a spectrum.............................................. 146