Beam intensity and noise measurements
The beam intensity of a defined focus size on a sample and the observed baseline noise are recorded below. Typical noise values measured in reflectance with details of the measurement conditions are given below. The noise is assessed periodically in two 100 cm-1 regions as a %T spectrum calculated from two sequential “single beam” spectra collected under identical conditions.
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| 2450-2550 cm-1 | 1190-1290 cm-1 |
% noise | 0.02 | 0.05 |
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Beamline calibration
Beamline calibration is undertaken by the staff in advance of users’ experiments, or following a change of beamline configuration during an experiment (e.g. from reflectance to ATR).
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Signal-to-noise comparison
The signal-to-noise ratio is significantly improved by the use of the synchrotron source over a conventional lab-based mid-IR source, e.g. Globar. Figure 15 shows an approx. 20-40 fold improvement in the signal-to-noise when using the synchrotron source.
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