Teledyne Princeton Instruments NIRvana HS, System Manual

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70 NIRvana HS System Manual Issue 1.0
Figure 9-1: Typical Online Corrections Expander: Background Subtraction
9.3 Flatfield Correction
Non-uniformity of illumination sources, optical non-uniformity (i.e., vignetting,) and/or
the non-uniformity of the InGaAs detector can be compensated for by applying
Flatfield Correction. This procedure is performed by first setting up the experiment
parameters, waiting until the detector has reached operating temperature to ensure
stability, and taking a Flatfield Reference image of the illumination source (without the
sample.)
Flatfield Correction is enabled and configured on the Online Corrections expander
within LightField. The Flatfield Reference File is also acquired from within this same
expander. See
Figure 9-2 .
Figure 9-2: Typical Online Corrections Expander: Flatfield Correction
After the flatfield image has been acquired, select Automatic Flatfield Correction and
specify the data file to be used. Then, configure the experiment with the sample in place
and acquire data. The Flatfield data will automatically be applied to the raw data and the
resulting data will be displayed and/or stored.
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