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48 NIRvana
™
-LN System Manual Issue 4
5.7 Data Collection
Perform the following procedure to begin acquiring data:
1.
After the system has been rotationally aligned and focused, stop running in
Alignment
or
Run
mode.
2.
Make any required changes to the experiment’s setup and software parameters.
Changes may include adjusting exposure time, setting up an entrance slit shutter,
changing timing mode to External Sync, and/or lowering the target temperature.
3.
Begin running
Acquire
mode.
Data will be acquired and displayed/stored according to the experiment’s configuration
settings.
4.
When data acquisition is complete, the detector power should remain on so the array
temperature will remain locked for subsequent data acquisition.
If no further data is to be collected, proceed to
Section 5.8, Shut Down Procedure .
5.8 Shut Down Procedure
Perform the following procedure to shut down the system:
1. For liquid nitrogen cooled systems:
Carefully empty the Dewar and store the liquid
nitrogen that has been removed.
CAUTION!
!
Because of the low operating temperatures, cryogenically-cooled
detectors must always remain powered ON when Liquid Nitrogen
(LN) remains in the dewar.
Always keep the detector powered ON following the completion
of all experiments until all LN has either been removed or
allowed to evaporate from the dewar, and the detector has
warmed up to ambient temperature.
WARNINGS!
1.
Always wear protective equipment when working with Liquid
Nitrogen. Even minimal contact with LN can cause severe injury to
eyes and skin. Avoid contact with the splashing that will invariably
accompany the pouring of LN into a room temperature Dewar.
2.
Always be careful when removing the Dewar filler cap if there is
LN present in the Dewar. Pressure due to nitrogen gas can cause
the cap to fly out when the retaining nut is loosened, possibly
spraying you with liquid LN, which can cause severe injury.
2.
Close LightField.
3.
Turn off spectrometer power (when applicable.)
4.
Turn off the detector power.