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Chapter 5 Microscopy Applications 31
Note:
The detector lens mount itself also has a focus adjustment. Although it is unlikely
that you would ever need to use this adjustment in operation with a microscope (it is
preferable that you use the relay-lens focus adjustment), it could be used if necessary.
The procedure for using the adjustment is provided in Chapter 4.
Microscope optics have very high transmission efficiencies in the infrared region of the
spectrum. Since typical microscope light sources are very good emitters in the infrared,
some microscopes are equipped with IR blockers or heat filters to prevent heating of
optical elements or the sample. For those microscopes that do not have the better IR
blockers, the throughput of infrared light to the CCD can be fairly high. In addition,
while the eye is unable to see the light, CCD detectors are particularly efficient in
detecting infrared wavelengths. As a result, the contaminating infrared light will cause a
degradation of the image quality due to a high background signal that will be invisible to
the eye. Therefore, it is recommended that you add an IR blocker prior to the detector if
you encounter this problem with the microscope.
Before You Start
, if your system includes a microscope Xenon or Hg arc lamp, it is
CRITICAL
to turn off all electronics adjacent to the arc lamp, especially your digital
detector system and your computer hardware (monitors included) before turning on the
lamp power.
Powering up a microscope Xenon or Hg arc lamp causes a large EMF spike to be
produced that can cause damage to electronics that are running in the vicinity of the
lamp. We advise that you place a clear warning sign on the power button of your arc
lamp reminding all workers to follow this procedure. While Roper Scientific has taken
great care to isolate its sensitive circuitry from EMF sources, we cannot guarantee that
this protection will be sufficient for all EMF bursts. Therefore, in order to fully
guarantee the performance of your system, you must follow this startup procedure.
CAUTION
WARNING