User Manual
8
4. Ali nment Procedure
When you have installed the Silver Gate™ ATR accessory into your
spectrometer on its appropriate Benchmark™ baseplate, you should
check for alignment of the accessory. An overall spectral throughput of
between 20% and 55% for ZnSe and Ge ATR flat or recessed crystal
top plate assemblies should be achievable. The Silver Gate™ ATR will
be supplied having a preliminary factory alignment. On installation,
some transmitted energy should be recorded on the spectrometers
energy/light throughput to detector monitoring system, but it will be
necessary to maximize the optical throughput for any specific
spectrometer by adjusting the mirrors in the optical unit of the Silver
Gate™ accessory. To carry out any alignment procedure one of the
Silver Gate™ ATR flat or recessed crystal top plate assemblies must
be fitted to the optical unit.
Fitting of the ATR Crystal Top Plate to the Optical Unit
Six different versions of Silver Gate™ ATR crystal top plate assemblies
can be fitted to the optical unit. They are:-
ZnSe flat crystal top plate assembly, P/N GS10683-1.
Ge flat crystal top plate assembly, P/N GS10683-2.
Si flat crystal top plate assembly, P/N GS10683-3.
ZnSe recessed crystal top plate assembly, P/N GS10684-1.
Ge recessed crystal top plate assembly, P/N GS10684-2.
Si recessed crystal top plate assembly, P/N GS10684-3.
The flat and recessed ATR crystal top plate assemblies are fitted to the
top plate area of the Silver Gate™ optical unit by location holes (2) to
location pins (3) and held in place by magnetic catches (4) to counter
plate fixings (5). (Please see Figures 2, 3, 4 and 5.) Top views of the
flat and recessed ATR crystal top plate assemblies using the ZnSe
crystal as examples are Figures 2 and 3. (Ge and Si top plates are
similar.) The underside view of either the flat or recessed ATR crystal
top plate assembly is shown as Figure 4. The top surface (without
bridge) on the optical unit where to fit the ATR top plates is shown in
Figure 5.
