System Description . 31
Mirrors 14 and 15 are used to select the appropriate detector. The mirror translation unit
(Figure 11) has three positions. At position 1, mirror M14 (the aluminum, SiO
2
-coated mirror)
directs the beam to the PMT detector at the base of the compartment. At position 2, both
mirrors are outside of the beam path, and the beam goes to the InGaAs detector. At position
3, mirror M15 (the gold mirror) directs the beam to the PbS detector at the top of the optics
compartment. The changeover between the detectors occurs at predefined wavelengths, and
is controlled by the software.
Figure 11 The arrangement of the detectors of the Three Detector Module
Sphere-only Systems
In addition to the standard configurations described above, the Lambda 650/750/950/1050
spectrometers can be supplied with an integrating sphere only, containing a PMT detector for
the UV-vis range and either a PbS or InGaAs detector for the NIR range. These systems have
simpler optical designs than the standard configurations, and therefore the spectral scanning
ranges in the UV/Vis and NIR regions are slightly reduced. The detector options and range
specifications depend upon the spectrometer model; consult your PerkinElmer Service
Representative for more details. Further information on the sphere detectors is available in
the
Sphere Accessories User’s Guide
(L6050011); we recommend that you read this user’s
guide before installing your sphere accessory and switching on the power to the
spectrometer.
Detector-less Systems
All of the high performance Lambda spectrometer systems can also be supplied with no
detectors included, although a detector must be installed before the system can be operated.
Consult your PerkinElmer Service Representative for more details.
detector
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