Agilent 5110/5100 ICP-OES Service Manual Agilent Restricted 51
3 General Information
Pre optics assembly
There are two heater pads fixed to the outer polychromator box. The heat from the pads and
outer box is transferred to the polychromator casting across an air gap. The air gap acts as a
low pass filter that attenuates any sharp temperature variations that occur between ambient
room temperature, the heater box and the casting.
The temperature regulation of the casting minimizes any effects the internal and external
temperature changes may have on optical components.
Pre optics assembly
The pre-optics assembly is the interface that gathers light from the plasma in either an axial
and/or radial view and passes the radiated emissions through to the Polychromator via a series
of mirrors.
The pre-optics module is thermally decoupled from the Polychromator using a peltier driven
thermal stabilizer to maintain temperature stability of the optics. It does this by pumping heat
away from the Polychromator when the plasma is on and pumping heat into the Polychromator
when the plasma is off.
The thermal stabilizer contains two thermoelectric heat pumps to transfer the heat in either
direction depending on the plasma status. The thermal sensor provides feedback and
monitoring of temperature in the stabilizer. The pre optics casting acts as the heatsink to
prevent heat from being drawn into polychromator when the plasma is on.
Figure 9. Pre optics ray trace in Synchronous mode
The Synchronous Vertical Dual View pre-optics consists of Axial and Radial optics and utilizes
Dichroic Spectral Combiner (DSC) technology to combine Axial and Radial beams sychronously
(Blue and Red light paths).
Vertical Dual View only is the same optical configuration as Synchronous except uses a mirror in
place of DSC beam combiner.
Radial pre-optics consists of components in Red light path only (No beam combiner required).
In “Synchronous Vertical Dual View” the beam combiner rotates the DSC beam combiner into
the light path to allow both Radial and Axial light to combine and enter the Polychromator
simultaneously.
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