Mirror Assembly; Light Baffle; Bandpass Filter - Thermo Scientific 43iQ Instruction Manual

Firmware
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Optical Bench
The Optical Bench DMC contains the key components of the optical
measurement that eventually results in SO concentration. In the reaction
DMC
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chamber pulsating light from the flash lamp excites the SO molecules. A
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condenser lens collects and focuses light from fluorescing SO molecules
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onto the PMT assembly.
Heated Hydrocarbon
The heated hydrocarbon kicker removes hydrocarbons from the gas stream
while leaving the SO concentration unaffected. It operates on a selective
Kicker
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permeation principle using differential pressure to force hydrocarbon
molecules to pass through the tube wall. The differential pressure is created
across the tube wall as sample gas passes through a capillary tube which
reduces its pressure. The sample gas is then fed to the shell side of the
hydrocarbon kicker. The heated kicker operates at the same temperature as
the optical bench and requires no additional power.
Optical Bench
The optics section provides the light source for the fluorescence reaction
and optimizes the reaction with a system of lenses and mirrors. It includes a
Hardware
flash lamp, condensing lens, bandpass mirror assembly and light baffle.
Condensing Lens
The condensing lens focuses light from the flash lamp into the mirror
assembly.

Mirror Assembly

A set of four mirrors selectively reflects only those wavelengths used in
exciting SO molecules. This reflective filtering causes the radiation
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reaching the detection chamber to be more intense and more stable
throughout the lifetime of the instrument.

Light Baffle

The circular baffle helps keep stray light from entering the detection
volume.

Bandpass Filter

The bandpass filter restricts the light reaching the photomultiplier tube to
the SO fluorescence wavelengths.
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43iQ Instruction Manual Thermo Scientific