Optical Bench; Figure 10-5: Optical Bench Layout - Top View - Teledyne 400E Instruction Manual

Model 400E Ozone Analyzer
Instruction Manual

10.3.3. Optical Bench

Electronically, the Optical Bench is a group of subassemblies that emits UV Light of
the proper wavelength; passes it though a tube filled with Sample Gas; detects the
presence of UV radiation not absorbed by any O
outputs a voltage signal proportional to the amount of UV detected.
UV Detector
Preamp Assy
UV Detector
Sample Gas Inlet
Photometer UV Lamp
A mercury-vapor UV lamp. This lamp is coated in a material that optically screens
the UV radiation output to remove the O
of the light emitted is at the 254nm wavelength.
P/N 04316 Rev: B
Optical Bench
Chassis
Housing
UV Lamp
Power Supply
Figure 10-5: Optical Bench Layout – Top View
present in that Sample Gas and
3
Absorption Tube
Sample Gas
Temperature
Sensor
producing 185nm radiation. The majority
3
THEORY OF OPERATION
UV Lamp Heater
& Temperature
Sensor Assy,
UV Lamp
Sample Gas
Outlet
229