Design of the Optical Module
DSX™ System Service Manual 10-3
The lamp used in the reader is the Gilway Technical lamp # L7416, which has a nearly square
aspect ratio. The square aspect ratio is important to optimize coupling to the fiber optic and
this optimizes the amount of light that is focused on the wells. If a user were to replace the
bulb with a different lamp, the useful intensity of the lamp (and thus the sensitivity) could
drop by as much as 70%.
An aspheric lens is used to focus the light to provide even illumination and minimize the
incident angles on the bandpass filter. The bandpass filter has a 10-mm diameter clear
aperture.
10.2.3 Electrical/Control Considerations
Activities of the Reader Module (e.g. movement of plate carrier, changing the filter) are
performed under the direct control of the program that is being executed by the Revelation
application program for calculation of the concentration of the compound(s) of interest in
each sample.
A functional diagram of the Reader Module is presented in Figure 10-2.
MICROPROCESSOR
WELL
PHOTODIODES
1-12
REFERENCE
PHOTODIODE
ANALOG/DIGITAL
CONVERTER
STEP MOTOR
DRIVERS
STEPPER
MOTORS
MULTIPLEXER
LAMP
PWM
LAMP
COMM
PORTS
Figure 10-2 Functional Diagram of the Reader Module
To Next Page
Loading...
