User's Guide _______________________________________________________________________
136 __________________________________________________________________ M211107EN-C
0009-005
Figure 39 FST102 Transmitter Block Diagram
A pulse signal from the FSR102 Receiver synchronizes the infrared LED
timing with the lock-in amplifier of the receiver.
An additional photodiode measures the light scattered back from the lens,
other objects, or contaminants. The window contamination measurement
principle is based on the change of the total reflection of the light beam
on the window surface. The principle is shown in Figure 40 on page 137.
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