USER'S GUIDE ____________________________________________________________________
104 __________________________________________________________________ M211187EN-C
0009-005
Figure 36 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 37 on page 105.
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