USER'S GUIDE ____________________________________________________________________
22 __________________________________________________________________ M210543EN-F
Light Receiver
The Light Receiver consists of a PIN photodiode, preamplifier, voltage to
frequency converter, backscatter measurement light source LED, and
control and timing electronics.
The receiving PIN photodiode senses the transmitted light pulses
scattered from the aerosol particles. A phase sensitive lock-in amplifier
synchronized with the transmitter filters and detects the signal voltage.
An ambient light level as high as 30 kcd/m
2
does not influence the
detection of the photo diode and does not saturate the preamplifier. The
AMBL signal (proportional to the ambient light) is lead to the CPU for
monitoring.
To Next Page
Loading...
