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AIR TRANSPARENCY MONITOR, XENON FLASH RECEIVER
I designed this circuit many years ago to monitor the quality of a mile long column
of air for future optical communications experiments. The transmitter system
(circuit 72 below) uses a powerful xenon flash in conjunction with a large 12 inch
Fresnel lens at the transmitter end and a matching 12-inch lens with a PIN photo
diode at the receiver. The receiver system was connected to a weather station and a
computer to collect the changes in intensity of the light flashes under different
weather conditions. It has the potential for a 30+-mile range. I have also used this
system to conduct cloud bounce experiments.
BROAD BAND 2MHz OPTICAL FIBER RECEIVER
If you need more sensitivity than the above circuit this circuit provides about ten
times more gain. It too is designed around an inexpensive plastic optical fiber
detector.
BROAD BAND 5MHz OPTICAL FIBER RECEIVER
This circuit is a simple broad band light detector that uses a very inexpensive IC and a
PIN photodiode that is packaged for use with plastic optical fibers. It has a bandwidth
from 1KHz to over 5MHz. It is great for experimenting with various modulated light
sources.
CASCODE LIGHT RECEIVER CIRCUIT
This page provides a detailed explanation of how the modified cascode light receiver
circuit operates. The cascode technique in conjunction with an inductive load
provides very high current to voltage conversion as well as very high speed.
FET
INPUT HIGH SPEED LIGHT DETECTOR
This circuit is yet another design that converts current from a PIN photo diode to a
voltage. It has a bandwidth that extends beyond 50MHz.
