Sensors /
Detectors: Light Detectors
and Optical Sensors
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Sensors / Detectors -- Main
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Light Detectors / Optical Sensors: #'s
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Last Updated on:
Monday, October 03, 2011 06:07 PM |
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Circuits Designed by Dave Johnson, P.E. : |
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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.
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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.
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BROAD BAND 50MHz OPTICAL FIBER RECEIVER VERSION A
If the above circuit it still too slow, you can try this circuit. What it lacks in
sensitivity it makes up for in speed. The circuit attaches a plastic fiber optic PIN
photodiode assembly to a small box containing a small 3v battery and a standard BNC
plug. When the box is plugged into to the input of an oscilloscope with a 50-ohm
termination resistor, it can detect light pulse frequencies beyond 100MHz.
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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.
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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.
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Clear Fluid Detector -2
Using an ultra low power technique, this circuit detects when a clear fluid is
inside a piece of clear plastic tubing. It can be used for fluid level control and
monitoring.
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Clear Fluid Detector
This circuit detects when a clear fluid is inside a piece of clear plastic tubing.
It can be used for fluid level control and monitoring.
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Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
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Across The Track Infrared Detectors - This page presents information on infrared
- 'Across The Track' train detection circuits. The circuits are designed around the LM339
quad comparator chip and can use a wide assortment of matched infrared - emitter /
detector pairs..…be sure to scroll down to view all the circuits.... [from Rob Paisley's
Model Train web site] |
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Across Track Detection - This page presents on infrared - 'Across The Track'
train detection circuits. The circuits are designed around the LM339 comparator chip and
can use a wide assortment of matched infrared - emitter / detector pairs. [from Rob
Paisley's Model Train web site] |
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Air Transparency Monitor, pg 1 - 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.... [Designed by David A. Johnson] |
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Air Transparency Monitor, pg 2 - This is Page 2 of the air transparency monitor
receiver circuit.... [Designed by David A. Johnson] |
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AN-32 Optical Design Of Ambient Light Sensor - Application Note Microsemi 1404
(added 05/06/07) |
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AN865: Sensing Light with a Programmable Gain Amplifier - Microchip Application
Note Published 28-Mar-03 (app note added 2/06) |
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Basic Infrared Proximity Detector - The circuits on this page are for an
Infrared Proximity Detector using the Vishay Electronics TSOP4830 "IR Receiver Modules for
Remote Control Systems"….Scroll down to view all the circuits…. [from Rob Paisley's Model
Train web site] |
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Basic Infrared Light Train Detection - In the circuit bellow the LED will turn
on when the infrared beam is broken. The value of the resistor R1 determines the
sensitivity of the phototransistor Q1. In most cases a value of 1 Meg or 470K ohm with
good results but every situation is different and some experimentation might be needed....
[from Rob Paisley's Model Train web site] |
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Battery Powered Sensor Detects Dangerous U Volt Radiation - 12/08/94 EDN-Design
Ideas....The battery-powered circuit in Fig 1 detects 295-nm UV radiation, which is
dangerous to eyes and skin. Be sure to protect yourself and your coworkers against this
radiation. To operate device, press switch S1 and hold it closed for at least 2.2
sec. A start pulse applied to IC4 starts 2.2-sec measuring cycle. Pin 3 of IC4
resets 4040 binary.... EDN is migrating links. This link is not verified.
Search the "title" + "EDN" for new link. |
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Block Occupancy Detector Helper Circuit information - This circuit would be used
to hold a BLOCK OCCUPIED condition as a train passes out of the block even if the normal
detector is not sensing a train. [from Rob Paisley's Model Train web site] |
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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.... [Designed by David A. Johnson] |
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Broad Band 50mhz Optical Fiber Receiver Version A - If the above circuit it
still too slow, you can try this circuit. What it lacks in sensitivity it makes up for in
speed. The circuit attaches a plastic fiber optic PIN photodiode assembly to a small box
containing a small 3v battery and a standard BNC plug. When the box is plugged into to the
input of an oscilloscope with a 50-ohm termination resistor, it can detect light pulse
frequencies beyond 100MHz.... [Designed by David A. Johnson] |
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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.... [Designed by David A. Johnson] |
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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.... [Designed by David A. Johnson] |
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Circuit rejects ambient light - 06/10/99 EDN-Design Ideas EDN is migrating
links. This link is not verified. Search the "title" + "EDN" for new link.
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Clear Fluid Detector-2 - Using an ultra low power technique, this circuit
detects when a clear fluid is inside a piece of clear plastic tubing. It can be used for
fluid level control and monitoring. …. [Designed by David A. Johnson] |
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Clear Fluid Detector-3 - This circuit detects when a clear fluid is inside a
piece of clear plastic tubing. It can be used for fluid level control and monitoring. ….
[Designed by David A. Johnson] |
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Clear Fluid Monitor - An optical technique seemed like the best choice for this
application. The simple circuit below works well but only when the light detector
can be shielded from bright ambient light. A visible red LED launches light pulses
through the side of the clear tubing and emerges at the opposite side. A
phototransistor forms a light detector. The circuit takes advantage of the lens
effect from any clear fluid inside the tubing. When there is only air in the tubing,
the light scatters and spreads out quickly before it reaches the phototransistor....
[Designed by David A. Johnson] |
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Color Sensor - Colour sensor is an interesting project for hobbyists. The
circuit can sense eight colours, i.e. blue, green and red (primary colours); magenta,
yellow and cyan (secondary colours); and black and white. The circuit is based on the
fundamentals of optics and digital electronics. The object whose colour is required to be
detected....added 10/05) |
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Light Detectors / Optical Sensors: #'s
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