LASER TRANSMISSOMETERS are available in
several formats with ranges from a few meters to a few kilometers. Multiple
channel instruments can be provided at a number of wavelengths, visible
and Infrared, which may be chosen at time of purchase.
A typical Short Range
intsrument with remote optical heads is usually tripod mounted as shown
in the image at the left. This optical head consists of two collimator
tubes (one for each wavelength) and two detector tubes. These heads
are connected by cables to a control console which permits calibration
as well as presenting percent Transmission on digital readouts.
utilizes chopped laser beams which are directed toward a retroreflector
or corner cube which reflects the beam back to the detector. The
circuitry does not recognize ambient lighting conditions so the instrument
may be operated in full daylight.
For longer ranges (~100 meters to a few
kilometers) an astronomical telescope is used to collect the retroreflected
beam. Although the chopped laser beam is collimated, considerable
spread is produced at longer distances. Hence the telescope's ability
to collect more light is very important.
The telescope also assists in the alignment
of the system by permitting the operator to visually sight the retroreflector
through the telescope. For greater distances a larger aperture telescope
For longer distances we reccomend our computerized
Laser Transmissometers which put the control of the instrument under National
Instruments' LabView Software.
As well as permitting the computer to
control the transmissometer, it also presents graphic displays of
Percent Transmission (%T), Transmission (T) and Optical Density (OD), as
well as several expanded range displays. These instruments are also
capable of automatic storage of transmission information over extended
periods of time, thus permitting analysis at a later time.
A telescope closeup below shows the location
of the laser collimator tube.
the left is a 3-channel infrared transmissometer with orthogonal alignment
of the channels, thus permitting measuremnt of the local atmosphere along
X, Y, and Z axes. Below are typical embodiments of the Control Console.
Typical Rack-mounted Console
This Console for a 3-channel
Tranmsissometer is installed in weather-proof Pelican Case*
-- highly advisable for
systems exposed to the elements.
This one is intended for desktop use in a protected environment.
GENERAL SPECIFICATIONS FOR LASER TRANSMISSOMETERS
Further Information, call Gordon Graham today at (818) 700-1263 E-Mail:
selection of wavelengths available
wavelengths from 406 nm to 1800 nm
~27 mm diameter or larger Collimated Beam
3 to 10 meters for short path systems.
10 to 4000 meters for long path systems
digit LED or LCD Readout (+/- 0.1% accuracy)
axes or random direction axes
IR, or assortment of visible and IR
many as required
to 10 meters from Transmissometer Console
enclosed in rugged mounting for protection against the elements
output for each channel
configured for Transmissometer
directly with LabView
limited warranty on parts and labor
117 volts 60 Hz or 220 Volts 50 Hz
for customer's location.
Optical Systems, 9530 Topanga Canyon Blvd.,
Chatsworth, CA 91311
© 2016 Graham Optical Systems All Rights Reserved
This page last updated July 16, 2016
is Trademark of National Instruments