LASER TRANSMISSOMETERS

 

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Remote head may be mounted on tripod or custom fixtureGRAHAM'S 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.

The transmissometer 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.
Remote head may be mounted on tripod or custom fixture
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 is provided.

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.

LabView screen may show Transmittance T, %T and Optical Density OD
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

A telescope closeup below shows the location of the laser collimator tube.

One visible channel -- one infrared channel
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

3 Orthogonal channels --  infrared wavelengthAt 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.

Typical control console may be many meters from remote head.


 
 














GENERAL SPECIFICATIONS FOR LASER TRANSMISSOMETERS

FEATURES
BENEFITS
Wide selection of wavelengths available 30 wavelengths from 406 nm to 1800 nm
Test beam ~27 mm diameter or larger Collimated Beam Path to retrotreflector 
            3 to 10 meters for short path systems.
            10 to 4000 meters for long path systems
Console Readouts 4-1/2 digit LED or LCD Readout  (+/- 0.1% accuracy)
Multiple channels available 
Parallel axes or random direction axes
Orthogonal axes
Visible, IR, or assortment of visible and IR
As many as required
Up to three
Remote Optical Heads Up to 10 meters from Transmissometer Console
Bench Top Console
Rack Mounted Console
Console enclosed in rugged mounting for protection against the elements
Customer's choice
Analog output for each channel Data Acquisition module
Computer configured for Transmissometer Communicates directly with LabView 
Standard limited warranty on parts and labor 1 year
Power:  117 volts 60 Hz or 220 Volts 50 Hz Configured for customer's location.
For Further Information, call Gordon Graham today at (818) 700-1263  E-Mail: techinfo@grahamoptical.com
Graham Optical Systems,  9530 Topanga Canyon Blvd.,  Chatsworth, CA 91311
Copyright © 2016 Graham Optical Systems  All Rights Reserved     This page last updated July 16, 2016

LabView is Trademark of National Instruments