GRAHAM 
  TRANSMISSOMETERS

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  Transmissometer

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  Transmissometer

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  Transmissometer

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  Transmissometer

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  Transmissometer

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The test piece may be a small piece of glass, a film being vacuum coated, a small vial of liquid, a large vat of liquid, or the atmosphere itself over some specified distance -- perhaps a kilometer or more. So the term "Transmissometer" does not offer many clues to the type of instrument required -- a Transmissometer is truly an "application-driven" instrument.
 

Test Piece or Substrate	Transmissometer Type	Special Features
Small sample of solid material Glass, Plastic, Filter, Film, etc., Measured in the atmosphere Usually for QC application	Bench Type (self-contained optics) Remote Head (special size samples) Single or multiple wavelengths	Compact self-contained optics. Remote head (special geometries) Single or multiple wavelengths
Moving Web in the atmosphere Typically for Process control and QC	Remote Head configured to web size	Custom remote head with one or more channels to monitor transmittance across width of web.
Moving Web in High Vacuum TYpically for Process Control and QC	High Vacuum Remote Head configured to web size	Custom remote head configured for installation in High Vacuum chamber. Single or multiple channels to monitor Transmittance of web during coating process.
Liquid samples in plastic, glass or fused silica cuvettes Usually for laboratory environment	Bench Type (self-contained optics) Remote Head (special size samples) Single or multiple wavelengths	Compact self contained optics configured to adapt to cuvette type in use.
Liquid samples in large vats or tanks	Remote Head configured for each particular application. Single or multiple wavelengths	Sealed Remote head  Submersible in non-corrosive liquids Configured for the application.
Gases in long path vessel	External head configured to vessel	Usually in the near infrared (700 to 1000 nM wavelength) Critical components sealed against corrosive gases.
Atmosphere over hundreds or thousands of meters. Typically to measure air quality or to detect smoke from forest fires.	Remote optical head usually single wavelength.	Optical head with remote corner cube reflector to make double pass through atmosphere.

Graham Optical Systems manufactures a wide range of transmissometers and can configure one specially for your application.  All of these instruments perform in full ambient lighting conditions -- no need to make the measurements in the dark. We can help with your selection of the appropriate Transmissometer for your application.