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Radiometry


Colorimetry Chemistry Optical Metrology Chemometry

 

Transmission & Optical Metrology - for Filters, Films, Optical Components

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Optical Metrology
 
  • Measure %Transmission, Optical Density (OD), Absorbance, and Reflectance of films, filters, coatings, fibers, lenses and just about any optical element

  • Optical Metrology Systems include a mini spectrometer, light source, and a metrology accessory such as a reflectance probe or transmission fixture

  • Systems available for 190-2300nm wavelength range

  • Resolutions better than 1nm with high stability research grade optical performance and repeatability


Spectrometers for Color Measurement
The most commonly used instrument for the measurement of the optical performance of filters, films, and optical components is a spectrometer. Easily measure %Transmission, Optical Density (OD), Absorbance, and Reflectance of just about any optical element for purposes of R&D, quality control, production, or simply to better understand your system.

Using a StellarNet fiber optic spectrometer coupled to a reflectance probe and fiber optic light source, it is possible to measure film thickness by detecting the sinusoidal fringe pattern from the samples specular reflectance. Choose between various StellarNet spectrometers to suite your Thin Film and/or optical measurement requirement. StellarNet offers model spectrometers that range from 190-2300nm. Dual channel configurations, extended range detectors, or high resolution optics can be employed to suite your optical measurement. See the StellarNet Thin Film Companion Software Page to learn more about film thickness measurements.


A fiber optic sample probe is powered with a fiber optic light source – SL1 tungsten krypton bulb (see other options below). For measuring the color of solid samples, an integrating sphere, such as the IC2, is used in place of the fiber optic reflectance probe to improve measurement consistency. The IC2 also acts as a cosine receptor to improve irradiance measurements. A white reflectance standard, such as the RS50 also listed below, is required to generate a reference for subsequent measurement of solid samples. For more information on color applications, refer to the section entitled ” Color Measurement Systems”.


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Transmission Sample Spectra  
   

Transmission Measurements of Neutral Density Filters. With a StellarNet optical metrology system you will never have to guess again.


Lens, filters, films, coatings, and plastics sometimes will have interesting characteristic fringe patterns in the far NIR. Be sure to test your samples!
 

RED-Wave-NIR-InGaAs – silver film for reference surface


Transmission spectra of various sun glass brands for color and UV blocking optical properties