Measuring Through Materials

If the object or material you want to measure is more transparent, for instance a filter, glass, or fluid, the amount of reflected light is too low to perform a reflection measurement. For (mostly) transparent materials, transmission spectroscopy is the best choice, since it measures the light that passes through the material in comparison to the emitted light, instead of light reflecting from it.

To perform such a measurement, usually a parallel light beam is used while utilizing collimating lenses between the fibre optics of the setup. The object of interest is then placed between these collimating lenses to measure what light is transmitted through the material.

Example: UV Transmission

A great example of a transmission measurement is measuring through sunglasses to find out whether they completely block all UV radiation, as seen in the video below:

https://www.youtube.com/watch?v=lbDCa6LaiF0

Related Products

These are some of the products that can be used to perform a transmission measurement. To find the perfect setup for your specific application, contact one of our sales engineers for advice.

Application Examples

Below are some detailed application notes on various uses of transmission spectroscopy in different applications and industries.

Why choose Avantes for your transmission application?

  • Extensive knowledge on transmission applications
  • Large assortment of accessories including various transmission dip probes and stage
  • Fast and accurate measurements
  • Compact, versatile setup configurations for various transmission applications

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