How can I measure the visible light transmission of sunglsses lenses (using a spectrometer)?

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Deanna Badi

Hello Kay,

Thank you for your detailed answer. What is the most accurate way to calculate the ratio of of the two spectra?

Thanks again,

Deanna

Ronny Errmann

Hi Deanna,

This depends on what you want to achieve with your transmission measurement:

Dividing the transmissions for each wavelength step would give the transmission spectrum, however, this would also have the highest noise. In that case I would repeat the measurement at least 3 times to gain more clarity what features in the transmission are real.

Before calculating the ratio you could run a rolling average or median over the spectra to smooth out the noise between wavelength steps

Before calculating the ratio you bin your spectra into large wavelength steps, e.g. 50 or 100 nm.

Best reagrds,

Ronny