| CPC H02S 50/00 (2013.01) [G01N 21/59 (2013.01); G01N 25/56 (2013.01); H02S 40/30 (2014.12); H02S 50/15 (2014.12); H10F 19/804 (2025.01)] | 7 Claims |

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1. A method, comprising:
exposing a photovoltaic module comprising a first polymer layer between second and third polymer layers to ultraviolet light;
measuring a transmittance of light in the first polymer layer using a first optical sensor disposed in the first polymer layer at a first position; and
calculating a change in transmittance relative to a transmittance of the first polymer layer prior to ultraviolet light exposure.
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