| CPC H02S 50/15 (2014.12) [G01N 21/6489 (2013.01); G02F 1/0147 (2013.01); G01N 2021/6471 (2013.01); G01N 2201/0686 (2013.01); G02F 2203/055 (2013.01); G02F 2203/11 (2013.01)] | 27 Claims |

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1. A method for measuring a photoluminescence response from an object, the method comprising the steps of:
(i) exposing the object to solar irradiation to generate photoluminescence from the object; and
(ii) measuring a signal from the object in a spectral band selected such that at least 20% of the measured signal comprises photoluminescence generated from the object by the solar irradiation,
wherein the object comprises a photovoltaic module comprising a plurality of silicon photovoltaic cells.
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