Measuring optical signals near the detection limit

Hello,

I’m using the OPT3001 in a optical scattering system to measure non-specular reflectance from smooth surfaces. The detected light is near the detection limit 1.2nW/cm-2. My calculations are showing a non-linear response at these levels of optical input. Please provide data showing the linear response of this device throughout its operating range. I know that it uses a log amp to measure across the 7 orders of magnitude of the Silicon response, but I’m hoping that the reported irradiance values are indeed correct even at low light levels.

Thank you,

Patrick