Bruce__H yup I agree with your point about quantifing the irradiance.
Especially the last point about the response
Regarding aperture I think he indicated that it was 1cm2 and centered on the 3mm by 1cm core.
Regarding placement. I asked him if for thermal and saturation reasons it is not in side the heat exchanger itself but rather outside but looking through a small window. He confirmed this. I think it reasonable to assume that window is 1cm^2
He also confirmed the spectrometer is inside the box and more distant from it. The box I think is about 45 cm wide and deep. So we can estimate the distance of the sensor from the core to be between 10cm and 20cm I think. At this distance we can treat it like a radial radiation from a point like source I think
If we ignore any other filters. This I think indicates between 5 and 20 W is passing into the spectrometer depending on its exact distance. I wonder if this amount of flux is reasonable or not?
Hmm I suppose it could also be looking through a pinhole window and still get the spectrum from 1cm^2 if suitably placed... so I’m not sure if that above estimate helps.... it might also serve as a pinhole camera of the contents though which would be cool.
I suppose the refresh of the video gives an indicator of the counts over a particular time frame.
I’m not sure how we could estimate the response though. Do you have any idea what is typical?