[hornychz]

What is the benefit of a JGS1 half ball hemispheres compared to a flat piece of JGS1? Do you get improved cosine response? Are you also using some kind of diffuser between the JGS1 and the UV sensor?

Hi ctnxs1,

Unfortunately, at this moment still can not answer ... (Whole summer, we had to "watch" a little granddaughter and I had no time to almost nothing. Now to catch up on my contracts, because my customers have everything they want to complete ...)

According to yet gained experience, but I think or know now:
- half ball hemisphere focuses light, perhaps too, probably would have been preferable hollow half ball hemisphere
- spherical curvature possibly eliminates cosine effect better than a flat plate with bevelled flanks ramp UVI measurement appears to be similar to the "official" measurement
- JGS1 has excellent UV transmittance around 92%
- light reflection is minimal
- hemispherical shape with virtually no pollute, the sensor is always squeaky clean

For these reasons, I find these filters for itself in perspective.

But, there are some problems:
- at this moment (all summer), I have not another instance CumulusMX to properly record the measured graphs (all the parts lying on my table)
- I've poorly glued (sealed) test filter, so I'm under it 2x allow water sensor, and then a few days did not measure
- test sensor is still in my garden on a table where the afternoon shadow, and I have not had time to put it on the roof

And even answer your question:
- no, there is no diffuser between the hemispherical JGS1 and sensor UVM30A

I am sorry that I have not progressed further, but that's just life ...

Regards