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<a href="http://community.silabs.com/t5/Welcome-and-Announcements/Community-Ranking-System-and-Recognition-Program/m-p/140490#U140490"><font color="#000000"><font size="2">Star</font></font> </a> dsj
Posts: 3
Registered: ‎02-11-2017

Si1133 - total irradiance

I'm looking for best practice for measuring total irradiance (aka radiant-flux) incident on the Si1133. Does the White sensor respond to the full spectrum from UV to IR? Or should values from the UV, IR and WHITE photodiodes be integrated into a single value? Is it a simple conversion from ADC counts to W/m2? I've looked through all documentation and posts on this forum relevant to Si1133 (and Si1132) and could not find any discussion of this application.


Thanks!

Posts: 50
Registered: ‎04-09-2015

Re: Si1133 - total irradiance

Hi,

 

Did you create the ticket in our technical support system asking the same question? If so, please see the response in ticket 00131419.

 

Regards,

Tony

<a href="http://community.silabs.com/t5/Welcome-and-Announcements/Community-Ranking-System-and-Recognition-Program/m-p/140490#U140490"><font color="#000000"><font size="2">Star</font></font> </a> dsj
Posts: 3
Registered: ‎02-11-2017

Re: Si1133 - total irradiance

Hi Tony. Yes, I did create that ticket and have been interfacing with an AE over there. Tried to delete this thread but couldn't figure out how. Please delete it if you can, I'm all set. Thanks!

Posts: 2,968
Registered: ‎02-07-2002

Re: Si1133 - total irradiance

Instead of deleting this post, why not tell the rest of us out here what the answer was? Or is this a 'secret'?

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<a href="http://community.silabs.com/t5/Welcome-and-Announcements/Community-Ranking-System-and-Recognition-Program/m-p/140490#U140490"><font color="#000000"><font size="2">Star</font></font> </a> dsj
Posts: 3
Registered: ‎02-11-2017

Re: Si1133 - total irradiance

Ah, I didn't know anyone was listening! It's no secret, but it's not simple either, unfortunately.  We're in the process of testing a few different approaches against a high-quality (expensive) pyranometer, collecting lots of data in the hopes of developing a calibration curve that will give us a decent estimation of irradiance from sunlight. The key piece of info I got from the SiLabs AE was to check figure 8.5 of the Si1153 data sheet, which provides the spectral response of the ALS. Turns out the Si1133 and the Si1153 share the same photodiodes, which I had not realized. Good luck!