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Planck and the light sensor
(03-21-2022, 09:10 PM)Jens Noritzsch Wrote: Please note that the “quality” (including rate and resolution) heavily varies between smartphones and infrared might get filtered (for some time, it was not possible to see the light of a remote on iPhones, for instance – however, there is no interface for the light sensor anyway:

Yes, you would have to know what sensor your phone has. In my case GT-I9300, but thanks to the excellent sensor database I can find out more about what the sensor can and cannot do:

CM36651 Light Sensor
Capella Microsystems
121240 lx
1.0 lx

The question here is whether that sensor can add information and/or measure data in the educational context of heat radiation and planck curves.

Clearly the CM36651 Light Sensor will "see" a fully shining 3.5 V small light bulb very well, but what if the light was filtered so that only 670 ± 5 nm comes through?

And if so, would that signal say anything meaningful in relation to the light bulb power (P=U*I)?

According to this fine graph just 0.5% of the total radiation power would come from 670 ± 5 nm at T=3000 K:

and even less would show as signal if the sensor indeed uses the Luminous efficiency function.

But it would be nice to know :-)

Best regards.


Messages In This Thread
Planck and the light sensor - by Erik Josefsson - 03-21-2022, 07:52 AM
RE: Planck and the light sensor - by solid - 03-21-2022, 08:14 AM
RE: Planck and the light sensor - by solid - 03-21-2022, 02:16 PM
RE: Planck and the light sensor - by Erik Josefsson - 03-26-2022, 07:11 AM

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