Re: "Colorimeter"

On 5/18/2025 4:22 AM, Theo wrote:

Don Y <blockedofcourse@foo.invalid> wrote:

Not quite, but, close enough...
>
How can I determine the spectrum of incident light on a sensor,
in general?  Then, how many corners can I cut to sacrifice resolution
and accuracy?

 How broad and how much resolution?

I've not been read into those details.  It's unclear if they are *known*
or being withheld (as they know I'm not interested in any more work; why
disclose information that you don't have to?)

 There are sensors, eg:
https://ams-osram.com/products/sensor-solutions/ambient-light-color-spectral-proximity-sensors

Thanks, I will pass that along.

versions of which can be found in cheap dev boards:
https://shop.pimoroni.com/products/as7343-breakout?variant=41694602526803
 I'm sure I remember reading recently of a consumer grade multispectral
camera part with a moderate resolution (something like 8x8 or 32x32) but I
can't find a reference to it now.  But it seems there's a phone launching
with such a camera soon (according to rumours):
https://www.gizmochina.com/2025/05/13/huawei-nova-14-series-to-launch-in-may-with-harmonyos-5-and-an-ultra-model-specs-here/

That would target a different application (IMO).  As presented to me, they're
just looking for characterizing the light falling on a *spot*.  If
different (e.g., bandwidth sensitive) detectors were employed AT that
spot, I would assume they would have to be treated as a single point
(despite there being some obvious separations involved in their manufacture)
I.e., almost like a photographer's "light meter" but with the interest
being on the spectral content and not the overall intensity.
[Whether this is true or not, it has influenced how *I* have thought
about the problem -- in terms of function, size, portability, power
requirements, etc.  Assumptions are always the bane of a good design...  :< ]