Diffusor für AmbientLight Bricklets

[yvo]

Hallo TinkerUnity

Für die Messung der Lichteinstrahlung auf eine bestimmte Fläche werden 9 Stück AmbientLight Bricklets eingesetzt (3x3 Raster). Die Bricklets sind aber sehr stark in eine Richtung orientiert. Um dies etwas abzuschwächen, würde ich gerne jeweils einen Diffusor montieren.

Mit schwebt dabei eine Halbschale vor, wie sie für übliche Belichtungsmesser oder Luxmeter verwendet werden (siehe angehängtes Bild).

Frage:

• Trotz langer Suche habe ich keine solche Diffusoren zu kaufen gefunden. Hat jemand eine Idee oder einen anderen Ansatz dafür?

Freue mich auf jeden Hinweis.

Mit den besten Grüssen,

Yvo

[Superp]

Some ideas:

Kenko KFM-200 Flat Diffuser for KFM-1100

Kenko Sphere Diffuser KFM-300 for KFM-1100

flash diffuser dome

ping pong ball diffuser

Pyrasied optical plastics

Polyacetal 

bearbeitet January 5, 2023 at 21:25 von Superp
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[yvo]

@Superp thank you very much for all the hints and ideas. Especially, the Ping-Pong-ball diffuser! That is just a great hint.

[Superp]

You're welcome. Now everybody is wondering what kind of project involves 3x3 light sensors.

[yvo]

It is used to measure the light-distribution of different LED-spotlights within a distance of around 1m. The sensors are distributed as grid and using Python and matplotlib, the measurements are plotted as animated graph to show the light distribution. The requirement for the spotlights is an uniformly illumination as possible.

The spotlights are later used for a photogrammetrical measurement setup within a cutter-head of a tunnel-boring-machine. For this reason, the illumination has to be as uniform as possible to prevent a light-concentration at the center of the images.

[Superp]

Wow, sounds cool. Thanks for the exposé. I would be careful not to introduce another variable factor through difference in density/composition/thickness/texture/orientation of the diffusers, but you no doubt have realised that already.

Best!

[yvo]

Yeah, I am just running a calibration of all the sensors using the diffuser and a single reference. Works well and I get the individual differences of the ambient-light sensors corrected.

For this purpose, I am using a halogen-lamp dimmed by an analog-out bricklet between 0V and 12V. After each step in- or decreasing the voltage, the measured value of the ambient-light sensor is stored in combination with the voltage.