rotation speed of radiometer and wavelength

[BKarim]

hi, how does a radiometer reacts to the different wavelengths ?
will the rotation speed for a given output power be the same for different wavelengths ?

and for a given wavelenth, can you evaluate the output power thank to the rotation speed ?

 

[Zeroignite]

Do you mean a Crookes Radiometer?

 

[Cyparagon]

No. It seems to be a carbon-based coating, so just about anything that passes through the glass will be absorbed equally. Also, different bulbs seems to have different vacuums. Mine for example doesn't turn unless it's in full sunlight or a class 4 laser beam. About all you can do is infer which light source is more powerful, but not by how much.

 

[BKarim]

but if you know the output power of one laser, maybe you can evaluate the power of the other lasers with the rotation speed...

 

[Cyparagon]

Like I said, it's not linear.

 

[qumefox]

It's possible, after getting above the threshold that makes it rotate. However it would have to be calibrated. Meaning you'd have to test it with a range of known wavelengths and known powers.. Which means you should just break down and spend $100 on a real LPM.