Butterfly in a Geissler tube

Physikfan, Thu Nov 10 2016, 10:33PM

The two pictures show a butterfly in a Geissler tube (DC source):

Schmetterling1300x442

Schmetterling2300x249
Re: Butterfly in a Geissler tube
Proud Mary, Tue Nov 22 2016, 10:57PM

Rather special! smile
Re: Butterfly in a Geissler tube
Physikfan, Wed Nov 23 2016, 12:18PM

Hi Proud Mary

The pictures show the butterfly in a geissler tube in daylight.

Schmetterling3400x250
Schmetterling4400x235
Re: Butterfly in a Geissler tube
ScottH, Mon Jan 16 2017, 05:03PM

That is beautiful.
Re: Butterfly in a Geissler tube
Physikfan, Mon Jan 16 2017, 09:27PM

Hi Proud Mary and ScottH

The pictures show the butterfly in this Geissler tube in UV light.

P11904541400x445
ASA400, exposure time 1/20 s.

P11904571400x536
ASA400, exposure time 1/40 s.

Note the different colors for the two different exposure times.
At the lower exposure time the glass fluorescence is also almost invisible.
On the upper left is the UV lamp reflex, which looks with the naked eye really violet and not light blue as seen in the picture.

With the naked eye the reflex of the UV lamp looks really violet and not light blue as seen in the picture.