Phosphoroscope
The Becquerel phosphoroscope (1873-1874)
A phosphoroscope is piece of experimental equipment devised in 1857 by physicist A. E. Becquerel to measure how long it takes a phosphorescent material to stop glowing after it has been excited.[1]
It consists of two rotating disks with holes in them. The holes are placed on each disk at equal angled radial lines and a given distance from the centre but they do not align with each other. A sample of phosphorescent material is placed in between the two disks. Light coming in through a hole in one of the discs excites the phosphorescent material which then emits light for a short amount of time. The disks are then rotated and by changing their speed the length of time the material glows can be determined.
References
- ↑ "Natural Philosophy Collection. Bequerel's [sic] Phosphoroscope". University of Aberdeen. Retrieved 2014-12-16.
External links
 |
Wikimedia Commons has media related to Phosphoroscope. |
This article is issued from Wikipedia - version of the 12/16/2014. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.