Bauernfeind prism
A Bauernfeind prism is a category of reflection prisms and is used to deflect the beam path by 45 ° to 60 °, depending on the construction, without tilting or rotating the image.
It is named after its inventor, the German geodesist Karl Maximilian von Bauernfeind .
The beam is reflected twice in the prism, whereby one of the reflections is steeper than the critical angle of total reflection , so the prism needs a mirror coating on this surface.
A Bauernfeind prism with 45 ° beam deflection is also known as a half-pentagon prism. A Bauernfeind prism can be combined with a Schmidt prism to form a Schmidt-Pechan prism .
Applications
The Bauernfeind prism is used in microscopes and geodetic instruments on the way to the eyepiece in order to make these devices more ergonomic.
More recent applications are glasses that direct the perspective either downwards (for relaxed reading or watching TV using sun glasses) or upwards (for observing a sport climber through safety glasses) .
credentials
- ↑ dorotek.de: Prisms
- ↑ Technology encyclopedia: Bauernfeind-Prisma
- ↑ edmundoptics.com: Half pentaprisms
- ↑ REHADAT aids portal: prism glasses, sun glasses, telescope mirrors