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Konferenzteilnahmen |
| Veranstaltung: |
17th Scientific-Professional Colloquium on Geometry and Graphics |
| VeranstalterIn: |
Croatian Society for Geometry and Graphics HDGG, Rastoke (Kroatien) |
| Zeitraum: |
04.09.2013 bis 08.09.2013 |
| Beschreibung: |
The sophisticated geometry of compound eyes and some applications in bionics
abstract:
Nature has evolved two major kinds of highly efficient eyes in t
he animal kingdom:
Lens eyes and compound eyes. The latter are characteristic f
or insects (on land) and
crustacean (in water). In general, the individual “ommatid
ia” (facets) of compound
eyes are basically hexagonal conic frustums. Some families
of crustacean (crayfish
and some shrimps), however, have almost perfect quadratic p
risms as ommatidia
which turn out to be of special interest for applications in b
ionics.
We investigate both kinds of ommatidia and try to explain the
effect of so-
called “pseudo pupils”. This effect already allows to classi
fy the different types of
compound eyes (Fig. 1, Fig. 2, [1]).
Surprisingly, crayfish-eyes work like sophisticated optic
al lenses [3, 5], although
they use a completely different method: Light rays are not ref
racted but reflected
several times at the reflecting faces of each ommatidium. Ama
zingly, a more or
less large amount of all passing light rays is thus bundled on
a concentric convex
(basically spherical) shape (Fig. 2).
The method of focusing light by means of large series of reflec
ting quadratic
prisms is currently being introduced to telescopes to explo
it tiny amounts of rays
(e.g., X-rays) from outer space [2], or even for new types of c
ameras [4]. |
| URL: |
http://www.grad.hr/sgorjanc/rastoke/ |
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