Hemispherical projection lens for insect behavior analysis

Mika Aikio, J. Takalo, M. Lempeä, M. Vähäsöyrinki

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


Virtual reality projection systems have been used formerly to study if mammals, including humans, are able to act in or understand virtual environments.
Insects have been more difficult to study in such circumstances, one of the factors being their large, almost hemispherical field of view. Designing such a projection system that is capable of fulfilling the full field of vision of an insect is a challenging task.
Normally, when designing a photographic objective, one of the goals is to minimize field curvature in order to provide sharp image through the whole sensor surface. However, because the image surface in this case is a sphere, flat field is not desirable and the design task becomes an opposite of a typical camera lens. Introducing field curvature becomes mandatory.
We have designed and built a system with satisfactory image quality throughout the whole spherical surface with reasonable number of lenses as an add-on for common digital projectors.
The manufactured system is able to project an image to a solid angle of 11.95 steradians, and when compared to the whole sphere which is represented with a solid angle of 4π steradians, approximately 5 % of the total sphere area is not illuminated.
Original languageEnglish
Title of host publicationProceedings of SPIE
Subtitle of host publicationOptical Modelling and Design
PublisherInternational Society for Optics and Photonics SPIE
ISBN (Print)978-0-8194-8190-0
Publication statusPublished - 2010
MoE publication typeA4 Article in a conference publication
EventOptical Modelling and Design - Brussels, Belgium
Duration: 13 Apr 201015 Apr 2010

Publication series

SeriesProceedings of SPIE


ConferenceOptical Modelling and Design


  • Hemispherical projection
  • Insect behavior research
  • Tailored field curvature
  • Virtual reality


Dive into the research topics of 'Hemispherical projection lens for insect behavior analysis'. Together they form a unique fingerprint.

Cite this