Thin-film luminescent concentrators for position-sensitive devices.

The output emittance at the edge of a luminescent concentrator (LC) depends on the physical properties of the dye and matrix used, the spectral intensity of the incident light, and the geometric parameters of the LC. If a projection of the light source on a LC is smaller than its aperture, the LC's output signal will also depend on the position of the projection. This LC feature opens the possibility of determining the position of the light spot and thus building a new type of position-sensitive device.

Applications of neural networks to colour recognition.

Colour specification and matching are important tasks used in a number of different industries. However, current methods can employ very complicated, elaborate pieces of laboratory equipment which are not portable, such as spectrophotometers with combinations of calibrated light sources and a large number of narrow band filters. Simpler, portable devices are typically not sophisticated enough to give a high degree of quality control due to the less sophisticated light sources and the necessarily smaller number of filters employed.

Modeling a variable-focus liquid-filled optical lens.

Research has been conducted on a variable-focus liquid-filled optical lens built from a polymer elastic-film window and a rigid plastic window with a transparent refractive liquid between these windows. The pressure inside the lens deforms the elastic film, which takes the form of a paraboloid. The absolute value of the tension in the film was calculated, allowing theoretical evaluation of the focal length of the lens and its aberrations.