LED’s are used in a multitude of applications from low cost consumer lighting to expensive medical diagnostic systems. LED’s are not monochromatic and can vary in output wavelength position and profile as a result of manufacturing tolerances, operating conditions and age. Filters are used to fine tune and stabilise the output such that the characteristics remain optimised and constant over long periods of time.
Consequently the filters must be shift free and environmentally stable under harsh conditions. Typically the filter types are Longpass, Shortpass or Bandpass in design covering an ever increasing range of wavelengths in the UV, Visible and NIR.
Biotechnology, ANPR and Signal lighting are just a few of the many areas in which LED’s are used.
All of these Filters are hard, durable and environmentally stable and can therefore be produced in a variety of shapes and sizes. This final sizing step is carried out at Envin where finished filters are produced from 1mm square to >100mm diameter. Thickness can be as low as 0.2mm and special considerations such as flatness and parallelism are routinely catered for.
Detailed Optical performance measurements are made using the highest standard Spectrophotometers (Perkin Elmer Lambda 900 & 983G).
Envin is able to offer a complete service from Coating and Filter design to prototyping and full manufacture covering the Ultraviolet, Visible and Infrared regions. Custom products are a speciality of the company.
