Optical Filters are used in imaging applications to introduce or improve contrast enhancement. The resulting images are used to discriminate between good and bad products or to identify manufacturing issues. Imaging can use different wavelength regions and detectors such as CMOS 300-1100nm, InGas 700-1700nm or Infrared 2-8 microns. Dual region techniques such as Visible and NIR are increasingly common.
Filters are typically Single Bandpass or Multiple Bandpass but can be Longpass or Shortpass according the specific requirements. In addition the filters can be used with Excitation sources to produce Fluorescence images.
Product sorting, Bar code identification, Security marker verification, NIR imaging, ANPR, and Thermal imaging are just a few application areas.
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.