Knight Optical, a supplier of precision optical components, has expanded their range of stock colored longpass, shortpass and bandpass glass filters.
Color glass filters are manufactured by injecting colored dye into a glass substrate. The dye gives the filter its color and spectral performance. In this respect, color glass filters are simple, stable optics and can be used in a range of applications, but are often limited by the colors available. Knight Optical now stocks a selection of alternative filters to meet the requirements of applications with operating wavelengths outside of those provided by standard color glass filters.
Colored glass filters are often used for applications such as:
Laser Range Finders – range finders use a laser beam to be able to determine the distance of an object. Laser Range Finders are most typically operated on the principle of sending a laser pulse in the form of a narrow beam towards the object of interest and then measuring the time taken for the laser pulse to be reflected off of the target in question and received by the sender. Knight Optical offers Color Glass Filters for such an application, be it either short pass, long pass or bandpass filters. We can also offer these as customized filters with specific band blocking coatings to optimize your wavelength of choice.
CMOS sensors – CMOS sensors are extremely sensitive to IR light, which can lead to discolouration. IR cut filters are used to block the IR light, meaning that photographs are taken with life-like colours. Colour Glass Filters can be used in variations of Bandpass, Long pass and Short pass, depending on which wavelengths of light need to be blocked resulting in different key areas being more easily distinguished.
Knight Optical offer stock and custom color glass filters, for use within IPL (Intense Pulsed Light) in a range of materials from brands such as Schott, Kopp and CDGM.
Inline Cameras – color glass short pass filters are more desirable as they cut out IR wavelengths, so the image is not saturated with IR which gives better clarity.
ANPR cameras – the wavelengths typically used by ANPR camera companies are: 695nm; 740nm; 810nm; 850nm; 910nm and 940nm.
Knight Optical hold an extensive inventory of Bandpass, Long pass and Short pass glass filters, with stock sizes of 25mm diameter, and 50x50mm squares x 3mm thick. Custom shapes and sizes are also available, along with alternative thickness substrates.
All our Color Glass Filters are checked for quality in our state-of-the-art Metrology laboratory using our Varian Cary 5000 spectrophotomer’s fitted with UMA, allowing us to work to the highest QA standards and meet the tolerance specifications on these precision components.