Interference Filters
Industrial grade wide band pass interference filters
 |
|
Coherent now offers Wide Band Pass Industrial Grade Interference Filters, especially suited for machine vision applications. These filters are ideal for imaging wide angle structured light patterns because the angle at which light impinges upon a filter greatly affects how it performs. A common error is selecting a filter with a band pass that is too narrow.
Made with non-hydroscopic films, these filters have much improved longevity in harsh environments compared to standard “off the shelf” soft hydroscopic film filters, which begin to degrade after as little as one year. Coherent’s Wide Band Pass Interference Filters have an anticipated working life in excess of five years.Angle of incidence and blue shifting
The center wavelength of the filter will shift toward shorter (blue) wavelengths as the angle of incidence increases; the greater the angle the greater the shift. This is known as blue shifting.
Available band pass (@ FWHM)
20 nm (0 to 15° angle of incidence)
40 nm (0 to 25° angle of incidence)
70 nm (0 to 35° angle of incidence)
Available center wavelengths
532 nm, 635 nm, 660 nm, 670 nm, 680 nm, 685 nm, 780 nm, 810 nm, 830 nm
Bandwidth tolerances
20 nm + -2
40 nm + -8
70 nm + -14
Center wavelength tolerances (dependent on bandwidth)
+2/-2
+5/-5
+10/-10