Infrared ink identification with 940nm infrared ink identification filter advantages: 1. suitable for strong light (sunlight) with interference; 2. Transmission rate of up to 80%, instrumental light attenuation coefficient is small, effectively improve the working distance and light intensity, to make up for the instability of the LED940 infrared lamps; 3. the actual cut-off rate is high, vertical incidence in the strong infrared lamps with no penetration, the OD is greater than 5; 4. 30 ~ 50nm half-bandwidth, single-sided full dielectric rigid film, with a dual-function effect, can be back glued and sleeved into an ultra-narrow band biochemical fluorescent microscopy filter, OD value can be enhanced. 50nm half-bandwidth, single-side full dielectric hard film, with dual-function effect, can be glued on the back side with a sleeve into an ultra-narrow-band biochemical fluorescence microscopy filters, OD value can be increased to 8. Application areas: Nahong 940nm narrow-band filters can be used in infrared ink recognition, fluorescence analysers, iris recognition, infrared medical instruments, laser rangefinders, mobile phone barcode scanners, and so on.
Optical characteristics of infrared no black identification filters:
Centre wavelength: 940nm±2nm
Centre wavelength transmittance: >90%.
Half bandwidth: 20nm
Cut-off area: 200nm～870nm, 990nm～1100nm
Cut-off rate: T＜0.1 per cent

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