Face Recognition Filters

Face recognition technology is a very complex technology. It scans the details of the human face skeleton and eyes optically and performs computer calculations and recognition. The role of the optical filter is to effectively eliminate the influence of external stray light, keep the recognition background in the same state, and ensure that each recognition is 100% correct.

The filter selection is different according to the infrared light source. Commonly used are 850nm infrared light source and 940nm infrared light source, which are the more mature LED light sources on the market.

Product features: Adopting the technology of all-medium hard film coating and the principle of medium interference, on the basis of highlighting the characteristics of narrow-band filter, the optical performance is related to the thickness of the substrate. The narrow-band filter produced by Nahong Optoelectronics is more convenient for built-in instrument imaging system. So that the optical performance can be improved and effectively applied, a special optical substrate is used to solve the problems of easy fogging and unstable optical performance of traditional absorption synthetic glass. The product is produced according to the customer's indicator requirements.

Optical indicators:

Center wavelength: 850+/-2nm

Angle of incidence: 0°

Full Width at Half Maximum: 25nm

Transmission at CWL: >90% (According to the customers'demand)

Product size: 3mm-80mm ( Square or round )

Cut off wavelength: 200nm-1100nm (According to the customers'demand)

Blocking: >OD4-OD6 UV-NIR

Product material: Optical grade glass (K9, BK7, B270, D263T, JGS1, color glass, float glass, etc.)

Surface quality: National standard level 3, US military standard 60-40

Application areas: biochemical analyzers, optical measuring instruments, enzyme markers, biometrics, infrared medical instruments, fluorescence analyzers, medical testing equipment, etc.