Bi940-58 | Bi940 Near-IR Interference Bandpass Filter

The MidOpt Bi940-58 filter is meant for use with IR LED or laser diode illuminators that operate at or very close to 940nm. Bi940 filters feature a much narrower band design than BN940, which can be beneficial in situations where ambient light might otherwise create poor contrast. These are frequently night vision, security, traffic control, LPR, and industrial inspection applications. NIR image sensors used in conjunction with 940nm illumination are also being used to support iris recognition in biometrics. When used as a secondary scanner (simultaneously with a primary, mobile scanning unit), the invisible 940nm band can similarly help improve finger-vein identification protocols. This technology identifies specific individuals using a distinct blood vessel pattern inside one’s hand. Use of a narrow-band Bi940 filter can provide insurance against unanticipated changes in ambient/background light. One application under development is to verify users for payment transactions instead of relying on a credit card. All MidOpt filters can also be purchased unmounted or in custom dimensions upon request from Machine Vision Direct.