To choose an optical filter for machine vision, start from the illumination spectrum rather than the filter catalog. Match the filter passband to the light your system actually uses, then verify that the passband still lines up once you account for the range of angles…
A narrowband optical filter improves LiDAR signal-to-noise ratio primarily by reducing the amount of broadband ambient light that reaches the receiver detector while preserving the wavelength of the returned laser pulse. The principle is straightforward, but the engineering trade-off is not: making the passband narrower…
An ambient light rejection filter for a time-of-flight sensor is a narrow bandpass interference filter placed in the receive path that transmits the illuminator wavelength, normally 850 nm or 940 nm, and blocks everything else across the detector’s spectral response. It matters because time-of-flight (ToF)…
