LED illuminator #62-760

telecentric

TECHSPEC® Telecentric Backlight Illuminators use the optical design principal of telecentricity to illuminate objects with truly collimated light and produce high contrast, silhouetted images. Standard backlights are diffuse to avoid hot spots, but these diffuse reflections can also reduce edge contrast. TECHSPEC® Telecentric Backlight Illuminators have collimated light rays (not diffuse) to increase edge contrast, thereby increasing measurement accuracy. Used in combination with a telecentric imaging lens, these illuminators are ideal for machine vision applications that require accurate measurements and are compatible with 8mm coaxial LEDS or ¼" (0.312") fiber optic light guides. Optically Collimated Light for Increased Edge Contrast Superior Collimation Ideal for use with Telecentric Lenses Easily Compatible with 8mm Coaxial LEDs or ¼” (0.312”) Fiber Light Guides Why Use Telecentric Illumination? Increased edge contrast compared to conventional backlight illumination Ideal for precise measurement applications Superior detection of small defects, measurement accuracy, and repeatability Increased distance between illumination source and object Importance of Numerical Aperture (NA) Matching Matching the NA of your illumination source and imaging lens maximizes the efficiency of a system Artificial vignetting is introduced if the illumination source NA is smaller than the imaging lens NA Underfilling the imaging lens reduces contrast and results in a loss of object information Overfilling the imaging lens throws away some light, but is preferable to underfilling