Application analysis of near-infrared illuminators using diode laser light sources

摘要

We describe a new class of eye safe near infrared (~810 nm) illuminators based on diode laser sources. These illuminators are the most efficient available by a large margin. We show examples of how the high output allowed by lasers can be used to illuminate very large areas and improve images in difficult lighting situations. We also show examples of how the narrow specral band of laser light can be used with filtered cameras to achieve unique results in applications such as facial recognition in open daylight. Application data on effective ranges and other factors are presented. Comparisons are made with other lighting systems such as arc lamps, tungsten lamps and light emitting diodes. We also compare results of systems that operate without supplemental light such as intensified cameras and thermal infrared cameras.