Helicopters in low-level flight are endangered by power lines or telephone wires, especially when flying at night and under poor visibility conditions. In order to prevent 'wire strike', Thomson has developed a lidar system consisting of a pulsed diode laser emitting in the near infrared region (lambda = 0.9 microns). The HOWARD (Helicopter Obstacle Warning and Detection) System utilizes a high repetition rate diode laser (PRE = 20 KHz) along with counter-rotating prisms for laser beam deflection with a total field of view of 30 degrees. This system was successfully field tested in 1991. HOWARD can detect one inch wires at ranges up to 200 meters. We are presently in the process of developing a flyable compact lidar system capable of detection ranges in the order of 400 meters.
Cable Detection Lidar System for Helicopters
1992
4 pages
Report
Keine Angabe
Englisch
Infrared & Ultraviolet Detection , Avionics , Aircraft equipment , Aircraft hazards , Collision avoidance , Flight safety , Helicopters , Optical radar , Safety devices , Transmission lines , Warning systems , Detection , Laser beams , Near infrared radiation , Pulsed lasers , Semiconductor diodes , Semiconductor lasers , Foreign technology
A cable detection lidar system for helicopters
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