Optical head for e.g. missile discharge detector of aircraft, has fish-eye type optical device, with large angular coverage and high total transmittance, included in structure having low reflection coefficient

摘要

The head has a bitmap detector (5) that is sensitive in a spectral band (1R2), with a band width lesser than one micron, centered on a pre-determined value X0. The detector operates with a high frequency at 20 hertz. A fish-eye type optical device (10) presents an angular coverage greater than 140 ?0 x 140 ?0, and has a total transmittance greater than 70 percentage. The device is included in a structure whose reflection coefficient is lesser than 10 percentage.