An apparatus spectral analyzer and direction indicator to receive a collimated or essentially collimated incident radiation.

摘要

A spectral analyzer and direction indicator and direction indicator (10,20) is disclosed and includes reflection gratings (13,15,25,27,37,39), associated optical systems (17,19,29,33,41,45) and associated detectors (21,23,31,35,43,47,30). The reflection gratings (13,15,25,27,37,39) are arranged to provided angles of diffraction which are utilized to determine spectral content and incidence direction of collimated or essentially collimated incident radiation.