| 摘要 |
PURPOSE:To make it possible to discriminate the plural targets of different radiative spectra by using a chopper blade which is formed with such regions as allow a plurality of different infrared ray spectra to pass therethrough. CONSTITUTION:A chopper blade 30 is formed with synchronous signal generating patterns 33, 34 and so on and with filters 31, 32 and so on having different spectral regions for allowing infrared rays to pass therethrough. The infrared radiative ray having been chopped to pass by the blade 30 is received by photoelectric element or the like and is separated in accordance with the synchronous signals which are generated by the light receiving signals of the rays having passed through the patterns 33, 34 and so on. Then, even if the plural targets of the spectra are adjacent to one another, it is possible to accomplish the target discrimination. |
