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(一)前言 众所周知,夜视仪器最基本的要求是看得远、看得清。夜视仪器中主要的部件除光学透镜外就是微光管。而光阴极则是微光管的“眼睛”。目前,二、三代微光管中的光阴极分别为Sb-K-Na-Cs与GaAs,它们的长波阈约为0.9μm。夜天空辐射强度是满月与星空交替变化的。满月以可见光辐射为主,而星空则以近红外辐射为主。在星空辐射下,波长大于1μm的辐射强度比可见光的辐射强度约大1—2个数量级。因此,Sb-K-Na-Cs与GaAs两种光阴极用于微光管内接收夜天空辐射,对满月是可以的,但是对波长长于0.9μm
(A) Preface As we all know, the most basic requirement of night vision equipment is to see far, see clearly. Night vision equipment in addition to the main components outside the optical lens is a small light pipe. The cathode is the “eye” of the light pipe. At present, the photocathodes of Sb-K-Na-Cs and GaAs in the second and third generation of microtubes have a long-wave threshold of about 0.9 μm. Night sky radiation intensity is the full moon alternating with the sky. The full moon is mainly visible radiation, while the star is near infrared radiation. Under starfield radiation, the radiation intensity of wavelengths greater than 1 μm is about one to two orders of magnitude greater than that of visible light. Therefore, Sb-K-Na-Cs and GaAs two photocathodes were used to receive night sky radiation in the light pipe, which is acceptable for the full moon, but the wavelength longer than 0.9μm