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一、概述利用夜视象增强器进行夜间观察,要达到良好的观察效果,基本上应满足下列三个条件: 1.仪器的光谱响应范围应较宽。因为夜空辐射的光子通量随波长增加,波长大于1微米的光子通量比可见光区的光子通量大得多,因此,应要求光电阴极从可见光直到近红外区的光谱范围都很灵敏。 2.仪器应有高的量子效率。如S—25光阴极在0.4—0.7微米响应波长内,大约有10％的量子效率,峰值时可达25％。
I. Overview The use of night vision enhancer for night observation, to achieve good observation effect, basically should meet the following three conditions: 1. Instrument spectral response should be wide. Because the photon flux of nighttime radiation increases with wavelength, the photon fluxes with wavelengths longer than 1 micron are much larger than the photon flux in the visible region. Therefore, it is required that the photocathode be sensitive to the spectral range from visible light to the near infrared region. 2. The instrument should have high quantum efficiency. For example, the S-25 photocathode has a quantum efficiency of about 10% at a wavelength of 0.4-0.7 μm and a peak of 25%.