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| 光電測量產品 >> 光譜系統 >> NVIS 夜視系統檢測系統 | |
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The human eye has, as we all know, very limited night vision (NVIS) capability. Night vision goggles (NVG) were developed for military applications to permit night- time missions under the cover of dark, with particular issues arising in their use in aircraft and other vehicles. In effect at night time, there remains a very low level of natural celestial illumination, the reflection of which from the landscape is imaged by the NVG. NVG are based on image intensifiers, whereby a photon of light, falling on a photocathode, liberates an electron. This single electron goes through an electron amplifer, the resultant electrons then falling on a phosphor screen. Using lenses to image the view of the user, one may obtain on the phosphor screen a typical green- black image of the landscape. It is Measurement for NVG compatibility are centred round two main themes, and are stated in document MIL-STD 3009 Lighting, aircraft, night vision imaging system (NVIS) compatible. ＆#8226; Measurement of the radiance of NVIS sources over the spectral range 380-930nm ＆#8226; Measurement of the transmission of source filters intended for NVIS use over the range 380-930nm. In essence, both measurements seek to ensure that either no output is seen in the wavelength range at which the NVG is responsive, typically ~600-930nm. This measurement requires an instrument with high sensitivity and high dynamic range, at the core of which is a double monochromator and cooled photomultiplier detector. Coupled to this is an easy to use control software which reports directly NVG results to determine pass or fail. |
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