光源 真空紫外光谱仪 订制光谱仪 软X射线光谱仪 拉曼光谱仪 红外\紫外激光观察仪 夜视仪器 HPLC荧光光度计 CCD相机 动态光散射 高速摄影照相机 光纤光谱仪 海洋系列光谱仪 光谱系统 原子力显微镜 探测器 滤光片 红外光谱仪 单色仪 光栅 照度计 光信号电子学仪器 工业内窥镜 薄膜测量 PC示波器 数字记录仪 远红外太赫兹光谱仪 太阳光模拟器 袖珍数码显微镜相机 压电陶瓷 紫外线固化机 紫外反射镜 滤光片测量仪 电动位移台/电控位移台 纳米位移台 光电探测器 均匀光源
| 光电测量产品 >> 光谱系统 >> NVIS 夜视系统检测系统 | |
 |
|
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. |
|
