| 摘要 |
A viewing system for use in low visibility atmospheres, such as fog, rain, snow, dust, smoke, etc., particularly under nighttime conditions. A cyclically-operated pulsed light source illuminates the scene for brief instances. A shutter is operated in synchronism with the light source for transmitting to a human observer (or TV camera) light rays reflected from objects located selected distance intervals away from the light source; light rays from other zones or areas are excluded. By thus excluding light reflections from zones outside the selected distance interval, it should be possible to minimize glare associated with the excluded light, thereby improving the view of objects located within the selected distance interval. The viewing system may include mechanisms for varying the time relationships between the pulsed light source and shutter, such that different selected distance intervals are viewed in continuous progression; the different views are flashed very rapidly so that the human observer or TV camera effectively sees objects in various different distance intervals, e.g., the entire range distance of the light source.
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