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首页> 外文期刊>Safe Journal >Night Vision Goggle Objective Lens Focusing at Different Distances Using Artificial Objects, Natural Objects and the Hoffman 20/20~(TM) Tester
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Night Vision Goggle Objective Lens Focusing at Different Distances Using Artificial Objects, Natural Objects and the Hoffman 20/20~(TM) Tester

机译：使用人工物体，自然物体和霍夫曼20/20〜（TM）测试仪将夜视镜物镜聚​​焦在不同距离上

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摘要

Before performing an airborne mission that uses night vision goggles (NVGs), aircrew must properly set the NVG's various adjustments: inter-pupillary distance, tilt, eye relief, height, eyepiece and objective lens focus. Currently, aircrew use a Hoffman 20/20~(TM) test unit to pre-focus their NVG objective lenses at optical infinity before boarding their aircraft. They may also refocus their objective lenses while in the cockpit and during the course of the mission. The purpose of this paper is to present a methodology for studying how well an individual can focus the objective lens of the NVGs and compare the focus for objects at different distances. One important finding is that the infinity focus distance for these NVGs is at least 160 feet away. This means one should not use the standard 20 foot eye lane to accomplish objective lens focus prior to flight (fortunately, this is not a common practice but there has been anecdotal evidence that, on occasion, the 20 foot eye lane has been used for pre-flight focusing of the NVGs). Another finding is that the Hoffman 20/20~(TM) devices do not produce a statistically different focus position than true infinity.
机译：在执行使用夜视镜（NVG）的空降任务之前，机组人员必须正确设置NVG的各种调整：瞳孔间距离，倾斜度，护眼效果，高度，目镜和物镜聚焦。当前，机组人员在登机之前使用霍夫曼20/20〜（TM）测试装置将其NVG物镜预聚焦在光学无限远处。他们还可以在驾驶舱内和执行任务期间重新聚焦物镜。本文的目的是提出一种方法，用于研究个人对NVG物镜的聚焦程度，并比较不同距离物体的聚焦情况。一个重要发现是这些NVG的无限远焦距至少为160英尺。这意味着在飞行之前，不应使用标准的20英尺眼道来完成物镜的聚焦（很遗憾，这不是一种常见的做法，但有传闻证据表明，有时候20英尺眼道已被用于-NVG的飞行聚焦）。另一个发现是霍夫曼20 / 20TM设备产生的聚焦位置与真正的无限远没有统计上不同。

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