The more it rains, the denser the "noise" on the screen looks. The reflectivity of the water is very high. Some of them will be absorbed, and some will bounce off the surface of the drops and create visual "noise" on the monitor of the night vision monocular. Each particle of water will interfere with the passage of photons of light. Now let's make the situation worse - it's raining. Near the sea, the contours of objects will be softer and blurred on the screen of the same night vision binoculars. A more contrasting and clearer picture will be on night vision binoculars in the mountains. For example, let's take the air of the sea coast and alpine air. The clearer the air and less saturated with water vapor, the more precise the image on the screen. They create the effect of partial absorption of light by the atmosphere and cause the photons to scatter. Light travels in the atmosphere, not in a vacuum.Ĭonsequently, impurities of gases, dust, the smallest particles of water will interfere with the passage of light. For a perfect image, nothing should interfere with the passage of light photons. The light travels the distance from the subject to the lens of the night vision goggles. On a night vision monitor, we see the light reflected from objects. Night vision equipment and a thermal imager display the picture on the screen differently. How does a night vision device work when it rains? It is a heat map of the area to which the device is directed. The thermal sensor measures and the processor processes the data and forms a picture. The lenses of the thermal imager capture the minor heat radiation. All thermal imaging devices are capable of recording this temperature. In simpler terms, you can measure the temperature of any object, even a cold one. It is based on the property of any object with a temperature above absolute zero to emit thermal energy. TV technology uses an entirely different principle. This light forms an image on the screen of night vision equipment. The latter bombard the phosphor screen, which causes the emission of photons of light. That is, an increase in the amount of energy occurs. Electrons enter the microchannel plate and cause an additional emission of electrons. The collected light enters the photocathode, where it is converted into electrons. The lenses of the device are capable of capturing the most inefficient light radiation invisible to the eye. NV technology involves capturing and enhancing weak night light reflected from objects. We also investigate the factors that should be considered when choosing in favor of night vision optics or thermal imaging devices. Let's decide which of them will work better in rainy weather. In this article, we will look at how night vision devices and thermal imaging equipment work.
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