A special lens focuses the infrared rays emitted by objects within the field of view. A phased array on the infrared detector element scans the focused light. The detector elements produce very detailed temperature patterns called temperature spectra. It only takes about 1/30 of a second for the detector array to obtain temperature information and produce a temperature spectrum. This information is obtained from thousands of detection points in the field of view of the detector array.
The temperature spectrum generated by the detector element is converted into electrical pulses. These pulses are transmitted to the signal processing unit - a circuit board integrated with precision chips that convert the information from the detector elements into data that can be read by the display. The signal processing unit sends information to the display to display various colors on the display, with the intensity of the color determined by the intensity of the infrared emission. By combining the pulses from the detector elements, an image is produced.
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Using night vision goggles under strong light will cause the greatest damage to night vision goggles. Although night vision goggles automatically cut off circuit protection devices when overloaded, exposure to bright light can shorten the service life of night vision goggles. Exposure to rain, fog, and even high humidity can also damage night vision equipment. For use at night, night vision equipment is designed to withstand short periods of bright light or moisture.
There are very precise vacuum tubes in night vision equipment. Be sure to avoid collisions and handle them carefully. Clean night vision goggle lenses the same way you clean camera lenses. The lenses have an optical coating that can easily be scratched by dust or penetrate the glass if it comes into contact with rough materials. There is usually no need to remove the lens to clean the interior. If not used for a long time, it is best to remove the battery and store the night vision device in a cool, dry place.