3. The distance a person's eyes must be from the last element of an eyepiece in order to achieve the optimal image area.
5. ea outside the visible spectrum that cannot be seen by the human eye (between 700 nanometers and 1 millimeter). The visible spectrum is between 400 and 700 nanometers.
7. A faint hexagonal (honeycomb) pattern throughout the image area that most often occurs under high-light conditions. This pattern is inherent in the structure of the microchannel plate and can be seen in virtually all Gen 2 and Gen 3 systems if the light level is high enough.
8. Image Intensification tube specification designation, calculated on line pair per mm x signal to noise.
9. A single channel optical device
10. High-power devices providing long-range illumination capability. Ranges of several thousand meters are common. Most are not eye-safe and are restricted in use. Each IR laser should be marked with a warning label like the one shown here. Consult FDA CFR Title 21 for specific details and restrictions.
11. This is the number of times a night vision device amplifies light input
1. Many night vision devices incorporate a built-in infrared (IR) diode that emits invisible light or the illuminator can be mounted on to it as a separate component. IR light cannot be seen by the unaided eye; therefore, a night vision device is necessary to see this light. IR Illuminators provide supplemental infrared illumination of an appropriate wavelength, typically in a range of wavelengths (e.g. 730nm, 830nm, 920nm), and eliminate the variability of available ambient light, but also allow the observer to illuminate only specific areas of interest while eliminating shadows and enhancing image contrast.
2. The shortest wavelengths of the infrared region, nominally 750 to 2,500 nanometers
4. The diameter of the imaged area when viewed through an optic
6. Denotes the photons perceptible by the human eye in one second.
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