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  • Computerized stations for testing NVDs / NICOM

NICOM

Article: 00249800

Computerized stations for testing NVDs / NICOM

NICOM test station works as an image projector that project images of standard targets into direction of tested night vision device. The latter device distorts projected image that is later evaluated by human observer or with help of more objective measuring tools (luminance meter, high-res video camera, or digital still camera). MIL standards recommend to use a calibrated tungsten filament lamp of 2856K color temperature as a radiation source. It is technically difficult to develop a reliable, long life, 2856K color temperature tungsten filament light source that enables regulation of light intensity in wide range. Therefore typical test stations for testing night vision devices offered on market are built using a single LED light source. Such test stations are calibrated to simulate 2856K color temperature light source for one specific type of night vision device (typically built using Gen 3 tubes and Class A filter). Measurement accuracy significantly deteriorate when night vision devices of different type are tested. NICOM test station is built using more advanced concept. The station is built using two switchable light sources: halogen bulb of 2856K color temperature source and a monochromatic LED light source. Halogen source is used during measurement of photometric parameters; monochromatic LED source during measurement of imaging parameters. Therefore NICOM station enables accurate measurement of photometric parameters (like brightness gain) of all types of night vision devices. Next, NICOM station can be checked and recalibrated by advanced photometric laboratory because the stations use classical photometric light source. At the same time life time of the test station was significantly extended due to use of halogen source only for measurement of photometric parameters. Test capabilities NICOM test station is optimized for testing night vision goggles (bino and mono) and night vision monoculars of FOV about 40º . However, NICOM test station can be also optionally used for testing night vision sights/binoculars of FOV over 10º. NICOM test station enables measurement (or checking) of a long list of parameters that can be divided into six main groups 1. Basic tests: resolution (center, peripheral, high level), screen quality (dark spots), brightness gain, field of view, ocular diopter power range 2. Maintenance checks: Operational defects (shading, edge glow, flashing,/flickering/intermittent operation, emission points); Cosmetic defects (Dark Spots, Bright Spots, Fixed-Pattern Noise, Chicken Wire, Image Disparity, Output Brightness Variation, Image Distortion), 3. Binocular tests: collimation error, gain disparity, 4. Expanded tests: Minimal Resolvable Contrast, magnification and EBI (option). 5. Electrical tests: power consumption, current, 6. Advanced tests: MTF, SNR. NICOM test station enables recording of test results and video recording of images generated by tested night vision devices. Special software that enables presentation of recorded videos from several tested NVDs at the same time at PC screen is a part of NICOM test station.

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