Night vision devices
Night vision devices are one of crucial surveillance technologies for defense/security sector. NVDs have also found mass applications outside defense sector. Testing NVDs is needed for both manufacturers, maintenance workshops and final users for a set of different and important reasons. Hi-tech test equipment can help significantly in manufacturing, maintenance, training, purchase optimization, and optimal use of night vision devices.
Inframet has developed NV series of high-tech stations to enable professional testing night vision devices. The set of nine test stations (NVT, NV14, NVS, N20, N2D, NCLIP, NIG, NICOM, and NIMAX) enable testing virtually all night vision devices present on the market. The test stations can be divided into two groups: A)Non-computerized stations, B)Computerized test stations. Test capabilities of both types of test stations are almost the same. However, higher measurement speed, better measurement accuracy, and possibility of digital archiwization of measurement results are significant advantages of the computerized test stations.
A. Non-computerized test stations
of tested NVD
|goggles, monoculars||sights, binoculars of optics up to 150 mm||goggles monoculars||goggles monoculars||all types||periscope binocular goggles|
of tested NVD
|-------||goggles, monoculars||sights, binoculars of optics up to 70mm||-------------||----------|
|Design concept||compact, stand alone station||modular station with exchangeable collimators||compact, stand alone station||compact, portable station||compact, stand alone||compact, stand alone station|
|Test range||standard MIL range||standard MIL range||standard MIL range||basic, mission readiness tests||brightness gain, current consumption||basic tests|
|NVS test station|
|NSIGHT test station||NIG test station||N2D test station|
|NCEL test station||NV20 test station||
NWIDE test station
B. Computerized test stations
|Optimal type of tested NVD||goggles, monoculars||goggles, monoculars, and sights, binoculars of optics up to 120 mm||night vision clip ons|
|Optional type of tested NVD||sights, binoculars of optics up to 70 mm||sights, binoculars of optics up to 150 mm||-------|
|Design concept||computerized, stand alone test station||computerized, stand alone test station of desk style||computerized modular station|
|Test range||expanded test range, digital data/image recording||expanded test range, digital data/image recording||alignment error check|
NICOM test station NIMAX test station
|NCLIP test station|
ADDITIONAL TEST STATIONS
Binocular night vision goggles (NVGs) enable aviators to carry out missions at night conditions. However, the goggle fixed to helmet can also break neck of aviator during accidents due to apparent increase of weight of the goggles.
In order to prevent such a situation aviator NVGs are equipped with a mechanism of automatic breakaway that disconnects the goggles with the helmet when g-force exceed a certain limit (typically force in range from 11 to 15 g).
MIL standards that regulate testing night vision goggles present a method to measure test breakaway mechanism of aviator NVGs. In detail two checks are to be done: a)if breakaway mechanism does not activate below level of 9 g; b)if breakaway mechanism disconnects with the helmet when force of 15 g is applied. Attention: different manufacturers of NVGs present sometimes slightly different requirements.
Measurement of both two levels of force looks like an easy task to be done using a force meter. Therefore tests of automatic breakaway mechanism of aviator NVGs are often done using ad-hoc set ups. The problem is that such improvised test systems generate results of low accuracy and low repeatability.
FORK is a professional station for testing automatic breakaway mechanisms of aviator NVGs. The station enables stabilization of tested NVGs to a horizontal platform, precision increasing of force in vertical direction applied to mechanical center of the goggles, and measurement of force when break way mechanism is activated. The test method is fully equivalent to method proposed in MIL standards that regulate testing aviator NVGs.
The station produces precision, repeatable test results. Station operation is simple and fast Several dozens of aviator NVGs can be tested within one hour.
FORK station is optimized for testing ANV/AVS-9 aviator goggles but basically any equivalent aviator goggles can be tested.