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Other optical measurement instruments

INFRAMET

  • Fused imagers / Boresight tester of fused vision clip ons

FCLIP

Article: 00249834

Fused imagers / Boresight tester of fused vision clip ons

Fused vision clip on is a detachable, dual channel (thermal channel and visible channel) afocal electro-optical system of optical magnification equal to one that generates output image to be seen by a telescopic sight. The combined system (fused vision clip on and telescopic sight) can be used to generate clear image of observed scenery at night or low visibility conditions. In this way a soldier/hunter can shoot using a rifle with a telescopic sight at day conditions, and after adding fused vision clip on he can shoot at night/low visibility conditions. Fused vision clip on is built by combining afocal visible imager (typically night vision monocular) with an afocal thermal imager and can generate three types of images: thermal image, visible image, fused image. Fused vision clip on can be considered perfect when there is no noticeable shift between image generated by the telescopic sight cooperating with fused vision clip on and the image generated by the telescopic sight looking directly to the target. This requirement is valid for all three work modes of fused clip on: fused mode, visible only, thermal imaging only and any distance to the target. Badly aligned fused vision clip, when attached to the rifle, produces some image shift (can be different in different channels or image shift depends on distance) and then the shooter can miss the target even after a perfect aiming. Boresight problems with clip ons are quite common as it is extremely difficult to manufacture clip ons that could keep perfect alignment after mechanical shocks and for any distance shooter-target. FCLIP is a computerized test station developed to for testing fused clip ons, thermal clip ons and night vision clip ons. In detail, this station enables measurement of several boresight parameters that precisely characterize earlier mentioned image shift. Test concept is based on an idea to project image of a reference target located at variable distance to input of tested fused clip on and to analyze images generated by two imaging channels of tested fused clip on. In detail the reference images are generated by BTG broad band target generator and are projected by CRI reflective collimator into direction of tested fused clip on. Next, copies of the reference images are captured by IM50 visible camera and send to PC. Finally image analysis is done by specialized software. Tested fused vision clip on is attached to the test station using the standard Picatinny (MIL-STD 1913) rail like in case of real rifles. Other rails are possible, too. Following parameters can be measured using FCLIP station: 1. Deflection angle of night vision channel (angle between optical axis of input optics and optical axis of output optics of night vision channel) 2. Deflection angle of thermal vision channel (angle between optical axis of input optics and optical axis of themal channel). 3. Dual channel boresigth error (angle of optical axis of night channel and optical axis of thermal channel) 4. Resolution of visible channel (spatial angular frequency of minimal resolvable target) 5. Resolution of thermal channel (spatial angular frequency of minimal resolvable target) 6. Channel rotation difference (angle between axis of visible channel relative to thermal channel) 7. Rotation of visible channel ( rotation angle between image from visible channel relative to image generated by telescopic sight) 8. Rotation of thermal channel ( rotation angle between image from thermal channel relative to image generated by a telescopic sight) 9. Boresight error of focusing mechanism of night vision channel (angle between optical axis of night vision channel for infinity distance and the same axis of the channel focused at finite distance of interest) 10. Boresight error of focusing mechanism of thermal channel (angle between optical axis of thermal channel for infinity distance and the same axis of the channel focused at finite distance of interest). All parameters of clip ons listed above give valuable information on quality of clip ons or how to make boresight errors negligible during production or repairing process. Parameters no 1-3 are considered as crucial.

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