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A laser screen method for non-contact measurement of projectile impact location

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Abstract

A rectangular laser screen system for measuring the projectile impact location, including criss-crossing rectangle laser screen, photo detectors, electronic circuit, and data acquisition instrument. Rectangle laser screen consists of many same optical modules. Laser beam passes through collimators, expanders and Fresnel lens shape into optical module and focuses on detectors. When an optical screen module is interrupted by a projectile, the photo detectors indicate the location of projectile. Electronic circuit and data acquisition instrument condition and sample the signal. Base on the relationship between electro-optical signal amplitude and projectile coordinate in a module, X-Y coordinate data can be generated instantaneously by the computer based addition of appropriate software. Experimental results show the system is adequate to measure the velocity of a flier larger than 4mm, in the range from 60 to 1000 m/s, with accuracy better than ±4mm. Compared with other optoelectronic targeting systems that only use at indoor, the proposed system can be used indoor or outdoor.

© 2012 Optical Society of America

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