The velocity and impacting position of a flying projectile is usually measured by optical screen target at the range of
shooting range measurement. In order to improve the situation of low sensitivity and the small effective sensor area in
available optical screen, a laser screen target is put forward in this paper, which takes the line structured light laser as the
transmitter and the silicon PIN photodiode as the receiver. In present paper the performance of the optical screen
transmitter and the distribution of light energy in the whole screen are analyzed, and the graph of distribution simulated
by MATLAB is given. The sensitivity of the effective sensor area is analyzed and calculated. With the verification on air
gun projectile, the design of the optical screen in the effective sensor area within 5m × 5m was able to detect air gun
projectile. The result demonstrated that this optical screen woks with high sensitivity, high stability and reliability, and
the effective sensor area of the measuring can reach to 10m × 10m for the rifle projectile measurement. The mechanical
structure and the signal process circuit can also be used on multiple optical screens target and the large space detection
for early warning.
A conventional velocity measuring system of flying projectile consists of two light screens and a chronometer. The flying trajectory is vertical to the sensing plane of light screens. Otherwise the system might produce more measurement errors. In the terminal of trajectory, it is very difficult to ensure that the trajectory of the flying projectile is vertical to the sensing plane because of the scattering of the projectiles. Especially, there is a quite big angle between the flying trajectory and the sensing plane in measuring the velocity of terminal of the fragments. More errors may occur if using two light screens to measure velocity. The new method for measuring velocity at any direction with six infrared light screens is presented. The six infrared light screens are composed of light screen arrays in some special geometric structure. The chronometer records the times of the projectile going through each screen. The flying velocity and special angle of the projectile, that is flying velocity vector, can be calculated according to six times and the geometric structure parameters.
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