Infrared photodetector apparatus for measuring projectile velocity
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United States of America Patent
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Jul 2, 2002
Grant Date -
N/A
app pub date -
Jan 14, 2000
filing date -
Jan 14, 2000
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Abstract
A ballistic projectile velocity measurement apparatus including two screens spaced apart at a known fixed distance for providing time measurement start and stop signals indicative of the passage of a ballistic projectile through a light curtain formed by contiguous focused light beams from plural infrared light sources which causes a perturbation or fluctuation in the light intensity level received by one or more photo-optic sensors to calculate the speed or velocity of the ballistic projectile. A calculation and display unit for receiving the time measurement signals, calculating the speed or velocity of the ballistic projectile and storing and displaying the sensed and calculated information is connected to the screens and controlled by keyboard command.
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