| 摘要 |
PURPOSE:To measure the flying speed of a projectile with high accuracy without receiving restriction of the Radio Law, by measuring the flying speed of the projectile by applying optical Doppler effect. CONSTITUTION:A beam expander 9 magnifies the laser beam emitted from a laser oscillator 8 in required magnifying power and a semipermeable mirror 10 splits said laser beam into reference beam R and sample beam S. Two total reflection mirrors 11a irradiate a projectile 2 with both beams R, S so as to cross said beams on the surface of the projectile 2. The total reflection mirror 11b is allowed to coincide with a reference axis at the center thereof and receives the scattering beams generated when both beams R, S are reflected from the projectile 2 at a required effective caliber to send the same to a beam detector 14. Subsequently, the output signal of the beam detector 14 is amplified by an amplifier 15 and a frequency memory device 16 instantaneously stores the frequency thereof. A frequency tracking device 17 calculates the flying speed of the projectile 2 on the basis of the signal from the frequency memory device 16. A voltage control oscillator 18 attains to shorten a searching time by manually setting the Doppler frequency corresponding to the preliminarily estimated speed of the projectile 2.
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