Accession Number : AD0749670

Title :   A Laser Doppler Velocimeter for Measuring the Initial Velocity of a Projectile.

Descriptive Note : Research rept.,

Corporate Author : NAVAL ACADEMY ANNAPOLIS MD

Personal Author(s) : Haagensen,Brian Christian

Report Date : 19 MAY 1972

Pagination or Media Count : 58

Abstract : The experiment attempted to study the feasibility of measuring the initial velocity of naval gun projectiles by the application of the optical Doppler shift - measured in a laser beam. A helium-neon was used to produce the beam of light that was split into two components. One component was reflected from the moving object causing a shift in the frequency of the beam and then recombined with the second, unshifted component to form a beat frequency. This modulated beam was heterodyned in a photomultiplier tube, producing an output voltage. The frequency of the photomultiplier signal matched the Doppler shift induced in the laser beam, and was measured by a spectrum analyzer. (Author)

Descriptors :   (*FLIGHT SPEED INDICATORS, PROJECTILES), FIRE CONTROL SYSTEMS, DOPPLER EFFECT, GAS LASERS, VELOCITY, MEASUREMENT

Subject Categories : Test Facilities, Equipment and Methods
      Armor
      Fire Control and Bombing Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE