Laser Doppler principle - Metrology & Quality Control

Q.  According to laser Doppler principle, light experiences a change in its frequency when it comes in contact with a moving object depending upon
- Published on 07 Aug 15

a. the velocity of the object
b. the direction of the object
c. both a. and b.
d. none of the above

ANSWER: both a. and b.

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    Discussion

  • Sravanthi   -Posted on 27 Oct 15
    - LASER (Light amplification by Stimulated Emission of Radiation) beams are high energy density electromagnetic beams. They are highly coherent, unidirectional and monochromatic.

    - Laser Doppler Velocimeters use laser Doppler principle. Light experiences a change in its frequency when it comes in contact with a moving object depending upon velocity and direction of the object. Laser Doppler Velocimeters use differential Doppler technique to measure velocity.

    - It is a technique which uses Doppler shift in a laser beam to measure velocity. Velocity is measured in transparent or semi-transparent fluids or vibratory motion of opaque.

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