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Laser interferometer

Laser interferometer. Su-Jin Kim, GNU & Xiaoyu Ding. Xiaoyu Ding. Laser Interferometer. What’s laser interferometer? The principle of standard interferometer Types of interferometers Applications. Xiaoyu Ding. What’s a Laser Interferometer. Laser Interferometer:

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Laser interferometer

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  1. Laser interferometer Su-Jin Kim, GNU & Xiaoyu Ding

  2. Xiaoyu Ding Laser Interferometer • What’s laser interferometer? • The principle of standard interferometer • Types of interferometers • Applications

  3. Xiaoyu Ding What’s a Laser Interferometer • Laser Interferometer: • the instrument used for high precision measurements (distance, angles…. etc.) • it uses interferometry as the basis for measurement. • it uses the very small, stable and accurately defined wavelength of laser as a unit of measure.

  4. Xiaoyu Ding Physics Review • Diffraction Diffraction is a sure sign that whatever is passing through the hole is a wave. Diffraction of Water Waves

  5. Xiaoyu Ding Physics Review • Diffraction of Light Light, just like a water wave, does spread out behind a hole is the hole is sufficiently small. Light is a electromagnetic wave. Diffraction of light Wave

  6. Xiaoyu Ding Physics Review • A Double-Slit Interference Experiment Color pattern Visiblelight Interference of Light

  7. Xiaoyu Ding Principle of Michelson Interferometer • Albert Michelson (1852~1931) • the first American scientist to receive a Nobel prize, invented the optical interferometer. • The Michelson interferometer has been widely used for over a century to make precise measurements of wavelengths and distances. Albert Michelson

  8. Xiaoyu Ding Principle of Michelson Interferometer • Michelson Interferometer • Separation • Recombination • Interference A Michelson Interferometer for use on an optical table

  9. Xiaoyu Ding Principle of Michelson Interferometer • Analyzing Michelson Interferometer • The central spot in the fringe pattern alternates between bright and dark when Mirror M2 moves. If we can know the spacing distance of M2 betweentwo sequent central bright spots and the number of central bright spots appeared, then we can calculate how long M2 moved. λ/4 -> bright to dark Photograph of the interference fringes produced by a Michelson interferometer.

  10. HeNe • 632.8 nm wave length is used.

  11. Xiaoyu Ding Applications • Measurement of Distance • 1) frequency stabilized He-Ne laser tube • 2) combination of beam-splitter and retroreflector • 3) a moving retroreflector • 4) detection electronics Aerotech’s LZR3000 Series Laser Interferometer System

  12. Xiaoyu Ding Applications • Other Applications • Measure angles, flatness, straightness, velocity and vibrations, etc. Rearrangements of the light paths

  13. Xiaoyu Ding Resolution • XL-80 Laser Measurement System

  14. Xiaoyu Ding References • http://www.aerotech.com/products/engref/intexe.html • http://www.renishaw.com/en/interferometry-explained--7854 • http://en.wikipedia.org/wiki/Michelson_interferometer • http://en.wikipedia.org/wiki/Interferometry • PHYSICS FOR SCIENTISTS AND ENGINEERS, Randall D. Knight, 2003.

  15. Laser interferometer Su-Jin Kim Gyeongsang National University

  16. Linear Distance Measurement The positioning accuracy is measured by comparing the position value displayed by machine with the actual position.

  17. Rectangularity Measurement Measurement of the rectangularity between the x-axis and z-axis.

  18. Straightness Measurements Straightness and parallelism measurements with moving board up to 20 mm.

  19. Reference • http://www.youtube.com/watch?v=VyePASErr5Q Theory

  20. Renishaw • http://www.youtube.com/watch?v=41Auhp1RTP0

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