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Rayleigh interferometer

Rayleigh interferometer
Rayleigh interferometer at the National Bureau of Standards

In optics, a Rayleigh interferometer is a type of interferometer which employs two beams of light from a single source. The two beams are recombined after traversing two optical paths, and the interference pattern after recombination allows the determination of the difference in path lengths.

Principle of Operation

Rayleigh Interferometer
Collimated coherent light passing through two tubes with different refraction index gases, then an imaging lens creates the interferogram.

Light from a source (left) is collimated by a lens and split into two beams using slits. The beams are sent through two different paths and pass through compensating plates. They are brought to a focus by a second lens (bottom) where an interference pattern is observed to determine the optical path difference in terms of wavelengths of the light.

Advantages and disadvantages

The advantage of the Rayleigh interferometer is its simple construction. Its drawbacks are (i) it requires a point or line source of light for good fringe visibility, and (ii) the fringes must be viewed with high magnification.

References

References

  1. (1990). "Multielement detection systems for spectrochemical analysis". Wiley.
  2. (2007). "Basics of interferometry". Elsevier Academic Press.
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