Development of quasi common path phase-shifting interferometer for measurement of natural convection fields

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15 Citations (Scopus)


A quasi common path phase-shifting interferometer for convection measurement was developed in this paper. This interferometer has a large measurement area of approximately 100 mm in diameter to visualize the spatial structure of natural convection. It also has a quasi common path to reduce the effects of air disturbance and vibration. In addition, a phase-shifting technique is introduced to improve the interferometer's phase resolution and spatial resolution. Natural convection fields around a vertical flat plate with Rayleigh numbers from 1.9 × 10 6 to 3.0 × 10 6 were measured and the temperature profiles were estimated by the interferometer. The obtained temperature profiles were compared with the analytical solutions. Moreover, the three-dimensional effect of a thermal boundary layer was investigated. To validate the interferometer's capability, the experimental results were compared with the calculated results in terms of changes in the optical path length of the test beam. It was confirmed that the quasi common path phase-shifting interferometer can measure the optical path length change accurately at high phase and spatial resolutions.

Original languageEnglish
Pages (from-to)7460-7470
Number of pages11
JournalInternational Journal of Heat and Mass Transfer
Issue number25-26
Publication statusPublished - 2012 Dec


  • Laminar flow
  • Natural convection
  • Phase-shifting interferometer
  • Visualization

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes


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