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Related Experiment Videos

Multiwavelength electronic speckle pattern interferometry for surface shape measurement.

Eduardo A Barbosa1, Antonio C L Lino

  • 1Laboratório de Optica Aplicada, Faculdade de Tecnologia de São Paulo, Centro Estadual de Educação Tecnológica Paula Souza, Universidade Estadual Paulista, Brazil. ebarbosa@fatecsp.br

Applied Optics
|April 21, 2007
PubMed
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This study explores electronic speckle pattern interferometry (ESPI) using multimode diode lasers for surface profiling. The technique effectively maps surface relief using interference fringes, showing potential for food quality control.

Area of Science:

  • Optics and Photonics
  • Metrology
  • Materials Science

Background:

  • Surface profilometry is crucial for quality control and research.
  • Electronic Speckle Pattern Interferometry (ESPI) offers non-contact surface measurement capabilities.
  • Multimode diode lasers provide multiwavelength emission, enabling advanced interferometric techniques.

Purpose of the Study:

  • To theoretically and experimentally investigate profilometry using electronic speckle pattern interferometry (ESPI) with multimode diode lasers.
  • To evaluate phase-stepping techniques for fringe pattern analysis in ESPI.
  • To assess the application of this technique in food production and agricultural research.

Main Methods:

  • Utilized multimode diode lasers for multiwavelength emission in ESPI.

Related Experiment Videos

  • Applied phase-stepping techniques (four and eight stepping) for fringe pattern evaluation.
  • Investigated variations in phase mapping based on the number of laser modes (two, three, and four).
  • Experimentally compared technique performance using a flat bar's surface shaping.

    • Main Results:

    • Demonstrated that multiwavelength laser emission generates interference fringes corresponding to surface relief in single exposures.
    • Presented expressions for phase mapping with two, three, and four laser modes.
    • Experimental comparison showed the effectiveness of the developed techniques.

    Conclusions:

    • The ESPI technique with multimode diode lasers is a viable method for precise surface profilometry.
    • The study highlights the potential of this technique for non-destructive surface analysis in food quality control and agricultural applications.