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Continual in-plane displacement measurement with temporal wavelet transform speckle pattern interferometry.

Zhan Gao1, Yan Deng, Yiting Duan

  • 1Key Laboratory of Luminescence and Optical Information of Ministry of Education, Beijing Jiaotong University, Beijing, China.

The Review of Scientific Instruments
|February 4, 2012
PubMed
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A novel heterodyne temporal speckle pattern interferometer dynamically measures in-plane displacement. Wavelet transform effectively extracts displacement information, showing promise for advanced metrology applications.

Area of Science:

  • Optics and Photonics
  • Metrology
  • Signal Processing

Background:

  • Dynamic in-plane displacement measurement is crucial for material analysis and structural health monitoring.
  • Traditional interferometry methods face challenges in real-time analysis of continuous motion.
  • Speckle pattern interferometry offers a non-contact method for surface deformation analysis.

Purpose of the Study:

  • To develop and demonstrate a heterodyne temporal speckle pattern interferometer for dynamic in-plane displacement measurement.
  • To evaluate the effectiveness of the wavelet transform technique for extracting displacement information from frequency-modulated signals.
  • To compare the performance of wavelet transform with Fourier transform for displacement measurement.

Main Methods:

  • Construction of a heterodyne temporal speckle pattern interferometer.

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  • Continuous in-plane displacement of an object.
  • Recording of frequency-modulated output signals using a CCD camera.
  • Application of wavelet transform for displacement information extraction.
  • Comparison of wavelet transform and Fourier transform results.

    • Main Results:

    • Successful construction and operation of the heterodyne temporal speckle pattern interferometer.
    • Demonstration of dynamic in-plane displacement measurement capabilities.
    • Preliminary experimental results show the feasibility of extracting displacement information using wavelet transform.
    • Comparison of wavelet transform and Fourier transform methods for displacement recovery.

    Conclusions:

    • The developed heterodyne temporal speckle pattern interferometer is capable of dynamic in-plane displacement measurement.
    • Wavelet transform is an effective technique for analyzing frequency-modulated signals and extracting displacement information.
    • Further investigation and refinement of the wavelet transform method can enhance measurement accuracy and performance.