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Endoscopic double-pulse electronic-speckle-pattern interferometer for technical and medical intracavity inspection.

B Kemper1, D Dirksen, W Avenhaus

  • 1University of Muenster, D-48129 Muenster, Germany. Kemper@gabor.uni-muenster.de

Applied Optics
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A new endoscopic electronic-speckle-pattern interferometer (ESPI) system enables sensitive, real-time inspection of technical and biological samples. This compact device offers visual feedback for minimally invasive procedures, enhancing diagnostic capabilities.

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Area of Science:

  • Optics and Photonics
  • Biomedical Engineering
  • Materials Science

Background:

  • Traditional endoscopic examinations lack tactile feedback, limiting diagnostic precision.
  • Interferometry offers high-sensitivity measurements but is challenging to miniaturize for endoscopic applications.
  • Existing endoscopic imaging systems require further enhancement for detailed internal structural analysis.

Purpose of the Study:

  • To develop a compact endoscopic electronic-speckle-pattern interferometer (ESPI) system.
  • To enable highly sensitive, real-time interferometric inspection within cavities.
  • To explore applications in technical object examination and minimally invasive medical diagnostics.

Main Methods:

  • Integration of optical fibers for laser beam delivery and an endoscopic imaging system.
  • Utilizing a Charge-Coupled Device (CCD) camera with a fast frame-grabber for dynamic image subtraction.
  • Achieving high fringe contrast at a frequency rate of up to 25 Hz.

Main Results:

  • Successful demonstration of the compact ESPI system for both technical and biological object analysis.
  • Acquisition of high-contrast interferometric data in vitro and in vivo.
  • Validation of the system's capability for dynamic, high-frequency measurements.

Conclusions:

  • The developed endoscopic ESPI camera system provides a novel tool for sensitive intracavity inspection.
  • This technology offers potential for "endoscopic taction," replacing tactile sensation with visual information in minimally invasive therapy.
  • The system expands possibilities for handheld, high-resolution diagnostics in both industrial and medical fields.