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3-D profilometer using a CCD linear image sensor: application to skin surface topography measurement.

D Nita1, J Mignot1, M Chuard1

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Summary

A new non-contact 3-D profilometry system accurately measures skin topography over a wide vertical range (7 mm). This advanced skin analysis tool quantifies surface variations quickly and precisely for various applications.

Keywords:
3CCD detectorD profilometrycontact profilometernonskin surface topographytriangulation method

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Area of Science:

  • Biomedical Engineering
  • Dermatology
  • Surface Metrology

Background:

  • Three-dimensional (3-D) profilometry is essential for measuring skin surface topography.
  • Existing systems often have limited vertical ranges (e.g., 0-1000 μm), restricting analysis of diverse skin features from microrelief to pathologies.
  • The required vertical scale depends on precision needs and acquisition time.

Purpose of the Study:

  • To develop and present a novel 3-D profilometry system for skin surface analysis.
  • To overcome the limitations of existing profilometers regarding vertical range and measurement speed.
  • To enable precise, non-contact quantification of skin topography across a broad spectrum of roughness variations.

Main Methods:

  • A non-contact optical principle is employed for skin replica analysis.
  • The system features a wide vertical range of approximately 7 mm.
  • High scanning speed allows for rapid data acquisition without magnification changes.

Main Results:

  • The profilometer achieves a vertical sensitivity of 4 μm within its 7 mm vertical range.
  • It offers a significantly wider vertical range compared to mechanical or focusing profilometers.
  • Despite lower sensitivity than some specialized systems, its broad range is advantageous for diverse skin surface measurements.

Conclusions:

  • The developed system enables measurement of large skin surfaces with substantial roughness variations due to its wide vertical range.
  • Precise, non-contact skin topography quantification is achievable in a short timeframe.
  • The system requires the initial replica position to be within the 7 mm vertical range for optimal performance.