Two-wavelength holographic micro-endoscopy

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Alexander Gröger - , University of Stuttgart (Author)
  • Robert Kuschmierz - , Chair of Measurement and Sensor System Technique, TUD Dresden University of Technology (Author)
  • Alexander Birk - , University of Stuttgart (Author)
  • Giancarlo Pedrini - , University of Stuttgart (Author)
  • Stephan Reichelt - , University of Stuttgart (Author)

Abstract

In this paper, we present a method for micro-endoscopic topography measurement utilizing two-wavelength holography. Initially, we evaluate the inter-core dispersion and cross-talk of two commercially available imaging fiber bundles (CFBs) and introduce the concept of virtual surface roughness as a limiting factor of achievable measurement resolution. Subsequently, we describe a micro-endoscope setup incorporating 3D-printed micro-optics, resulting in a total diameter of less than 450 µm. We evaluate the measurement accuracy using a pyramid-shaped test object and demonstrate that a relative measurement error of 7.5% can be achieved with a simple phase unwrapping approach. Moreover, we demonstrate how leveraging a deep learning approach from existing literature, tailored for heavily noisy phase maps, effectively reduces the relative measurement error. The standard deviation of the measurement error is 4.2 times lower with the deep learning approach.

Details

Original languageEnglish
Pages (from-to)23687-23701
Number of pages15
JournalOptics express
Volume32
Issue number13
Publication statusPublished - 17 Jun 2024
Peer-reviewedYes

External IDs

PubMed 39538825

Keywords