Probing depth enhancements of spectral domain optical coherence tomography using axicons for the inspection of additively manufactured polymer parts

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


In the past decade, advances in optical coherence tomography (OCT) have diversified its application beyond its origins in imaging applications for the life sciences. The non-destructive nature of OCT along with its subsurface imaging capability makes it a promising tool for many industrial applications, from dimensional measurement to the inspection and characterization of materials. One such application area is in the production of additively manufactured polymer parts where OCT can provide both qualitative and quantitative feedback relating to component specification and quality. Nonetheless, one major limitation of OCT is its limited depth of focus when conventional objective lenses are used. To overcome this limitation, we used an axicon lens to achieve longer depth of focus without any degradation in the resolution. This will also simplify the measurement process and speeds up the acquisition which is very beneficial in high throughput manufacturing scenarios. We demonstrate the superior performance of axicon lens by imaging dispersed set of particles in an optical phantom, clearly showing the axicon maintaining lateral resolution over a significant depth, compared with the use of a conventional OCT. We further demonstrate the suitability of this approach for use in manufacturing applications by presenting the results of a measurement of a 3D printed microfluidic device, validated against commercial X-ray computed tomography (XCT).
Original languageEnglish
Title of host publicationProceedings of the Joint Special Interest Group meeting between euspen and ASPE
Subtitle of host publicationAdvancing Precision in Additive Manufacturing
Number of pages4
Publication statusPublished - 19 Sep 2023
EventEuropean Society Precision Engineering and Special Interest Group: Advancing Precision in Additive Manufacturing - KU Leuven, Leuven, Belgium
Duration: 19 Sep 202321 Sep 2023


ConferenceEuropean Society Precision Engineering and Special Interest Group
Abbreviated titleEUSPEN 2023
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