Optical Coherence Tomography (OCT) for Topography of Objects

Photo of the Thorlabs OCT I used for the measurements.

Code for Topography from OCT

I developed an image processing code to convert the calculate the topography of objects using the OCT results.
The value in a cluster of neighbouring voxels was considered as a criterion to recognize the surfaces.
I used this technique to measure the 3D topography and contact points of fabrics on flat surfaces. Here is a photo of the fabrics.

Orthogonal views of different fabrics captured by OCT. The surface field of view is 9 mm by 9 mm and the depth is 2 mm. The machine direction (MD) and cross machine direction (CD) is identical for all fabrics.

a) Reflected-light-microscopic images of the TAD fabrics, b) orthogonal views captured by OCT, and c) maps of contact points. Photos show the paper side and the vertical axis corresponds to the machine direction (MD). The field of view for F1 and F2 is 4.5 mm by 3.5 mm and for F3 and F4 is 9.0 mm by 7.0 mm.

For more details please see my thesis!

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