OPENTECHNICAL PUBLICATION
OT-2026-000000303

Method of calibrating optical coherence tomography apparatus to measure depth

Published: 2026-09-15T19:02:43.376972Z
Permanent URL: https://opentechnical.org/p/OT-2026-000000303
Categories: Sensors, Controls & Machine Vision > Position and Presence Sensing

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ABSTRACT

A method of calibrating an apparatus configured to perform optical coherence
tomography to measure depth of an article of a prescribed type comprises (a)
using an existing measurement system configured to measure depth, measuring a
sample of the article to obtain reference depth measurements; b) using the
optical coherence tomography apparatus, capturing sectional images of the
sample at the same positions at which the reference depth measurements were
obtained; c) determining, in each sectional image, a number of pixels in a
depth direction of the sample; and d) determining, using the reference depth
measurements and the numbers of pixels from the sectional images, a
correlation curve to associate pixels in images captured by optical coherence
tomography with physical depth. Measuring the sample comprises performing
plural measurements at different positions on the sample. Each measurement is
in the form of a profile of the sample at a corresponding position thereon.

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OpenTechnical publication OT-2026-000000303
Published 2026-09-15T19:02:43.376972Z
https://opentechnical.org/p/OT-2026-000000303