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. 2022 Jun 22;12:10590. doi: 10.1038/s41598-022-14869-5

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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OS-PAM System characterization; (a) EPP graph over the whole imaging spectral range measured on the sample; (b) Characterisation of the lateral field of view (FOV) of the instrument. PAM signal collected whilst imaging a carbon fibre tape is plotted for each lateral position in the image. The plot corresponds to the amplitudes of the signal at the positions showed by the purple dashed line in the inset image. The size of the image $10 \times 10$ mm; (c) Lateral resolution per wavelength measured by imaging a sharp edge (letter) on a USAF target, extracting the ESF and calculating the LSF. The size of the image is $0.5 \times 0.5$ mm; (d) Axial resolution measured imaging carbon fibre tubes. The Axial resolution is defined by the FWHM of the Hilbert transform (Signal envelope).