Abstract
We present an improved analytical model of a spectrometer for optical coherence tomography (OCT), which more accurately describes the OCT in-depth sensitivity fall-off. The model considers the intrinsic spectral resolution of the dispersive element and the influence of additional components (inequidistance-correcting prism). The model is validated by experimental data obtained both from other studies and our own experiments. The influence of the frequency response of the CCD electrical circuit and the analog-to-digital converter to the OCT signal fall-off was also detected and was shown to be significant in some cases.
Highlights
We recorded the value of the optical coherence tomography (OCT) signal for 11 different positions of surface in the probe arm of the interferometer, preserving the total power of backscattered light
This indicates the materiality of the quantitative difference of the proposed description from the previous one and the sufficiency and reliability of the proposed analytical model of the spectrometer
The researcher must be aware of the absence of the electrical circuit influence or consider it—especially when calculating the coefficients characterizing in depth the rate of attenuation of the OCT signal, depending on the type of tissue under study
Summary
Citation: Sherstnev, E.P.; Shilyagin, P.A.; Terpelov, D.A.; Gelikonov, V.M.; Gelikonov, G.V. An ImprovedAnalytical Model of a Spectrometer for Optical Coherence Tomography.Photonics 2021, 8, 534. https://doi.org/10.3390/photonics8120534Received: 30 September 2021Accepted: 24 November 2021Published: 26 November 2021Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.Licensee MDPI, Basel, Switzerland.Attribution (CC BY) license (https://creativecommons.org/licenses/by/
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