Intensity-corrected 4D light-in-flight imaging

Light-in-flight (LIF) imaging is the measurement and reconstruction of light's path as it moves and interacts with objects. It is well known that relativistic effects can result in apparent velocities that differ significantly from the speed of light. However, less well known is that Rayleigh s...

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Bibliographic Details
Published inarXiv.org
Main Authors Morland, Imogen, Zhu, Feng, German Mora Martin, Gyongy, Istvan, Leach, Jonathan
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 23.03.2021
Subjects
Imaging
Laser arrays
Light
Light speed
Luminous intensity
Photon avalanches
Photons
Physics - Optics
Pulse propagation
Rayleigh scattering
Relativistic effects
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Summary:Light-in-flight (LIF) imaging is the measurement and reconstruction of light's path as it moves and interacts with objects. It is well known that relativistic effects can result in apparent velocities that differ significantly from the speed of light. However, less well known is that Rayleigh scattering and the effects of imaging optics can lead to observed intensities changing by several orders of magnitude along light's path. We develop a model that enables us to correct for all of these effects, thus we can accurately invert the observed data and reconstruct the true intensity-corrected optical path of a laser pulse as it travels in air. We demonstrate the validity of our model by observing the photon arrival time and intensity distribution obtained from single-photon avalanche detector (SPAD) array data for a laser pulse propagating towards and away from the camera. We can then reconstruct the true intensity-corrected path of the light in four dimensions (three spatial dimensions and time).
ISSN:2331-8422
DOI:10.48550/arxiv.2103.12464