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    An Algorithm for the Removal of Cosmic Ray Artifacts in Spectral Data Sets

    Barton, Sinead and Hennelly, Bryan M. (2019) An Algorithm for the Removal of Cosmic Ray Artifacts in Spectral Data Sets. Applied Spectroscopy, 73 (8). pp. 893-901. ISSN 0003-7028

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    Cosmic ray artifacts may be present in all photo-electric readout systems. In spectroscopy, they present as random unidirectional sharp spikes that distort spectra and may have an affect on post-processing, possibly affecting the results of multivariate statistical classification. A number of methods have previously been proposed to remove cosmic ray artifacts from spectra but the goal of removing the artifacts while making no other change to the underlying spectrum is challenging. One of the most successful and commonly applied methods for the removal of comic ray artifacts involves the capture of two sequential spectra that are compared in order to identify spikes. The disadvantage of this approach is that at least two recordings are necessary, which may be problematic for dynamically changing spectra, and which can reduce the signal-to-noise (S/N) ratio when compared with a single recording of equivalent duration due to the inclusion of two instances of read noise. In this paper, a cosmic ray artefact removal algorithm is proposed that works in a similar way to the double acquisition method but requires only a single capture, so long as a data set of similar spectra is available. The method employs normalized covariance in order to identify a similar spectrum in the data set, from which a direct comparison reveals the presence of cosmic ray artifacts, which are then replaced with the corresponding values from the matching spectrum. The advantage of the proposed method over the double acquisition method is investigated in the context of the S/N ratio and is applied to various data sets of Raman spectra recorded from biological cells.

    Item Type: Article
    Additional Information: Funding: This research was conducted with the financial support of the Irish Research Council (IRC) under project ID GOIPG/2013/1434 and Science Foundation Ireland (SFI) under Grant Number 15/CDA/ 3667. Cite as: Barton SJ, Hennelly BM. An Algorithm for the Removal of Cosmic Ray Artifacts in Spectral Data Sets. Applied Spectroscopy. 2019;73(8):893-901. doi:10.1177/0003702819839098
    Keywords: Raman spectroscopy; cosmic rays; noise reduction; processing spectra;
    Academic Unit: Faculty of Science and Engineering > Computer Science
    Faculty of Science and Engineering > Electronic Engineering
    Faculty of Science and Engineering > Research Institutes > Hamilton Institute
    Item ID: 14154
    Identification Number:
    Depositing User: Dr. Bryan Hennelly
    Date Deposited: 10 Mar 2021 14:48
    Journal or Publication Title: Applied Spectroscopy
    Publisher: Optical Society of America
    Refereed: Yes
    Funders: Irish Research Council (IRC), Science Foundation Ireland (SFI)
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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