title: Automated cosmic spike filter optimized for process Raman spectroscopy.
abstract: Despite the existence of various methods to remove cosmic spikes from Raman data, only a few of them are suitable for process Raman spectroscopy. The disadvantages of these algorithms include increased analysis time, low accuracy of spike detection, or reliance on variable parameters  that must be chosen by trial and error in each case. We demonstrate a novel approach to detecting cosmic spikes in process Raman data and validate it using a wide range of experimental data. This new method features a multistage spike recognition algorithm that is based on tracking sharp changes  of intensity in the time domain. The algorithm effectively distinguishes cosmic spikes from random spectral noise and abrupt variations of Raman peaks, allowing accurate detection of both high and low intensity cosmic spikes. The procedure is free from variable user-defined parameters and  operates reliably in a fully automated manner with a wide range of time-series process Raman data sets containing more than 40 to 50 spectra.
authors.affiliation: Applied Physics Laboratory, University of Washington, Seattle, 98105, USA. sergey@apl.uw.edu
authors.forename: Sergey
authors.initials: S
authors.lastname: Mozharov
authors.forename: Alison
authors.initials: A
authors.lastname: Nordon
authors.forename: David
authors.initials: D
authors.lastname: Littlejohn
authors.forename: Brian
authors.initials: B
authors.lastname: Marquardt
mesh_terms: D000465:Algorithms; D012815:Signal Processing, Computer-Assisted; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013223:Statistics as Topic