A new modality for the detection of chemical vapors using middle infrared femtosecond pulse propagation effects

William Conner Thomas, Craig A. Zuhlke, Dennis R. Alexander

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We have shown recently that unique optical signatures can be observed with the measurement of ultrashort middle infrared laser pulses that have been transmitted through molecular vapors. Here, we report on an increased signal-to-noise ratio of the pulse measurements by using a cross-correlation technique with a lockin amplifier. Carbon tetrafluoride and dimethyl methylphosphonate (DMMP) cross-correlation signatures are highly discriminated using principal component analysis. A squared exponential Gaussian process regression model is used to quantitatively predict the concentration of DMMP.

Original languageEnglish (US)
Title of host publicationChemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XX
EditorsJason A. Guicheteau, Chris R. Howle
PublisherSPIE
ISBN (Electronic)9781510626850
DOIs
StatePublished - Jan 1 2019
EventChemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XX 2019 - Baltimore, United States
Duration: Apr 15 2019Apr 17 2019

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11010
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceChemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XX 2019
CountryUnited States
CityBaltimore
Period4/15/194/17/19

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Keywords

  • Chemical warfare agents
  • Cross-correlation
  • Four wave mixing
  • Middle infrared
  • Standoff detection
  • Ultrafast optics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Thomas, W. C., Zuhlke, C. A., & Alexander, D. R. (2019). A new modality for the detection of chemical vapors using middle infrared femtosecond pulse propagation effects. In J. A. Guicheteau, & C. R. Howle (Eds.), Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XX [110100X] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11010). SPIE. https://doi.org/10.1117/12.2520793