Accession Number : ADA311697

Title :   Chemometric Analysis of Multimode Fluorescence Data Obtained with a Pulsed Tunable Laser.

Descriptive Note : Doctoral thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Van Benthem, Mark H.

PDF Url : ADA311697

Report Date : NOV 1995

Pagination or Media Count : 174

Abstract : This research evaluated the capabilities of various chemometric methods for analysis of three-mode fluorescence data. Data were collected using pulsed Nd:YAG laser and pulsed Nd:YAG laser-pumped dye laser excitation and monochromator-PMT-digital oscilloscope detection. This apparatus produced data in the form of nanosecond scale time decay profiles at numerous emission wavelengths generating a wavelength-time matrix (WTM). Third-order data were produced by varying analyte concentrations or changing excitation wavelength to produce a time-resolved excitation-emission matrix (TREEM). Trilinear decomposition (TLD) and global analysis methods were applied to a WTM-concentration 3-array and a TREEM. TLD methods and linear discriminant analysis and classification were performed on highiy complicated data in the form of WTMs of various fuels. The three-mode data were decomposed with an eigenanalysis-based procedure (EBP); three-mode alternating least squares (3M-ALS), also known as PARAFAC; and three-mode nonnegative alternating least squares (3M-NNALS). p4

Descriptors :   *YAG LASERS, *QUANTITATIVE ANALYSIS, *FLUORESCENCE, *TUNABLE LASERS, *PULSED LASERS, *FUELS, *MULTIMODE, FREQUENCY, LINEAR SYSTEMS, EMISSION, SPECTROSCOPY, COMPOSITE MATERIALS, EXCITATION, THESES, ENVIRONMENTAL IMPACT, CONTAMINANTS, PATTERN RECOGNITION, DECAY, CHEMICAL ANALYSIS, DISCRIMINATE ANALYSIS, PHASE MODULATION.

Subject Categories : Physical Chemistry
      Lasers and Masers
      Laminates and Composite Materials
      Atomic and Molecular Physics and Spectroscopy
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE