skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Perspective: Photoacoustic spectroscopy: Linearization and signal recovery in photoacoustic infrared spectroscopy

Abstract

No abstract prepared.

Authors:
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
963130
Report Number(s):
IS-J 7233
Journal ID: 0034-6748; TRN: US200917%%170
DOE Contract Number:
DE-AC02-07CH11358
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 78; Journal Issue: 5
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; PHOTOACOUSTIC SPECTROSCOPY; INFRARED RADIATION; DATA ANALYSIS

Citation Formats

McClelland, John F. Perspective: Photoacoustic spectroscopy: Linearization and signal recovery in photoacoustic infrared spectroscopy. United States: N. p., 2007. Web. doi:10.1063/1.2736265.
McClelland, John F. Perspective: Photoacoustic spectroscopy: Linearization and signal recovery in photoacoustic infrared spectroscopy. United States. doi:10.1063/1.2736265.
McClelland, John F. Tue . "Perspective: Photoacoustic spectroscopy: Linearization and signal recovery in photoacoustic infrared spectroscopy". United States. doi:10.1063/1.2736265.
@article{osti_963130,
title = {Perspective: Photoacoustic spectroscopy: Linearization and signal recovery in photoacoustic infrared spectroscopy},
author = {McClelland, John F.},
abstractNote = {No abstract prepared.},
doi = {10.1063/1.2736265},
journal = {Review of Scientific Instruments},
number = 5,
volume = 78,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}
  • A finite difference model was constructed to describe the origin of the complex transients in pulsed photoacoustic spectroscopy signals. With inclusion of boundary conditions and material interfaces, the model is shown to give qualitative agreement with experimental transients. The model provides insight into the results of varying the photoacoustic-cell materials and/or geometric configuration for cell optimization. The transients are found to contain significant information regarding resonant modes in the photoacoustic cell assembly. The transient signal behavior is explained in terms of these resonant cavity modes, and it is determined which cell cavities are relevant to a given time segment ofmore » the signal. Analytical detection limits are correlated with each point on the transient signal.« less
  • Surface analysis of the corrosion products formed on iron metal exposed to off gas from a HCN production process has been performed. The atmosphere contains HCN(g), NH/sub 3/(g), and H/sub 2/O(g) plus other trace gases. Iron gratings exposed to the atmosphere form a dark blue coating which pits the surface of the iron. Samples of the corroded iron surface were analyzed by FT-IR/photoacoustic spectroscopy (PAS) and x-ray photoelectron spectroscopy (XPS or ESCA). The mid-IR spectrum from PAS yielded peaks due to NH/sub 4/ /sup +/, CN/sup -/, and H/sub 2/O. ESCA analysis confirmed that the surface iron was divalent, coordinatedmore » to cyanide, and no iron(II) oxide was present. Relative quantitation from ESCA showed a 1:4 ratio of NH/sub 4//CN type nitrogen, thus a specific single stoichiometry was not postulated for the corrosion product. Peak positions of the cyanide stretching frequencies suggest a mixed ferro(ferrocyanide) complex, with some ammonium as a counterion. This study illustrates the detailed structural information obtainable from FT-IR/PAS with ESCA and the applicability of FT-IR/PAS to corrosion problems.« less
  • In the forest products industry, improved methods are needed for rapid analysis of wood and paper products. Currently, the best methods for determining chemical and physical properties of wood-based materials require considerable sample preparation and analysis time. Consequently, quantitative information is often not obtained on a time scale suitable for process monitoring, control, and quality assurance. The primary barriers to practical utilization of conventional infrared methods are the opaqueness and poor reflection properties of the wood-based materials. This paper demonstrates how photoacoustic and transient infrared spectroscopies have been combined with chemometric techniques to overcome the limitations of conventional infrared spectroscopiesmore » and to permit rapid chemical and physical characterization of wood chips. Both photoacoustic and transient infrared spectroscopic methods are examined as rapid at- and on-line techniques for feedstock identification and chemical composition analysis prior to processing. {copyright} {ital 1998 American Institute of Physics.}« less
  • Relative numbers of Bronsted acid to Lewis acid sites on silica-alumina have been determined photoacoustically by an infrared analysis of chemisorbed pyridine compared to similar adsorption of ..gamma..-alumina that has only Lewis sites. Results are similar to those obtained by earlier IR transmission studies that suggested the use of framework vibrations of silica as an internal reference standard. The 20% coverage of the silica-alumina surface by pyridine adsorbed at Bronsted sites found photoacoustically is in good agreement with a previous value of 17% estimated from transmission spectroscopic data. Reproducibility of the photoacoustic measurements is excellent.