Static Fourier transform mid-infrared spectrometer with continuous background correction

2019 ◽  
Author(s):  
Michael H. Köhler ◽  
Michael Schardt ◽  
Hamza B. Ghazala ◽  
Ennio Colicchia ◽  
Patrick Kienle ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Background Correction ◽  
Mid Infrared ◽  
Continuous Background ◽  
Infrared Spectrometer

Low-Frequency Photoacoustic Spectroscopy of Solids

1988 ◽  
Vol 42 (2) ◽  
pp. 289-292 ◽  
Author(s):  
J. C. Donini ◽  
K. H. Michaelian
Keyword(s):  
Fourier Transform ◽  
Carbon Black ◽  
Low Frequency ◽  
Far Infrared ◽  
Research Quality ◽  
Signal To Noise ◽  
Single Spectrum ◽  
Mid Infrared ◽  
Infrared Spectrometer ◽  
Computational Procedures

Research-quality far-infrared photoacoustic (PA) spectra are obtainable with a Fourier transform infrared spectrometer, the only changes with respect to conventional mid-infrared PA spectroscopy being the use of (1) a caesium iodide or polyethylene window on the PA cell, and (2) a mylar beamsplitter. Far-infrared PA spectra of several solids (bentonite, Fe+3-bentonite, and asbestos), in addition to the PA reference carbon black, have been recorded in this way. In order to improve signal-to-noise ratios in one of the spectra, we recorded ten interferograms under identical conditions; it was found that the average of the ten individually calculated spectra displays less noise and fewer spurious features than the spectrum obtained by first averaging the interferograms and then calculating a single spectrum. The results of this investigation demonstrate the feasibility of far-infrared PA spectroscopy, and illustrate that both experimental and computational procedures should be optimized in order to obtain the most satisfactory spectra.

Broadband static Fourier transform mid-infrared spectrometer

2019 ◽  
Vol 58 (13) ◽  
pp. 3393 ◽  
Author(s):  
Michael H. Köhler ◽  
Stefan S. Naßl ◽  
Patrick Kienle ◽  
Xingchen Dong ◽  
Alexander W. Koch
Keyword(s):  
Fourier Transform ◽  
Mid Infrared ◽  
Infrared Spectrometer

scholarly journals Static Fourier transform mid-infrared spectrometer with increased spectral resolution using a stepped mirror

OSA Continuum ◽  
2020 ◽  
Vol 3 (8) ◽  
pp. 2134
Author(s):  
Michael H. Köhler ◽  
Michael Schardt ◽  
Michael Müller ◽  
Patrick Kienle ◽  
Kun Wang ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Spectral Resolution ◽  
Mid Infrared ◽  
Infrared Spectrometer

scholarly journals Low temperature mid-infrared cross-sections for peroxyacetyl nitrate (PAN) vapour

2005 ◽  
Vol 5 (4) ◽  
pp. 5669-5685
Author(s):  
G. Allen ◽  
J. J. Remedios ◽  
K. M. Smith
Keyword(s):  
Fourier Transform ◽  
Low Temperature ◽  
Absorption Spectra ◽  
Cross Sections ◽  
Spectral Resolution ◽  
Fourier Transform Infrared ◽  
Infrared Range ◽  
Peroxyacetyl Nitrate ◽  
Mid Infrared ◽  
Infrared Spectrometer

Abstract. Laboratory absorption spectra of peroxyacetyl nitrate (PAN, CH3C(O)OONO2) vapour have been measured in the mid-infrared range 550 cm−1 to 1400 cm−1 (18.2 to 7.14 µm) at both 250 K and 273 K, using a Fourier transform infrared spectrometer at a nominal spectral resolution of 0.25 cm−1 (unapodised). In addition, the 1600 cm

Mid-infrared optical fiber Fourier transform infrared spectrometer

2011 ◽  
Author(s):  
Kenneth J. Ewing ◽  
L. Brandon Shaw ◽  
Rick Kim ◽  
Rafael R. Gattass ◽  
Jas Sanghera ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Optical Fiber ◽  
Fourier Transform Infrared ◽  
Mid Infrared ◽  
Fourier Transform Infrared Spectrometer ◽  
Infrared Spectrometer ◽  
Infrared Optical Fiber

Analysis of Captan on Nitrile Glove Surfaces Using a Portable Attenuated Total Reflection Fourier Transform Infrared Spectrometer

2005 ◽  
Vol 59 (6) ◽  
pp. 724-731 ◽  
Author(s):  
R. N. Phalen ◽  
Shane S. Que Hee
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Surface Films ◽  
Airflow Rate ◽  
Infrared Spectrometer ◽  
Ftir Spectrometer ◽  
Selection Of ◽  
Solvent Volume

This study developed a method to produce uniform captan surface films on a disposable nitrile glove for quantitation with a portable attenuated total reflection Fourier transform infrared (ATR-FTIR) spectrometer. A permeation test was performed using aqueous captan formulation. Uniform captan surface films were produced using solvent casting with 2-propanol and a 25 mm filter holder connected to a vacuum manifold to control solvent evaporation. The coefficient of variation of the reflectance at 1735 ± 5 cm−1 was minimized by selection of the optimum solvent volume, airflow rate, and evaporation time. At room temperature, the lower to upper quantifiable limits were 0.31–20.7 μg/cm2 ( r = 0.9967; p ≤ 0.05) for the outer glove surface and 0.55–17.5 μg/cm2 ( r = 0.9409; p ≤ 0.05) for the inner surface. Relative humidity and temperature did not affect the uncoated gloves at the wavelength of captan analysis. Glove screening using ATR-FTIR was necessary as a control for between-glove variation. Captan permeation, after 8 hours exposure to an aqueous concentration of 217 mg/mL of Captan 50-WP, was detected at 0.8 ± 0.3 μg/cm2 on the inner glove surface. ATR-FTIR can detect captan permeation and can determine the protectiveness of this glove in the field.

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