Development of a Compact and Robust Mid-Infrared Spectrometer by Using a Silicon/Air Hyperspectral Filter

ACS Photonics ◽  
2021 ◽  
Author(s):  
Taeyoon Jeon ◽  
Amirhossein Nateghi ◽  
William Max Jones ◽  
Changsoon Choi ◽  
Juan Pablo Cardenas ◽  
...  
Keyword(s):  
Mid Infrared ◽  
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.

Mid-Infrared Spectrometer on the Infrared Telescope in Space

1993 ◽  
Author(s):  
Thomas L. Roellig ◽  
Takashi Onaka ◽  
Thomas J. McMahon ◽  
Toshihiko Tanabe
Keyword(s):  
Mid Infrared ◽  
Infrared Telescope ◽  
Infrared Spectrometer

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 Mid-infrared spectroscopy of Uranus from the Spitzer infrared spectrometer: 2. Determination of the mean composition of the upper troposphere and stratosphere

Icarus ◽  
2014 ◽  
Vol 243 ◽  
pp. 471-493 ◽  
Author(s):  
Glenn S. Orton ◽  
Julianne I. Moses ◽  
Leigh N. Fletcher ◽  
Amy K. Mainzer ◽  
Dean Hines ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Mid Infrared ◽  
Mid Infrared Spectroscopy ◽  
Upper Troposphere ◽  
Infrared Spectrometer ◽  
The Mean

scholarly journals The mid-infrared spectral characteristics of blazars

2014 ◽  
Vol 10 (S313) ◽  
pp. 93-94
Author(s):  
Howard A. Smith ◽  
F. Massaro ◽  
R. D'Abrusco ◽  
A. Paggi ◽  
P. Cowperthwaite ◽  
...  
Keyword(s):  
Large Fraction ◽  
Spectral Characteristics ◽  
Continuum Emission ◽  
Spectral Features ◽  
Mid Infrared ◽  
Infrared Spectral ◽  
Infrared Spectrometer ◽  
Γ Ray ◽  
Followup Studies ◽  
The Continuum

AbstractWe previously reported discovering that blazars have distinctive infrared colors as seen in the WISE mission. Of particular note are γ-ray blazars, the locus of whose colors roughly overlaps with QSOs contours but which is more tightly delimited and bluer than ULIRGs and Seyferts. Since a large fraction of γ-ray sources are unassociated with any point source, but are expected to be blazars, identifying a WISE-candidate blazar in the γ-ray source field enables efficient followup studies. In an effort to better understand why blazars have these colors, we reduced and analyzed Spitzer Infrared Spectrometer (IRS) measurements on 73 blazars of varying types, some at several epochs. These spectra can be used to study the continuum emission (non-thermal), and search for atomic or other spectral features.

scholarly journals MIRSI: a Mid-InfraRed Spectrometer and Imager

2003 ◽  
Author(s):  
Lynne K. Deutsch ◽  
Joseph L. Hora ◽  
Joseph D. Adams ◽  
Marc Kassis
Keyword(s):  
Mid Infrared ◽  
Infrared Spectrometer

Near- versus Mid-Infrared Diffuse Reflectance Spectroscopy for the Quantitative Determination of the Composition of Forages and By-Products

1994 ◽  
Vol 2 (1) ◽  
pp. 49-57 ◽  
Author(s):  
James B. Reeves
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Diffuse Reflectance ◽  
Near Infrared ◽  
Reflectance Spectroscopy ◽  
In Vitro Digestibility ◽  
Mid Infrared ◽  
Infrared Spectrometer ◽  
By Products

The objective of this work was to explore the relative value of near- and mid-infrared diffused reflectance spectroscopy in determining the composition of forages and by-products. Sixty-seven samples consisting of 15 alfalfa, 16 tall fescue and 15 orchard grass hays, 10 corn stovers and 11 wheat straws at various stages of maturity were examined by diffuse reflectance using a scanning monochromator (1100–2500 nm), a Fourier near infrared spectrometer (10,000–4000 cm−1, 4 and 16 cm−1 resolution, neat and 5% sample in KBr) and a Fourier mid-infrared spectrometer (4000–400 cm−1, 4 and 16 cm−1 resolution, neat and 5% sample in KBr). Samples were analysed chemically and spectroscopically for fibres, in vitro digestibility, crude protein, nitrobenzene oxidation products and various measures of lignin content. The results showed that diffuse mid-infrared reflectance spectroscopy can perform as well as, and sometimes better than, diffuse near infrared spectroscopy in determining the composition of forages and by-products. In addition, Fourier near infrared spectroscopy did not perform as well as either near infrared using a scanning monochromator or the Fourier mid-infrared spectrometer. Finally, diluting samples with KBr was not beneficial for either Fourier based determinations. Additional work with more diverse data sets and various Fourier instrument configurations will be needed to further define the limits and usefulness of Fourier transform near- and mid-infrared spectroscopy in the determination of forage and by-product composition.

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 Autonomous airborne mid-infrared spectrometer for high-precision measurements of ethane during the NASA ACT-America studies

2020 ◽  
Vol 13 (11) ◽  
pp. 6095-6112
Author(s):  
Petter Weibring ◽  
Dirk Richter ◽  
James G. Walega ◽  
Alan Fried ◽  
Joshua DiGangi ◽  
...  
Keyword(s):  
High Precision ◽  
Trace Gas ◽  
Considerable Effort ◽  
Mid Infrared ◽  
Sources And Sinks ◽  
Direct Absorption Spectroscopy ◽  
Airborne Measurement ◽  
Infrared Technology ◽  
Instrument Control ◽  
Infrared Spectrometer

Abstract. An airborne trace gas sensor based on mid-infrared technology is presented for fast (1 s) and high-precision ethane measurements during the Atmospheric Carbon and Transport-America (ACT-America) study. The ACT-America campaign is a multiyear effort to better understand and quantify sources and sinks for the two major greenhouse gases carbon dioxide and methane. Simultaneous airborne ethane and methane measurements provide one method by which sources of methane can be identified and quantified. The instrument described herein was operated on NASA's B200 King Air airplane spanning five separate field deployments. As this platform has limited payload capabilities, considerable effort was devoted to minimizing instrument weight and size without sacrificing airborne ethane measurement performance. This paper describes the numerous features designed to achieve these goals. Two of the key instrument features that were realized were autonomous instrument control with no onboard operator and the implementation of direct absorption spectroscopy based on fundamental first principles. We present airborne measurement performance for ethane based upon the precisions of zero air background measurements and ambient precision during quiescent stable periods. The airborne performance was improved with each successive deployment phase, and we summarize the major upgraded design features to achieve these improvements. During the fourth deployment phase in the spring of 2018, the instrument achieved 1 s (1σ) airborne ethane precisions reproducibly in the 30–40 parts per trillion by volume (pptv) range in both the boundary layer and the less turbulent free troposphere. This performance is among some of the best reported to date for fast (1 Hz) airborne ethane measurements. In both the laboratory conditions and at times during calm and level airborne operation, these precisions were as low as 15–20 pptv.

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