Infrared Spectrum of Hydrogen Fluoride: Line Positions and Line Shapes Part II Treatment of Data and Results*

Herget, William F.; Deeds, W.E.; Gailar, Norman M.; Lovell, R. J.; Nielsen, Alvin H.

doi:10.1364/josa.52.001113

Cited by 89 publications

(7 citation statements)

References 8 publications

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“…Here we use HF gas as the target analyte, which has strong absorption lines in the 2.4-2.5 µm region 37 . The modeling approach is however generic and can be readily adapted to photothermal sensors operating on other wavelengths.…”

Section: Chip-scale Optical Cavity-enhanced Photothermal Spectroscopymentioning

confidence: 99%

On-chip infrared sensors: redefining the benefits of scaling

et al. 2017

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Infrared (IR) spectroscopy is widely recognized as a gold standard technique for chemical and biological analysis.Traditional IR spectroscopy relies on fragile bench-top instruments located in dedicated laboratory settings, and is thus not suitable for emerging field-deployed applications such as in-line industrial process control, environmental monitoring, and point-of-care diagnosis. Recent strides in photonic integration technologies provide a promising route towards enabling miniaturized, rugged platforms for IR spectroscopic analysis. It is therefore attempting to simply replace the bulky discrete optical elements used in conventional IR spectroscopy with their on-chip counterparts. This size down-scaling approach, however, cripples the system performance as both the sensitivity of spectroscopic sensors and spectral resolution of spectrometers scale with optical path length. In light of this challenge, we will discuss two novel photonic device designs uniquely capable of reaping performance benefits from microphotonic scaling. We leverage strong optical and thermal confinement in judiciously designed micro-cavities to circumvent the thermal diffusion and optical diffraction limits in conventional photothermal sensors and achieve a record 104 photothermal sensitivity enhancement. In the second example, an on-chip spectrometer design with the Fellgett's advantage is analyzed. The design enables sub-nm spectral resolution on a millimeter-sized, fully packaged chip without moving parts.

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Section: Chip-scale Optical Cavity-enhanced Photothermal Spectroscopymentioning

confidence: 99%

On-chip infrared sensors: redefining the benefits of scaling

et al. 2017

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“…The absorption is so weak, however, other techniques such as the spectrophone should be used for purposes of comparison, or in place of White cell measurements if paths of several kilometers and good signal-to-noise is not available. therefor .re expected to be rather accurate compared to CH 4 and HDO, and measurement of N 2 0 absorption at DF wavelength is straightforward using conventiona techniques.…”

Section: Vmentioning

confidence: 99%

“…For v, < , c. the Lorentz form is assumed. Other expressions have also been used to describe non-Lorentz behavior not too far from line center [3,4].…”

mentioning

confidence: 99%

“…These are the selection of priorities for the choice of mo~'lecule and individupl lines to investigate and the selection of the method of performing From the standpoint of the DFP propagation problem, the major contributions, in order of decreasing contribution to absorption, are as follows: For very dry conditions, or at altitude, priorities will shift to a better understanding of the line absorption of the uniformly mixed gases. The species N 2 0, CH 4 and H1 2 0 are grouped together since each can be quite important at several specific wavelengths. H 2 0 occurs only at several DF wavelengths, but of these, H 2 0 often is the dominant absorber.…”

mentioning

confidence: 99%

“…H 2 0 occurs only at several DF wavelengths, but of these, H 2 0 often is the dominant absorber. There is more DF absorption by N 2 0 than by either CH 4 or H 2 0, but the latter occur at more transparent wavelengths, and therefore are wavelengths of greatest interest and potential value.…”

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confidence: 99%

See 2 more Smart Citations

Investigation of DF Laser Propagation

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Tuer²,

Woods³

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Resolution enhancement of x‐ray photoelectron spectra by maximum entropy deconvolution

Splinter

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The maximum entropy method (MEM) is applied to the deconvolution of x‐ray photoelectron spectra. This method provides the least‐biased estimate of the unbroadened spectrum by using the Shannon information content as the regularizing functional. The large‐scale, non‐linear optimization problem is solved using a robust variable metric sequential‐quadratic programming (SQP) algorithm implemented on a personal computer (PC). The program is tested on simulated spectra and then shown to provide reliable resolution enhancement of measured spectra by unfolding a measured instrumental resolution function. Typical resolution enhancements of 50% are achievable in <15 min of computer time. © 1998 John Wiley & Sons, Ltd.

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Infrared Spectrum of Hydrogen Fluoride: Line Positions and Line Shapes Part II Treatment of Data and Results*

Cited by 89 publications

References 8 publications

On-chip infrared sensors: redefining the benefits of scaling

On-chip infrared sensors: redefining the benefits of scaling

Investigation of DF Laser Propagation

Resolution enhancement of x‐ray photoelectron spectra by maximum entropy deconvolution

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