Intrapulse quantum cascade laser spectroscopy: pressure induced line broadening and shifting in the ν 6 band of formaldehyde

Wang, L.; Sharples, Thomas R

doi:10.1007/s00340-012-5085-7

Cited by 12 publications

(9 citation statements)

References 40 publications

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“…Two of the strongest formaldehyde (H 2 CO) v 6 band transitions around 8 μm are assigned as (1, 1, 1) ← (2, 0, 2) and (10, 1, 9) ← (9, 2, 8) centered at 1252.11231 and 1253.14392 cm −1 by Wang and Sharples. 108 Pressure-induced broadening and shift coefficients for these transitions with a variety of gases (He, Ne, Kr, Ar, N 2 ,O 2 , and CO 2 ) was also determined using pulsed DFB-QCL-based absorption spectroscopy. Lee et al 109 determined the effective line strengths of the trans conformer of nitrous acid (HONO) near 1275 cm −1 and of the cis conformer at 1660 cm −1 , both at a spectral resolution of 0.001 cm −1 by utilizing CW-QCL-based differential absorption spectroscopy.…”

Section: Selected Applications Of Quantum Cascade Laser-based Spectromentioning

confidence: 99%

Applications of Absorption Spectroscopy Using Quantum Cascade Lasers

Zhang

Тиан

et al. 2014

Appl Spectrosc

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Infrared laser absorption spectroscopy (LAS) is a promising modern technique for sensing trace gases with high sensitivity, selectivity, and high time resolution. Mid-infrared quantum cascade lasers, operating in a pulsed or continuous wave mode, have potential as spectroscopic sources because of their narrow linewidths, single mode operation, tunability, high output power, reliability, low power consumption, and compactness. This paper reviews some important developments in modern laser absorption spectroscopy based on the use of quantum cascade laser (QCL) sources. Among the various laser spectroscopic methods, this review is focused on selected absorption spectroscopy applications of QCLs, with particular emphasis on molecular spectroscopy, industrial process control, combustion diagnostics, and medical breath analysis.

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Section: Selected Applications Of Quantum Cascade Laser-based Spectromentioning

confidence: 99%

Applications of Absorption Spectroscopy Using Quantum Cascade Lasers

Zhang

Тиан

et al. 2014

Appl Spectrosc

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“…The first one is the so-called interpulse technique using typically short (5–20 ns) pulses (see [ 36 ] for example). The second one called intrapulse technique uses quite long pulses (typically 500–800 ns) (see [ 37 , 38 ] for example). However, each of these techniques has drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Widely-Tunable Quantum Cascade-Based Sources for the Development of Optical Gas Sensors

Zéninari

Vallon

Bizet

et al. 2020

Sensors

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Spectroscopic techniques based on Distributed FeedBack (DFB) Quantum Cascade Lasers (QCL) provide good results for gas detection in the mid-infrared region in terms of sensibility and selectivity. The main limitation is the QCL relatively low tuning range (~10 cm−1) that prevents from monitoring complex species with broad absorption spectra in the infrared region or performing multi-gas sensing. To obtain a wider tuning range, the first solution presented in this paper consists of the use of a DFB QCL array. Tuning ranges from 1335 to 1387 cm−1 and from 2190 to 2220 cm−1 have been demonstrated. A more common technique that will be presented in a second part is to implement a Fabry–Perot QCL chip in an external-cavity (EC) system so that the laser could be tuned on its whole gain curve. The use of an EC system also allows to perform Intra-Cavity Laser Absorption Spectroscopy, where the gas sample is placed within the laser resonator. Moreover, a technique only using the QCL compliance voltage technique can be used to retrieve the spectrum of the gas inside the cavity, thus no detector outside the cavity is needed. Finally, a specific scheme using an EC coherent QCL array can be developed. All these widely-tunable Quantum Cascade-based sources can be used to demonstrate the development of optical gas sensors.

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“…Regarding the air‐cooled heat sink evaluation, devising effective thermal management methods for electronic components are becoming increasingly difficult due to the demand for higher performance and the continual miniaturization of electronic devices. Numerous studies have been conducted to analyze heat sinks with natural convection, including the effect of pin fin orientation and pressure drop on local heat transfer, [ 18–22 ] effective fin shape and height for maximum heat transfer, [ 23–25 ] and evaluation of pin fin spacing for heat transfer improvement between a solid and a surrounding fluid. [ 26–29 ] Cuttlebone's chamber‐like structure consists of plenty of thin vertical pillars between adjacent horizontal layers, known as septa, which can serve as extended surfaces for air‐cooling enhancement.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical Analysis of a Bio‐Inspired Lightweight Multifunctional Structure

et al. 2020

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Cuttlebone constitutes the inner shell of a cuttlefish, and it has a highly porous chambered microstructure of about 93% porosity by volume. [1] Cuttlebone functions as a skeletal element and a rigid buoyancy tank, which allows the organism to control its overall density by regulating the gas/liquid ratio inside its porous structure. [2] As some cuttlefish can live up to 600 m deep in the ocean, the partially gas-filled cuttlebone is required to withstand extreme compressive loading from the water pressure (up to 60 atm). [3,4] Previous studies have suggested that cuttlebone's remarkable damage tolerance and high stiffness can be attributed to its characteristic "wall-septa" internal morphology. [5] Several previous studies on cuttlebone have explored its potential applications by exploiting its chemical, structural, and mechanical characteristics as a natural cellular material. For example, cuttlebone itself can be used as a filler in natural rubber [6] and acrylic bone cement, [7] the mechanical properties of which are comparable to commercial products. In addition, a poly coated hydroxyapatite scaffold derived from cuttlebone through a hydrothermal transformation process was shown to exhibit enhanced mechanical properties and is a good candidate for bone tissue engineering applications. [8-10] Previous research on bio-inspired structures based on cuttlebone has generally focused on structural applications, motivated by cuttlebone's low density and high strength. [1,4,11,12] Currently, little research has been carried out to explore the potential multifunctional performance of cuttleboneinspired structures. In particular, the "wall-septa" morphology of cuttlebone resembles the arrangement of a plate and pins in a typical pin-fin heat sink [13,14] as well as the sandwich structure used in an integrated thermal protection system (ITPS) for spacecraft vehicles. [15-17] The combination of high mechanical performance (stiffness and damage tolerance), low density, and pin-fin-like configuration motivates us to explore the potential thermomechanical applications of cuttlebone-inspired structures. In addition to computationally analyzing the mechanical performance of the cuttlebone structure based on high-resolution 3D structural reconstruction, this research systematically analyzes the feasibility of using cuttlebone as an inspiration for the design of novel lightweight multifunctional structures for thermal management applications, including an air-cooled heat sink for electronic devices and an ITPS for spacecraft vehicles. Regarding the air-cooled heat sink evaluation, devising effective thermal management methods for electronic components are becoming increasingly difficult due to the demand for higher performance and the continual miniaturization of electronic devices. Numerous studies have been conducted to analyze heat sinks with natural convection, including the effect of pin fin orientation and pressure drop on local heat transfer, [18-22] effective fin shape and height for maximum heat transfer, [23-25] and e...

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Intrapulse quantum cascade laser spectroscopy: pressure induced line broadening and shifting in the ν 6 band of formaldehyde

Cited by 12 publications

References 40 publications

Applications of Absorption Spectroscopy Using Quantum Cascade Lasers

Applications of Absorption Spectroscopy Using Quantum Cascade Lasers

Widely-Tunable Quantum Cascade-Based Sources for the Development of Optical Gas Sensors

Thermomechanical Analysis of a Bio‐Inspired Lightweight Multifunctional Structure

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