In situ sensor for cycle-resolved measurement of temperature and mole fractions in IC engine exhaust gases

Diemel, Oliver; Honza, Rene; Ding, Carl-Philipp; Böhm, Benjamin; Wagner, Steven

doi:10.1016/j.proci.2018.06.182

Cited by 29 publications

(23 citation statements)

References 18 publications

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“…Chemical information is also valuable to characterize engine exhaust with appropriate sensitivity in-situ , in real-time, on-board, with portable devices [129] , [130] , [131] , [132] . Such methods are especially useful to monitor real emissions as a function of driving performance, to assure compliance with regulations, and to provide a critical assessment of associated health risks.…”

Section: Selected Combustion Chemistry Advances – Overview and Recentmentioning

confidence: 99%

“…An in-depth overview of instrumentation to determine particulate emissions is given in [130] . Diemel et al [129] have recently demonstrated an in-situ sensor for the cycle-resolved measurement of six exhaust species, including H 2 O, CO 2 , CO, NO, NO 2 , and CH 4 . Results from their analysis are given in Fig.…”

Section: Selected Combustion Chemistry Advances – Overview and Recentmentioning

confidence: 99%

“…Estimated detection limits are reported for a signal-to-noise ratio (SNR) of SNR = 2 at effective measurement rates of 4.8 °CA (upper value) and 720 °CA (lower value). Reprinted from [129] with permission from Elsevier/The Combustion Institute. …”

Section: Selected Combustion Chemistry Advances – Overview and Recentmentioning

confidence: 99%

“…The measurements are based on tunable diode laser absorption spectroscopy (TDLAS) in the wavelength range of 1.4 µm to 5.2 µm, using a fiber-coupled sensor device with four optical channels and time-divided multiplexed detection and an effective measurement rate as high as 1 kHz [129] . The absorption length was up to about 1 m (test) and 2 m (engine), with miniature White cells for the detection of the nitrogen-containing species to enhance the sensitivity (for details see [129] ). The data in Fig.…”

Section: Selected Combustion Chemistry Advances – Overview and Recentmentioning

confidence: 99%

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Combustion in the future: The importance of chemistry

Kohse‐Höinghaus

2021

Proceedings of the Combustion Institute

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Combustion involves chemical reactions that are often highly exothermic. Combustion systems utilize the energy of chemical compounds released during this reactive process for transportation, to generate electric power, or to provide heat for various applications. Chemistry and combustion are interlinked in several ways. The outcome of a combustion process in terms of its energy and material balance, regarding the delivery of useful work as well as the generation of harmful emissions, depends sensitively on the molecular nature of the respective fuel. The design of efficient, low-emission combustion processes in compliance with air quality and climate goals suggests a closer inspection of the molecular properties and reactions of conventional, bio-derived, and synthetic fuels. Information about flammability, reaction intensity, and potentially hazardous combustion by-products is important also for safety considerations. Moreover, some of the compounds that serve as fuels can assume important roles in chemical energy storage and conversion. Combustion processes can furthermore be used to synthesize materials with attractive properties. A systematic understanding of the combustion behavior thus demands chemical knowledge. Desirable information includes properties of the thermodynamic states before and after the combustion reactions and relevant details about the dynamic processes that occur during the reactive transformations from the fuel and oxidizer to the products under the given boundary conditions. Combustion systems can be described, tailored, and improved by taking chemical knowledge into account. Combining theory, experiment, model development, simulation, and a systematic analysis of uncertainties enables qualitative or even quantitative predictions for many combustion situations of practical relevance. This article can highlight only a few of the numerous investigations on chemical processes for combustion and combustion-related science and applications, with a main focus on gas-phase reaction systems. It attempts to provide a snapshot of recent progress and a guide to exciting opportunities that drive such research beyond fossil combustion.

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Section: Selected Combustion Chemistry Advances – Overview and Recentmentioning

confidence: 99%

Section: Selected Combustion Chemistry Advances – Overview and Recentmentioning

confidence: 99%

Section: Selected Combustion Chemistry Advances – Overview and Recentmentioning

confidence: 99%

Section: Selected Combustion Chemistry Advances – Overview and Recentmentioning

confidence: 99%

See 2 more Smart Citations

Combustion in the future: The importance of chemistry

Kohse‐Höinghaus

2021

Proceedings of the Combustion Institute

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“…In the atmospheric, laminar and non-premixed CH 4 /air model flames, the concentration of CO at different heights in the flame ranges from~1 ppm to 4% [14]. The concentration of engine exhaust gases (e.g., NO and CO) in a single internal combustion engine cycle can range from~1 ppm to 0.3% (NO) and~1 ppm to 4% (CO) [15]. There is also quite a large difference in the radial profile of the HO 2 concentrations throughout the plasma effluent in an atmospheric pressure plasma jet [16].…”

Section: Introductionmentioning

confidence: 99%

A Wide-Range and Calibration-Free Spectrometer Which Combines Wavelength Modulation and Direct Absorption Spectroscopy with Cavity Ringdown Spectroscopy

Wang

Ding

et al. 2020

Sensors

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A wide-range, calibration-free tunable diode laser spectrometer is established by combining wavelength modulation and direct absorption spectroscopy (WM-DAS) with continuous wave cavity ringdown spectroscopy (CW-CRDS). This spectrometer combines the benefits of absolute concentration measurements, wide range, and high speed, using WM-DAS with enhanced noise reduction in CW-CRDS. The accurate baseline ringdown time, τ0, is calculated by the absorption peak (measured by WM-DAS) and the ringdown time containing gas absorption information (measured by CW-CRDS at the center wavelength of the spectral line). The gas concentration is obtained without measuring τ0 in real time, thus, greatly improving the measuring speed. A WM-DAS/CW-CRDS spectrometer at 1.57 μm for CO detection was assembled for experimental validation of the multiplexing scheme over a concentration ranging from 4 ppm to 1.09% (0.1 MPa, 298 K). The measured concentration of CO at 6374.406 cm−1 shows that the dynamic range of this tunable diode laser absorption spectrometer is extendable up to five orders of magnitude and the corresponding precision is improved. The measurement speed of this spectrometer can extend up to 10 ms, and the detection limit can reach 35 ppb within 25 s.

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Applications of High-Power Semiconductor Lasers in the Field of Ecological Environment Detection and Protection

Xu,

Wu,

et al. 2024

Springer Proceedings in Physics

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In situ sensor for cycle-resolved measurement of temperature and mole fractions in IC engine exhaust gases

Cited by 29 publications

References 18 publications

Combustion in the future: The importance of chemistry

Combustion in the future: The importance of chemistry

A Wide-Range and Calibration-Free Spectrometer Which Combines Wavelength Modulation and Direct Absorption Spectroscopy with Cavity Ringdown Spectroscopy

Applications of High-Power Semiconductor Lasers in the Field of Ecological Environment Detection and Protection

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