High-bandwidth absorption-spectroscopy measurements of temperature, pressure, CO, and H$$_2$$O in the annulus of a rotating detonation rocket engine

Mathews, Garrett C.; Blaisdell, Matthew G.; Lemcherfi, Aaron; Slabaugh, Carson D.; Goldenstein, Christopher S.

doi:10.1007/s00340-021-07703-9

Cited by 30 publications

(9 citation statements)

References 43 publications

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“…However, it is more difficult to model and resolve the NO 2 spectrum under the presence of blended neighboring features and the broad spectral interference from H 2 O, especially when H 2 O absorbance is of a magnitude equivalent to NO 2 . Previous works have demonstrated the potential of higher harmonics in the application of broad absorbance [ 43 , 44 ]. In this work, we used the fourth-harmonic signal for NO 2 detection due to its H 2 O sensitivity reduction.…”

Section: Tdlas Diagnostics For No and Nomentioning

confidence: 99%

In Situ Measurement of NO, NO2, and H2O in Combustion Gases Based on Near/Mid-Infrared Laser Absorption Spectroscopy

Liu

et al. 2022

Sensors

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In this study, a strategy was developed for in situ, non-intrusive, and quantitative measurement of the oxides of nitrogen (NO and NO2) to describe emission characteristics in gas turbines. The linear calibration-free wavelength modulation spectroscopy (LCF-WMS) approach combined with the temperature profile-fitting strategy was utilized for trace NO and NO2 concentration detection with broad spectral interference from gaseous water (H2O). Transition lines near 1308 nm, 5238 nm, and 6250 nm were selected to investigate the H2O, NO, and NO2 generated from combustion. Experiments were performed under different equivalence ratios in a combustion exhaust tube, which was heated at 450–700 K, with an effective optical length of 1.57 m. Ultra-low NOx emissions were captured by optical measurements under different equivalence ratios. The mole fractions of H2O were in agreement with the theoretical values calculated using Chemkin. Herein, the uncertainty of the TDLAS measurements and the limitation of improving the relative precision are discussed in detail. The proposed strategy proved to be a promising combustion diagnostic technique for the quantitative measurement of low-absorbance trace NO and NO2 with strong H2O interference in real combustion gases.

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Section: Tdlas Diagnostics For No and Nomentioning

confidence: 99%

In Situ Measurement of NO, NO2, and H2O in Combustion Gases Based on Near/Mid-Infrared Laser Absorption Spectroscopy

Liu

et al. 2022

Sensors

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“…Therefore, lots of laser-based sensors for combustion field diagnosis have been developed by using different variant tunable diode absorption spectroscopy (TDLAS), for example, direct absorption spectroscopy (DAS) [1][2][3] and wavelength absorption spectroscopy (WMS). [4][5][6][7] Compared with DAS techniques, WMS is more attractive in detecting a weak absorption of target gas via injecting a modulation current with high frequency (tens or hundreds of kHz) to restrain low-frequency (1/f) noise. 8,9 While traditional WMS requires calibration for its signal dependence on absorbance, which is unsuitable for high-temperature and high-pressure gas detection in combustion field.…”

Section: Introductionmentioning

confidence: 99%

“…Laser absorption spectroscopy, an important laser‐based diagnostic approach, has promising potential for real‐time measurements of combusting gas temperature, concentration, and velocity due to its advantages of high precision, rapid response and noninvasive measurements. Therefore, lots of laser‐based sensors for combustion field diagnosis have been developed by using different variant tunable diode absorption spectroscopy (TDLAS), for example, direct absorption spectroscopy (DAS) 1–3 and wavelength absorption spectroscopy (WMS) 4–7 …”

Section: Introductionmentioning

confidence: 99%

High‐pressure gas temperature sensing for exit plane of aero‐engine combustor using tunable diode laser absorption spectroscopy

Huang,

Xu,

Deng

et al. 2023

Micro & Optical Tech Letters

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We have developed a sensor for the temperature measurement in the test section after the combustion chamber of an aero engine model by using direct absorption spectroscopy. Five distributed feedback diode lasers at near 1392, 1393, 1339, 1343, and 1469 nm are utilized as the light sources to detect H2O absorptions to improve the precision of temperature measurement combining with the Boltzmann plot method and the polynomial‐based spectral fitting model. The sensor shows a good performance in terms of its temperature measurement accuracy under high temperature of 673–1373 K and high pressure of 100–600 kPa condition in a tube furnace, which was lower than 4%. Moreover, three‐dimensional temperature distributions have been reconstructed via applying algebraic reconstruction technique at the test section after the combustion chamber of an aero engine model. The single‐point position temperature extracted from the algebraic reconstruction technique agrees well with that measured from the coherent anti‐stokes Raman scattering technique, where the relative error is within 5%. All the above results prove the reliability of our developed temperature sensor.

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“…[6] It is similar to the realization of resonant enhancements in artificial photonic structures: [7][8][9][10][11][12] Both the peak wavelength and bandwidth of the illumination are important parameters to leverage the trade-off between the efficiency and operational regime of the nonlinear light and matter interaction. [10][11][12] Additionally, the spectral responses of matter can vary from the different environments (e.g., pressure, [13] temperature, and pH value [14] ), structure arrangement, [7,8] and the coupling modes of incident waves [9] Therefore, the pursuit of fully controlling the spectral peak and bandwidth of laser sources contributes to the realization of versatile laser tools for investigating nonlinear applications.…”

Section: Introductionmentioning

confidence: 99%

Widely Tunable Femtosecond Sources with Continuously Tailorable Bandwidth Enabled by Self‐Phase Modulation

Chou

Hung

Liu

et al. 2023

Laser & Photonics Reviews

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Generating ultrafast pulses with better spectrotemporal control is crucial for optimizing and characterizing nonlinear light–matter responses, yet it is limited by the gain bandwidth of laser media or the phase‐matching geometry of nonlinear processes. This work proposes a simple approach to independently manage a femtosecond source's spectral location and bandwidth. Self‐phase‐modulation‐enabled spectral broadening is first analyzed, which is potentially energy‐scalable using hollow‐core capillaries or multipass cells. It is demonstrated that the outmost lobes in the broadened spectrum show different dependencies on the initial pulse energy and duration. A simple yet effective toy model is introduced that successfully predicts broadband spectral tuning, and the impact of other nonlinear effects, dispersion, and input pulse asymmetry on the experimental scenario is also discussed. Thus a fiber‐based versatile source is demonstrated, which is compressible down to its transform‐limit duration, as short as 12.2 fs centered at 920 nm. In addition, bandwidth‐dependent third‐harmonic generation spectroscopy is performed from a dielectric metasurface with an optimized nonlinear response, and the dependency of laser bandwidth and pulse duration is investigated on the signal‐to‐background ratio of two‐photon images. It is believed that this demonstration will advance the investigation of bandwidth‐dependent nonlinear spectroscopy and microscopy.

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High-bandwidth absorption-spectroscopy measurements of temperature, pressure, CO, and H$$_2$$O in the annulus of a rotating detonation rocket engine

Cited by 30 publications

References 43 publications

In Situ Measurement of NO, NO2, and H2O in Combustion Gases Based on Near/Mid-Infrared Laser Absorption Spectroscopy

In Situ Measurement of NO, NO2, and H2O in Combustion Gases Based on Near/Mid-Infrared Laser Absorption Spectroscopy

High‐pressure gas temperature sensing for exit plane of aero‐engine combustor using tunable diode laser absorption spectroscopy

Widely Tunable Femtosecond Sources with Continuously Tailorable Bandwidth Enabled by Self‐Phase Modulation

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