Near-infrared diode laser absorption diagnostic for temperature and water vapor in a scramjet combustor

Liu, Jonathan; Rieker, Gregory B.; Jeffries, Jay B.; Gruber, Mark; Carter, Campbell D.; Mathur, Tarun; Hanson, Ronald K.

doi:10.1364/ao.44.006701

Cited by 131 publications

(62 citation statements)

References 38 publications

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“…Wavelength modulation spectroscopy with second harmonic detection (WMS-2f) is a derivative method of direct absorption spectroscopy. 9 It has the ability to significantly improve Signal-to-Noise Ratio (SNR) for weakly absorbing features, 6 and is commended for application in harsh, noisy environments such as scramjet combustor for its high SNR.…”

Section: Measurement Techniquementioning

confidence: 99%

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Measurement of temperature, velocity and water vapor concentration in a scramjet combustor based on near-infrared diode laser absorption

et al. 2011

17th AIAA International Space Planes and Hypersonic Systems and Technologies Conference

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A multi-channel Tunable Diode Laser Absorption Spectroscopy (TDLAS) system was designed and constructed for flow parameters diagnostics in a scramjet combustor. Two fiber coupled distributed feedback (DFB) lasers with narrow line width were used to probe two H 2 O absorption features (7185.597cm (combined)) by using direct absorption Time-Division-Multiplexing (TDM) strategy at a 4-kHz repetition rate. Laser light was split into five beams and transmitted across the test region. Two motorized precision translation stages were used to move the collimators during the test, so that the three beams located near the cavity and at the exit of the combustor can scan the cross sections respectively. Flow parameters could be obtained simultaneous which included average temperature, water vapor concentration and velocity at the entrance of the combustor, the distribution of temperature, water vapor concentration at a cross section near the cavity, the distribution of temperature, water vapor concentration and velocity at the exit cross section of the combustor. The parameters of the flow entering and exiting the combustor could be used to evaluate the performance of the direct-connected scramjet facility and the combustion efficiency of the combustor. The parameters at the cross section in the combustor could also be used to analysis combustion characteristics in the combustor.

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Section: Measurement Techniquementioning

confidence: 99%

“…Line strength S of these two spectral feature were validated in literature. 6 and their laboratory-validated parameters were used in this study. …”

Section: Measurement Techniquementioning

confidence: 99%

Measurement of temperature, velocity and water vapor concentration in a scramjet combustor based on near-infrared diode laser absorption

et al. 2011

17th AIAA International Space Planes and Hypersonic Systems and Technologies Conference

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“…Water vapor absorption feature centered at 7185.597 cm -1 (i.e.,  0 ) was used in this analysis. This transition has been applied extensively in practice due to its relatively strong absorption strength at high temperatures and its isolation from interfering transitions in its vicinity [14,18].…”

Section: Simulation Resultsmentioning

confidence: 99%

“…The DA approach is simple when the absorption spectra can be obtained, which requires that a baseline can be obtained [13]. In contrast, the 2f approach utilizes the peaks in the second harmonic of the signals at both probing beams to determine Doppler   [14]. Compared with the DA approach, the 2f approach can significantly improve the signal-tonoise ratio (SNR) and therefore suitable for applications with weak absorption, and does not require a baseline and therefore applicable under high pressure [15,16].…”

Section: Mathematical and Physical Backgroundmentioning

confidence: 99%

Uncertainty Analysis of Velocity Measured by Diode-Laser Absorption Spectroscopy in a Scramjet Facility

Cai

et al. 2013

51st AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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This work investigates the error caused by non-uniformities along the line-of-sight in velocity measurement using tunable diode-laser absorption spectroscopy (TDLAS). Past work has demonstrated TDLAS as an attractive diagnostic technique for measuring velocity, which is inferred from the Doppler shift of two absorption features using two crossing laser beams. However, because TDLAS is line-of-sight in nature, the obtained velocity is a spatially-averaged value along the probing laser beams. As a result, non-uniformities in the flow can cause uncertainty in the velocity measurement. Therefore, it is the goal of this work to quantify the uncertainty caused by various non-uniformities typically encountered in practice, including boundary layer effects, the divergence/convergence of the flow, and the methods (direct absorption vs. wavelength modulation) used to fit the Doppler shift. Systematic analyses are performed to quantify the uncertainty under various conditions, and case studies are reported to illustrate the usefulness of such analysis in interpreting experimental data obtained from a scramjet facility. We expect this work to be valuable for the design and optimization of TDLAS-based velocimetry, and also for the quantitative interpretation of the measurements.

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“…1 also has been used for measurements of gas temperature in the scramjet combustor test rig at Wright-Patterson AFB, OH. 20,21 Measurements of gas temperature and water vapor concentration at kHz rates were demonstrated, using a four color sensor illustrated in Fig. 9.…”

Section: Tdl Measurements Of Gas Temperature In a Scramjet Test Famentioning

confidence: 99%

Diode Laser Sensors for Ground Testing

Hanson

Jeffries

2006

25th AIAA Aerodynamic Measurement Technology and Ground Testing Conference

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Tunable diode laser (TDL) absorption has proven highly effective for time-resolved in situ sensing of gaseous flows, and as a result such sensors are utilized increasingly in the development and control of advanced propulsion and combustion systems. Sensors using TDL absorption along a line-of-sight have the capability of fast or even continuous measurements of multiple flowfield quantities. Recent advances in TDL absorption-based sensors suggest excellent potential for development into routine diagnostic tools for a wide variety of ground-test applications. From research in our laboratory we select three aspects: (1) the development of wavelength-multiplexed absorption concepts, allowing multiple measurements along each line-of-sight; (2) ground-test applications of TDL absorption to pulse detonation engines, gas turbine sector rigs, and scramjet combustor research; and (3) extension of wavelength-multiplexed TDL sensing to hydrocarbon fuels using new wavelength-tunable mid-IR lasers.

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Near-infrared diode laser absorption diagnostic for temperature and water vapor in a scramjet combustor

Cited by 131 publications

References 38 publications

Measurement of temperature, velocity and water vapor concentration in a scramjet combustor based on near-infrared diode laser absorption

Measurement of temperature, velocity and water vapor concentration in a scramjet combustor based on near-infrared diode laser absorption

Uncertainty Analysis of Velocity Measured by Diode-Laser Absorption Spectroscopy in a Scramjet Facility

Diode Laser Sensors for Ground Testing

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