Tunable diode laser measurements on nitric oxide in a hypersonic wind tunnel

Mohamed, Ajmal Khan; Rosier, Bernard; Henry, D.; Louvet, Y.; Varghese, Philip L.

doi:10.2514/3.13095

Cited by 37 publications

(8 citation statements)

References 3 publications

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“…The uncertainty in the width is estimated to be ϳ12%, and the total uncertainty in translational temperature with a range of 2000 -10,000 K is estimated to be less than 30%. 29 The total enthalpy of the arcjet plume is the sum of the kinetic energy and the enthalpy of all species in the plume. Because an arcjet plume is usually a weakly ionized plasma, as discussed above, the contributions of ionized particles and electrons are neglected in this study.…”

Section: Resultsmentioning

confidence: 99%

Diagnostics of an argon arcjet plume with a diode laser

et al. 1999

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The diode-laser absorption technique was applied for simultaneous velocity and temperature measurements of an argon plume exhausted by an arcjet. The Ar I absorption line at 811.531 nm was taken as the center absorption line. The velocity and the temperature were derived from the Doppler shift in the absorption profiles and the full width at half-maximum of the plume absorption profile, respectively. From the measured plume velocity and temperature, the total enthalpy of the exhausted plume, the thrust efficiency, and the thermal efficiency of the arcjet were derived, and the performance of the arcjet was examined. The results are demonstrated to agree with results derived by other methods, and the technique can be applied to the measurement of other arcjet systems without much modification.

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Section: Resultsmentioning

confidence: 99%

Diagnostics of an argon arcjet plume with a diode laser

et al. 1999

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“…The feasibility of simultaneous measurement of temperature, pressure and concentration of CO (or NO) in exhaust pipe gas flow has been studied. The TDLAS principle has been previously described in references [1][2][3]. Briefly the emission laser scans a small infrared spectral range which contains a rovibrational line of the target molecules.…”

Section: Introductionmentioning

confidence: 99%

<title>Automotive exhaust gas analysis by infrared tunable diode laser absorption spectroscopy</title>

et al. 1997

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Engine management optimisation and waste exhaust-gas control require engine transients measurements. The infrared tunable diode laser absorption spectroscopy (TDLAS) method can measure absolute molecule concentrations, gas temperature and pressure at high rate. The technique has been improved to measure NO or CO concentrations, as well as temperature and pressure of engine exhaust-gas. Measurements with a time resolution of one millisecond have been achieved in one ofthe cylinder exhaust pipe without any gas sampling.

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“…[3][4][5][6] Many of the optical diagnostics have the added value of flow field mapping using planar imaging techniques [5][6][7][8][9] or high-speed line-of-sight absorption/emission monitoring. [10][11][12][13][14][15][16][17][18] The latter have been recently reviewed in Reference 15. Room temperature distributed feedback (DFB) diode lasers operating at 1.31 µm, originally developed for the telecommunications industry, coincidentally overlap with weak absorption transitions of the 2 3 and 1 + 3 overtone bands of water vapor. Considering the relatively high levels of water vapor expected in combustion facilities, these standard wavelength lasers deserve careful evaluation of their capability to perform diagnostic measurements.…”

Section: Introductionmentioning

confidence: 99%

“…Testing new instrumentation in practical ground based facilities is often limited due to short test times. [16][17][18] The Air Force test facility, in contrast, provides a long duration high enthalpy flow which is well suited for testing new instrumentation and for developing meaningful statistical information regarding the sensor's performance. 19…”

Section: Introductionmentioning

confidence: 99%

Diode Laser Sensor for Gasdynamic Measurements in a Model Scramjet Combustor

2000

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A sensor for simultaneous and continuous measurements of water vapor density, temperature and velocity has been developed based on absorption techniques using room temperature diode lasers (InGaAsP) operating at 1.31 µm. Laboratory calibrations of density and temperature were acquired in a variable temperature absorption cell and on a H 2-air flat flame burner from 500 to 2200 K. Laboratory determinations showed absolute accuracies of 5% in temperature and 10% in molecular density for a 0.3 Hz bandwidth. An optical system was developed for integrating the sensor to a model SCRAMJET combustor at the Air Force Research Laboratory Wright-Patterson Air Force Base. Preliminary measurements in the Mach 2.1 flow field at expanded temperatures of 540, 650, and 740 K across an 18 cm pathlength resulted in temperature measurements that agreed with theoretical predictions to within 7 to 11%. Density measurements agreed with predictions to within 17 to 56%. Velocity measurement precision was compromised by beam steering effects, although results in reasonable agreement with predictions were observed at the lowest enthalpy condition.

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Tunable diode laser measurements on nitric oxide in a hypersonic wind tunnel

Cited by 37 publications

References 3 publications

Diagnostics of an argon arcjet plume with a diode laser

Diagnostics of an argon arcjet plume with a diode laser

<title>Automotive exhaust gas analysis by infrared tunable diode laser absorption spectroscopy</title>

Diode Laser Sensor for Gasdynamic Measurements in a Model Scramjet Combustor

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