Dual-Pump Coherent Anti-Stokes Raman Scattering for Simultaneous Pressure/Temperature Measurement

Foglesong, Robert E.; Green, Stephen M.; Lucht, Robert P.; Dutton, J. C.

doi:10.2514/2.7506

Cited by 37 publications

(11 citation statements)

References 18 publications

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“…Thus, one may easily find experimental works [66,144,145,[30][31][32]157,70,134,135,[191][192][193][194][195][196][197][198][199][200][201][202][203][204][205][206][207]148,151,35,77,38,39,15,64,40,142,82,123,159,42,127,59,55,51,87,60,122,150], as well as theoretical ones [133,74,…”

Section: Evolution Of the Flow Variablesmentioning

confidence: 99%

Free underexpanded jets in a quiescent medium: A review

Franquet

Perrier

Gibout

et al. 2015

Progress in Aerospace Sciences

255

113

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Section: Evolution Of the Flow Variablesmentioning

confidence: 99%

Free underexpanded jets in a quiescent medium: A review

Franquet

Perrier

Gibout

et al. 2015

Progress in Aerospace Sciences

255

113

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“…The research started with dual-pump CARS 12 measurements of pressure and temperature. 13 In the experiments of Foglesong et al, 13 the vibrational and pure rotational transitions of diatomic nitrogen were probed simultaneously in a stagnant gas cell and along the centerline of an underexpanded jet. The technique provided accurate time-averaged pressure measurements above 1 atm, as well as accurate mean and instantaneous temperature results throughout the range of 100 -300 K. Unfortunately, the method performed poorly for time-averaged pressure measurements below 1 atm and for instantaneous pressure measurements below 3 atm.…”

Section: Previous Researchmentioning

confidence: 99%

“…Both transducers are accurate to 0.5% of the pressure reading. The underexpanded jet facility is similar in design to previous investigations, 13,15 except here the nozzle exit diameter is doubled. Dry, high-pressure air is supplied to the horizontally mounted inlet pipe at approximately 9 atm.…”

Section: Experimental Facilities and Equipmentmentioning

confidence: 99%

High-Resolution Broadband N2 Coherent Anti-Stokes Raman Spectroscopy: Comparison of Measurements for Conventional And Modeless Broadband Dye Lasers

Kuehner¹,

Woodmansee²,

Lucht³

et al. 2003

Appl. Opt.

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We have performed high-resolution N2 coherent anti-Stokes Raman spectroscopy (CARS) measurements using a modeless dye laser (MDL) as the Stokes beam source to determine the effects of a reduction in mode noise on the accuracy and precision of the method. These results are compared with previous research that employed a conventional broadband dye laser (CBDL) as the Stokes beam source. A new spectral-fitting procedure was developed to avoid starting-point bias in the least-squares fitting results, which possibly had altered the previous measurements. Single-shot measurements of pressure were performed in a static-pressure vessel over the range of 0.1-4.0 atm to examine the pressure sensitivity of the technique. The precision of these measurements is a measure of the baseline noise level of the system, which sets the detection limit for flow-field pressure fluctuations. Centerline measurements of pressure and temperature in an underexpanded jet (Mj = 1.85) were also used to determine the performance of the technique in a compressible flow field. Our study represents the first known application, to our knowledge, of a MDL CARS system in a low-temperature, low-pressure supersonic environment. Improvements in accuracy for mean single-shot measurements and increased precision were found for pressure vessel conditions above 1.0 atm. For subatmospheric pressure vessel conditions (0.1-1.0 atm) and the underexpanded jet measurements, there was a decrease in accuracy and precision compared with the CBDL results. A comparison with the CBDL study is included, along with a discussion of the MDL system behavior.

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“…The work started with dual-pump CARS 11 measurements of pressure and temperature. 12 This method probed the vibrational and pure rotational transitions of diatomic nitrogen in a stagnant gas cell and along the centerline of an underexpanded jet. The technique provided accurate time-averaged pressure results above 1 atm, as well as accurate mean and instantaneous temperature results throughout the range of 100 − 300 K. Unfortunately, the method performed poorly for timeaveraged pressure measurements below 1 atm and for instantaneous pressure measurements below 3 atm.…”

Section: Introductionmentioning

confidence: 99%

High-Resolution N2 CARS Measurements of Pressure, Temperature, and Density Using a Modeless Dye Laser

Kuehner

Dutton²,

Lucht

2002

22nd AIAA Aerodynamic Measurement Technology and Ground Testing Conference

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In this study, high-resolution N 2 CARS measurements have been made using a modeless dye laser as the Stokes beam source to reduce the presence of mode noise. Along with this modification to the CARS technique, a new spectra fitting procedure was developed to avoid a starting-point bias in the leastsquares fitting results. Time-averaged and single-shot measurements of pressure were made in a static pressure vessel over the range of 0.1 to 4.0 atm to test the pressure sensitivity of the technique. In addition, the precision of single-shot measurements in the pressure vessel is indicative of the baseline pressurefluctuation detection limit of the system. The precision uncertainty of the measurements was studied to investigate the possibility of making property fluctuation measurements in high-speed flows. Centerline measurements of pressure and temperature in an underexpanded jet (M j = 1.85) were also used to determine the performance of the technique in a compressible flowfield. Improvements in accuracy for time-averaged and single-shot mean measurements and increased precision were found for pressure levels above 1.0 atm. For the subatmospheric pressure levels that are important in high-speed flows, the results indicated that the current method is incapable of making fluctuation measurements due to limited precision. Nevertheless, the increased precision above 1.0 atm indicates that fluctuation measurements may be possible with further modifications.

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Dual-Pump Coherent Anti-Stokes Raman Scattering for Simultaneous Pressure/Temperature Measurement

Cited by 37 publications

References 18 publications

Free underexpanded jets in a quiescent medium: A review

Free underexpanded jets in a quiescent medium: A review

High-Resolution Broadband N2 Coherent Anti-Stokes Raman Spectroscopy: Comparison of Measurements for Conventional And Modeless Broadband Dye Lasers

High-Resolution N2 CARS Measurements of Pressure, Temperature, and Density Using a Modeless Dye Laser

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