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Digitale Medien

Imaging spectroscopy of the nonequilibrium shock front radiation in air (1998)

Koreeda, J. ; Ohama, Y. ; Honma, H.

Springer

Shock waves 8 (1998), S. 71-78

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ISSN: 1432-2153

Schlagwort(e): Key words: Nonequilibrium radiation, Imaging spectroscopy, Strong shock waves

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik , Technik allgemein

Notizen: Abstract. The nonequilibrium radiation of shock fronts in air is experimentally investigated by means of the imaging spectroscopy technique. Shock velocity ranges from 9.7 to 11.6 km/s and initial pressure from 13.3 to 41.6 Pa. The spectral diagnostic system consists of an imaging spectrograph, a streak camera, a gated image-intensified CCD camera and a personal computer for data acquisition/processing. This spectral diagnostic system is capable of simultaneous wavelength-, intensity- and time-resolved spectroscopic measurements in the nanosecond order. The image processing of the streak images includes a combined smoothing/deconvolution process in the time direction to diminish experimental noise effects and the temporal broadening due to the streak camera entrance slit. Wavelength range is chosen to investigate the first negative band of $ N_{2}^{+}$ . “Large” and “slim” streak image types are observed. In the “large” streak images greater contribution from $N_{2}^{+}$ (1-)(1,0) behind the radiation peak is observed. Experimental data are compared with a streak image numerically simulated. The numerical simulation agrees better with the “slim” streak image.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s001930050100

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Digitale Medien

Density reconstruction from laser schlieren signal in shock tube experiments (1998)

Bystrov, S.A. ; Honma, H. ; Ivanov, V.I. ; [weitere]

Springer

Shock waves 8 (1998), S. 183-189

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ISSN: 1432-2153

Schlagwort(e): Key words:Laser schlieren, Shock wave structure, Ill-posed problem, Regularization method

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik , Technik allgemein

Notizen: Abstract. Using a diffraction approach the convolution-type integral equation for the laser schlieren signal created by an arbitrary disturbance at low pressure, where refractive index of disturbance is close to unity, in a shock tube (thin optical layer) has been deduced. In the equation electric circuit relaxation processes were taken into account by a response function. The equation was solved with the aid of the regularization method worked out for ill-posed problems. The density structures of the strong shock waves in air have numerically been reconstructed from experimental data ranging shock wave Mach number of $M_s=20$ –30, and $P_0=10$ –30 Pa.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s001930050112

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