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Working languages: English to German
| sci-trans
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Native in: German | |
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More Less | | PRO-level points: 2696, Questions answered: 1096 | Sample translations submitted: 1 English to German: relaxation kinetics, signal processing
General field: Science
Detailed field: Physics | Source text - English
Kinetic Studies Using a Highly Sensitive
Microphone Detector *
Abstract
A very sensitive microphone detector is used to study fast kinetic rate processes in the gas phase resulting in the generation of heat. The rate of heat evolution in turn produces a short duration pressure pulse which drives the microphone. The frequency response of the microphone is somewhat slower than required to record these pulses as they actually appear at the detector. The theory of the method used for the data reduction is presented. It is based upon the Green's Function method which expresses the time dependent microphone signal, X, (t), [sic] as the convolution of the pressure pulse function, f(t), by the microphone's impulse response function,G(t). A Fourier analysis of X(t) and the two relevant functions, f(t) and G(t), at a single frequency, allows direct determination of the rate constant for the kinetic process under study. The method is demonstrated by applying it to the study of vibrational energy relaxation of pentafluorobenzene in argon buffer gas and gives results in agreement with other experimental methods.
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* W. Braun et al. Journal of Research of the National Institute of Standards and Technology, Vol. 93(6), 1988
| Translation - German
Kinetische Untersuchungen mit einem hochempfindlichen Mikrofon als Detektor
Abstract
Mit Hilfe eines hochempfindlichen Mikrofons wurde die Kinetik schneller, unter Wärmeerzeugung in der Gasphase ablaufender Prozesse untersucht. Abhängig von der Rate der Wärmefreisetzung entsteht ein kurzer Druckimpuls, der von dem Mikrofon detektiert wird. Da das Mikrofon wegen seiner begrenzten Bandbreite den schnellen Druckschwankungen nicht exakt folgen kann, wird der tatsächliche Druckverlauf indirekt ermittelt. Die theoretische Grundlage hierzu liefert die Methode der Greenschen Funktion, wonach der zeitliche Verlauf des Mikrofonsignals, X(t), als Faltung des Druckimpulses, f(t), mit der Impulsantwort des Mikrofons, G(t), darstellbar ist. Aus der Fourieranalyse von X(t) und der Analyse von f(t) und G(t) bei einer einzelnen Frequenz kann dann die Geschwindigkeitskonstante des betrachteten Prozesses direkt bestimmt werden. Methode und Theorie werden anhand einer Untersuchung der Schwingungsrelaxation von Pentafluorbenzol in Argon als Puffergas ausführlich dargestellt. Die Ergebnisse stimmen mit denen anderer experimenteller Methoden überein. |
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Keywords: translation, translator, academic, science, chemistry, physics, biophysics, electronics, energy, sensor, signal processing, embedded systems, scientific, environmental, medical, instruments, Übersetzung, Übersetzer, Chemie, Physik, Biophysik, Elektronik, Energie, Sensorik, Messtechnik, instrumentelle Analytik
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