Acoustic attenuation in gas mixtures with nitrogen: Experimental data and calculations

Ejakov, S.G.; Phillips, Susan L.; Dain, Yefim; Lueptow, Richard M.; Visser, J.H.

doi:10.1121/1.1559177

Cited by 77 publications

(77 citation statements)

References 26 publications

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“…Then we select five pairs of the experimental data given by Ejakov et al [15], they are given as the Plused-Circle in Fig. 1, and the other circles are also experimental data.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

Relaxation Time Coupling Method for Ultrasonic Sensor Design

Wang

Zhu

2016

MATEC Web of Conferences

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Abstract. In our previous work [Sens. Actuator B: Chem. 203 1-8 (2014)], a ultrasonic sensor has been proposed to detect gas compositions by the acoustic spectral peak location. However, the effective relaxation area constructed by existing theoretical model cannot match the detection method when there are more than one strong relaxational components in gas mixture. A method that calculates the relaxation time of a multi-component relaxation process is presented. Based on acquirement of decoupled relaxation times and their corresponding effective specific heat values, it calculates the whole relaxation time of a multi-component relaxation process. The method is based on the fact that for a multi-component gas mixture, such as occurs in many polyatomic gas mixtures, the relaxation process should be considered as a whole rather than being decoupled as some single relaxation processes. Acquiring relaxation time provides the approach to obtain the acoustic absorption spectral peak value directly.

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“…Then we select five pairs of the experimental data given by Ejakov et al [15], they are given as the Plused-Circle in Fig. 1, and the other circles are also experimental data.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

Relaxation Time Coupling Method for Ultrasonic Sensor Design

Wang

Zhu

2016

MATEC Web of Conferences

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“…A recent theoretical prediction [33] and experimental measurement [34] of relaxation spectra of methane show a peak near f/p = 0.1 MHz/atm. The peak shifts its position when a second gas such as nitrogen is introduced.…”

Section: Resultsmentioning

confidence: 99%

Advanced sensors for real-time control of advanced natural-gas reciprocating engine combustion.

Sheen¹,

Chien²,

Raptis

2003

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“…Note the very strong absorption by CO 2 , although this peaks at a frequency an order of magnitude lower than that for ethylene (C 2 H 4 ). Curves extracted from Petculescu et al (2006) and Dain and Lueptow (2001): see also Ejakov et al (2003). Fig.…”

Section: Discussionmentioning

confidence: 99%

Silence on Shangri-La: Attenuation of Huygens acoustic signals suggests surface volatiles

Lorenz

Leese

Hathi

et al. 2014

Planetary and Space Science

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a b s t r a c tObjective: Characterize and understand acoustic instrument performance on the surface of Titan. Methods: The Huygens probe measured the speed of sound in Titan's atmosphere with a 1 MHz pulse time-of-flight transducer pair near the bottom of the vehicle. We examine the fraction of pulses correctly received as a function of time.Results: This system returned good data from about 11 km altitude, where the atmosphere became thick enough to effectively transmit the sound, down to the surface just before landing: these data have been analyzed previously. After an initial transient at landing, the instrument operated nominally for about 10 min, recording pulses much as during descent. The fraction of pulses detected then declined and the transmitted sound ceased to be detected altogether, despite no indication of instrument or probe configuration changes. Conclusions: The most likely explanation appears to be absorption of the signal by polyatomic gases with relaxation losses at the instrument frequency, such as ethane, acetylene and carbon dioxide. These vapors, detected independently by the GCMS instrument, were evolved from the surface material by the warmth leaking from the probe, and confirm the nature of the surface materials as 'damp' with a cocktail of volatile compounds. Some suggestions for future missions are considered. Practice implications: None.

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Acoustic attenuation in gas mixtures with nitrogen: Experimental data and calculations

Cited by 77 publications

References 26 publications

Relaxation Time Coupling Method for Ultrasonic Sensor Design

Relaxation Time Coupling Method for Ultrasonic Sensor Design

Advanced sensors for real-time control of advanced natural-gas reciprocating engine combustion.

Silence on Shangri-La: Attenuation of Huygens acoustic signals suggests surface volatiles

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