Thermosonimetry of the NBS—ICTA temperature standards

Clark, Graham; Garlick, R. G.

doi:10.1016/0040-6031(79)87126-9

Cited by 11 publications

(6 citation statements)

References 8 publications

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“…A total of 18 time domain descriptors were investigated in this study. These were (1) the RMS voltage of the acoustic signal, (2) the peak voltage, (3) the signal area, (4) the kurtosis, ( 5 ) the crest factor, (6) the half-life, (7-10) the number of level crossings (O%, lo%, 25% and 50%) and (11)(12)(13)(14)(15)(16)(17)(18) eight normalized RMS octiles of the signal.…”

Section: Time Domain Descriptorsmentioning

confidence: 99%

Comparison of pattern recognition descriptors for chemical acoustic emission analysis

Wentzell

Lee

Wade

1991

Journal of Chemometrics

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SUMMARYFeatures used to characterize acoustic emission signals from chemical systems are evaluated with regard to their potential for pattern recognition. Eight chemical systems involving phase transitions, hydration, dissolution and effervescence are employed and treated as separate signal classes. These are compared pairwise and the discriminatory capabilities of about 50 features are investigated by computing Fisher weights. Time domain and frequency domain descriptors are examined. Correlations among the features evaluated are also reported. Recommended descriptors are the mean and median frequencies, frequency bandwidth, number of level crossings (0% and 25%), crest factor (time and frequency domains), halfIife, kurtosis and normalized percentiles of the signal and its power spectrum. The effectiveness of the recommended descriptors is demonstrated through the separation of signal classes in two different systems (melting ice and an enzyme-catalyzed gas formation reaction) by principal components analysis.

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Section: Time Domain Descriptorsmentioning

confidence: 99%

Comparison of pattern recognition descriptors for chemical acoustic emission analysis

Wentzell

Lee

Wade

1991

Journal of Chemometrics

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“…The sample solution was placed in a 250-mL glass cell containing about 0.05 g of foam which was squeezed with a glass plunger to bring fresh solution into contact with the foam. The plunger was operated by a multiple automatic apparatus (8) with an eccentric cam which gave a 5-cm stroke at a rate of 24/min. The extractions were carried out at a temperature of 25.0 ± 0.05 °C.…”

Section: Methodsmentioning

confidence: 99%

“…The use of thiocyanates as complexing reagents has served as a basis for the extraction of a number of metals (4) including some platinum metals (5-7) by several solvents. The extraction of cobalt as thiocyanate by polyurethane foam has been reported (8,9) with the distribution coefficient as high as 3 X 106.…”

Section: Reactions Studied Reaction Of Copper Sulfate Withmentioning

confidence: 99%

“…It has been shown that changes in the acoustic emission pattern of materials under stress may be indicative of mechanical deterioration, before this is evident by conventional examination. Thermosonimetry, which is essentially the monitoring of acoustic energy released by differential thermal analysis, has shown how characteristic acoustic traces are and how they may be associated with phase transitions (8). Van Ooijen et al (9) detected a sharp cracking sound accompanying the formation of a precipitate during the preparation of dichloro(pyrazine)zinc(II).…”

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confidence: 99%

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Acoustic emissions from chemical reactions

Betteridge¹,

Joslin²,

Lilley³

1981

Anal. Chem.

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“…Only recently, however, has the area drawn the attention of chemists (4)(5)(6)(7)(8)(9)(10)(11). Many dynamic chemical systems, particularly those that involve phase transitions, are acoustically active.…”

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confidence: 99%