Laboratory evaluation of the Coulter On-line particle Monitor

Barnett, M.I.; Sims, E; Lines, Roy W.

doi:10.1016/0032-5910(76)80014-9

Cited by 6 publications

(1 citation statement)

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“…These challenges are related to electromagnetic noise in the measurement environment, which can weaken or even cause errors in signal recognition, and doped bubbles that approximate the size of hard particles can also create pseudo-pulses through the aperture, all of which can lead to deviations in the particle statistics. To date, although the online ESZ method has been developed [42], in-depth research on signal processing and identification algorithms are still not sufficient in industrial processes.…”

Section: Introductionmentioning

confidence: 99%

A signal analysis and identification scheme for an online multiphase micron-sized particle analyzer system

Wang¹,

Cao²,

Wang³

et al. 2021

Meas. Sci. Technol.

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Online microparticle detection is of utmost importance for industrial production. This paper proposes a signal processing and feature identification strategy to achieve particle size statistics for online measurement in a three-phase stirred tank reactor based on the electrical sensing zone (ESZ) method. Signal denoising and de-interference are achieved using the wavelet soft threshold method combined with mathematical morphological filtering. Pulse selection is implemented using pulse width limiting conditions. The key features that distinguish the pulse waveforms are defined based on the differences in the motion characteristics of the different types of particles through the aperture. Finally, the unsupervised classification algorithm balanced iterative reducing and clustering using hierarchies clustering is employed to distinguish the pulsed features between hard particles and bubbles. The results show that the particle size distribution identified by this strategy agrees with offline measurements indicating the effectiveness of the scheme. The effects of electromagnetic noise and the interference of small bubbles that approximate the particle size in solution in the online, in-situ measurement task are solved. This study scheme has a guiding and facilitating role in applying the ESZ principle to the industrial online measurement environment.

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Section: Introductionmentioning

confidence: 99%

A signal analysis and identification scheme for an online multiphase micron-sized particle analyzer system

Wang¹,

Cao²,

Wang³

et al. 2021

Meas. Sci. Technol.

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Electrozone Sensing in Particle Size Analysis

Figueiredo

2000

Encyclopedia of Analytical Chemistry

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Particle sizing is a rapidly growing field, not only because of its importance in a great variety of technological applications but also due to its outstanding relevance to numerous areas of scientific research. The currently available instruments to measure particle‐size distributions are many and varied, the results often being dependent on the measuring technique used. It is thus essential to understand the physical principles behind each technique in order to make an adequate choice. Electrozone sensing, a widely used method of particle‐size analysis, constitutes the main topic of this paper. A general description of its operating principle is provided, followed by some practical considerations mainly concerning sample preparation and the selection of electrolyte solutions and aperture tubes. Being a technique that requires prior calibration, emphasis is placed on the calibration procedures. The section dedicated to the measurement of special materials also reviews some recent improvements of this technique. Finally, a list of commercially available equipment is supplied, together with its most relevant features.

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Die On‐Line‐Messung von Partikelgrößenverteilungen in Gasen und Flüssigkeiten

Leschonski

1978

Chemie Ingenieur Technik

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Der On-Line-Messung von PartikelgroBenverteilungen kommt in der industriellen Praxis bei der kontinuierlichen Uberwachung der Produktqualitat sowie der Regelung von Produktionsprozessen eine immer starkere Bedeutung zu. Die einschlagige Industrie bietet in verstarktem MaBe MeBgerate an, die sowohl fur extrem niedrige Feststofkonzentrationen als auch fur die Analyse von Haufwerken und hochkonzentrierten Suspensionen und Aerodispersionen eine weitgehend automatische PartikelgroBenanalyse ermoglichen. Einige dieser Gerate sind meist nur im Labor bei individueller Betreuung anwendbaren Analysengeraten uberlegen. Sie ersparen dem Benutzer nicht nur Zeit und Arbeitskraft, sondern sie erschlieBen auch bereits heute eine neue Dimension in der Produktuberwachung und der Steuerung von Herstellungsprozessen. Im Rahmen dieses Referates werden die bekanntesten MeBprinzipien und MeBgerate der On-Line-PartikelgroBenmessung zusammenfassend dargestellt.On-line measurement of particle size distribution in gases and liquids. The importance of rapid response and on-line analyses ofparticle size distributions is becoming increasingly important in industry for the continuous supervision of product quality and the control of production processes. Instrument manufacturers already offer a considerable number of rapid response devices which can be used for systems with extremely low solidsconcentrationsas wellas for the analysis of bulk material and highly concentrated suspensions and aerodispersions. Some of these instruments are already superior to older methods of analysis. They not only save time and labour but have also opened a new dimension in direct supervision and control of production processes. This paper surveys the most important on-line measuring techniques and instruments. Einfuhrung in den ProblemkreisFortschritte in den Prozessen der Stoffumwandlungsverfahren der Verfahrenstechnik sind auch bei den mechanischen Verfahren von einer moglichst umfassenden Kenntnis und wissenschaftlichen Durchdringung der Grundoperationen zur Stoffumwandlung abhangig. Wissenschaftliche Erkenntnisse und der Nachweis von gesetzmal3igen Zusammenhangen bei den Grundverfahren der Stoffumwandlung sind jedoch in den meisten Fallen nur durch entsprechenden experimentellen Aufwand moglich, der eine angepaDte MeBtechnik voraussetzt. Solange es sich z. B. um die Messung von Druck, Temperatur, Kraft, Drehmoment und Drehzahl handelt, bietet die einschlagige MeBgerateindustrie eine ausreichende Auswahl von Geraten an, die zu hoher technischer Vollkommenheit entwickelt wurden. Auch die Datenverarbeitung, die Speicherung von MeDwerten usw. laRt im allgemeinen wenig Wunsche offen. In der Mechanischen Verfahrenstechnik ist jedoch die angestrebte Stoffumwandlung vor allem mit der Anderung des Dispersitatszustandes eines bestimmten Feststoffes verbunden. Bei der Auslegung eines Apparates, einer Maschine oder einer Anlage zum Zerkleinern, Mischen, Trennen, Abscheiden, Vereinigen oder Transportieren von dispersen Feststoffen ist deshalb die Kenntnis der Feinheit d...

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Laboratory evaluation of the Coulter On-line particle Monitor

Cited by 6 publications

References 0 publications

A signal analysis and identification scheme for an online multiphase micron-sized particle analyzer system

A signal analysis and identification scheme for an online multiphase micron-sized particle analyzer system

Electrozone Sensing in Particle Size Analysis

Die On‐Line‐Messung von Partikelgrößenverteilungen in Gasen und Flüssigkeiten

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