Optische Sensorik für die In-situ-Analytik von Brauprozessen

Schael, Frank; Engelhard, Sonja; Reich, Oliver

doi:10.1002/1522-2640(200104)73:4<381::aid-cite381>3.3.co;2-6

Cited by 3 publications

(3 citation statements)

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“…The SCABA-analyzer separates the sugar and ethanol fraction of the probe fluid by distillation, determining the concentration values of sugar in the remainder with a U-tube and ethanol in the distillate with a special ceramic sensor. Other common methods are the density-refractometer method (Drawert, 1984), the combined measurement of ultrasound velocity and density (U-tube) (Stempfl & Tavera, 1991), as well as procedures using density measurement and optical spectroscopy (Meurens & Yan, 2002;Schael, 2001). The mutual attribute to all these analytic methods is the necessity of probe preparation and a complex experimental assembly with high effort of maintenance and high cost.…”

Section: Introductionmentioning

confidence: 99%

Sensor array for the combined analysis of water–sugar–ethanol mixtures in yeast fermentations by ultrasound

Schöck

Becker

2010

Food Control

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Section: Introductionmentioning

confidence: 99%

Sensor array for the combined analysis of water–sugar–ethanol mixtures in yeast fermentations by ultrasound

Schöck

Becker

2010

Food Control

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“…B. von Reaktorgut in der chemischen Technologie oder Biotechnologie [1][2][3], in den Umweltwissenschaften [4] oder zur In-vivo-Analytik in der Biomedizin [5; 6] erleben in jüngs-ter Zeit enorme Aufmerksamkeit in Industrie und Wissenschaft. Vor allem die nicht-invasive Betriebsweise und die Verwendbarkeit von Lichtwellenleitern, die unempfindlich gegenüber äußeren elektromagnetischen Störfeldern das detektierte Lichtsignal zu einer zentralen Auswerteeinheit übertragen können, machen die optischen Techniken attraktiv.…”

Section: Introductionunclassified

In-situ-Analytik heterogener Medien mit frequenz- und leistungsmodulierten Diodenlasern (In-situ Analysis of Heterogeneous Media with Frequency and Intensity Modulated Diode Lasers)

Schael¹,

Reich²

2001

Teme

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Die elektronische Leistungs-und Frequenzmodulierbarkeit von Diodenlasern eröffnet neue Perspektiven für eine Reihe von hochempfindlichen In-situ-Analyseverfahren. Besonders für ,,heterogene" Medien aus den Bereichen der chemischen Technologie, Biotechnologie und Biomedizin, die häufig Gas-, Flüssig-und Festphase nebeneinander enthalten und starke Lichtstreuung aufweisen, ergeben sich nicht-invasive und z. T. konkurrenzlose Analysetechniken. Mit leistungsmodulierten Lasern können in den Proben Photonendichtewellen ausgelöst werden, deren Detektion und Auswertung u. a. einen nicht-invasiven Zugang zu Absorptionsund Streukoeffizient eröffnet. Der Absorptionskoeffizient gestattet qualitative und quantitative Bestimmung von Inhaltsstoffen. Der Streukoeffizient ermöglicht eine physikalische und morphologische Charakterisierung. Die vorliegende Arbeit zeigt die Anwendbarkeit entsprechender Theorien anhand von einfachen Modelllösungen und ermöglicht einen Vergleich mit Auswertungen nach der Theorie von Kubelka und Munk. Messungen von Humanblutproben werden diskutiert. Ein neues Verfahren zur Bestimmung von Porenfeuchte in Schäumen mit einem frequenzmodulierten Diodenlaser in externer Kavität wird demonstriert.Electronic intensity and frequency modulation of diode lasers enables new perspectives for highly sensitive analytical in-situ techniques. For analysis of ,,heterogeneous" media, which may consist of coexisting gaseous, liquid, and solid phases and often show multiple light scattering, non-invasive techniques with outstanding performance characteristics can be developed. Analysis of photon density waves launched by intensity-modulated lasers provide an elegant way for the determination of absorption and scattering coefficients of multiple scattering media. The absorption coefficient can be used for qualitative and quantitative analysis of chemical constituents (which absorb in the range of the laser wavelengths). The scattering coefficient allows characterization of physical and morphological properties of the sample. In the current work, applicability of appropriate radiation transport models was investigated with simple light scattering solutions and compared with results obtained from the treatment according to the theory of Kubelka and Munk. Measurements of human blood samples are discussed. A new method for determination of water vapor partial pressure in a polyurethane foam with a frequency-modulated external cavity diode laser is demonstrated. Schlagwörter: Diodenlaser, Modulationsspektroskopie, Photonendichtewellen 448 tm -Technisches Messen 68 (2001) 10  Oldenbourg Verlag

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“…PSP provides an easier alternative to conventional pressure taps to measure the pressure gradients and determine aerodynamic efficiency of a moving vehicle. Because PSP responds directly to oxygen partial pressure and not total pressure, it has been adapted for use as oxygen probes in fields such as medicine, beer manufacturing, among others.…”

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Barometric Sensitive Coatings Based upon Osmium Complexes Dissolved in a Fluoroacrylic Polymer

et al. 2008

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Pressure sensitive paints (PSP) that measure the changes in air pressure have proved to be useful in the design of aircraft and other vehicles. In this study we incorporate highly luminescent divalent osmium complexes into PSP. The divalent osmium complexes were heptafluorobutyrate salts of [Os(N-N)2(L-L)]2+ or [Os(L-L)2(N-N)]2+, where N-N is a derivative of 1,10-phenanthroline, and L-L is a diphosphine or diarsine ligand. The complexes were dissolved into poly(1,1,1,3,3,3-hexafluoroisopropylmethacrylate-co-1H,1H-dihydroperflurobutylmethacrylate) (FIB) at a concentration of 0.002 g of complex to 1.000 g of polymer. The luminescence of the coatings was tested for pressure sensitivity, temperature dependence, and photodegradation. The paints featured strong pressure response, and the temperature dependence of the luminescence was measured as low as -0.11% degrees C(-1). Several of the complexes exhibited little photodegradation upon prolonged exposure to 400 nm light. These attributes make the complexes very desirable luminescent dyes for PSP.

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Optische Sensorik für die In-situ-Analytik von Brauprozessen

Cited by 3 publications

References 0 publications

Sensor array for the combined analysis of water–sugar–ethanol mixtures in yeast fermentations by ultrasound

Sensor array for the combined analysis of water–sugar–ethanol mixtures in yeast fermentations by ultrasound

In-situ-Analytik heterogener Medien mit frequenz- und leistungsmodulierten Diodenlasern (In-situ Analysis of Heterogeneous Media with Frequency and Intensity Modulated Diode Lasers)

Barometric Sensitive Coatings Based upon Osmium Complexes Dissolved in a Fluoroacrylic Polymer

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