The specific surface area of the dispersed phase in suspensions, emulsions, bubble columns and aerosols plays a decisive role in the increasement of heat and mass transfer processes. This has a direct effect on the space-time yield in large-scale chemical/process engineering production plants. Initial investigations show that an easy-to-install optical backscatter sensor outputs the dispersed surface area as a direct primary signal under certain boundary conditions. The article describes the construction, the mode of operation and first investigations applying of this new sensor. The sensor works even in high concentrated suspensions and emulsions, where conventional nephelometry already fails. Trends and limitations found so far for the sensor, which can be used in-line in batch and continuously operated crystallizers, even in harsh production environments and in potentially explosive zones, are shown.
One of the main topics within research activities is the management of research data. Large amounts of data acquired by heterogeneous scientific devices, sensor systems, measuring equipment, and experimental setups have to be processed and ideally be managed by Findable, Accessible, Interoperable, and Reusable (FAIR) data management approaches in order to preserve their intrinsic value to researchers throughout the entire data lifecycle. The symbiosis of heterogeneous measuring devices, FAIR principles, and digital twin technologies is considered to be ideally suited to realize the foundation of reliable, sustainable, and open research data management. This paper contributes a novel architectural approach for gathering and managing research data aligned with the FAIR principles. A reference implementation as well as a subsequent proof of concept is given, leveraging the utilization of digital twins to overcome common data management issues at equipment-intense research institutes. To facilitate implementation, a top-level knowledge graph has been developed to convey metadata from research devices along with the produced data. In addition, a reactive digital twin implementation of a specific measurement device was devised to facilitate reconfigurability and minimized design effort.
This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.Der Einsatz von faseroptischen Rückstreusensoren zur Inline-Ü berwachung der Partikelkonzentration in hochgefüllten Dispersionen und Lacksystemen wird dargestellt. Durch die Miniaturisierung des Abstandes zwischen Sender-und Empfängerfaser auf < 600 mm kann das eingetragene Licht auch hohe Dispersphasenanteile von bis zu 60 % durchdringen. Aufgrund der Messanordnung finden sich sowohl Transmissions-als auch Streueinflüsse im resultierenden Signal. Es folgt eine mögliche Beschreibung der sich ergebenden nichtlinearen Messkurve mittels eines vereinfachten Modells. Schlagwörter: Faseroptische Rückstreusensoren, Hochgefüllte Dispersionen, Inline-Ü berwachung, PhotometrieThe use of fiber-optic backscattering sensors for inline monitoring of the particle concentration in highly filled dispersions and lacquer systems is shown. Through the miniaturization of the distance between transmitter and detection fiber to < 600 mm, the light can also permeate high disperse phase fractions of up to 60 %. Due to the measurement setup, both transmission and scattering effects can be found in the resulting signal. The possible mathematical description of the resulting nonlinear measured curve using a simplified model follows.
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