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Item type:Publication, Access status: with files , Powering mobile sensor nodes in fluidized beds: A non-invasive RF energy harvesting proof-of-concept(American Chemical Society (ACS), 2026-10-16); ; ; ; Real-time monitoring within industrial processing vessels is essential for advancing process analytical technology. Flow-following sensors represent an ideal approach for delivering continuous, in-line data from the process stream. However, deploying these mobile sensors is constrained by the physical barriers of sealed metallic vessels and harsh, battery-hostile environments. To overcome these limitations, a non-invasive, retrofittable wireless power transfer system is presented. The metallic vessel is structurally repurposed into a 5.23 GHz multi-mode microwave cavity resonator by coupling microwave energy through existing standard flanges. Electromagnetic simulations validate that this method generates continuous energy coverage throughout dynamic flow zones, demonstrated using a fluidized bed granulator as an application example. To harness this energy, an omnidirectional antenna and a compact RF-to-DC rectifier prototype were developed. By enabling the continuous operation of autonomous, battery-free mobile sensor nodes, this framework provides a practical, scalable foundation for high-density spatial analytics and data-driven industrial optimization.Publicationtype: Journal Article21 13 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Experiencing coupled resonance dynamics when designing with vibrotactile actuators(IEEE, 2026-06-20); ; ; ; Vibrotactile actuators are used in touchscreens to create tactile feedback and defined crispy surface dynamics. Being mounted on such plastic structures the resulting surface dynamics can differ substantially from what idle actuator specifications predict. This paper identifies the root cause as a coupled resonance interaction between the actuator’s internal spring-mass-damper-system and the structural modes of the systems, and demonstrates that this interaction is very predictable from two standard measurements performed on the actuator alone. As a representative setting five rectangular polycarbonate plates of varying thickness are studied under three conditions: bare plate, bare plate with mounted actuator as a bare mass, and actuator with free moving mass. Laser Doppler vibrometer measurements show that when the plate’s natural frequency approaches the actuator’s internal resonance, the free actuator acts as a dynamic vibration absorber (DVA), splitting the structural resonance and introducing a pronounced anti-resonance. A Rayleigh-Ritz plate model coupled to a lumped-parameter actuator model parameterised exclusively by idle and blocked test measurements predicts all three response conditions without any fitting to plate data. The results establish internal mechanical impedance as the missing design parameter in vibrotactile system integration, and motivate a standardised two-test characterisation methodology applicable across many actuator types.Publicationtype: Conference Paper33 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Impedance spectroscopy for multi-state analysis of dissolvable powders: determining layer thickness and moisture content(Elsevier, 2026-03-27); ; ; ; This study presents a novel methodology for applying Electrical Impedance Spectroscopy to analyze the electrical properties of dissolvable powders, when applied as a coating layer to quantify their thickness and moisture content. To address challenges posed by undefined geometries, powders were dissolved and applied as coatings on custom-designed Printed Circuit Board electrodes. Using sodium benzoate as a model material, the drying process was monitored in off-line measurements, revealing distinct transitions in electrical properties. Impedance and phase angle measurements effectively tracked moisture reduction during drying, while coating thickness and solution concentration also influenced conductivity. The findings demonstrate the potential of this approach for industrial applications, such as fluidized bed spray granulation, by enabling real-time monitoring of drying states.Publicationtype: Journal Article67 137 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Design of robot end-effector to be used in studying actuator-performance for vibrotactile perception in a telemanipulation setupThis paper presents an overview of a work-in-progress project, where an initial case study is done to study the performance of different vibrotactile actuators. The case study was performed on six participants. Contact forces on different samples were recorded and the participants were asked to judge the change of roughness in the sample using three different actuators. A telemanipulation setup is used to increase the accuracy of recording the contact forces. Two end-effectors were designed based on measured human stiffness in x,y, and z.Publicationtype: Conference Paper96 235