Search

Your search keyword '"Trebbels D."' showing total 13 results
Start Over Author "Trebbels D."

Refine your results

more »

more »

13 results on '"Trebbels D."'

1. Noninvasive low-cost monitoring of moisture in monumental buildings

Author

Cataldo A., De Benedetto E., Cannazza G., Demitri C., Huebner C., Trebbels D., Piuzzi E., Cataldo, A., De Benedetto, E., Cannazza, G., Demitri, C., Huebner, C., Trebbels, D., and Piuzzi, E.

Abstract

In this work, a noninvasive low-cost TDR-based system for monitoring moisture content in Cultural Heritage structures is presented. The proposed system relies on an adhesive (removable) tape, constituted by two copper strips which run parallel to each other and act as sensing element. Experimental tests were carried out by intentionally moistening a portion of a wall, and monitoring the TDR response as the moistened area naturally dried up. Preliminary results showed that, thanks to the non-invasiveness features, the proposed system is a good candidate for noninvasive monitoring of moisture in monumental buildings.

Published
2016

8. TDR application for moisture content estimation in agri-food materials

Author

Egidio De Benedetto, Christof Huebner, Andrea Cataldo, Dennis Trebbels, Cataldo, Andrea, De Benedetto, Egidio, Huebner, Christof, Trebbels, Dennis, Cataldo, A., De Benedetto, E., Huebner, C., and Trebbels, D.

Subjects
business.industry, media_common.quotation_subject, 020208 electrical & electronic engineering, 010401 analytical chemistry, Use of time, 02 engineering and technology, Agricultural engineering, Raw material, 01 natural sciences, 0104 chemical sciences, Product (business), Agriculture, 0202 electrical engineering, electronic engineering, information engineering, Food processing, Environmental science, Food material, Quality (business), Electrical and Electronic Engineering, business, Water content, Instrumentation, media_common
Abstract

Cereals and legumes are invaluable resources, as they represent the raw materials of many foods and beverages. Cereals are also largely used as livestock feeds, thus indirectly influencing the quality of dairy products and meat. Because of their key role in human nutrition and well-being, the safety and quality of these agri-food materials are extremely important topics in food science. In this regard, moisture content is one of the ultimate factors influencing the quality, safety and price of the final food product; hence, it is crucial to monitor water content of materials in the food production line. Starting from these considerations, this paper describes the use of time domain reflectometry (TDR) for both in-line and off-line moisture content sensing of agrifood materials. In particular, after a brief description of the basic principles of TDR, two representative application cases for moisture content measurements of agri-food materials are reported and commented on.

Published
2017

9. Performance comparison of TDR-based systems for permanent and diffused detection of water content and leaks

Author

E. De Benedetto, Andrea Cataldo, Christof Huebner, G. Cannazza, Dennis Trebbels, Cataldo, A., De Benedetto, E., Cannazza, G., Huebner, C., Trebbels, D., Cataldo, Andrea Maria, DE BENEDETTO, Egidio, Cannazza, Giuseppe, and Huebner, C

Subjects
Applied Mathematics, Instrumentation, 020208 electrical & electronic engineering, Real-time computing, 02 engineering and technology, Soil moisture content, 01 natural sciences, Time domain reflectometry, 010309 optics, Water leak detection, Dielectric permittivity, Performance comparison, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Environmental science, Time domain, Reflectometry, Engineering (miscellaneous), Water content, time domain reflectometry, soil moisture content, water leak detection, dielectric permittivity
Abstract

In this work, the performance of three time domain reflectometry (TDR) instruments (with different hardware architectures, specifications and costs) is comparatively assessed. The goal is to evaluate the performance of low-cost TDR instrumentation, in view of the development of a completely permanent TDR-based monitoring solution, wherein the costs of the instrument is so low, that it can be left on-site, even unguarded, and controlled remotely. Without losing generality, the applications considered for the comparative experiments are the TDR-based detection of leaks in underground pipes and, more in general, of soil water content variations. For this reason, both laboratory and in-the-field experiments are carried out by comparatively using three TDR instruments, in conjunction with wire-like sensing elements (SEs).

Published
2017

10. Controlling the irrigation process in agriculture through elongated TDR-sensing cables

Author

Giuseppe Maria D'Aucelli, Dennis Trebbels, Christof Huebner, Egidio De Benedetto, Nicola Giaquinto, Giuseppe Cannazza, Andrea Cataldo, Cataldo, Andrea, De Benedetto, Egidio, Cannazza, Giuseppe, Huebner, Christof, Trebbels, Denni, Giaquinto, Nicola, D'Aucelli, Giuseppe M., Cataldo, A., De Benedetto, E., Cannazza, G., Huebner, C., Trebbels, D., Giaquinto, N., and D'Aucelli, G. M.

Subjects
Engineering, Irrigation, Sensor networks, business.industry, 020208 electrical & electronic engineering, 010401 analytical chemistry, Bifilar coil, Process (computing), Biomedical Engineering, Agriculture, 02 engineering and technology, 01 natural sciences, 0104 chemical sciences, Soil water, Signal Processing, 0202 electrical engineering, electronic engineering, information engineering, Soil moisture, Time domain, Reflectometry, business, Water content, Wireless sensor network, Instrumentation, Remote sensing
Abstract

In this work, time domain reflectometry (TDR) is used in conjunction with an innovative type of low-cost, wirelike diffused sensor for diffused soil water content monitoring in agriculture. Thanks to its wire-like configuration, these passive, maintenance-free sensors can be rolled out and buried along the perimeter/path to be monitored (for example, along a row of plants/trees). A single sensor can be long up to 150 meters, and several sensors can be simultaneously installed in a large area, thus creating a diffused sensor network which can be controlled through a single measurement instrument. To assess the practical feasibility of the proposed TDR-based system, a practical experiment was carried out by employing a bifilar, wire-like sensing element (SE) for monitoring soil water content in a watermelon cultivation. For comparative purposes, also in view of continuous remote monitoring, measurements were carried out through three TDR instruments with different specifications and costs.

Published
2017

11. Robust Soil Water Potential Sensor to Optimize Irrigation in Agriculture.

Author

Menne D, Hübner C, Trebbels D, and Willenbacher N

Subjects
Agriculture, Porosity, Soil, Water analysis
Abstract

Extreme weather phenomena are on the rise due to ongoing climate change. Therefore, the need for irrigation in agriculture will increase, although it is already the largest consumer of water, a valuable resource. Soil moisture sensors can help to use water efficiently and economically. For this reason, we have recently presented a novel soil moisture sensor with a high sensitivity and broad measuring range. This device does not measure the moisture in the soil but the water available to plants, i.e., the soil water potential (SWP). The sensor consists of two highly porous (>69%) ceramic discs with a broad pore size distribution (0.5 to 200 μm) and a new circuit board system using a transmission line within a time-domain transmission (TDT) circuit. This detects the change in the dielectric response of the ceramic discs with changing water uptake. To prove the concept, a large number of field tests were carried out and comparisons were made with commercial soil water potential sensors. The experiments confirm that the sensor signal is correlated to the soil water potential irrespective of soil composition and is thus suitable for the optimization of irrigation systems.

Published
2022
Full Text
View/download PDF

12. Real-time cannula navigation in biological tissue with high temporal and spatial resolution based on impedance spectroscopy.

Author

Trebbels D, Jugl M, and Zengerle R

Subjects
Algorithms, Biomedical Engineering methods, Computer Simulation, Electrodes, Equipment Design, Finite Element Analysis, Heart-Lung Machine, Humans, Reproducibility of Results, Signal Processing, Computer-Assisted, Time Factors, Tissue Distribution, Dielectric Spectroscopy methods
Abstract

In many medical applications a well-directed positioning of a cannula in body tissue is mandatory. Especially the accurate placing of the cannula tip in the tissue is important for efficient drug delivery or for accessing blood vessels and nerves. This paper presents a new approach for a universal cannula navigation system based on tissue classification on the cannula tip by impedance spectroscopy. The cannula serves as coaxial, open ended waveguide which is connected to remote measurement equipment. Objective of the new system is to reach a high spatial and temporal resolution for dynamic cannula guidance. Therefore the proposed coaxial cannula design has been analyzed by Finite Element Simulation to investigate the sensitivity of the cannula tip. For fast tissue impedance spectrum measurement the Time-Domain-Reflectometry method is used in order to achieve a high temporal resolution. Measurement data derived in the laboratory is analyzed and interpreted using the general Cole-Cole model for tissue. Based on the results we propose to use a chirp signal for impedance measurement in order to improve the sensitivity of the system towards specific tissue properties.

Published
2010
Full Text
View/download PDF

13. Capacitive on-line hematocrit sensor design based on impedance spectroscopy for use in hemodialysis machines.

Author

Trebbels D, Hradetzky D, and Zengerle R

Subjects
Biomedical Engineering, Electric Impedance, Electrodes, Equipment Design, Finite Element Analysis, Humans, In Vitro Techniques, Spectrum Analysis instrumentation, Hematocrit instrumentation, Renal Dialysis instrumentation
Abstract

This paper presents a new design for an on-line and in-line hematocrit (HCT) sensor. Special feature of the sensor is the capability to measure the hematocrit of a blood sample inside standard plastic tubing widely used in medical equipment. No blood sample has to be extracted out of existing extracorporeal blood circulation systems such as hemodialysis machines or heart-lung machines. The sensor principle is based on electrical impedance spectroscopy. Dielectric properties of the blood and the plastic tubing are measured at various frequencies. In order to optimize the sensitivity, a unique electrode configuration is developed and optimized by Finite Element Simulation. The new electrode design optimizes the overall sensitivity of the sensor towards a change in dielectric properties of the blood caused by the HCT value and therefore decreases the sensitivity to side effects caused by temperature drift and component tolerances. As a result of the optimized overall sensor performance the complexity of a sensor readout circuitry can be reduced to a minimum which leads to an unmatched price-performance ratio for a complete measurement system.

Published
2009
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results