Details
| Original language | English |
|---|---|
| Article number | 5535 |
| Journal | Sensors |
| Volume | 21 |
| Issue number | 16 |
| Publication status | Published - 17 Aug 2021 |
Abstract
Certain applications require a contactless measurement to eliminate the risk of sensorinduced sample contamination. Examples can be found in chemical process control, biotechnology or medical technology. For instance, in critically ill patients requiring renal replacement therapy, continuous in‐line monitoring of blood conductivity as a measure for sodium should be considered. A differential inductive sensing system based on a differential transformer using a specific flow chamber has already proven suitable for this application. However, since the blood in renal replacement therapy is carried in plastic tubing, a direct measurement through the tubing offers a contactless method. Therefore, in this work we present a differential transformer for measuring directly through electrically non‐conductive tubing by winding the tube around the ferrite core of the transformer. Here, the dependence of the winding type and the number of turns of the tubing on the sensitivity has been analyzed by using a mathematical model, simulations and experimental validation. A maximum sensitivity of 364.9 mV/mol/L is measured for radial winding around the core. A longitudinal winding turns out to be less effective with 92.8 mV/mol/L. However, the findings prove the ability to use the differential transformer as a truly contactless sensing system.
Keywords
- Contactless measurement, Dialysis treatment, Differential inductive sensor, Differential transformer, Hose guides sample, Inductive conductivity measurement, PCB coil, Sodium monitoring, Tubing guides sample
ASJC Scopus subject areas
- Chemistry(all)
- Analytical Chemistry
- Computer Science(all)
- Information Systems
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
- Biochemistry, Genetics and Molecular Biology(all)
- Biochemistry
- Physics and Astronomy(all)
- Instrumentation
- Engineering(all)
- Electrical and Electronic Engineering
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In: Sensors, Vol. 21, No. 16, 5535, 17.08.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Differential Inductive Sensing System for Truly Contactless Measuring of Liquids’ Electromagnetic Properties in Tubing
AU - Berger, Marc
AU - Zygmanowski, Anne
AU - Zimmermann, Stefan
PY - 2021/8/17
Y1 - 2021/8/17
N2 - Certain applications require a contactless measurement to eliminate the risk of sensorinduced sample contamination. Examples can be found in chemical process control, biotechnology or medical technology. For instance, in critically ill patients requiring renal replacement therapy, continuous in‐line monitoring of blood conductivity as a measure for sodium should be considered. A differential inductive sensing system based on a differential transformer using a specific flow chamber has already proven suitable for this application. However, since the blood in renal replacement therapy is carried in plastic tubing, a direct measurement through the tubing offers a contactless method. Therefore, in this work we present a differential transformer for measuring directly through electrically non‐conductive tubing by winding the tube around the ferrite core of the transformer. Here, the dependence of the winding type and the number of turns of the tubing on the sensitivity has been analyzed by using a mathematical model, simulations and experimental validation. A maximum sensitivity of 364.9 mV/mol/L is measured for radial winding around the core. A longitudinal winding turns out to be less effective with 92.8 mV/mol/L. However, the findings prove the ability to use the differential transformer as a truly contactless sensing system.
AB - Certain applications require a contactless measurement to eliminate the risk of sensorinduced sample contamination. Examples can be found in chemical process control, biotechnology or medical technology. For instance, in critically ill patients requiring renal replacement therapy, continuous in‐line monitoring of blood conductivity as a measure for sodium should be considered. A differential inductive sensing system based on a differential transformer using a specific flow chamber has already proven suitable for this application. However, since the blood in renal replacement therapy is carried in plastic tubing, a direct measurement through the tubing offers a contactless method. Therefore, in this work we present a differential transformer for measuring directly through electrically non‐conductive tubing by winding the tube around the ferrite core of the transformer. Here, the dependence of the winding type and the number of turns of the tubing on the sensitivity has been analyzed by using a mathematical model, simulations and experimental validation. A maximum sensitivity of 364.9 mV/mol/L is measured for radial winding around the core. A longitudinal winding turns out to be less effective with 92.8 mV/mol/L. However, the findings prove the ability to use the differential transformer as a truly contactless sensing system.
KW - Contactless measurement
KW - Dialysis treatment
KW - Differential inductive sensor
KW - Differential transformer
KW - Hose guides sample
KW - Inductive conductivity measurement
KW - PCB coil
KW - Sodium monitoring
KW - Tubing guides sample
UR - http://www.scopus.com/inward/record.url?scp=85112582423&partnerID=8YFLogxK
U2 - 10.3390/s21165535
DO - 10.3390/s21165535
M3 - Article
C2 - 34450977
AN - SCOPUS:85112582423
VL - 21
JO - Sensors
JF - Sensors
SN - 1424-8220
IS - 16
M1 - 5535
ER -