Details
| Original language | English |
|---|---|
| Article number | 2365 |
| Journal | Sensors |
| Volume | 21 |
| Issue number | 7 |
| Publication status | Published - 29 Mar 2021 |
Abstract
The electrical and dielectric properties of liquids can be used for sensing. Specific appli-cations, e.g., the continuous in-line monitoring of blood conductivity as a measure of the sodium concentration during dialysis treatment, require contactless measuring methods to avoid any contam-ination of the medium. The differential transformer is one promising approach for such applications, since its principle is based on a contactless, magnetically induced conductivity measurement. The objective of this work is to investigate the impact of the geometric parameters of the sample or medium under test on the sensitivity and the noise of the differential transformer to derive design rules for an optimized setup. By fundamental investigations, an equation for the field penetration depth of a differential transformer is derived. Furthermore, it is found that increasing height and radius of the medium is accompanied by an enhancement in sensitivity and precision.
Keywords
- Contactless measurement, Differential transformer, Filed penetration depth, Magnetic coupling, Magnetic induced conductivity measurement, PCB coil
ASJC Scopus subject areas
- Chemistry(all)
- Analytical Chemistry
- Biochemistry, Genetics and Molecular Biology(all)
- Biochemistry
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
- Physics and Astronomy(all)
- Instrumentation
- Engineering(all)
- Electrical and Electronic Engineering
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In: Sensors, Vol. 21, No. 7, 2365, 29.03.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - How Geometry Affects Sensitivity of a Differential Transformer for Contactless Characterization of Liquids
AU - Berger, Marc
AU - Zygmanowski, Anne
AU - Zimmermann, Stefan
PY - 2021/3/29
Y1 - 2021/3/29
N2 - The electrical and dielectric properties of liquids can be used for sensing. Specific appli-cations, e.g., the continuous in-line monitoring of blood conductivity as a measure of the sodium concentration during dialysis treatment, require contactless measuring methods to avoid any contam-ination of the medium. The differential transformer is one promising approach for such applications, since its principle is based on a contactless, magnetically induced conductivity measurement. The objective of this work is to investigate the impact of the geometric parameters of the sample or medium under test on the sensitivity and the noise of the differential transformer to derive design rules for an optimized setup. By fundamental investigations, an equation for the field penetration depth of a differential transformer is derived. Furthermore, it is found that increasing height and radius of the medium is accompanied by an enhancement in sensitivity and precision.
AB - The electrical and dielectric properties of liquids can be used for sensing. Specific appli-cations, e.g., the continuous in-line monitoring of blood conductivity as a measure of the sodium concentration during dialysis treatment, require contactless measuring methods to avoid any contam-ination of the medium. The differential transformer is one promising approach for such applications, since its principle is based on a contactless, magnetically induced conductivity measurement. The objective of this work is to investigate the impact of the geometric parameters of the sample or medium under test on the sensitivity and the noise of the differential transformer to derive design rules for an optimized setup. By fundamental investigations, an equation for the field penetration depth of a differential transformer is derived. Furthermore, it is found that increasing height and radius of the medium is accompanied by an enhancement in sensitivity and precision.
KW - Contactless measurement
KW - Differential transformer
KW - Filed penetration depth
KW - Magnetic coupling
KW - Magnetic induced conductivity measurement
KW - PCB coil
UR - http://www.scopus.com/inward/record.url?scp=85103111682&partnerID=8YFLogxK
U2 - 10.3390/s21072365
DO - 10.3390/s21072365
M3 - Article
C2 - 33805361
AN - SCOPUS:85103111682
VL - 21
JO - Sensors
JF - Sensors
SN - 1424-8220
IS - 7
M1 - 2365
ER -