TY - JOUR
T1 - Linear Variable Differential Transformer in Harsh Environments - Analysis of Temperature Drifts for Different Plunger Materials
AU - Gruber, Gabriel
AU - Neumayer, Markus
AU - Schweighofer, Bernhard
AU - Wegleiter, Hannes Wegleiter
N1 - Publisher Copyright:
© 2017 IEEE.
PY - 2023/9/1
Y1 - 2023/9/1
N2 - Linear variable differential transformers (LVDTs) are precise linear position sensors capable of measuring position over a wide range. The selection of the plunger material, whether magnetic or nonmagnetic, becomes relevant in environments characterized by high temperatures and temperature variations. Especially for sensors with larger measurement ranges, the sensitivity with respect to temperature increases. In this letter, we present an LVDT design for large displacements which offers a significantly reduced sensitivity with respect to the temperature. Our design uses a plunger made from solid copper. The proposed sensor design has improved linearity and lower temperature drift with respect to existing designs, e.g., sensors with ferrite based plungers. From simulations and experiments we demonstrate a temperature stability of -28.5 to 25.5 μ m K which is comparable to other LVDT designs, which use further temperature compensation techniques. We further study the benefit of our design even for nonuniform heat distributions.
AB - Linear variable differential transformers (LVDTs) are precise linear position sensors capable of measuring position over a wide range. The selection of the plunger material, whether magnetic or nonmagnetic, becomes relevant in environments characterized by high temperatures and temperature variations. Especially for sensors with larger measurement ranges, the sensitivity with respect to temperature increases. In this letter, we present an LVDT design for large displacements which offers a significantly reduced sensitivity with respect to the temperature. Our design uses a plunger made from solid copper. The proposed sensor design has improved linearity and lower temperature drift with respect to existing designs, e.g., sensors with ferrite based plungers. From simulations and experiments we demonstrate a temperature stability of -28.5 to 25.5 μ m K which is comparable to other LVDT designs, which use further temperature compensation techniques. We further study the benefit of our design even for nonuniform heat distributions.
KW - core materials
KW - high temperature
KW - large displacements
KW - linear variable differential transformer
KW - Mechanical sensors
KW - position sensor
UR - http://www.scopus.com/inward/record.url?scp=85168752902&partnerID=8YFLogxK
U2 - 10.1109/LSENS.2023.3306981
DO - 10.1109/LSENS.2023.3306981
M3 - Article
AN - SCOPUS:85168752902
SN - 2475-1472
VL - 7
JO - IEEE Sensors Letters
JF - IEEE Sensors Letters
IS - 9
M1 - 2502904
ER -