High-Accuracy Range Detection Radar Sensor for Hydraulic Cylinders

Industrial automation requires highly precise distance measurement sensors. Accurate detection of the piston position is indispensable for the control and monitoring of hydraulic cylinder applications. Known external and integrated solutions are subject to many limitations as for example in accuracy...

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Published inIEEE sensors journal Vol. 14; no. 3; pp. 734 - 746
Main Authors Ayhan, Serdal, Scherr, Steffen, Pahl, Philipp, Kayser, Thorsten, Pauli, Mario, Zwick, Thomas
Format Journal Article
LanguageEnglish
Published IEEE 01.03.2014
Subjects
absolute range detection
Accuracy
Cavity resonators
FMCW radar
high accuracy
industrial application
oil-filled waveguide
Permittivity measurement
Radar
Sensors
Temperature measurement
Transmission line measurements
waveguide taper
waveguide transition
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Abstract Industrial automation requires highly precise distance measurement sensors. Accurate detection of the piston position is indispensable for the control and monitoring of hydraulic cylinder applications. Known external and integrated solutions are subject to many limitations as for example in accuracy, in measurement length, or in price. A promising approach consists in the use of precise and low-cost radar sensors. The developed K-band frequency modulated continuous wave (FMCW) radar system in this paper detects the piston position in a hydraulic cylinder based on the guided propagation of a radar signal. The dielectric characteristics of the hydraulic oil are obtained for this purpose by permittivity measurement methods. Influences of the hydraulic oil on wave propagation in cylindrical waveguides as well as mechanical requirements associated with this new approach are investigated. The design of an adapted oil- and pressure-resistant transition between the radar sensor and the hydraulic cylinder and a novel calibration method will be described and verified under real measurement conditions. At a measurement repetition rate of 2 kHz, an accuracy of well below 200 μm was achieved for a hydraulic cylinder of 1 m in length.
AbstractList Industrial automation requires highly precise distance measurement sensors. Accurate detection of the piston position is indispensable for the control and monitoring of hydraulic cylinder applications. Known external and integrated solutions are subject to many limitations as for example in accuracy, in measurement length, or in price. A promising approach consists in the use of precise and low-cost radar sensors. The developed K-band frequency modulated continuous wave (FMCW) radar system in this paper detects the piston position in a hydraulic cylinder based on the guided propagation of a radar signal. The dielectric characteristics of the hydraulic oil are obtained for this purpose by permittivity measurement methods. Influences of the hydraulic oil on wave propagation in cylindrical waveguides as well as mechanical requirements associated with this new approach are investigated. The design of an adapted oil- and pressure-resistant transition between the radar sensor and the hydraulic cylinder and a novel calibration method will be described and verified under real measurement conditions. At a measurement repetition rate of 2 kHz, an accuracy of well below 200 μm was achieved for a hydraulic cylinder of 1 m in length.
Author Scherr, Steffen
Ayhan, Serdal
Pauli, Mario
Kayser, Thorsten
Pahl, Philipp
Zwick, Thomas
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Snippet Industrial automation requires highly precise distance measurement sensors. Accurate detection of the piston position is indispensable for the control and...
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SubjectTerms absolute range detection
Accuracy
Cavity resonators
FMCW radar
high accuracy
industrial application
oil-filled waveguide
Permittivity measurement
Radar
Sensors
Temperature measurement
Transmission line measurements
waveguide taper
waveguide transition
Title High-Accuracy Range Detection Radar Sensor for Hydraulic Cylinders
URI https://ieeexplore.ieee.org/document/6649978
Volume 14
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