B1.3 - Characterization of the spatial resolution capability of a novel carbon fiber strain sensor based on characteristic impedance measurements
- Event
- AMA Conferences 2017
2017-05-30 - 2017-06-01
Nürnberg, Germany - Band
- Proceedings Sensor 2017
- Chapter
- B1 - Impedance Spectroscopy
- Author(s)
- R. Höhne, P. Kostka, N. Modler - Technical University of Dresden (Germany)
- Pages
- 166 - 171
- DOI
- 10.5162/sensor2017/B1.3
- ISBN
- 978-3-9816876-4-4
- Price
- free
Abstract
There is a wide application spectrum of spatial resolving strain sensors for SHM applications in industry in order to provide significant information about the condition of the structure. In this context, a novel carbon fiber strain sensor is developed. The unique feature of the sensor is a fiber-break resistive measurement principle. The proposed strain sensor is based on characteristic impedance measurements of a two-core electrical transmission path, whereby at least one conductor consists of
aligned carbon fibers fragments. The electrical time domain reflectometry (ETDR) was used in order to realize a spatial resolved strain measurement. In this contribution, the spatial resolution capability of the sensor was experimentally investigated in a cantilever arm test device. Furthermore, a Finite difference time domain (FDTD) model was established in order to simulate the ETDR signals. Special emphasis was on the identification of the relation in between electrical and mechanical behavior of the sensor. As a result, a spatial resolution in the low single-digits mm-range for engineering relevant strains was experimentally identified. The established FDTD model delivers results that are in good agreement with the experiments and thus constitutes the basis for a more comprehensive numericalassisted characterization of the sensor.