Publica
Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. Analyzing the Precision of Frequency Modulated Continuous Wave Distance and Thickness Measurements
 Institute of Electrical and Electronics Engineers IEEE; Institution of Engineering and Technology IET: 16th European Radar Conference, EuRAD 2019 : 29 September4 October 2019, Paris Piscataway, NJ: IEEE, 2019 ISBN: 9782874870576 ISBN: 9782874870545 ISBN: 9781728137339 pp.4548 
 European Radar Conference (EuRAD) <16, 2019, Paris> European Microwave Week (EuMW) <2019, Paris> 

 English 
 Conference Paper 
 Fraunhofer ITWM () 
 distance measurements; thickness measurements; precision; CramerRao lower bound; FMCW; millimeter wave; terahertz 
Abstract
Using millimeter and terahertz waves, novel solutions to nondestructive testing can be realized such as contactless distance and thickness measurements of multilayered dielectrics. Recently, we have presented a signal model based approach for the highly accurate inspection of multilayers which benefits both from frequency and phase information. In this contribution, we derive the theoretical minima of the distance and thickness variances directly considering the dependency of frequency and phase. These limits are compared with simulation and measurement results, applying different signal processing techniques. The highest precision is achieved by our signal model based correlation approach.