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Microwave Resonator Sensor for Detection of Dielectric Objects in Metal Pipes

Johan Nohlert (Institutionen för signaler och system, Signalbehandling) ; Thomas Rylander (Institutionen för signaler och system, Signalbehandling) ; Tomas McKelvey (Institutionen för signaler och system, Signalbehandling)
IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 11-14 May 2015, Pisa (1091-5281). p. 914-919. (2015)
[Konferensbidrag, refereegranskat]

We present a microwave sensor for detection of dielectric objects in material mixtures that are transported in metal pipes. The sensor exploits several resonant modes that operate below the cut-off frequency of the dominant waveguide mode in the pipe. This non-invasive measurement technique is particularly attractive for detection of undesirable objects in certain industries. Initial measurements on a prototype sensor show good agreement with electromagnetic simulations and indicate favorable detection properties. A detection algorithm based on the likelihood-ratio test is evaluated based on synthetically generated data from a finite-element model that simulates inhomogeneous background materials. We conclude that the multi-mode feature of the sensor is advantageous for the ability to distinguish between undesirable objects and ordinary fluctuations in the background material.

Nyckelord: microwave measurement, microwave resonator, signal detection



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Denna post skapades 2015-08-17. Senast ändrad 2016-11-30.
CPL Pubid: 220711

 

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