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Matched filter for microwave-based detection of dielectric objects in powders

Johan Nohlert (Institutionen för signaler och system, Signalbehandling) ; Thomas Rylander (Institutionen för signaler och system, Signalbehandling) ; Tomas McKelvey (Institutionen för signaler och system, Signalbehandling)
I2MTC 2017 - 2017 IEEE International Instrumentation and Measurement Technology Conference, Proceedings (2017)
[Konferensbidrag, refereegranskat]

We present a microwave measurement system for detection of dielectric objects in inhomogeneous powder flows in metal pipes. The system includes a non-intrusive microwave sensor that uses multiple cavity modes to measure the permittivity inside the pipe, and a fast-sampling microwave transmitter and receiver instrument. In this paper, we study a matched filter detection algorithm that takes temporal and inter-channel correlation of the noise into account. The target waveforms used in the filter are constructed from measurements on single object passages. Based on repeated gravity-fall measurements with polyethylene powder at flow rates up to 109 kg/h, we find that wood and plastic objects of 5mm size can be detected with high accuracy, and that the matched filter detector yields minor improvements as compared to a power detector that ignores the temporal correlation.

Nyckelord: Cavity resonators, Detection algorithms, Matched filters, Maximum likelihood estimation, Microwave measurements



Denna post skapades 2017-08-23. Senast ändrad 2017-09-14.
CPL Pubid: 251337

 

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Institutioner (Chalmers)

Institutionen för signaler och system, Signalbehandling (1900-2017)

Ämnesområden

Signalbehandling

Chalmers infrastruktur