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Sensors 2008, 8(12), 7833-7849; doi:10.3390/s8127833
Article

Design and Validation of a Ten-Port Waveguide Reflectometer Sensor: Application to Efficiency Measurement and Optimization of Microwave-Heating Ovens

1,* , 1
, 1
 and 2
Received: 25 October 2008; in revised form: 19 November 2008 / Accepted: 20 November 2008 / Published: 3 December 2008
(This article belongs to the Special Issue Neural Networks and Sensors)
Abstract: This work presents the design, manufacturing process, calibration and validation of a new microwave ten-port waveguide reflectometer based on the use of neural networks. This low-cost novel device solves some of the shortcomings of previous reflectometers such as non-linear behavior of power sensors, noise presence and the complexity of the calibration procedure, which is often based on complex mathematical equations. These problems, which imply the reduction of the reflection coefficient measurement accuracy, have been overcome by using a higher number of probes than usual six-port configurations and by means of the use of Radial Basis Function (RBF) neural networks in order to reduce the influence of noise and non-linear processes over the measurements. Additionally, this sensor can be reconfigured whenever some of the eight coaxial power detectors fail, still providing accurate values in real time. The ten-port performance has been compared against a high-cost measurement instrument such as a vector network analyzer and applied to the measurement and optimization of energy efficiency of microwave ovens, with good results.
Keywords: Reflectometer; microwave sensor; scattering parameter; neural calibration Reflectometer; microwave sensor; scattering parameter; neural calibration
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Pedreño-Molina, J.L.; Monzó-Cabrera, J.; Lozano-Guerrero, A.; Toledo-Moreo, A. Design and Validation of a Ten-Port Waveguide Reflectometer Sensor: Application to Efficiency Measurement and Optimization of Microwave-Heating Ovens. Sensors 2008, 8, 7833-7849.

AMA Style

Pedreño-Molina JL, Monzó-Cabrera J, Lozano-Guerrero A, Toledo-Moreo A. Design and Validation of a Ten-Port Waveguide Reflectometer Sensor: Application to Efficiency Measurement and Optimization of Microwave-Heating Ovens. Sensors. 2008; 8(12):7833-7849.

Chicago/Turabian Style

Pedreño-Molina, Juan L.; Monzó-Cabrera, Juan; Lozano-Guerrero, Antonio; Toledo-Moreo, Ana. 2008. "Design and Validation of a Ten-Port Waveguide Reflectometer Sensor: Application to Efficiency Measurement and Optimization of Microwave-Heating Ovens." Sensors 8, no. 12: 7833-7849.


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