Special Issue: Modern Sensing Technologies

Vol. 90, April 2008, pp. 209-220

Functional Link Neural Network-based Intelligent Sensors for Harsh Environments

Jagdish C. Patra¹, Goutam Chakraborty² and Subhas Mukhopadhyay³

¹School of Computer Engineering, Nanyang Technological University, Singapore

²Department of Software and Information Sciences, Iwate Prefectural University, Japan

³Department of Electrical & Electronic Engineering, Massey University (Turitea), New Zealand

E-Mail: aspatra@ntu.edu.sg, goutam@soft.iwate-pu.ac.jp, S.C.Mukhopadhyay@massey.ac.nz

 Received: 15 October 2007   /Accepted: 20 February 2008   /Published: 15 April 2008

Abstract: As the use of sensors is wide spread, the need to develop intelligent sensors that can automatically carry out calibration, compensate for the nonlinearity and mitigate the undesirable influence of the environmental parameters, is obvious. Smart sensing is needed for accurate and reliable readout of the measurand, especially when the sensor is operating in harsh environments. Here, we propose a novel computationally-efficient functional link neural network (FLNN) that effectively linearizes the response characteristics, compensates for the nonidealities, and calibrates automatically. With an example of a capacitive pressure sensor and through extensive simulation studies, we have shown that the performance of the FLNN-based sensor model is similar to that of a multilayer perceptron (MLP)-based model although the former has much lower computational requirement. The FLNN model is capable of producing linearized readout of the applied pressure with a full-scale error of only ±1.0% over a wide operating range of −50 to 200⁰ C.

Keywords: Smart sensor, Harsh environment, Functional link neural network

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