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Vol. 141, No. 6, June 2012, pp. 71-91

 

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Synchronization Based SAW Sensor Using Delay line Coupled Dual Oscillator Phase Dynamics

 

Shashank S. JHA and R. D. S. YADAVA

Sensor & Signal Processing Laboratory

Department of Physics, Faculty of Science

Banaras Hindu University, Varanasi 221005, India

Tel.: +91-9450246572, E-mail: ardius@gmail.com, ardius@bhu.ac.in

 

Received: 6 June 2012   /Accepted: 27 June 2012   /Published: 30 June 2012

 

Digital Sensors and Sensor Sysstems

 

Abstract: This paper presents an analysis of synchronization between two coupled nonlinear surface acoustic wave (SAW) delay line oscillators where coupling is provided via another linear phase SAW delay line. The analysis is aimed at determining the sensitivity of synchronization frequency for perturbations in the coupling SAW delay line, and then to explore whether the coupling SAW device can be used for making a better chemical sensor in comparison to the usual polymer-coated SAW delay line oscillator sensor. Two nearly identical free running SAW delay line oscillators with stable amplitude and weak coupling conditions are considered. The dynamics of coupled system is analysed for small perturbations in limit cycles under phase approximation. The system represents nonlinear dynamics of a generic system of two phase coupled self-sustained oscillators with delayed-feedback and delayed coupling. The relations for synchronization frequency and sensitivity for delay perturbations are obtained. Considering the noise suppression characteristics and high sensitivity regions of synchronization it is found that the coupled SAW oscillators in synchronized states have potential for making high performance SAW sensors.

 

Keywords: Coupled SAW oscillators, Synchronization, SAW sensors, Coupled oscillators with delayed feedback and delayed coupling

 

 

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