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Identifying sensing element in a resonant sensor array

The collective behaviour of a coupled array of resonant sensors can be used to reduce the bandwidth and contact count. Changes in resonance frequencies of the system can be used as sensing mechanism. This means that a large number of sensors can be monitored by using recording the resonance frequency from the response from one sensor only. One can accurately measure any amount of change in a system due to a sensory action by any one of the elements of the array; however, it is difficult to identify the individual element which has sensed. This paper reports a simple method for identifying the sensing element in a nearest neighbour coupled array of resonant sensors. Resonance frequencies measured from the response of any one element of the array are used to identify any other sensing resonator. This is achieved by using an inverse analysis utilising the forward eigenvalue perturbation, eigenvectors of the manufactured array and their inherent spread. The technique is experimentally verified using an array of identically designed MEMS resonators.