Patent ID: 7771987

Claim:
An acoustic wave sensor assembly including: piezoelectric material; a first acoustic wave resonator element structure mounted on the piezoelectric material for interacting with an electrical signal; said acoustic wave resonator element structure being operable to interact with an acoustic wave propagating within the piezoelectric material to produce a first frequency response; further acoustic wave resonator element structures mounted on the piezoelectric material for interacting with electrical signals; said further acoustic wave resonator element structures being operable to interact with further acoustic waves propagating within the piezoelectric material to produce subsequent frequency responses; said first acoustic wave resonator element structure and further acoustic element structure and further acoustic wave resonator element structures being combined to form a ladder or lattice filter network to produce an overall frequency response; and sensitive areas mounted on the piezoelectric material and associated with the acoustic wave resonator element structures which, if predetermined effects to be sensed or detected are present, are modified thereby to control the nature of the frequency response and thereby provide information with respect to the predetermined effects to be sensed or detected.