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Surface acoustic wave (SAW) sensors, which are sensitive to a variety of surface changes, have been widely used for chemical and physical sensing. The ability t o control or compensate for the many surface forces has been instrumental in collecting valid data. In cascs in which it is not possible t o neglect certain effects, such as frequency drift with temperature, methods such as the "dual sensor" technique have been utilized. This paper describes a novel use of a dual sensor technique, usingdoi:10.1109/58.896138 fatcat:l5smwyo7n5db3cbufo3xlnc5t4