Patent Number: 6,293,136

Title: Multiple mode operated surface acoustic wave sensor for temperature compensation

Abstract: A surface acoustic wave device sensor configured so as to have at least two different modes of operation. An acoustic response is obtained from each of the different modes of operation. The different modes of operation are a combination of a temperature effect and a measurand effect. The measurand effect is caused by the absorption and/or adsorption of a substance into a selective coating on the piezoelectric substrate. The two different modes of operation are effected differently by the temperature effect and therefore can be used to effectively eliminate the temperature effect by simultaneously solving equations representative of the different modes of operation. The present invention eliminates the need to provide other relatively more complicated temperature compensating structure or to maintain the device at a predetermined constant temperature. The present invention can be used to detect different chemicals or substances.

Inventors: Kim; Yoonkee (Freehold, NJ)

Assignee: The United States of America as represented by the Secretary of the Army

International Classification: G01N 29/02 (20060101); G01N 29/22 (20060101); G01N 29/32 (20060101); G01N 29/30 (20060101); G01N 029/02 (); G01N 029/24 ()

Expiration Date: 09/25/2018