ENVIRONMENT DIFFERENCE DETECTOR

摘要

An object of this invention is to provide an environment difference detector which has a simple configuration, which is difficult to fail, which is low in manufacturing cost, and which can measures a desired environment difference quickly and highly accurately. The environment difference detector of the present invention comprises an elastic surface wave element equipped with a substrate (12) including a surface having an annular surface acoustic wave circulating path (12a), a surface acoustic wave exciting/receiving unit (14) exciting a surface acoustic wave along the circular path and receiving the circulated surface acoustic wave, and a sensitive film (16) disposed on the circular path to change an elastic nature in accordance with a change in an adjacent environment, a speed/intensity measuring unit (22) measuring a circulating speed and intensity of the surface acoustic wave from an electric signal generated by the unit (14) when the unit receives the circulating surface acoustic wave, and an environment evaluation unit (24) evaluating an environment adjacent to the sensitive film from at least one of the circulating speed and the intensity measured by the unit (22).