| 摘要 |
PROBLEM TO BE SOLVED: To surely and correctly measure a viscosity and the like of a liquid by setting a cover for liquid-tightly covering input/output electrodes and a conductive member thereby forming a space to the input/output electrodes and the conductive member in a surface acoustic wave apparatus for measuring characteristic values of the liquid. SOLUTION: The surface acoustic wave apparatus 40 is composed of a surface acoustic wave device 42 set on a base 41 and having the combed input electrode 44 and the combed output electrode 45 arranged in parallel along a propagation direction of surface acoustic waves on a piezoelectric substrate 43, and a plurality of metallic wires 49a, 49b, 49c and 49d led out from the input electrode 44 and the output electrode 45 respectively. Covers 50a and 50b are set to an upper face of the base, which liquid-tightly cover the input electrode 44, the output electrode 45 and the wires 49a, 49b, 49c and 49d while leaving a sensing face 43a between the input electrode 44 and the output electrode 45, thereby forming spaces S to the electrodes and the wires. |
