The influence of the liquids with various values of conductivity, permittivity, and viscosity on characteristics of slot mode in the structure consisting of delay line with shear – horizontal plate wave and upper plate separated by air gap was experimentally studied. Delay line and upper plate were made of Y-X lithium niobate and Z-X lithium niobate, respectively. The excitation of the slot mode leaded to the appearance of the sharp resonant peaks on the frequency dependencies of insertion loss and phase of output signal of delay line. It has been found that the depth and frequency of these peaks depend on pointed properties of liquid contacting with upper plate. The possibility of the identification of liquids with various values of conductivity, permittivity, and viscosity has been demonstrated.
$^1$Kotel’nikov Institute of Radio Engineering and Electronics of RAS, Saratov Branch
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