Abstract
Processes occurring in the setup for contactless measurement of conductivity of liquids have been considered. The experimental study of the relationship of the oscillating circuit Q-factor as a function of the specific resistance of liquid was performed using the electrode and electrodeless methods of measurements. Frequency relationships of additional attenuation d in the oscillating circuit caused by the presence of liquid with specific resistance ρ in inductively coupled capillary solenoid were investigated in the frequency range 2.2–8.8 MHz. It was shown that the impact of skin effect was significant for the considered values of ρ and the additional attenuation was described by formula d = – a 0 ( f ) + a 1 ( f )ρ –1/2 , where function a 1 ( f ) is proportional to f 3/2 , while function a 0 ( f ) is proportional to f 2 . Owing to different frequency dependences of functions a 1 ( f ) and a 0 ( f ), the frequency relationship of the relative depth of skin layer in liquid electrolyte was obtained in explicit form: h / r cp = A ( f )ρ 1/2 = af 1/2 ρ 1/2 , where a is the constant that does not depend on frequency and specific resistance of liquid.
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