FIELD: instrumentation.
SUBSTANCE: proposed device comprises two sensitive elements composed by hollow waveguides arranged along the pipeline, on its outer side. Every said waveguide shares resilient end wall with said pipeline. Every waveguide is connected with appropriate electronic unit. Sensitive element data parameter comparator has two inputs connected to outputs of said electronic units and out connected with indicator. Note here that every waveguide incorporates electromagnetic oscillation exciter and electromagnetic oscillation pickup arranged on one end of waveguide. Note also that excited electromagnetic wave frequency is fixed and set lower than lower-order electromagnetic wave excitation frequency.
EFFECT: simplified design.
1 dwg
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