METHOD FOR REDUCING TEMPERATURE ERROR OF MEASUREMENT OF MULTICOORDINATE DISPLACEMENTS OF BLADE ENDS BY SINGLE-COIL EDDY-CURRENT TRANSDUCER

摘要

FIELD: measurement equipment.;SUBSTANCE: scope of application: reduction of temperature error at measurement of movements of electrically conducting objects under conditions of action of high temperatures. Essence: the first thermocouple is located in a single-coil eddy-current transducer in an internal wire of its coaxial current circuit attaching a sensitive element to a volumetric coil of a matching transformer. A hot junction of the thermocouple is located inside the current circuit near its end face facing to the sensitive element. The second thermocouple is located so that its hot junction turns out to be at a contact point of the current circuit with the volumetric coil of the matching transformer. Temperature considered for temperature correction at calculation of coordinate constituents is determined as ${\Theta }_{SE}={\Theta }_{TC1}+({\Theta }_{TC2}-{\Theta }_{TC1})\cdot \frac{l_1}{l_2},\mathop{\mathrm{image}}$ where Θ_TC1 - temperature in the location zone of the hot junction of the first thermocouple arranged in the internal wire of the coaxial current circuit; Θ_TC2 - temperature in the location zone of the hot junction of the second thermocouple arranged at the contact points of the current circuit with the volumetric coil of the matching transformer; l₁, l₂ - distances from the sensitive element to the hot junction of the first and the second thermocouples respectively.;EFFECT: reduction of measurement error of coordinate constituents.;2 dwg