RU2012133371A

RU2012133371A - METHOD FOR REDUCING THE TEMPERATURE ERROR OF MEASURING MULTI-ORDERED DISPLACEMENTS OF SHOVELS OF SHOVELS WITH A SINGLE-TURNED VORTEX REDUCER

Info

Publication number: RU2012133371A
Application number: RU2012133371/28A
Authority: RU
Inventors: Лев Борисович Беленький; Сергей Юрьевич Боровик; Марина Михайловна Кутейникова; Юрий Николаевич Секисов; Олег Петрович Скобелев
Priority date: 2012-08-03
Filing date: 2012-08-03
Publication date: 2014-02-10
Also published as: RU2519844C2

Abstract

Способ уменьшения влияния температуры, при котором в одновитковом вихретоковом преобразователе во внутреннем проводнике его коаксиального токовода, соединяющего чувствительный элемент с объемным витком согласующего трансформатора, располагают термопару, горячий спай которой находится внутри токовода у его торца, обращенного к чувствительному элементу, экспериментально определяют семейства градуировочных характеристик во всем диапазоне температур, а также измеряют термопарой текущие значения температуры и по значениям выходных сигналов преобразователей на основе семейств градуировочных характеристик вычисляют координатные составляющие смещения торцов лопаток относительно чувствительных элементов, дополнительно располагают вторую термопару так, что ее горячий спай оказывается в месте контакта токовода с объемным витком согласующего трансформатора, а температура чувствительного элемента, учитываемая при вычислении координатных составляющих определяется как, где Θ- температура в области расположения горячего спая первой термопары, размещенной во внутреннем проводнике коаксиального токовода; Θ- температура в области расположения горячего спая второй термопары, размещенной в месте контакта токовода с объемным витком согласующего трансформатора; l, l- расстояния от чувствительного элемента до горячего спая первой и второй термопары соответственно.A method for reducing the influence of temperature at which a thermocouple is located in a single-turn eddy current transducer in the inner conductor of its coaxial current lead connecting the sensing element to the volume coil of the matching transformer, the hot junction of which is located inside the current lead at its end facing the sensitive element, experimentally determine the family of calibration characteristics over the entire temperature range, as well as measure the current temperature values using a thermocouple Using the calibration characteristics, the coordinate components of the displacement of the ends of the blades relative to the sensitive elements are calculated, an additional thermocouple is placed so that its hot junction is at the point of contact of the current lead with the volume coil of the matching transformer, and the temperature of the sensitive element taken into account when calculating the coordinate components is determined as , where Θ is the temperature in the region of the hot junction of the first thermocouple located inside it tokovoda coaxial conductor; Θ - temperature in the region of the hot junction of the second thermocouple located at the point of contact of the current lead with the volume coil of the matching transformer; l, l are the distances from the sensor to the hot junction of the first and second thermocouples, respectively.

Claims

A method for reducing the influence of temperature at which a thermocouple is located in a single-turn eddy current transducer in the inner conductor of its coaxial current lead connecting the sensing element to the volume coil of the matching transformer, the hot junction of which is located inside the current lead at its end facing the sensitive element, experimentally determine the family of calibration characteristics over the entire temperature range, as well as measure the current temperature values using a thermocouple Using the calibration characteristics, the coordinate components of the displacement of the ends of the blades relative to the sensitive elements are calculated, an additional thermocouple is placed so that its hot junction is at the point of contact of the current lead with the volume coil of the matching transformer, and the temperature of the sensitive element taken into account when calculating the coordinate components is determined as

Θ_{H E} = Θ_{T P one} + (Θ_{T P 2} - Θ_{T P one}) \cdot \frac{l_{one}}{l_{2}}

where Θ _TP1 is the temperature in the region of the hot junction of the first thermocouple located in the inner conductor of the coaxial current lead; Θ _TP2 — temperature in the region of the hot junction of the second thermocouple located at the point of contact of the current lead with the volume coil of the matching transformer; l ₁ , l ₂ are the distances from the sensing element to the hot junction of the first and second thermocouples, respectively.