Мониторинг контактного сопротивления электродов с контролируемым образцом при термоэлектрическом контроле
Авторы
DOI:
https://doi.org/10.31489/2024No2/38-48Ключевые слова:
термоЭДС, горячий электрод, холодный электрод, контактное сопротивление, генератор тока, фильтр, измерительный резисторАннотация
В статье проведен анализ влияния контактного сопротивления электродов на результат контроля. Показано, что при увеличении величины измерительного резистора увеличивается допустимое значение контактного сопротивления электродов с испытуемым образцом. Предложен косвенный способ контроля контактного сопротивления, заключающийся в пропускании стабильного тока высокой частоты через контактное сопротивление и измерения напряжения на этом сопротивлении. Построена зависимость относительного напряжения на измерительном резисторе от суммарного сопротивления контакта. Рассчитано допустимое значение контактного сопротивления, при котором измеряемое значение термоЭДС будет отличается от истинного не более чем на 10 %. Предложенный способ позволяет проводить измерение контактного сопротивления непосредственно в процессе контроля термоЭДС.
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