| 摘要 |
PURPOSE:To obtain a signal consisting only of thermal electromotive force, by providing a circuit of even numbers of thermocouples connected in order to add the thermal electeomotive force so that it does not cross an induction magnetic field each other, and offsetting induced voltage generated on its output end. CONSTITUTION:Voltage induced by an outer electric field generated in a stainless steel wire 3 juxtaposed to a thermocouples 1, 2, is added by inverting a phase to output terminals A, B connected with two pairs of platinum-platinum rhodium thermocouples 1, 2 in order to add its thermal electromotive force. Hereby, a component of the induced voltage is offset and an addition output consisting only of the thermal electromotive force of the thermocouples 1, 2 is inputted into a differential amplifier 4. |
