磁歪式張力センサの特性に及ぼす熱サイクルの影響

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  • Thermal Cycling Affecting the Output Voltage of a Magnetostrictive Tension Sensor.
  • ジワイシキ チョウリョク センサ ノ トクセイ ニ オヨボス ネツ サイクル ノ エイキョウ

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The tension sensor is expected for tension monitoring or control in varies fields. For the tension monitoring of the Shinkansen contact line, we are developing a new tension sensor using magnetostrictive film. The sputtering technique was used to prepare 90wt%Ni-Fe magnetostrictive film on stainless-steel shafts. Thermal cycling affecting the output characteristics of the tension sensors are studied as functions of the thickness or the intrinsic stress of Ni-Fe film. The optimal value of the thickness in Ni-Fe films was found to realize a minimum thermal drift of tension sensor. The intrinsic stress in Ni-Fe films decreases with increasing the sputtering target voltage. The sensor output change by the thermal cycling test decreases with decreasing the intrinsic stress. The output change in the sensor with 90wt% Ni-Fe film prepared by -525V(sputtering target voltage) is less than ±0.2% F.S.(full scale)in the 1650 cycles durability test with 258-318K temperature. The sensor detects 12-18kN tension for the Shinkansen contact line with an accuracy of ±2% F.S. in the temperature range 258-318K.

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