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激光多普勒準靜態法測量磁致伸縮系數

Magnetostriction quasi-static measurements with laser Doppler effect

  • 摘要: 提出了一種利用激光多普勒測量磁致伸縮系數的方法,理論分析了激光多普勒測量磁致伸縮系數的工作原理,設計了鐵鎵合金棒材的測試系統.對鐵鎵合金棒(Galfenol)的準靜態磁致伸縮系數進行測量.結果顯示,該方法所獲得應變與出廠數據符合較好,在10 Hz驅動電流下獲得鐵鎵合金棒的動態變化曲線.該測量方法具有以下優勢:(1)能夠實現非接觸測量;(2)可以測量鐵鎵合金棒端面任意點的應變情況;(3)測量結果準確度較高;(4)測量操作簡單.

     

    Abstract: A quasi-static method for measuring the magnetostrictive coefficient of Fe-Ga alloys by using laser Doppler effect was put forward, and its working principle was also analyzed. The quasi-static magnetostrictive coefficient of Galfenol was measured. The results show that strains obtained from the measuring setup are consistent with factory data, and the dynamie characteristics curve of Galfenol driven by 10 Hz current is obtained. This method has the following advantages:(1) noncontact measurement can be implemented, (2) the strain of magnetostrietion in any point of the rod surface can be measured, (3) the accuracy is better, and (4) little operator skill is required.

     

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