Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/2834
標題: 基於考畢子振盪器之非接觸式單線圈磁彈薄膜應變計研究
The Study of Non-contact Single Coil Strain Sensor of Magnetoelastic Thin Film Based on Colpitts Oscillator
作者: 陳柏榕
Chen, Po-Jung
關鍵字: 磁彈薄膜;Megnetoelastic hin film;單線圈;考畢子振盪器;應變感測器;Single coil;Colpitts oscillator;Strain sensor
出版社: 機械工程學系所
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摘要: 
由於應變規屬於有線式無法運用在轉軸上,而磁彈薄膜為一種非晶相薄帶,具有高導磁性以及低磁致伸縮率等特性,當磁彈薄膜發生形變時,會造成導磁率改變,導磁率發生變化則會影響線圈電感值上的改變。為改善傳統式應變規之缺點,本研究以磁彈(magnetoelastic)效應為基礎,製作非接觸式磁彈應變感測器,使用低成本且高靈敏特性之Metglas 2826MB(Fe40Ni38Mo4B18)非晶相金屬薄膜作為應變材料。
本文實驗中在可撓性鋁合金基板上黏貼非晶相磁彈薄膜材料,當施加應變於鋁合金基板時,將導致磁彈薄膜機械形變造成一個相對應的磁場變化,再使用螺線圈以非接觸式感應的方式偵測磁彈薄膜之磁場變化。螺線圈與考畢子振盪器串接,以實現單線圈同時做激磁與接收,接著由真有效值轉換器將交流訊號轉為直流電壓,最後經過低通濾波器濾除雜訊後,將觀察輸出電壓訊號與應變之相對關係。
本文針對感應線圈做了幾種參數的改變作比較,觀察線圈在不同線圈匝數、線圈直徑以及線徑大小的情況下對磁彈感測器有何影響,經實驗結果發現在線圈60匝、線徑大小0.37mm、線圈直徑20mm的情況下電壓差變化最大,其靈敏度最高為413.22×10-4V/με,訊雜比為30.22;而線徑越大除了可以增加靈敏度,同時可以有效改善雜訊問題。

The magnetoelastic thin film is one kind of amorphous ribbons, it has high permeability and low magnetostriction. When the strain was applied on the film, the permeability changed. This paper is based on the magnetoelastic effect to fabricate a contactless magnetoelastic strain sensor, where a Metglas 2826MB (Fe40Ni38Mo4B18) amorphous ribbon is used for their low cost and high sensitivity. The ribbon was attached to an aluminum alloy thin board. When the stress was applied on aluminum alloy thin board, the magnetic field changed due to the mechanical deformation of magnetoelastic thin film, and the further induced the change in the magnetic flux, which was detected by a contactless sensor of detection coil. The spiral coil and the Colpitts oscillator is connected in series to achieve single coil and to excite and receive at the same time. Then through the RMS converter to the AC signal into the DC voltage. Finally, after the low-pass filter to filter out noise, will observe the relations of output voltage and strain.
In this paper, the induction coil changes in several parameters for comparison, to observe the coil at different coil turns, coil diameter and the wire diameter size of the impact of the magnetoelastic strain sensors. The experimental results showed the differential change in voltage of 60 turns and the coil diameter at 20mm is maximum, the sensitivity is 413.22×10-4V/με, Signal-to-noise ratio is 30.22; While the wire diameter of the greater can increase the sensitivity, it also improve the noise problem effectively.
URI: http://hdl.handle.net/11455/2834
其他識別: U0005-2508201200061100
Appears in Collections:機械工程學系所

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