Browsing by Author "Lin, Chen-Hsuan"

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Design and fabrication of a cascaded electro-thermal bimorph actuator
(2005)
Lin, Chen-Hsuan
;
Yeh, Cheng-Chi
;
Hsu, Chen-Peng
;
Hsu, Wensyang
;
機械工程學系
Here a cascaded bimorph actuator is proposed by integrating several novel actuation units to accumulate the vertical displacements. Each actuation unit comprises two types of bimorph beams and a constraint bar, and both beams will stretch outward with respect to the constraint bar while heating. In comparison with other three conventional bimorph actuator designs at the same device size, it is shown that the proposed design can provide larger vertical displacement. The proposed cascaded bimorph actuator is fabricated by surface micromachining technique and released by XeF2 silicon isotropic etching. Whole suspended structure consisting of the polysilicon and the aluminum is around 510 x 400 mu m(2) with four actuation units. The resistance is about 650 Q. In testing, the fabricated device is shown to provide reversible vertical displacement of 22.5 mu m at 4.5 V, and the operating temperature is measured by an infrared thermal microscope (InfraScope II, QFI). The calibrated maximum temperatures are compared with simulated results by ANSYS 6.0 in good agreement. It is found that the maximum temperature is 147 degrees C when the input voltage is 4.5 dc volts, and the maximum temperature is below 400 degrees C even at 10 V. However, it is found that the residual stress in the suspended structure will affect the vertical displacement of the device.
The Methodology in the Accuracy Improvement of the Flexible Current Sensing Coil Tag for Household Two-Wire Power Lines
(2015-10-01)
Lin, Chen-Hsuan
;
Cheng, Yu-Ting
;
Chen, Yung-Chang
;
Fu, Yu-Min
;
Hsu, Wei-Hung
The paper presents the methodology including the deployment of a structure comprising of C-clamp magnetic stripes and a self-calibration scheme using a four-coil design to resolve the issues of the interference and misplacement problems existing in the flexible nonintrusive current sensor tag for the current detection of household two-wire power lines. Experimental results show that the stripe structure can effectively screen out the magnetic flux originating from the nearby power line for the reduction of sensing error caused by the electromagnetic field interference and the calibration scheme containing the correction of horizontal misplacement and the analysis of power cable thickness via the four-coil design can provide the information of sensor location for accurate current sensing. Less than 4% of sensing error indicates that the proposed methodology can indeed facilitate the flexible current sensor tag for practical use.