研究目的
To build a measurement system for the magnetostrictive strain of giant magnetostriction material that is non-contact, overall, and accurate.
研究成果
A laser-based magnetostriction measurement system has been developed, offering advantages of non-contact, entirety, and repeatability over traditional strain gauge methods. It can measure sample lengths of 5mm-60mm with a relative standard deviation of less than 1.0% for ten measurements.
研究不足
The system error is within 3×10-6, which is smaller than 0.5% for giant magnetostriction material. The relative standard deviation for ten times measurements is less than 1.0%.
1：Experimental Design and Method Selection:
The system is based on the laser displacement method, including dual laser devices, an electromagnet, and a control unit. It is designed for non-contact, overall, and accurate measurement.
2：Sample Selection and Data Sources:
Terbium-dysprosium-iron (Terfenol-D) samples are measured under a magnetic field generated by an electromagnet.
3：List of Experimental Equipment and Materials:
Dual laser devices, electromagnet, control unit, Hall probe connected to a gaussmeter, optical receivers, double-channel acquisition card, and a computer.
4：Experimental Procedures and Operational Workflow:
The magnetic field is generated by the electromagnet, and the magnetostrictive strain is measured using the laser displacement method. The differential measurement mode is used to eliminate errors.
5：Data Analysis Methods:
The magnetostrictive strain is calculated using the variations of the sample length measured by two measuring reflectors.
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