Study On Measurement Technology Of Magnetically Controlled Shape Memory Alloy

Magnetically controlled shape memory alloy (MSMA) is a kind of new magnetically material which was found in the 1990s. It's Martensitic transformation temperature is often lower than Curie transition temperature. It is a unique martensite phase transition material that has both ferromagnetism and thermo-elastic property in the Heusler alloys. The advantages of MSMA are not only large strain, quick response, high thrust, but also the feature of shape memory. MSMA is of a bright future of its applications in military, precision control and smart sensors and actuators.The external characteristics detection of MSMA is the basis of application. However, the research on the external characteristics is still in the stage of beginning. In order to built a base for the application of MSMA material, it is necessary to study the detection technique and testing method of MSMA external characteristics much deeper, from that, we could find out the impact and strain effect of temperature, force and magnetic field on external characteristics, and observe the strain behavior of the material in multi-environment .An external characteristic detection equipment of MSMA is designed and manufactured successfully to realize the intention mentioned above. Based on MSMA's multi-sensitivity, the experimental equipment of 4-channel-measurement is designed. It is not only able to finish the high precision and independent detection of temperature, displacement, magnetic induction intension and force, but also finish the interdependency detection of multi-parameter. The structural design is of four independent output terminals, it helps to compose to be a signal acquisition and analysis system with other equipments. The seamless technique is introduced in the dynamic detection. LabVIEW SignalExpress? TE is used to increase of experiment efficiency, and it achieves the combination software and hardware in data processing .The large number of experimental results show that MSMA Twin variants are very sensitive to the field, and under certain conditions, reversible changes . so rich phase transition behavior have MSMA materials, that can be not only used as sensors and actuators design, but also designed as intelligent detection system such as self-sensing actuator (SSA) based on its interdependency and anti-characteristic. Combining the theoretical analysis and experimental study results, it proves that, definitely, MSMA has the value for both science research and application.