Development Of Magnetostrictive Sensor Based On Weak Strain Measurement

Various materials with magnetostrictive properties can convert various forms of energy such as electromagnetic energy,mechanical energy and acoustic energy,so the magnetostrictive material becomes a kind of mutual conversion between information and energy.Important special materials.Magnetostrictive materials can be promoted and applied in various high-tech fields such as transducer technology development,intelligent wing manufacturing,robot development and micro-displacement actuation machines,which can enhance national competitiveness in the 21st century.Strategic special function materials.In order to solve the problem of excessive error,excessive volume,complicated operation and high price in the traditional magnetostrictive test instrument,this paper has done the following theoretical analysis and research on the theory and sensor production:（1）The existing method of measuring the magnetostrictive coefficient is analyzed.Based on the traditional formula of magnetostrictive coefficient,combined with the strain gauge method,the whole substitution method and the Huygens bridge method,A new method of measuring the magnetostrictive coefficient by the unbalanced bridge method can obtain the magnetostrictive coefficient accurately and accurately.At the same time,the accuracy of the traditional large magnetostrictive testing instrument can be achieved.Compared with some traditional large magnetostrictive tests The balanced bridge method used by the instrument is more stable and quick and easy;（2）On the basis of the above method,a sensor which can be used for accurate measurement of weak strain is successfully designed and manufactured by combining the amplifier,ARM single chip,regulator module,shielded wire,power supply and semiconductor strain gauge.The signal processing device can The measured analog quantity is converted into digital quantity,and the control,power supply,display,enlargement and measurement module are designed.At the same time,the design reset,measurement,data table display,clear screen,display word,display letter data system and curve drawing And then the program in the use of related procedures to deal with the algorithm,the sensor can achieve continuous measurement,synchronous real-time measurement and non-destructive measurement of magnetostrictive material corresponding to the magnetostriction coefficient,weak change measurement accuracy can reach 10^-6m,to The accuracy of the optical interferometric device measurement;（3）The relationship between the magnetostrictive coefficient and the magnetic field was established by using the above-mentioned sensor.The relationship between the magnetostrictive coefficient and the magnetic field was established.At the experimental results,we can see that the Fe-Ga sensor can be very stable and accurate measurement of the magnetostrictive coefficient,while the balance with the bridge method of measurement results were compared,data analysis and drawing results show that the sensor is still more stable measurement results.