Through analysis on existing magnetostriction coefficient measurement method

a method of nonbalanced electric bridge is proposed to determinatie magnetostrictive coefficient

and in accordance with the method

design weak strain measurement sensor.Using it obtain relationship curve of the Fe-Ga alloy material in a magnetic field of 0

60 m T when it is at the temperature of 295 K

and establish a relation formula of magnetostriction coefficient and magnetic field. The experimental results show that the sensor can stably and precisely acquire the magnetostriction coefficient

for precisely measuring the changes characteristics of the magnetostrictive material in the magnetic field open up new avenues

while to some extent

the works solves the problem that a weak signal in the cu

rrent study of laboratory instruments is extremely difficult to measure and stability

and provides an example for afterward study of the related instrument and it can be promot ed further.