Abstract: To address issues such as hysteresis errors and complex operation in traditional magnetic field
measurement based on magnetically induced rotation angle,an improved magnetic field measurement method
based on the Faraday magneto-optical effect is proposed.This method realizes the measurement of magnetic
induction intensity by utilizing the power change of light passing through a magneto-optical crystal under the
action of a magnetic field. In the experiment,a magnetic field measurement device based on magnetically
induced optical power variation was constructed using a laser,polarizer,magneto-optical crystal,and optical
power meter.The relationship between the magnetic field and the optical power of light passing through the
magneto-optical crystal was analyzed theoretically.Additionally,measurements of the internal magnetic field of a
solenoid and error analysis were conducted.When the excitation voltages were 1.5,3.0 and 4.5 V respectively,
the measured magnetic induction intensities inside the solenoid were 0.727,1.372,and 2.068 mT.The relative
errors compared with the actual values were 2.1%,2.4% and 1.8% respectively,and the total combined
uncertainties were 0.230,0.216 and 0.161 mT respectively.Compared with other magnetic field measurement
methods based on the magneto-optical effect,this method offers the advantages of small error,simple optical
path structure,and easy operation.
钟远聪, 邱浚林 , 罗劲明, 张海宁 . 基于磁光效应的磁场测量改进与误差分析[J]. 大学物理实验, 2026, 39(2): 37-41.
ZHONG Yauncong, QIU Junlin , LUO Jinming, ZHANG Haining . Improvement and Error Analysis of Magnetic Field Measurement Based on Magneto-optical Effect#br#. Physical Experiment of College, 2026, 39(2): 37-41.