CAJ | 학술논문

为了校准由八个磁通门传感器组成的传感器阵列的灵敏度，设计了一个磁传感器阵列校准系统．利用多通道数据采集卡对信号进行采集，使用快速傅里叶变换和三角积分法对数字信号分别进行了处理．结果表明，利用快速傅里叶变换，可以得到准确的、相互靠近的峰值频率，其范围介于3．8～4．2Hz之间，信号的振幅约为200nT，与理论计算值相差较大；采用三角积分法进行处理，可以获得功率谱密度，得到准确的信号振幅，与理论预测值的误差小于5％．
위료교준유팔개자통문전감기조성적전감기진렬적령민도，설계료일개자전감기진렬교준계통．이용다통도수거채집잡대신호진행채집，사용쾌속부리협변환화삼각적분법대수자신호분별진행료처리．결과표명，이용쾌속부리협변환，가이득도준학적、상호고근적봉치빈솔，기범위개우3．8～4．2Hz지간，신호적진폭약위200nT，여이론계산치상차교대；채용삼각적분법진행처리，가이획득공솔보밀도，득도준학적신호진폭，여이론예측치적오차소우5％．
A simple calibration system for a magnetic field sensor array was designed ,and experiments were carried out to calibrate the sensor array which was composed of eight fluxgate sensors . Fast Fourier Transforms and trapezoidal numerical integrations were applied to deal with the raw signals .It was found that accurate peak frequencies could be obtained by applying the fast Fourier Transforms (FFT) .The frequencies lie in between 3 .8 Hz and 4 .2 Hz and are close to each other .The amplitude of the signal obtained simultaneously is about 200 nT ,much different from the precisely computed value . Besides ,the power density spectrum was obtained by processing the signal using trapezoidal numerical integrations ,with an accurate amplitude of the signal obtained .Its error is less than 5% in comparison with the theoretical predictions .