磁通门磁强计的一种计算法

A Method of Calculating Flux-gate Magnetometer

本文给出了采用方波激励的磁通门磁强计的一种计算方法。重点讨论了方波电压作用下环形铁芯电路的求解方法。此外,文章还从恒流源激励出发,利用图解分析,推导了偶次谐波磁通表达式。结果表明,信号磁场H_0使调制输出电压的峰值在一个方向上增加,而在另一方向上减少,因而为峰差解调器的应用提供了依据。

A method of calculating flux-gate magnetometer excited by a squ-are-wave generator is presented in this paper. It's well known that the main dif-ficulty in calculation is that of non-sinusoidal and non-linear iron-core circuits. Sothat, the emphasis of this paper is to discuss the solving process of this kind ofcircuit with ring-core, to which a squarewave voltage is supplied. Owing to a qui-te high resistor inserted in the excitation circuit, the magnetic modulator is exci-ted by square-wave voltage in form, but actually it's excited by pulse current.Moreover, from the condition of constant current source, the expressions of evenharmonic flux has been derived by means of even illustrated analysis. The resultshows the peak value of output voltage modulated by the signal field H_0, increasesin one direction with H_0, but decreases in the opposite direction. Therefore, it pro-vides the basis for the use of peak-difference demodulator.