A small sensitive magnetometer
A small sensitive magnetometer
复制标题
小型灵敏磁力计
DOI：
10.1049/pi-2.1953.0152
复制
发表时间：
1953
期刊：
影响因子：
--
通讯作者：
T. Palmer
中科院分区：
文献类型：
--
作者：
T. Palmer
本文描述了一种磁力计，它主要是为测量磁导磁体有限空间内的磁场而设计的。仪器的测量头包含一个薄螺线管，直流电流通过该螺线管，以平衡被测量的场并在螺线管中产生零场。螺线管内的灵敏场检测器由携带频率为5 kc/s的交流电的细铁磁（Mumetal）线组成。该电流在导线中产生饱和的圆形磁场，并导致其有效纵向磁导率以两倍于电流频率的频率交替。因此，沿着导线的磁场沿着在导线中产生交变感应，从而产生交变电动势。在螺线管中;这个电动势。因此可以作为场的敏感指示。使用专门为磁力计设计的相关设备，可以检测到2 × 10 - 5奥斯特的场强变化。或者，该探头可以与标准实验室设备一起使用，允许检测2 × 10−3奥斯特的磁场。通过平衡电流在螺线管中产生的热量，可以测量的最大场强被限制在约50奥斯特。
A magnetometer is described which was designed primarily for measuring a magnetic field within the confined space of a permeameter. The measuring head of the instrument contains a thin solenoid through which a direct current is passed, to balance the field being measured and produce zero field in the solenoid. A sensitive field detector within the solenoid consists of a fine ferromagnetic (Mumetal) wire carrying an alternating current of frequency 5 kc/s. This current develops a saturating circular field in the wire and causes its effective longitudinal permeability to alternate at twice the frequency of the current. A field along the wire thus produces an alternating induction in the wire and consequently an alternating e.m.f. in the solenoid; this e.m.f. therefore serves as a sensitive indication of field.With associated equipment designed especially for the magnetometer it is possible to detect a change in field strength of 2 × 10−5 oersted. Alternatively the head can be used with standard laboratory equipment allowing a field of 2 × 10−3 oersted to be detected. The maximum field strength that can be measured is limited to about 50 oersteds by the heat developed in the solenoid by the balancing current.