【摘要】 质子旋进式磁力仪系利用核磁共振原理测量地磁场的仪器。这种仪器配置两套亥姆霍兹线圈后,不仅可以测量地磁场的总强度,而且还可以测量水平和垂直分量。仪器的最高灵敏度为0.1γ,测量范围:20000～65000γ,地磁场总强度的测量精度优于0.3γ,水平和垂直分量优于1γ。本文扼要地叙述了仪器的基本原理,设计要求,关键部件的特色,台站实验结果。我们提出了闭合误差的概念,作为仪器测量精度的判据,测量仪器的瞬时均方差,以表征测量的重复性和可靠性。更多还原

【Abstract】 The proton precession magnetometer is a geomagnetic field mea-suring device based on the principle of NMR. The instrument has already beenused widely in aeromagnetic survey and marine magnetic prospecting. When theinstrument is provided with two Helmholtz’ coils it is able to measure the hori-zontal and vertical components of the geomagnetic field as well as its total inten-sity. The instrument has a max. sensitivity of 0.1 gamma over a range of 20000 to65000 gammas of the magnetic field. Total instensity measuring accuracy is be-tter than 0.3 gamma, and the horizontal or vertical component measuring accuracyis no less than 1 gamma. This paper outlined the basic principle of the instrument,described the design requests and the distinguishing features of the critical ass-embly and presented the results of station tests. We suggest "error of closure" asa criterion of measuring accuracy and use transient root-mean-square error to ex-press repeatability and reliability of measurement of the instrument.更多还原