There are four kinds of products:powered,granular,nubbly and over-slender,which are widely used in the field of rubber,pesticide,paint,fodder,vinylite,adhesive and so on.

粉、造粒、、超细产品，广泛应于橡胶、农药、涂、饲、塑、合成树脂、胶粘剂等行业。

A new kind of ferromagnetic collector type fiber-optic current sensor which combines a nubbly magneto-optic material with a ferromagnetic concentrator ring is designed in this paper.

设计了一种应磁光材与集磁环相结合的集磁式光纤电流传感器。