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、、超类产品，广泛应用于橡胶、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.

设计了一种应用光材与集环相结合的集式光纤电流传感器。