Abstract
The modulated coupled infrared light is injected into the liquid drop by a source fiber positioned in the drop head and is collected by a detector fiber on the opposite side after various reflection, refraction and absorption of the optical signal inside the drop. Capacitive drop sensor uses the drop head as one of its plate and a cylindrical ring plate, which surrounds the drop head and the space occupied by the formed drop, as another. Based on the capacitance changes, the instant drop volume can be obtained during its growth. Fiber-capacitive drop sensor will be introduced concretely in this paper, including its working principle, mathematical model, and the structure design of drop head.
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