Study of a sensor based on the series of micro-rings with dual coupling points

Abstract

A novel type of humidity sensor based on the series of micro-rings with the same radius is proposed, and the humidity is measured by detecting the spectrum drift. Experimental results show the sensitivity can achieve about 16pm/10%RH and the sensing range of the humidity sensor is 10~60%RH. The proposed structure will provide an effective way for integrated humidity sensors with simple structure, high sensitivity and low cost.