An optical fiber-based environmental detection system and the method thereof

摘要

#$%^&*AU2014100007A420140130.pdf#####An Optical Fiber-Based Environmental Detection System and the Method Thereof ABSTRACT An optical fiber environmental detection system comprising an interferometer, a broadband light source and a detector is disclosed. The interferometer further comprises a thin core fiber, a first single mode fiber and a second single mode fiber; wherein the thin core fiber is coupled to the first and second single mode fiber via a first junction and a second junction respectively. When an emission light reaches the first junction, highorder cladding modes will be excited. The excited cladding modes will interfere with the core mode at the second junction. The interferences determine the intensity maximum or minimum of the received signal. When there is an ambient environmental change, a shift of the received signal would be induced. According to the shift, environmental change, for instance ambient temperature, could be determined. 131/9 22a 22b Broadbn Detector 20 24 6 18 Figure 1 30a 36a 28a 34a 32a 38a 34a s6a 38b 24a Figure 2