公开(公告)号：US20220236484A1

公开(公告)日：2022-07-28

申请号：US17584745

申请日：2022-01-26

Applicant: Worcester Polytechnic Institute

Inventor： Yuxiang Liu ,  Pratap Rao ,  Yundong Ren ,  Mucheng Li

IPC: G02B6/12 ,  G02B6/35 ,  G02B6/42 ,  G02B6/02

Abstract: A fiber optic sensing device includes an optical fiber having a polished end defining a flat sensory portion coated with a lossy-mode-resonance (LMR) coating. A reflective coating on an end face of the optical fiber facilitates propagation of a return signal. An optic circuit for identifies a wavelength attenuated by the LMR coating from the return signal reflected by the reflective coating based on a moisture presence at the sensory portion. Various gaseous parameters may be detected based on the coating on the sensory portion. An LMR coating of tin oxide (SnO2) is employed for moisture sensing.

公开(公告)号：US11668873B2

公开(公告)日：2023-06-06

申请号：US17584745

申请日：2022-01-26

Applicant: Worcester Polytechnic Institute

Inventor： Yuxiang Liu ,  Pratap Rao ,  Yundong Ren ,  Mucheng Li

IPC: G02B6/12 ,  G02B6/02 ,  G02B6/42 ,  G02B6/35

CPC classification number: G02B6/12007 ,  G02B6/021 ,  G02B6/3512 ,  G02B6/4214

Abstract: A fiber optic sensing device includes an optical fiber having a polished end defining a flat sensory portion coated with a lossy-mode-resonance (LMR) coating. A reflective coating on an end face of the optical fiber facilitates propagation of a return signal. An optic circuit for identifies a wavelength attenuated by the LMR coating from the return signal reflected by the reflective coating based on a moisture presence at the sensory portion. Various gaseous parameters may be detected based on the coating on the sensory portion. An LMR coating of tin oxide (SnO2) is employed for moisture sensing.