公开(公告)号：US20220236484A1

公开(公告)日：2022-07-28

申请号：US17584745

申请日：2022-01-26

申请人： Worcester Polytechnic Institute

发明人： Yuxiang Liu ,  Pratap Rao ,  Yundong Ren ,  Mucheng Li

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

摘要： 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：US12055381B2

公开(公告)日：2024-08-06

申请号：US17669042

申请日：2022-02-10

申请人： Worcester Polytechnic Institute

发明人： Yuxiang Liu ,  Hamed Jafarishad ,  Mucheng Li

IPC分类号： G01B11/16

CPC分类号： G01B11/16

摘要： A strain gauge device employs a reflective base adapted to reflect a divergent optical signal, and a glass tube attached to the reflective base for optical communication therewith, the glass tube having a working length into which an optical fiber is inserted. The optical fiber is configured for transporting an optic signal indicative of the detected strain. The optic fiber has an outside diameter slightly smaller than an inside diameter of the glass tube for providing a slight tolerance. A distal end is disposed in slidable communication with an interior of the glass tube and accommodated by the tolerance, and a sensing circuit at the proximate end receives an optical signal indicative of strain or displacement. A resilient buffer layer made of soft silicone is disposed outside the glass tube to allow for large deformation measurements and reduce the distortion of the deformation by the introduction of the sensor.

公开(公告)号：US11668873B2

公开(公告)日：2023-06-06

申请号：US17584745

申请日：2022-01-26

申请人： Worcester Polytechnic Institute

发明人： Yuxiang Liu ,  Pratap Rao ,  Yundong Ren ,  Mucheng Li

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

CPC分类号： G02B6/12007 ,  G02B6/021 ,  G02B6/3512 ,  G02B6/4214

摘要： 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：US20220252388A1

公开(公告)日：2022-08-11

申请号：US17669042

申请日：2022-02-10

申请人： Worcester Polytechnic Institute

发明人： Yuxiang Liu ,  Hamed Jafarishad ,  Mucheng Li

IPC分类号： G01B11/16

摘要： A strain gauge device employs a reflective base adapted to reflect a divergent optical signal, and a glass tube attached to the reflective base for optical communication therewith, the glass tube having a working length into which an optical fiber is inserted. The optical fiber is configured for transporting an optic signal indicative of the detected strain. The optic fiber has an outside diameter slightly smaller than an inside diameter of the glass tube for providing a slight tolerance. A distal end is disposed in slidable communication with an interior of the glass tube and accommodated by the tolerance, and a sensing circuit at the proximate end receives an optical signal indicative of strain or displacement. A resilient buffer layer made of soft silicone is disposed outside the glass tube to allow for large deformation measurements and reduce the distortion of the deformation by the introduction of the sensor.