title: Development of an optical fiber sensor for angular displacement measurements.
abstract: For diagnostic and therapeutic purposes, the joint angle measurement of a patient after an accident or a surgical operation is significant for monitoring and evaluating the recovering process. This paper proposed an optical fiber sensor for the measurement of angular displacement. The effect of beveled fiber angle on the detected light signal was investigated to find an appropriate mathematical model. Beveled fiber tips redirected the light over a range of angles away from the fiber axis. Inverse polynomial models were applied to directly obtain and display the joint angle change in real time with the Lab-VIEW program. The actual joint angle correlated well with the calculated LabVIEW output angle over the test range. The proposed optical sensor is simple, cost effective, small in size, and can evaluate the joint angle in real time. This method is expected to be useful in the field of rehabilitation and sport science.
authors.affiliation: Department of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, South Korea Department of Biomedical Engineering, Research Institute of Biomedical Engineering, Konkuk University, Chungju, South Korea.
authors.forename: Gu-In
authors.initials: GI
authors.lastname: Jung
authors.forename: Ji-Sun
authors.initials: JS
authors.lastname: Kim
authors.forename: Tae-Hee
authors.initials: TH
authors.lastname: Lee
authors.forename: Ju-Hyeon
authors.initials: JH
authors.lastname: Choi
authors.forename: Han-Byeol
authors.initials: HB
authors.lastname: Oh
authors.forename: A-Hee
authors.initials: AH
authors.lastname: Kim
authors.forename: Gwang-Moon
authors.initials: GM
authors.lastname: Eom
authors.forename: Jeong-Hwan
authors.initials: JH
authors.lastname: Lee
authors.forename: Soon-Cheol
authors.initials: SC
authors.lastname: Chung
authors.forename: Jong-Rak
authors.initials: JR
authors.lastname: Park
authors.forename: Young-Jae
authors.initials: YJ
authors.lastname: Lee
authors.forename: Hee-Jung
authors.initials: HJ
authors.lastname: Park
authors.forename: Jae-Hoon
authors.initials: JH
authors.lastname: Jun
mesh_terms: D001696:Biomechanical Phenomena; D001698:Biomedical Engineering; D004867:Equipment Design; D005336:Fiber Optic Technology; D006801:Humans; D007596:Joints / Q000502:physiology*; D008027:Light; D008422:Materials Testing; D008962:Models, Theoretical; D008991:Monitoring, Physiologic / Q000295:instrumentation*; D009068:Movement; D055100:Optical Fibers; D011108:Polymers; D011184:Postoperative Period; D012984:Software
chemical_list: D011108:Polymers
keywords: Angular sensor; Asymmetric beam profile; Beveled tip; Goniometer; Optical fiber