2013
DOI: 10.5370/kiee.2013.62.7.1009
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Fiber-optic Goniometer to Measure Knee Joint Angle for the Diagnosis of Gait Disturbance

Abstract: In this study, we developed a fiber-optic goniometer for the continuous measurement of knee joint angle which provides important medical information on Alzheimer's disease. The fiber-optic goniometer is composed of a light-emitting diode (LED), a plastic optical fiber (POF), and a voltage output photodiode (PD). As a sensing part of the fiber-optic goniometer, a unclad fiber with regular intervals of 1 mm was fabricated to improve efficiency of bending loss according to the angle variation of knee joint. The e… Show more

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Cited by 6 publications
(4 citation statements)
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“…The joint angle measurement using electrogoniometer, however, has a drawback of lowering the level of accuracy due to the abrasion of internal resistance caused by repeated use [2][3]. To counter such problems, the study was conducted using attachable sensors such as fiber-optic angle sensor, optical fiber sensor, and internal measurement unit (IMU) to measure the joint angles [4][5][6][7]. Attachable sensors increase the accuracy of the joint angle measurement data by attaching the sensor to the body but it lacks convenience [8][9].…”
Section: Introductionmentioning
confidence: 99%
“…The joint angle measurement using electrogoniometer, however, has a drawback of lowering the level of accuracy due to the abrasion of internal resistance caused by repeated use [2][3]. To counter such problems, the study was conducted using attachable sensors such as fiber-optic angle sensor, optical fiber sensor, and internal measurement unit (IMU) to measure the joint angles [4][5][6][7]. Attachable sensors increase the accuracy of the joint angle measurement data by attaching the sensor to the body but it lacks convenience [8][9].…”
Section: Introductionmentioning
confidence: 99%
“…When curvature is applied to the optical fiber, the angle of incidence becomes smaller, as shown in Figure 2. Accordingly, through this principle, light loss due to refraction occurs in light rays whose incidence angle is smaller than the critical angle, which is expressed in Equation (1).…”
Section: Bending Loss Of Pofmentioning
confidence: 99%
“…Angle measurement is used in a variety of industries, from the traditional mechanical industry to clinical and motion capture, and related research is actively underway [1][2][3][4]. In particular, various robot systems including biomimetics, the use of which has recently been rapidly increasing, are composed of many joint structures, and the joint structures necessarily involve angle adjustment.…”
Section: Introductionmentioning
confidence: 99%
“…2 In particular, measurements of knee joint angles, which are related to gait, can be effectively used for the early diagnosis of various diseases like brain lesions such as Alzheimer's disease and Lou Gehrig's disease. 3,4 Hwang et al developed an active foot joint orthosis, which could control dorsi/ plantar flexion of ankle joints and classify gait movements in order to provide the assisting force at a suitable moment for appropriate gait exercises, and also a long-leg orthosis for knee joint control. 5,6 Ferris proposed a powered foot joint orthosis that generated plantar flexion torques at a suitable time by sending active control command signals from a foot switch installed on the sole and classifying gait movements into phases.…”
Section: Introductionmentioning
confidence: 99%