Human Joint Angle Estimation with Multiple-strip E-textile Stretching Sensor

Abstract

There have been many studies on strain-resistance or piezoresistance e-textile sensors. However, the important and critical factor, i.e., the elongation capability of the sensor against the actual stretching of the skin, has not been addressed yet. In this study, we propose a human joint angle estimation method with e-textile strain-resistance sensors. The stretching of the skin, on which the sensor is attached, is visually analyzed in terms of the stretching capability of the sensor and the actual stretching length of the skin. The overall system platform used to obtain and process the sensor data is described. The proposed system is implemented and applied to the elbow joint of a healthy subject. It was found that the sensors should be attached to the skin properly, especially when the skin is not stretched. It is necessary to consider the stretching capability of the sensor to accommodate the actual stretching of the skin. The two sensors attached on the lateral and medial sides provide complementary information, which can be utilized in a sensor fusion context.

Natural Hand Gesture Recognition with an Electronic Textile Goniometer

“…The sensors we fabricated did not elongate enough to comply with the joint flexion. (10) Hence, we attached one side of the sensor to the garment using a rubber band.…”

“…Gesture recognition allows to distinguish specific user motions that intend to convey messages and can be used in a myriad of applications such as human-computer interface (HCI), (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11) medicine applications including rehabilitation, (12)(13)(14) and personal identification. (15) Gesture recognition mainly consists of segmenting the acquired signals corresponding to gestures and extracting features that allow gesture classification.…”

“…(7) Electronic textiles (e-textiles) that can be embedded in clothing are being increasingly applied for gesture recognition. (9)(10)(11)(12)(13)(14)(15) The electrical properties (e.g., resistance) of flexible e-textiles enable gesture recognition given their variation with bending, stretching, and shape. Moreover, e-textiles provide greater wearing comfort and flexibility than sensors implemented on solid electronics.…”

Simple Effective and Robust Weight Sensor for Measuring Moisture Content in Food Drying Process

“…In other words, all communication systems need sensing signals with a high signal-to-noise (S/N) ratio. (26)(27)(28) This can be achieved by implementing filters in the system. In this work, we use a low-pass filter (LPF) and a Kalman filter (KF) for filtering unwanted noises generated by the thermal dynamics of the drying system owing to the placement of the weight sensors inside the oven cabinet.…”