• Title/Summary/Keyword: Fabric Sensor

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Development and Assessment of Conductive Fabric Sensor for Evaluating Knee Movement using Bio-impedance Measurement Method (슬관절 운동 평가를 위한 생체 임피던스 측정용 전도성 섬유센서 개발 및 평가)

  • Lee, Byung-Woo;Lee, Chung-Keun;Cho, Ha-Kyung;Lee, Myoung-Ho
    • Journal of Biomedical Engineering Research
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    • v.32 no.1
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    • pp.37-44
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    • 2011
  • This paper describes the development and assessment of conductive fabric sensor for evaluating knee movement using bio-impedance measurement method. The proposed strip-typed conductive fabric sensor is compared with a dot-typed Ag/AgCl electrode for evaluating validity under knee movement condition. Subjects are composed of ten males($26.6{\pm}2.591$) who have not had problems on their knee. The strip-typed conductive fabric sensor is analyzed by correlation and reliability between a dot-typed Ag/AgCl electrode and the strip-typed conductive fabric sensor. The difference of bio-impedance between a dot-typed Ag/AgCl electrode and the strip-typed conductive fabric sensor averages $7.067{\pm}13.987\;{\Omega}$ As the p-value is under 0.0001 in 99% of t-distribution, the strip-typed conductive fabric sensor is correlated with a dot-typed Ag/AgCl electrode by SPSS software. The strip-typed conductive fabric sensor has reliability when it is compared with a dot-typed Ag/AgCl electrode because most of bio-impedance values are in ${\pm}1.96$ standard deviation by Bland-Altman Analysis. As a result, the strip-typed conductive fabric sensor can be used for assessing knee movement through bio-impedance measurement method as a dot-typed Ag/AgCl electrode. Futhermore, the strip-typed conductive fabric sensor is available for wearable circumstances, applications and industries in the near future.

Developing the Non-contact Detection Sensor for sensing Fiber Selvage (원단 변사 감지를 위한 비접촉식 원단 변사 검출 센서 개발)

  • Lee, Dae-Hee;Lee, Jae-Yong
    • Journal of IKEEE
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    • v.20 no.4
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    • pp.454-458
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    • 2016
  • Generally, fix the end of the fabric to pin with the fabric tenter process. At this time, the pin fixing part of the fiber fabric bulges and deforms. The deformation of the textile causes deterioration of the quality of the textile product. Detection of fiber fabric selvage portion is always required in the processing of the fabric. This research is a non-contact sensor for sensing fiber selvage. In this study, Developed a non-contact fabric selvage detecting sensor for use in automatic selvage cutting system. For the production of the fabric selvage detecting sensor prototype it was produced by placing thirty two sensor 2.5 mm interval. The selvage sensor system experimentally confirmed that actual selvage detection is possible.

Performance Evaluation of Fabric Sensors for Movement-monitoring Smart Clothing: Based on the Experiment on a Dummy (동작 모니터링 스마트 의류를 위한 직물 센서의 성능 평가: 더미 실험을 중심으로)

  • Cho, Hyun-Seung;Park, Sun-Hyeong;Kang, Da-Hye;Lee, Kang-Hwi;Kang, Seung-Jin;Han, Bo-Ram;Oh, Jung-Hoon;Lee, Hae-Dong;Lee, Joo-Hyeon;Lee, Jeong-Whan
    • Science of Emotion and Sensibility
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    • v.18 no.4
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    • pp.25-34
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    • 2015
  • TThis study explored the requirement of fabric sensor that can measure the motion of the joint effectively by measuring and analyzing the variation in electric resistance of a sensor in accordance with bending and stretching motion of the arm by the implementation of a motion sensor utilizing conductive fabric. For this purpose, on both sides of two kinds of knitted fabric, namely 'L' fabric and 'W' fabric Single Wall Carbon Nano-Tube(SWCNT) was coated, fabric sensor was developed by finishing them in a variety of ways, and the sensor was attached to the arm band. The fabric sensor consisted of total 48 cases, namely background fabric for coating, the method of sensor attachment, the number of layer of sensors, the length of sensor, and the width of sensor. The performance of fabric motion sensors in terms of a dummy arm, that is, a Con-Trex MJ with 48 arm bands around it was evaluated. For each arm band, a total of 48, fastened around the dummy arm, it was adjusted to repeat the bending and stretching at the frequency : 0.5Hz, ROM : $20^{\circ}{\sim}120^{\circ}$, the voltage was recorded for each case after conducting three sets of repeat measurement for a total of 48 cases. As a result of the experiment, and as a consequences of the evaluation and analysis of the voltage based on the uniformity of the base line of the peak-to-peak voltage(Vp-p), the uniformity of Vp-p within the same set, and the uniformity of the Vp-p among three sets, the fabric sensors that have been configured in SWCNT coated 'L' fabric / welding / two layers / $50{\times}5mm$, $50{\times}10mm$, $100{\times}10mm$, and SWCNT coated 'W' fabric / welding / two layers / $50{\times}10mm$ exhibited the most uniform and stable signal value within 5% of the total variation rate. Through all these results of the experiment, it was confirmed that SWCNT coated fabric was suitable for a sensor that can measure the human limb operation when it was implemented as a fabric sensor in a variety of forms, and the optimal sensor types were identified.

Polyester (PET) Fabric dyed with Lead (II) acetate-based Colorimetric Sensor for Detecting Hydrogen Sulfide (H2S) (황화수소(H2S) 감지를 위한 아세트산 납이 침염된 폴리에스터(PET) 섬유 기반의 변색성 센서)

  • Lee, Junyeop;Do, Nam Gon;Jeong, Dong Hyuk;Jung, Dong Geon;An, Hee Kyung;Kong, Seong Ho;Jung, Daewoong
    • Journal of Sensor Science and Technology
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    • v.29 no.5
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    • pp.360-364
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    • 2020
  • In this study, the colorimetric sensor, polyester (PET) fabric dyed with lead (II) acetate (Pb(C2H3O2)2), was fabricated and characterized for the detection of the hydrogen sulfide (H2S). The surface morphology of the fabric was determined using scanning electron microscope and energy-dispersive X-ray spectroscopy. The optical properties of the fabric were evaluated by measuring the variation in the blue value of an RGB sensor. The fabric showed a significant color change, high linearity (R2 : 0.98256), and fast response time (< 1.0 s) when exposed to H2S. This is because the sensor is highly porous and permeable to the gas. The fabric can not only be used as a hydrogen sulfide sensor but also be used to detect and prevent H2S influx using sticky tape on pipelines.

Implementation of Wearable Sensor Glove using Pulse-wave Sensor, Conducting Fabric and Embedded System (맥파 측정 센서와 전도성 섬유, 임베디드 시스템 기반의 웨어러블 센서 글러브 구현)

  • Lee, Young-Bum;Lee, Byung-Woo;Lee, Myoung-Ho
    • Journal of Institute of Control, Robotics and Systems
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    • v.13 no.3
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    • pp.205-209
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    • 2007
  • Today, there are research trends about the wearable sensor device that measures various bio-signals and provides healthcare services to user using e-Health technology. This study describes the wearable sensor glove using pulse-wave sensor, conducting fabric and embedded system. This wearable sensor glove is based on the pulse-wave measurement system which is able to measure the pulse wave signal in much use of oriental medicine on the basis of a research trend of e-Health system.

A Study on the Development of Smart Athleisure Fashion Design for Night Riding (야간 라이딩을 위한 스마트 애슬레져 패션디자인 개발 연구)

  • Park, Se-Eun;Kim, Youn-Hee
    • Journal of the Korea Convergence Society
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    • v.11 no.8
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    • pp.115-122
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    • 2020
  • The purpose of this study is to develop the fabric electronics-based safety protection smart athleisure fashion for night riding. Based on the characteristic analysis of products being used during night riding, the fabric LED Display and fabric type capacitive touch sensor to emphasize human friendliness were designed in detachable form through an intuitive interface to develop the smart athleisure fashion of prototype. This is meaningful in that it proposed smart Athleisure fashion products differentiated from existing products, considering the functional aspects based on fabric electronics that emphasized human friendliness and the design aspects of the customized system that can diversify design through exchange and compatibility with other Athleisure products due to detachable form. Follow-up study will focus on the improvement of textile sensor fit for the physical properties of a textile with reinforced wearability and flexibility by using Fabric Electronics and proposed customized smart fashion based on it.

Implementation of the Wearable Sensor Glove Using EDA Sensor and Conducting Fabric

  • Lee, Young-Bum;Lee, Byung-Woo;Choo, Young-Min;Kim, Jin-Kwon;Jung, Wan-Jin;Kang, Dae-Hoon;Lee, Myoung-Ho
    • Journal of Biomedical Engineering Research
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    • v.28 no.2
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    • pp.280-286
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    • 2007
  • The wearable sensor glove was developed using EDA sensors and conducting fabric. EDA(Electro-dermal Activity) signal is an electric response of human skin. There are SIL(Skin Impedance Level) and SIR(Skin Impedance Response) in EDA. SIL consists mostly of a DC component while SIR consists of an AC component. The relationship between drowsiness and the EDA signal is utilized. EDA sensors were made using a conducting fabric instead of AgCl electrodes, for a more suitable, more wearable device. The EDA signal acquisition module was made by connecting the EDA sensor gloves through conductive fabric lines. Also, the EDA signal acquisition module can be connected to a PC that shows the results of the EDA signal processing analysis and gives proper feedback to the user. This system can be used in various applications to detect drowsiness and prevent accidents from drowsiness for automobile drivers.

Development of fabric-based optical fiber tactile sensor using optical fiber bending loss (광섬유 굽힘 손실을 이용한 직물 기반의 광섬유 촉각센서 개발)

  • Kim, Ju-Young;Baek, Sang-Ho;Lee, Jung-Ju
    • Journal of Sensor Science and Technology
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    • v.18 no.3
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    • pp.210-216
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    • 2009
  • In this paper the tactile sensor system based on the bending loss of optical fiber sensor is presented. The sensor array was designed with fabric structure. The optical measuring system was composed of LED for light source and CCD camera for the signal light detector. Performance of this tactile sensor system was evaluated in various environments and compared with Harmon's design criteria. The result shows that load range is 3 g$\sim$100 g, resolution is 1.5 g, hysteresis error is 1.5%. The response linearity is good and flexibility of sensor array is excellent.

Optimization of SWCNT-Coated Fabric Sensors for Human Joint Motion Sensing

  • Cho, Hyun-Seung;Park, Seon-Hyung;Yang, Jin-Hee;Park, Su-Youn;Han, Bo-Ram;Kim, Jin-Sun;Lee, Hae-Dong;Lee, Kang-Hwi;Lee, Jeong-Whan;Kang, Bok-Ku;Chon, Chang-Soo;Kim, Han-Sung;Lee, Joo-Hyeon
    • Journal of Electrical Engineering and Technology
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    • v.13 no.5
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    • pp.2059-2066
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    • 2018
  • This study explored the feasibility of utilizing an SWCNT-coated fabric sensor for the development of a wearable motion sensing device. The extent of variation in electric resistance of the sensor material was evaluated by varying the fiber composition of the SWCNT-coated base fabrics, attachment methods, number of layers, and sensor width and length. 32 sensors were fabricated by employing different combinations of these variables. Using a custom-built experimental jig, the amount of voltage change in a fabric sensor as a function of the length was measured as the fabric sensors underwent loading-unloading test with induced strains of 30 %, 40 %, and 50 % at a frequency of 0.5 Hz. First-step analysis revealed the following: characteristics of the strain-voltage curves of the fabric sensors confirmed that 14 out of 32 sensors were evaluated as more suitable for measuring human joint movement, as they yield stable resistance values under tension-release conditions; furthermore, significantly stable resistance values were observed at each level of strain. Secondly, we analyzed the averaged maximum, minimum, and standard deviations at various strain levels. From this analysis, it was determined that the two-layer sensor structure and welding attachment method contributed to the improvement of sensing accuracy.

Excitation Frequency Characteristics of a Conductive Fabric Sensor Using the Bio-impedance for Estimating Knee Joint Movements (슬관절 운동 평가를 위한 생체 임피던스 측정용 전도성 섬유 센서의 여기 주파수별 특성 평가)

  • Lee, Byung-Woo;Lee, Chung-Keun;Kim, Jin-Kwon;Jeong, Wan-Jin;Lee, Myoung-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.7
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    • pp.1427-1433
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    • 2011
  • This study describes a conductive fabric sensor and determines an optimum excitation frequency of the sensor to evaluate knee joint movements. Subjects were composed of 15 males (age: $30.7{\pm}5.3$) with no known problems with their knee joints. The upper side of subjects' lower limbs was divided into two areas and the lower side of subjects' lower limbs was divided into three areas. The sensors were attached to 1 for 3 spot from a hip joint and to 3 for 4 spot from a knee joint which are the optimum conductive fabric sensor configuration to evaluate knee joint movements. As a result, the optimum excitation frequency for evaluating knee joint movements using conductive fabric sensors was 25 kHz. Average and standard deviation of bio-impedance changes from 15 subjects were $92.1{\pm}137.2{\Omega}$ at 25 kHz. The difference of bio-impedance changes between 25 kHz and 50 kHz was statistically significant (p<0.05) and the difference of bio-impedance changes between 25 kHz and 100 kHz was also statistically significant (p<0.001). These results showed that conductive fabric sensors are more sensitive to measure bio-impedance for evaluating knee joint movements as an excitation frequency decreases.