A Three-dimensional Finger Motion Measurement System of a Thumb and an Index Finger Without a Calibration Process
Various wearable systems have been investigated to measure hand motion, but some challenges remain. Many systems require a calibration process to map sensor signals to actual finger joint angles by the principle of measuring the length change of the finger, or bending sensors. Also, few studies have...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-01-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/20/3/756 |
| _version_ | 1811183814404210688 |
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| author | Yeongyu Park Joonbum Bae |
| author_facet | Yeongyu Park Joonbum Bae |
| author_sort | Yeongyu Park |
| collection | DOAJ |
| description | Various wearable systems have been investigated to measure hand motion, but some challenges remain. Many systems require a calibration process to map sensor signals to actual finger joint angles by the principle of measuring the length change of the finger, or bending sensors. Also, few studies have investigated how to measure thumb motion accurately using the wearable systems. This paper proposes an exoskeleton system with linear Hall sensors to measure three-dimensional hand motion without a calibration process. The calibration process is avoided by measuring finger joint angles through an absolute rotation measurement. A new wearing method with lower parts underneath the hand joints and rubber bands is proposed to fix the structure to the hand and adapt it for various hand sizes. As the thumb has a complex biomechanical feature at carpometacarpal (CMC) joint, a new measuring method of the CMC joint is proposed to directly calculate the orientation of the metacarpal. The prototype of the thumb and index finger was manufactured, and the performance was verified experimentally by using an optical motion capture system. |
| first_indexed | 2024-04-11T13:04:01Z |
| format | Article |
| id | doaj.art-a58921687afb4d688f165beb1f57bd5e |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T13:04:01Z |
| publishDate | 2020-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-a58921687afb4d688f165beb1f57bd5e2022-12-22T04:22:51ZengMDPI AGSensors1424-82202020-01-0120375610.3390/s20030756s20030756A Three-dimensional Finger Motion Measurement System of a Thumb and an Index Finger Without a Calibration ProcessYeongyu Park0Joonbum Bae1Department of Mechanical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, KoreaDepartment of Mechanical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, KoreaVarious wearable systems have been investigated to measure hand motion, but some challenges remain. Many systems require a calibration process to map sensor signals to actual finger joint angles by the principle of measuring the length change of the finger, or bending sensors. Also, few studies have investigated how to measure thumb motion accurately using the wearable systems. This paper proposes an exoskeleton system with linear Hall sensors to measure three-dimensional hand motion without a calibration process. The calibration process is avoided by measuring finger joint angles through an absolute rotation measurement. A new wearing method with lower parts underneath the hand joints and rubber bands is proposed to fix the structure to the hand and adapt it for various hand sizes. As the thumb has a complex biomechanical feature at carpometacarpal (CMC) joint, a new measuring method of the CMC joint is proposed to directly calculate the orientation of the metacarpal. The prototype of the thumb and index finger was manufactured, and the performance was verified experimentally by using an optical motion capture system.https://www.mdpi.com/1424-8220/20/3/756wearable systemfinger motion measurementthumb motioncalibration process |
| spellingShingle | Yeongyu Park Joonbum Bae A Three-dimensional Finger Motion Measurement System of a Thumb and an Index Finger Without a Calibration Process Sensors wearable system finger motion measurement thumb motion calibration process |
| title | A Three-dimensional Finger Motion Measurement System of a Thumb and an Index Finger Without a Calibration Process |
| title_full | A Three-dimensional Finger Motion Measurement System of a Thumb and an Index Finger Without a Calibration Process |
| title_fullStr | A Three-dimensional Finger Motion Measurement System of a Thumb and an Index Finger Without a Calibration Process |
| title_full_unstemmed | A Three-dimensional Finger Motion Measurement System of a Thumb and an Index Finger Without a Calibration Process |
| title_short | A Three-dimensional Finger Motion Measurement System of a Thumb and an Index Finger Without a Calibration Process |
| title_sort | three dimensional finger motion measurement system of a thumb and an index finger without a calibration process |
| topic | wearable system finger motion measurement thumb motion calibration process |
| url | https://www.mdpi.com/1424-8220/20/3/756 |
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