A Unilateral Nuclear Magnetic Resonance Sensor for Nondestructive Wood Moisture Measurements
An unilateral nuclear magnetic resonance (UMR) sensor was designed to measure wood moisture nondestructively. The sensor consisted of a unilateral magnet, an anti-eddy current module, a radiofrequency (RF) coil and an impedance matching and tuning circuit. The sensor produced a static magnetic field...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
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Science Press
2017-12-01
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| Series: | Chinese Journal of Magnetic Resonance |
| Subjects: | |
| Online Access: | http://html.rhhz.net/bpxzz/html/20170412.htm |
| _version_ | 1818023549356474368 |
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| author | YU Deng-jie GUO Pan WU Jia-min HE Yu-cheng XU Zheng |
| author_facet | YU Deng-jie GUO Pan WU Jia-min HE Yu-cheng XU Zheng |
| author_sort | YU Deng-jie |
| collection | DOAJ |
| description | An unilateral nuclear magnetic resonance (UMR) sensor was designed to measure wood moisture nondestructively. The sensor consisted of a unilateral magnet, an anti-eddy current module, a radiofrequency (RF) coil and an impedance matching and tuning circuit. The sensor produced a static magnetic field of 71.1 mT (resonant frequency:3.027 MHz) in a 50 mm×50 mm plane locating 75 mm above the sensor's surface. Preliminary nondestructive measurement of wood moisture was carried out with the sensor. The moisture distribution in the radical direction of a cylindrical wood sample was scanned. Variations in transverse relaxation time (T2) from the bark to core were obtained. Evaporation of moisture during wood drying was also measured with the UMR sensor. Experimental results showed that:the peak of long T2 component in the T2 spectrum moved to left and the peak integral area decreased gradually during drying. The integral area was proportional to the moisture content of the sample. The work presents a portable UMR device for wood research which may potentially be used for nondestructive moisture measurement on living trees in situ. |
| first_indexed | 2024-12-10T03:46:05Z |
| format | Article |
| id | doaj.art-efc0ec3638524376a26dc7fa64bdd925 |
| institution | Directory Open Access Journal |
| issn | 1000-4556 1000-4556 |
| language | zho |
| last_indexed | 2024-12-10T03:46:05Z |
| publishDate | 2017-12-01 |
| publisher | Science Press |
| record_format | Article |
| series | Chinese Journal of Magnetic Resonance |
| spelling | doaj.art-efc0ec3638524376a26dc7fa64bdd9252022-12-22T02:03:26ZzhoScience PressChinese Journal of Magnetic Resonance1000-45561000-45562017-12-0134450851810.11938/cjmr20172561A Unilateral Nuclear Magnetic Resonance Sensor for Nondestructive Wood Moisture MeasurementsYU Deng-jie0GUO Pan1WU Jia-min2HE Yu-cheng3XU Zheng4State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, ChinaCollege of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, ChinaState Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, ChinaState Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, ChinaState Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, ChinaAn unilateral nuclear magnetic resonance (UMR) sensor was designed to measure wood moisture nondestructively. The sensor consisted of a unilateral magnet, an anti-eddy current module, a radiofrequency (RF) coil and an impedance matching and tuning circuit. The sensor produced a static magnetic field of 71.1 mT (resonant frequency:3.027 MHz) in a 50 mm×50 mm plane locating 75 mm above the sensor's surface. Preliminary nondestructive measurement of wood moisture was carried out with the sensor. The moisture distribution in the radical direction of a cylindrical wood sample was scanned. Variations in transverse relaxation time (T2) from the bark to core were obtained. Evaporation of moisture during wood drying was also measured with the UMR sensor. Experimental results showed that:the peak of long T2 component in the T2 spectrum moved to left and the peak integral area decreased gradually during drying. The integral area was proportional to the moisture content of the sample. The work presents a portable UMR device for wood research which may potentially be used for nondestructive moisture measurement on living trees in situ.http://html.rhhz.net/bpxzz/html/20170412.htmunilateral nuclear magnetic resonance (UMR)sensorwoodmoisturenon-destructive detection |
| spellingShingle | YU Deng-jie GUO Pan WU Jia-min HE Yu-cheng XU Zheng A Unilateral Nuclear Magnetic Resonance Sensor for Nondestructive Wood Moisture Measurements Chinese Journal of Magnetic Resonance unilateral nuclear magnetic resonance (UMR) sensor wood moisture non-destructive detection |
| title | A Unilateral Nuclear Magnetic Resonance Sensor for Nondestructive Wood Moisture Measurements |
| title_full | A Unilateral Nuclear Magnetic Resonance Sensor for Nondestructive Wood Moisture Measurements |
| title_fullStr | A Unilateral Nuclear Magnetic Resonance Sensor for Nondestructive Wood Moisture Measurements |
| title_full_unstemmed | A Unilateral Nuclear Magnetic Resonance Sensor for Nondestructive Wood Moisture Measurements |
| title_short | A Unilateral Nuclear Magnetic Resonance Sensor for Nondestructive Wood Moisture Measurements |
| title_sort | unilateral nuclear magnetic resonance sensor for nondestructive wood moisture measurements |
| topic | unilateral nuclear magnetic resonance (UMR) sensor wood moisture non-destructive detection |
| url | http://html.rhhz.net/bpxzz/html/20170412.htm |
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