Passive infrared camera measurements demonstrate modest effect of mechanically induced internal voids on Dracaena fragrans stem temperature
The use of infrared cameras as a tree diagnostic device was proposed on the basis that internal defects reduce thermal conductivity and surface temperatures, but existing research has failed to demonstrate a clear connection between these two features. Consequently, two experiments were designed to...
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sg-ntu-dr.10356-972262020-03-07T11:43:44Z Passive infrared camera measurements demonstrate modest effect of mechanically induced internal voids on Dracaena fragrans stem temperature Leong, Eng Choon Fong, Yok-King Burcham, Daniel C. School of Civil and Environmental Engineering The use of infrared cameras as a tree diagnostic device was proposed on the basis that internal defects reduce thermal conductivity and surface temperatures, but existing research has failed to demonstrate a clear connection between these two features. Consequently, two experiments were designed to evaluate the effect of internal voids on stem surface temperature. Cylindrical voids were created in 5 cm diameter stems of Dracaena fragrans by mechanically removing internal tissue. In each experiment, the dimension of internal voids varied among five experimental treatments with two controls. Infrared (IR) images were collected by directly focusing the camera on the stem surfaces concealing internal voids. Infrared images were analyzed using a concurrent mixed methods approach, including qualitative image evaluation and quantitative surface temperature analysis. In each experiment, IR image evaluation revealed a noticeable reduction in surface temperature around the largest void size (3.8 cm). Analyses of linear temperature trending and surface temperature mostly corroborated the visual evaluation. The average temperature above the largest void size was 0.4–0.6 °C lower than other treatments, which remained substantially similar to one another. Overall, these results suggest the technique is exclusively able to identify relatively large internal defects occupying at least 76% of the stem cross-sectional area. 2013-07-17T06:57:11Z 2019-12-06T19:40:22Z 2013-07-17T06:57:11Z 2019-12-06T19:40:22Z 2012 2012 Journal Article Burcham, D. C., Leong, E.-C., & Fong, Y.-K. (2012). Passive infrared camera measurements demonstrate modest effect of mechanically induced internal voids on Dracaena fragrans stem temperature. Urban Forestry & Urban Greening, 11(2), 169-178. 1618-8667 https://hdl.handle.net/10356/97226 http://hdl.handle.net/10220/11757 10.1016/j.ufug.2012.01.001 en Urban forestry & urban greening © 2012 Elsevier GmbH. |
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The use of infrared cameras as a tree diagnostic device was proposed on the basis that internal defects reduce thermal conductivity and surface temperatures, but existing research has failed to demonstrate a clear connection between these two features. Consequently, two experiments were designed to evaluate the effect of internal voids on stem surface temperature. Cylindrical voids were created in 5 cm diameter stems of Dracaena fragrans by mechanically removing internal tissue. In each experiment, the dimension of internal voids varied among five experimental treatments with two controls. Infrared (IR) images were collected by directly focusing the camera on the stem surfaces concealing internal voids. Infrared images were analyzed using a concurrent mixed methods approach, including qualitative image evaluation and quantitative surface temperature analysis. In each experiment, IR image evaluation revealed a noticeable reduction in surface temperature around the largest void size (3.8 cm). Analyses of linear temperature trending and surface temperature mostly corroborated the visual evaluation. The average temperature above the largest void size was 0.4–0.6 °C lower than other treatments, which remained substantially similar to one another. Overall, these results suggest the technique is exclusively able to identify relatively large internal defects occupying at least 76% of the stem cross-sectional area. |
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School of Civil and Environmental Engineering |
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School of Civil and Environmental Engineering Leong, Eng Choon Fong, Yok-King Burcham, Daniel C. |
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Leong, Eng Choon Fong, Yok-King Burcham, Daniel C. |
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Leong, Eng Choon Fong, Yok-King Burcham, Daniel C. Passive infrared camera measurements demonstrate modest effect of mechanically induced internal voids on Dracaena fragrans stem temperature |
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Leong, Eng Choon |
title |
Passive infrared camera measurements demonstrate modest effect of mechanically induced internal voids on Dracaena fragrans stem temperature |
title_short |
Passive infrared camera measurements demonstrate modest effect of mechanically induced internal voids on Dracaena fragrans stem temperature |
title_full |
Passive infrared camera measurements demonstrate modest effect of mechanically induced internal voids on Dracaena fragrans stem temperature |
title_fullStr |
Passive infrared camera measurements demonstrate modest effect of mechanically induced internal voids on Dracaena fragrans stem temperature |
title_full_unstemmed |
Passive infrared camera measurements demonstrate modest effect of mechanically induced internal voids on Dracaena fragrans stem temperature |
title_sort |
passive infrared camera measurements demonstrate modest effect of mechanically induced internal voids on dracaena fragrans stem temperature |
publishDate |
2013 |
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https://hdl.handle.net/10356/97226 http://hdl.handle.net/10220/11757 |
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1681034003456458752 |