INFRARED THERMOMETRY OF VEGETATION
INFRARED THERMOMETRY OF VEGETATION
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DOI：
10.2134/agronj1966.00021962005800060014x
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发表时间：
1966-01-01
期刊：
影响因子：
2.1
通讯作者：
TANNER, CB
中科院分区：
文献类型：
--
作者：
FUCHS, M;TANNER, CB
带通滤光器的红外温度计可用于测量植物表面的真实温度，误差范围为0.1C至0.3C。为此，必须已知或确定发射率，并对来自环境的反射辐射进行校正。紫花苜蓿和苏丹草密度冠层的比辐射率介于0.97和0.98之间。油豆和烟草单叶的发射率分别为0.96和0.97。根据周围环境的辐射，这些表面的视辐射温度必须加上+0.6C到+1.4C的修正，才能得到真实的表面温度。
Infrared thermometers with a bandpass filter from 8[mu] to 13[mu] can be used to measure the real temperature of vegetal surfaces with errors in the range of 0.1C to 0.3C To do this the emissivity must be either known or determined and a correction accounting for the reflected radiation from the surroundings must be made. Values of emissivities found for dense canopies of alfalfa and of sudangrass were between 0.97 and 0.98. Emissivities of single leaves of snap bean and tobacco were 0.96 and 0.97, respectively. Depending upon the radiation of the surroundings corrections of +0.6C to +1.4C had to be added to the apparent radiative temperature of these surfaces in order to yield real surface temperature.