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Determining the leaf emissivity of three crops by infrared thermometry.

Chen C - Sensors (Basel) (2015)

Bottom Line: Emissivity differed significantly between leaves of Malabar chestnut and the two orchids.The range of emissivities determined in this study was similar to that in the literature.The method developed in this study is a real-time, in situ technique and could be used for agricultural and forestry plants.

View Article: PubMed Central - PubMed

Affiliation: Department of Bio-industrial Mechatronics Engineering, National ChungHsing University, 250 Kuokuang Road, Taichung 40227, Taiwan. ccchen@dragon.nchu.edu.tw.

ABSTRACT
Plant temperature can provide important physiological information for crop management. Non-contact measurement with an infrared thermometer is useful for detecting leaf temperatures. In this study, a novel technique was developed to measure leaf emissivity using an infrared thermometer with an infrared sensor and a thermocouple wire. The measured values were transformed into true temperatures by calibration equations to improve the measurement accuracy. The relationship between two kinds of measurement temperatures and setting emissivities was derived as a model for calculating of true emissivity. The emissivities of leaves of three crops were calculated by the mathematical equation developed in this study. The mean emissivities were 0.9809, 0.9783, 0.981 and 0.9848 for Phalaenopsis mature and new leaves and Paphiopedilum and Malabar chestnut leaves, respectively. Emissivity differed significantly between leaves of Malabar chestnut and the two orchids. The range of emissivities determined in this study was similar to that in the literature. The precision of the measurement is acceptable. The method developed in this study is a real-time, in situ technique and could be used for agricultural and forestry plants.

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Related in: MedlinePlus

Typical distribution of the original and transformed measured data for Paphiopedilum leaves. (a) Original temperature data; (b) Transformed data.
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sensors-15-11387-f003: Typical distribution of the original and transformed measured data for Paphiopedilum leaves. (a) Original temperature data; (b) Transformed data.

Mentions: The typical distribution of the original and transformed temperature for Paphiopedilum leaves is shown in Figure 3.


Determining the leaf emissivity of three crops by infrared thermometry.

Chen C - Sensors (Basel) (2015)

Typical distribution of the original and transformed measured data for Paphiopedilum leaves. (a) Original temperature data; (b) Transformed data.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4481894&req=5

sensors-15-11387-f003: Typical distribution of the original and transformed measured data for Paphiopedilum leaves. (a) Original temperature data; (b) Transformed data.
Mentions: The typical distribution of the original and transformed temperature for Paphiopedilum leaves is shown in Figure 3.

Bottom Line: Emissivity differed significantly between leaves of Malabar chestnut and the two orchids.The range of emissivities determined in this study was similar to that in the literature.The method developed in this study is a real-time, in situ technique and could be used for agricultural and forestry plants.

View Article: PubMed Central - PubMed

Affiliation: Department of Bio-industrial Mechatronics Engineering, National ChungHsing University, 250 Kuokuang Road, Taichung 40227, Taiwan. ccchen@dragon.nchu.edu.tw.

ABSTRACT
Plant temperature can provide important physiological information for crop management. Non-contact measurement with an infrared thermometer is useful for detecting leaf temperatures. In this study, a novel technique was developed to measure leaf emissivity using an infrared thermometer with an infrared sensor and a thermocouple wire. The measured values were transformed into true temperatures by calibration equations to improve the measurement accuracy. The relationship between two kinds of measurement temperatures and setting emissivities was derived as a model for calculating of true emissivity. The emissivities of leaves of three crops were calculated by the mathematical equation developed in this study. The mean emissivities were 0.9809, 0.9783, 0.981 and 0.9848 for Phalaenopsis mature and new leaves and Paphiopedilum and Malabar chestnut leaves, respectively. Emissivity differed significantly between leaves of Malabar chestnut and the two orchids. The range of emissivities determined in this study was similar to that in the literature. The precision of the measurement is acceptable. The method developed in this study is a real-time, in situ technique and could be used for agricultural and forestry plants.

Show MeSH
Related in: MedlinePlus