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|標題:||Performance Evaluation of an Infrared Thermocouple||作者:||Chen, C.C.
|關鍵字:||infrared thermocouple;thermometer;calibration equation;leaf;temperature;leaf temperature;thermometry;calibration;water||Project:||Sensors||期刊/報告no：:||Sensors, Volume 10, Issue 11, Page(s) 10081-10094.||摘要:||
The measurement of the leaf temperature of forests or agricultural plants is an important technique for the monitoring of the physiological state of crops. The infrared thermometer is a convenient device due to its fast response and nondestructive measurement technique. Nowadays, a novel infrared thermocouple, developed with the same measurement principle of the infrared thermometer but using a different detector, has been commercialized for non-contact temperature measurement. The performances of two-kinds of infrared thermocouples were evaluated in this study. The standard temperature was maintained by a temperature calibrator and a special black cavity device. The results indicated that both types of infrared thermocouples had good precision. The error distribution ranged from -1.8 degrees C to 18 degrees C as the reading values served as the true values. Within the range from 13 degrees C to 37 degrees C, the adequate calibration equations were the high-order polynomial equations. Within the narrower range from 20 degrees C to 35 degrees C, the adequate equation was a linear equation for one sensor and a two-order polynomial equation for the other sensor. The accuracy of the two kinds of infrared thermocouple was improved by nearly 0.4 degrees C with the calibration equations. These devices could serve as mobile monitoring tools for in situ and real time routine estimation of leaf temperatures.
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