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首页> 外文期刊>Review of Scientific Instruments >Microcomputer‐based system for the measurement of transpiration rate in trees by the heat pulse method
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Microcomputer‐based system for the measurement of transpiration rate in trees by the heat pulse method

机译：基于微计算机的热脉冲法测量树木蒸腾速率的系统

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A microcomputer‐based system was designed to measure water transport in trees by the heat pulse method. The system comprises a heater probe as a heat source and a thermistor, incorporated into a bridge which is automatically balanced by the microcomputer. The overall dynamic range of the system for temperature is 22 bits and the resolution for temperature determination is about 1.45×10-4 °C. The elapsed time between the heat pulse injection and the thermal peak at the thermistor is calculated by the microcomputer. The computation program includes algorithms for base‐line slope correction and a noise immune derivative evaluating routine for peak recognition. The system was tested in the laboratory and in the field on a citrus tree.
机译：设计了一个基于微机的系统，通过热脉冲法测量树木中的水分传输。该系统包括一个作为热源的加热器探头和一个热敏电阻，热敏电阻被并入一个桥中，桥由微计算机自动平衡。该系统的整体温度动态范围为22位，温度确定的分辨率约为1.45×10-4°C。微型计算机计算在热脉冲注入和热敏电阻上的热峰值之间经过的时间。该计算程序包括用于基线斜率校正的算法和用于峰识别的抗噪导数评估程序。该系统在实验室和柑桔树上进行了现场测试。

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