Microcomputer-based system for the measurement of transpiration rate in trees by the heat pulse method

Sam Ben-Yaakov; Yeheskel Cohen; Magenia Roshansky

doi:10.1063/1.1138119

Microcomputer-based system for the measurement of transpiration rate in trees by the heat pulse method

Sam Ben-Yaakov, Yeheskel Cohen, Magenia Roshansky

Department of Electrical & Computer Engineering

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	1652-1656
Number of pages	5
Journal	Review of Scientific Instruments
Volume	56
Issue number	8
DOIs	https://doi.org/10.1063/1.1138119
State	Published - 1 Jan 1985

ASJC Scopus subject areas

Instrumentation

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10.1063/1.1138119

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title = "Microcomputer-based system for the measurement of transpiration rate in trees by the heat pulse method",

abstract = "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.",

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AB - 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.

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Microcomputer-based system for the measurement of transpiration rate in trees by the heat pulse method

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