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https://hdl.handle.net/2440/57328
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Type: | Journal article |
Title: | A log-antilog analog control circuit for constant-power warm-thermistor sensors: application to plant water status measurement |
Author: | Skinner, A. Lambert, M. |
Citation: | IEEE Sensors Journal, 2009; 9(9):1049-1057 |
Publisher: | The Institute of Electrical and Electronic Engineers Inc. |
Issue Date: | 2009 |
ISSN: | 1530-437X 1558-1748 |
Statement of Responsibility: | Andrew J. Skinner and Martin F. Lambert |
Abstract: | Warm-thermistor sensors are useful for making measurements of flow and the thermal properties of materials. This paper describes a log-antilog analog control circuit capable of monitoring a thermistor's internal temperature in both ambient temperature sensing mode and self-heating mode, while maintaining infinite precision, wide dynamic range and fast sensor response. A single self-referencing thermistor is used to avoid the problems associated with having to match a thermistor pair in order to obtain an over-temperature signal. Instead, thermistor power levels are switched over a range of 1:1000, allowing measurement of both ambient temperature and heated thermistor temperature during the rise and fall of the heat pulse by a single thermistor at the center of the heat field. This provides a sensitive measurement of the thermal diffusivity and advective properties of the surrounding medium. In this paper, such a sensor is used to investigate the thermal properties of a grapevine cane under conditions of irrigation stress. |
Keywords: | Log-antilog plant water status thermal diffusivity sensor warm thermistor sensors. |
Description: | © Copyright 2009 IEEE |
DOI: | 10.1109/JSEN.2009.2024057 |
Published version: | http://dx.doi.org/10.1109/jsen.2009.2024057 |
Appears in Collections: | Aurora harvest 5 Civil and Environmental Engineering publications Environment Institute publications |
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