A log-antilog analog control circuit for constant-power warm-thermistor sensors: application to plant water status measurement
| dc.contributor.author | Skinner, A. | |
| dc.contributor.author | Lambert, M. | |
| dc.date.issued | 2009 | |
| dc.description | © Copyright 2009 IEEE | |
| dc.description.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. | |
| dc.description.statementofresponsibility | Andrew J. Skinner and Martin F. Lambert | |
| dc.identifier.citation | IEEE Sensors Journal, 2009; 9(9):1049-1057 | |
| dc.identifier.doi | 10.1109/JSEN.2009.2024057 | |
| dc.identifier.issn | 1530-437X | |
| dc.identifier.issn | 1558-1748 | |
| dc.identifier.orcid | Lambert, M. [0000-0001-8272-6697] | |
| dc.identifier.uri | http://hdl.handle.net/2440/57328 | |
| dc.language.iso | en | |
| dc.publisher | The Institute of Electrical and Electronic Engineers Inc. | |
| dc.source.uri | https://doi.org/10.1109/jsen.2009.2024057 | |
| dc.subject | Log-antilog | |
| dc.subject | plant water status | |
| dc.subject | thermal diffusivity sensor | |
| dc.subject | warm thermistor sensors. | |
| dc.title | A log-antilog analog control circuit for constant-power warm-thermistor sensors: application to plant water status measurement | |
| dc.type | Journal article | |
| pubs.publication-status | Published |