An automatic optical fibre feedback potometer for transpiration studies

Autor:	J. J. Irvine, Sillas Hadjiloucas, M.J. Usher, D. A. Keating
Rok vydání:	1996
Předmět:	Total internal reflection Materials science Optical fiber business.industry Transductor Applied Mathematics Acoustics Detector Potometer law.invention Optics Transducer law Sensitivity (control systems) business Instrumentation Engineering (miscellaneous) Common emitter
Zdroj:	Measurement Science and Technology. 7:1611-1618
ISSN:	1361-6501 0957-0233
DOI:	10.1088/0957-0233/7/11/010
Popis:	A new automatic feedback potometer for physiological studies of water uptake by root systems is described. A dual-optical-fibre amplitude-modulating displacement transducer of improved sensitivity is employed to detect the changes in liquid level. The merits of optimal double-cut fibres, which make full use of the critical angle and improve coupling between the emitter and the receiver, have resulted in a sensor that is 64 times more responsive than the simple emitter - detector probe. Positioning the optical fibre transducer in a narrow capillary and using feedback to control the liquid level allows continuous measurement of volumes in the nanolitre range. The optical sensor used does not need re-calibration for the different salt solutions used in such studies.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::50202ba39e7e9d1d007e9fc3d612eadd https://doi.org/10.1088/0957-0233/7/11/010 Zobrazit plný text záznamu