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1. US5224769 - Method and device for non-invasive monitoring of hydration state of plants

Office
États-Unis d'Amérique
Numéro de la demande 07816737
Date de la demande 03.01.1992
Numéro de publication 5224769
Date de publication 06.07.1993
Numéro de délivrance 5224769
Date de délivrance 06.07.1993
Type de publication A
CIB
G01N 27/22
GPHYSIQUE
01MÉTROLOGIE; TESTS
NRECHERCHE OU ANALYSE DES MATÉRIAUX PAR DÉTERMINATION DE LEURS PROPRIÉTÉS CHIMIQUES OU PHYSIQUES
27Recherche ou analyse des matériaux par l'emploi de moyens électriques, électrochimiques ou magnétiques
02en recherchant l'impédance
22en recherchant la capacité
CPC
G01N 27/223
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
27Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
02by investigating impedance
22by investigating capacitance
223for determining moisture content, e.g. humidity
Déposants University of Florida
Inventeurs Holbrook Noel M.
Burns Michael J.
Mandataires Kerkam, Stowell, Kondracki & Clarke
Titre
(EN) Method and device for non-invasive monitoring of hydration state of plants
Abrégé
(EN)

A system for the non-invasive monitoring of the hydration state of a plant comprising the elements: PA0 a timing capacitor comprising a plurality of conductive elements adapted for mounting on a plant part to sense the hydration state capacitance of the plant part; PA0 a capacitance-to-frequency converter electrically connected to the timing capacitor comprising an oscillator circuit having a frequency dependent upon the value of the timing capacitor and independent of the electrical losses in said timing capacitor; PA0 means for supplying electrical power to the capacitance-to-frequency converter; PA0 means for measuring the frequency generated by the capacitance-to-frequency converter, the frequency bearing a known relationship to the dielectric constant and, hence, the water content of the plant part; and PA0 devices for electrically guarding the circuit generated by the elements from capacitance extraneous to the plant part comprising means for surrounding the elements with shields of electrical potential substantially equal to that of the timing capacitor.


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