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US 2006/0123647 A1Published application
Precision dendrometer
AssigneeVerdtech Nuevo Campo, S.A.
InventorMoshe Amar
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AssigneeVerdtech Nuevo Campo, S.A.
InventorMoshe Amar
Estimating the term…
Based on the proportion that exists between the length of a conductive material and its electrical resistance and using a Wheatstone bridge type circuit, with four resistances to which a given input voltage is applied, and when the bridge is in balance the output voltage is zero, consists of using as such resistances respective extension measurement bands, based on a grid (1) mounted on an electrically insulating support (2), in such a way that preferably two of said grids (1) are orientated in a principal direction of maximum deformation, whereas the other two (1′) are in a direction at right angle to the previous one, in such a way that the dimensional variations of said bands, determined by the increase or reduction in the dimensions of the tree or plant to be controlled, create an output voltage, positive or negative, which proportionally corresponds with said measurement increase or decrease.
- Precision dendrometer, of the type based on the use of extension measurement bands as resistances for a Wheatstone Bridge type circuit, that said dendrometer consists of a sensor holder that serves as a part for securing the dendrometer to a plant, the electronic interface that connects it to the data collector equipment and a sensor;
- Precision dendrometer, according to the previous claim, characterised in that the end of the aluminium sheet (10) in contact with the plant has a double bend with convergent side edges, forming an approximately triangular angular and rounded end (11).
- Precision dendrometer, according to claim 1, characterised in that the sensor holder (15) has a part with a cylindrical cavity where the cylindrical body (13) of the sensor is housed and held, a number of rods (16) acting as feet being connected with said part of the sensor holder (15), to which a part (17), for adjusting and securing to the plant (8) in which the dendrometer is installed, is linked.
- Precision dendrometer, according to claim 3, characterised in that the rods (16) are fabricated from material that has zero coefficient of expansion, to allow the constant variation microns of the plant (18) to be measured.