Geometrical instruments – Gauge – Comparator
Reexamination Certificate
2008-07-15
2008-07-15
Guadalupe-McCall, Yaritza (Department: 2859)
Geometrical instruments
Gauge
Comparator
C033S555100
Reexamination Certificate
active
10531312
ABSTRACT:
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.
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“Strain gauges and load cells,” RS Data Sheet, Mar. 1997 No. 232-5957, Data Pack E, RS Components.
Colin H. Daly, “Basics of Strain Measurement,” Oct. 2000.
Guadalupe-McCall Yaritza
Verdtech Nuevo Campo, S.A.
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