Patent ID: 6957584
Filing Date: 2005-10-25
Classification: G01L

Abstract:
1. A temperature compensated strain gauge assembly comprising a strain gauge having two or more resistors or piezoresistors in half-bridge or full-bridge configuration and one or more temperature compensating resistors or piezoresistors connected in series with the bridge resistors or piezoresistors, the resistance of the temperature compensating resistor(s) or piezoresistor(s) being such that, as temperature changes, the or each compensating resistor or piezoresistor acts to: (a) compensate for a change in span of the strain gauge so that, for a given load (as defined herein) applied to the substrate, the span of the stain gauge will remain constant or substantially constant; and (b) compensate the null shift of the strain gauge when the resistance value(s) of the bridge resistor(s) or piezoresistor(s) are such as to provide a known offset at a given temperature.