Question

What factors, not including thermal mismatch to the substrate, contribute to a change in gauge response as the temperature of the gauge changes?

Answer 1

Temperature changes during measurements with gauge can have undesirable effects on the accuracy of the measurements.

As the temerattemp changes there r several factors which comes into picture that affect the gauge.

Some of the factors are :-

1. Thermal Expansion of Gauge Materials.

2. Change in the resistance of Wire.

a.) Thermal expansion - It is the property of materials to expand with change in temperature. Due to increase in temperature the length of the gauge material will increase resulting in development of strain without application of load. So, there will be differences in the measurements.

b.) Change in resistance - As we know Resistivity of the conductor is directly proportional to the temperature, so with change in temperature resistivity will also change resulting in the change in resistance. Change in resistance is due to the temperature not due to strain, so it is the undesirable changes which can affect the measurements.

Refer below image for some relationship that affect measurements ;

These are the major effects of temperature on gauge. Humidity, surrounding environment too have some effects but they are not so significant.