Using the usual equation for a dc strain-gage bridge, show that if the resistance elements R1 and R2 have the same temperature coefficient of resistance and if R3 and R4 have the same temperature coefficient of resistance, the temperature effects are compensated for up to the first order.
A microminiature (MEMS) strain-gage accelerometer uses two semiconductor strain gages, one integral with the cantilever element near the fixed end (root) and the other mounted at an unstrained location of the accelerometer. The entire unit including the cantilever and the strain gages has a silicon IC construction and measures smaller than 1 mm in size. Outline the operation of the accelerometer. What is the purpose of the second strain gage?