Question

A piezoresistive accelerometer has the following properties and inputs:

Axial acceleration = 75 g’s

Maximum temperature effect on sensitivity = 10%

Sensitivity = 0.4 mV/g

What is the maximum reading of the axial acceleration in mV that the accelerometer may measure?

Answer 1

The axial acceleration is $75g$. The sensitivity is $0.4\text{ mV}/g.$

Thus, the maximum reading of the axial acceleration in mV that the accelerometer may measure without temperature effects on sensitivity is

$$R=75g\cdot0.4\text{ mV}/g=30\text{ mV}.$$

On the other hand, due to temperature effects the measurements can be 10% higher unless the readings are 30 mV. It means that the maximum possible reading of the axial acceleration with temperature effects on sensitivity is

$$R_t=1.1R=33\text{ mV}.$$