Sensitivity of sensor

Sensitivity refers to the ratio of the output change △y to the input change △x of the sensor under steady-state working conditions. It is the slope of the output-input characteristic curve. If there is a linear relationship between the output and input of the sensor, the sensitivity S is a constant. Otherwise, it will change with the change of the input. The dimension of sensitivity is the ratio of the dimensions of the output and input. For example, for a displacement sensor, when the displacement changes by 1mm, the output voltage changes by 200mV, then its sensitivity should be expressed as 200mV/mm. When the dimensions of the output and input of the sensor are the same, the sensitivity can be understood as the magnification. Improving the sensitivity can obtain higher measurement accuracy. However, the higher the sensitivity, the narrower the measurement range and the worse the stability.

Resolution of sensor

Resolution refers to the ability of the sensor to sense the minimum change of the measured quantity. That is, if the input changes slowly from a non-zero value. When the input change value does not exceed a certain value, the output of the sensor will not change, that is, the sensor cannot distinguish the change of this input. Only when the change of the input exceeds the resolution will its output change. Usually the resolution of the sensor at each point in the full scale range is not the same, so the maximum change in the input value that can cause a step change in the output in the full scale is often used as an indicator to measure the resolution. If the above indicator is expressed as a percentage of the full scale, it is called resolution. The resolution is negatively correlated with the stability of the sensor.