Sensor Sensitivity And Resolution

- Nov 15, 2017-

Sensitivity of the sensor

Sensitivity refers to the sensor output changes in the steady-state work situation △ y changes in the input △ x ratio. It is the slope of the output-input characteristic. Sensitivity S is a constant if there is a linear relationship between sensor output and input. Otherwise, it will change with the amount of input. Sensitivity of the dimension is the output, the input dimension of the ratio. For example, a displacement sensor with a 1 mm displacement change in output voltage of 200 mV should have a sensitivity of 200 mV / mm. When the sensor output, the same amount of input, the sensitivity can be understood as magnification. Increase the sensitivity, you can get a higher measurement accuracy. However, the higher the sensitivity, the narrower the measurement range and the poorer the stability.

Sensor resolution

Resolution is the ability of the sensor to experience the smallest change in measurement. That is, if the input varies slowly from some non-zero value. When the input change does not exceed a certain value, the output of the sensor does not change, that is, the sensor can not tell the change of the input. Only when the input changes beyond the resolution, its output will change. Generally, the resolution of each point of the sensor is not the same within the full scale range. Therefore, the maximum change value among the input quantities capable of making a step change in the output in the full range is generally used as an index for measuring the resolution. The above indicators, if expressed as a percentage of full scale, are referred to as resolution. Resolution and the stability of the sensor has a negative correlation.