The static characteristics of the sensor are related to the static input signal, the output of the sensor and the input. Because the input and output are independent of time, the relationship between them, that is, the static characteristics of the sensor, can be an algebraic equation without a time variable, or the input can be used as the abscissa, and the corresponding output is The characteristic curve drawn on the ordinate is used to describe. The main parameters that characterize the static characteristics of the sensor are: linearity, sensitivity, hysteresis, repeatability, drift, and so on.
Linearity: refers to the degree to which the actual relationship between the sensor output and the input deviates from the fitted line. Defined as the ratio of the maximum deviation between the actual characteristic curve and the fitted line to the full-scale output value over the full scale range.
Sensitivity: Sensitivity is an important indicator of the static characteristics of a sensor. It is defined as the ratio of the increment of the output to the corresponding increment of the input that caused the increment. The sensitivity is indicated by S.
Hysteresis: The phenomenon that the input/output characteristic curves do not coincide during the change of the input amount from small to large (positive stroke) and the input amount changes from large to small (reverse stroke) becomes hysteresis. For input signals of the same size, the sensor's forward and reverse stroke output signals are not equal in magnitude. This difference is called the hysteresis difference.
Repeatability: Repeatability refers to the degree to which the obtained characteristic curve is inconsistent when the input quantity changes continuously in the same direction in the same direction.
Drift: The drift of the sensor means that the sensor output changes with time when the input amount is constant. This phenomenon is called drift. There are two reasons for drift: one is the sensor's own structural parameters; the other is the surrounding environment (such as temperature, humidity, etc.).
Resolution: When the input of the sensor increases slowly from a non-zero value, the output undergoes an observable change after a certain increment. This input increment is called the resolution of the sensor, ie the minimum input increment.
Threshold: When the input of the sensor slowly increases from zero, the output undergoes an observable change after reaching a certain value. This input value is called the threshold voltage of the sensor.