The static characteristic of a sensor is the relationship between the output and the input of the sensor for a static input signal. Because the input and output quantities and time are irrelevant, so the relationship between them, that is, the static characteristics of the sensor can be used as a time-variable algebraic equations, or to the input as the horizontal coordinates of its corresponding output as the vertical coordinates of the characteristics of the curve drawn to describe.
Characterize the sensor static characteristics of the main parameters are: linearity, sensitivity, hysteresis, repeatability, drift, etc..
1, linearity: refers to the sensor output and input quantities of the actual relationship between the curve deviates from the degree of fitting a straight line. Defined as the full range range of the actual characteristics of the curve and the fitted straight line between the maximum deviation value and the ratio of full-scale output value.
2, sensitivity: sensitivity is an important indicator of the static characteristics of the sensor. It is defined as the increment of the output and the increment of the corresponding input caused by the increment of the ratio. The sensitivity is expressed in terms of S.
3, hysteresis: sensor in the input quantity from small to large (positive stroke) and the input quantity from large to small (anti-stroke) during the change in the input and output characteristics of the curve does not coincide with the phenomenon of hysteresis. For the same size of the input signal, the sensor's positive and negative stroke output signal size is not equal, the difference is called hysteresis difference.
4, repeatability: Repeatability refers to the sensor in the same direction of the input for the full range of continuous multiple changes, the degree of inconsistency in the characteristic curve.
5, drift: sensor drift refers to the input quantity is unchanged, the sensor output changes over time, this phenomenon is called drift. There are two reasons for drift: one is the sensor's own structural parameters; the second is the surrounding environment (such as temperature, humidity, etc.).
6, resolution: when the sensor input from the non-zero value of the slow increase in more than a certain increment after the output of the observable changes, the input increment called sensor resolution, that is, the minimum input increment.
7, threshold: when the sensor's input slowly increases from zero value, after reaching a certain value of the output observable change, this input value is called the sensor's threshold voltage.