Wind pressure sensor
Wind pressure sensor is the most commonly used sensor in industrial practice, also called micro differential pressure sensor, which is widely used in various industrial automation environments, involving boiler air supply, dust removal equipment, water conservancy and hydropower, railway transportation, intelligent building, production automation , Aerospace, military, petrochemical, oil wells, power, ships, machine tools, pipelines and many other industries.
The working principle of the wind pressure sensor The pressure of the wind pressure sensor acts directly on the diaphragm of the sensor, causes the diaphragm to produce a micro displacement proportional to the pressure of the medium, causes the resistance of the sensor to change, and detects this change with the electronic circuit, and The conversion outputs a standard signal that corresponds to this pressure.
Static characteristics of the sensor The static characteristics of the sensor refer to the relationship between the static input signal and the output and input of the sensor. Since both input and output are independent of time, the relationship between them, ie, the static nature of the sensor, can be used as an algebraic equation without a time variable, or as an abscissa with the input, and the output corresponding to it is used as The ordinate shows the characteristic curve. The main parameters that characterize the static characteristics of the sensor are: linearity, sensitivity, hysteresis, repeatability, drift, etc.
(1) Linearity: The degree to which the actual relationship between sensor output and input deviates from the fitted straight line. It is defined as the ratio of the maximum deviation from the full-scale output value between the actual characteristic curve and the fitted line over the full scale range.
(2) Sensitivity: Sensitivity is an important indicator of the sensor's static characteristics. It is defined as the ratio of the increment of the output to the corresponding increment of the input that caused the increment. Use S for sensitivity.
(3) Hysteresis: The phenomenon that the input/output characteristic curve of the sensor does not coincide during the period when the input amount changes from small to large (positive stroke) and the input amount changes from large to small (anti-stroke) becomes hysteresis. For the same size input signal, the sensor's positive and negative stroke output signal size is not equal, this difference is called hysteresis difference.
(4) Repeatability: Repeatability refers to the extent to which the resulting characteristic curve is inconsistent when the sensor makes multiple changes in the full range of the input in the same direction.
(5) Drift: The drift of the sensor means that the output of the sensor changes with time when the input amount is constant, and the phenomenon is called drift. There are two reasons for the drift: one is the sensor's own structural parameters; the other is the surrounding environment (such as temperature, humidity, etc.).