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Sensors The Main Features

Sinocera Piezotronics, INC | Updated: May 26, 2017

  Sensors The sensor is a detection device that can feel the information to be measured and can transform the sensed information into electrical information or other necessary information output according to certain rules to meet the information transmission, processing, storage and display , Recording and control requirements.

  Sensors The characteristics of the sensor include: miniaturization, digital, intelligent, multi-functional, systematic, network. It is to achieve automatic detection and automatic control of the primary link. The presence and development of the sensor, so that objects have a sense of touch, taste and smell and other senses, so that objects gradually become alive. In general, according to its basic sensing function, it is divided into three categories: thermal element, photosensitive element, gas sensor, force sensitive element, magnetic element, humidity sensor, acoustic sensor, radiation sensitive element, color sensor and sensible element. The

  Sensors The sensor is static

The static characteristic of the sensor refers to the relationship between the static input signal, the output of the sensor and the input quantity. Because the input and output are independent of time, so the relationship between them, that is, the static characteristics of the sensor can be used without a time variable algebraic equation, or the amount of input for the abscissa, and its corresponding output Vertical axis and draw the characteristic curve to describe. Characterization of the main parameters of the static characteristics of the sensor are: linearity, sensitivity, hysteresis, repeatability, drift and so on.

Sensors Linearity: refers to the sensor output and the amount of input between the actual curve deviation from the degree of fitting straight line. Is defined as the ratio of the maximum deviation between the actual characteristic curve and the fitting straight line in the full scale range to the full scale output value.

Sensitivity: Sensitivity is an important indicator of the static characteristics of the sensor. It is defined as the ratio of the increment of the output to the corresponding input increment that caused the increment. Use S to indicate sensitivity.

Hysteresis: The phenomenon that the input and output characteristic curves do not coincide during the change of the input quantity from small to large (positive travel) and input from large to small (reverse stroke) becomes hysteresis. For the same size of the input signal, the sensor forward and backward travel output signal size is not equal, the difference is called the hysteresis difference.

Repeatability: Repeatability refers to the sensor in the same amount of input in the same direction for a number of continuous changes, the resulting characteristics of the degree of inconsistency curve.

Drift: The drift of the sensor means that the output of the sensor changes over time in the case of constant input. This phenomenon is called drift. There are two reasons for drift: First, the sensor structure parameters; Second, the surrounding environment (such as temperature, humidity, etc.).

Resolution: When the input of the sensor slowly increases from a nonzero value, an observable change occurs after an increment is exceeded. This input increment is the resolution of the sensor, that is, the minimum input increment.

Threshold: When the input of the sensor starts to increase slowly from zero, an observable change occurs after a certain value is reached. This input value is the threshold voltage of the sensor.