Sensors have long penetrated into areas such as industrial production, space development, ocean exploration, environmental protection, resource surveys, medical diagnostics, bioengineering, and even cultural relics protection. It is no exaggeration to say that from the vast space, to the vast ocean, to various complex engineering systems, almost every modern project can not be separated from a variety of sensors.
It can be seen that the important role of sensor technology in developing the economy and promoting social progress is very obvious. All countries in the world attach great importance to the development of this field. It is believed that in the near future, sensor technology will have a leap to reach a new level commensurate with its important position.
The characteristics of the sensor include: miniaturization, digitization, intelligence, multi-functionality, systemization, and networking. It not only promotes the transformation and upgrading of traditional industries, but also may establish new industries, thus becoming a new economic growth in the 21st century. point. Miniaturization is based on microelectromechanical systems (MEMS) technology and has been successfully applied to silicon devices as silicon pressure sensors.
The strain gauge in the sensor has a strain effect of the metal, that is, mechanical deformation under the action of an external force, so that the resistance value changes accordingly. There are two types of resistance strain gauges: metal and semiconductor. Metal strain gauges are available in wire, foil and film. Semiconductor strain gauges have the advantages of high sensitivity (usually dozens of times of silk and foil) and small lateral effects.
The static characteristics of the sensor are related to the static input signal, the output of the sensor and the input. Since the input and output are independent of time at this 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 amount is used as the abscissa, and the corresponding output is made. 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.