As one of the three basic foundations of information technology, sensor technology is currently a high technology that developed countries are competing to develop. It is one of the top ten technologies that have been prioritized for development since the 21st century. Sensor technology involves a wide range of knowledge areas and its research and development are increasingly linked to the development of technology in other disciplines. The article introduced relevant sensor knowledge, reviewed the history of the development of sensor technology, summarized the main research status of high-end leading photoelectric sensor technology and biosensor technology in recent years, and looked forward to the development of modern sensor technology through brief examples. Application prospects. The precise operation of industrial robots depends on the accurate understanding of their own state, operating objects and operating environment. This accurate understanding is achieved through sensory sensory functions. The robot's own state information is obtained through its internal sensors ( position, displacement, velocity, acceleration, etc. ) . The perception of the operating object and the external environment is achieved through an external sensor. This process is very important and is sufficient to provide feedback information for the robot control. CNC machine tool requirements for sensors: (1) High reliability and strong anti-interference; (2) Meet the accuracy and speed requirements; (3) Easy to use and maintain, suitable for machine tool operating environment; (4) Low cost Different kinds of CNC machine tools have different requirements for sensors. In general, large-scale machine tools require high speed response, and medium-sized and high-precision CNC machine tools mainly require precision. Sensor classification and characteristics: The sensor is generally composed of three parts: a sensitive component, a conversion component, and a basic conversion circuit. The sensor can be divided into internal information sensors that detect the internal state of the mechatronic system and external information sensors of the external environmental state of the system according to the objects to be measured. 2. Sensors can be divided into physical and structural types according to the operating mechanism. 3. Sensors can be classified into passive and active types according to energy source classification. 4 According to the nature of the output signal, the sensor can be divided into switch type, analog type and digital type. 5. The characteristics of a sensor mainly refer to the relationship between the output and the input. There are static and dynamic characteristics . The static characteristics of the sensor; when the sensor's input is constant or changes slowly over time, the relationship between the sensor's output and input is called the static characteristic. The dynamic characteristics of the sensor; the response of the sensor output to the input variable over time is called the dynamic characteristics of the sensor.
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