The sensor is a detection device that can sense the measured information and transform the sensed information into electrical signals or other desired forms of information output to meet the transmission, processing, storage and display of information. , recording and control requirements. Nowadays, with the continuous development and progress of the Internet of Things, a wide variety of sensors are increasingly used in various items such as industrial automation, agricultural modernization, aerospace technology, military engineering, robotics, resource development, and oceanography. Detection, environmental monitoring, security, medical diagnosis, transportation, household appliances, etc. In recent years, the global sensor industry has developed rapidly. Sensors have not only entered people's daily work and family life, but have also been widely used in various sectors of national economy and national defense construction, and have made due contributions to China’s modernization. Before the concept of the sensor “emergedâ€, there were actually sensors in the early measuring instruments, but only in the form of a single part of the entire instrument. Therefore, before 1980 in China, the textbook that introduced sensors was called "non-electrical electricity measurement." The appearance of the sensor concept is actually the result of the progressive modularization of measuring instruments. Since then, the sensor has emerged from the entire instrument system and has been independently researched, produced and sold as a functional device. According to the working principle of the sensor, it can be divided into physical sensors and chemical sensors. Physical sensors use physical effects to convert small changes in the measured signal into electrical signals such as piezoelectric effects, magnetostrictive phenomena, ionization, polarization, thermoelectricity, optoelectronics, magnetoelectricity, and other effects. Chemical sensors are based on chemical adsorption, electrochemical reaction and other phenomena as the cause and effect of the sensor. In recent years, biosensors using various biological characteristics have emerged to detect and identify chemical components in living bodies. Strictly speaking, the sensor is not a purely academic direction, because all disciplines have research sensors. The new sensor based on newly discovered physical phenomena and chemical effects is actually a secondary development of other professional basic research results. With the rapid development of electronic circuit technology, more and more measurement problems are concentrated on the sensor. Ultimately, the performance of the sensor determines the performance of the entire measuring instrument. This is the most important driving force for sensor development. Sensors are more powerful for our personal lives. For example, by simply acquiring flowerpot sensors at the doorstep, you can monitor soil moisture, humidity, and nutritional status to manage your own plants at any time. Users can also share the data obtained by these sensors to the network platform to get professional advice. Sensors have become the golden point in the wearable device industry chain and are a field with a strong chance of certainty in the hardware industry chain. Take Google Glass as an example, its built-in as many as more than 10 types of sensors, including gyro sensors, acceleration sensors, magnetic sensors, linear acceleration and other sensor applications, which allows Google Glass to achieve some of the features that traditional terminals can not achieve, such as Users can take photos with just one eye. Although Google did not disclose specific technical details, but industry experts believe that this is mainly because Google Glass built-in infrared sensors and distance sensors, in the organic combination of the two, the user's eye activity is identified, and ultimately to achieve the application of the operation . Compared to the relatively large-scale instrument and equipment, the investment that the sensor needs in the process of productization is generally not very big, so it is more suitable for small business investment. One characteristic of the sensor industry is that the sensor itself has a high technical content, but the price of a single sensor is generally not high. One of the results of this feature is that, despite the high technical added value of the sensor, it is difficult to rely on the sensor to produce a considerable output value. 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