In order to get information from the outside world, people must resort to sensory organs. However, it is far from enough to rely on people's own sensory organs in the study of natural phenomena and laws as well as production activities. To accommodate this, sensors are needed. Therefore, it can be said that the sensor is an extension of the human five senses, also known as the electrical five senses.

With the advent of the new technological revolution, the world began to enter the information age. In the process of using information, the first thing to be solved is to obtain accurate and reliable information, and sensor is the main way and means to obtain information in the field of nature and production.

Sensors in modern industrial production, especially in the automated production process, to use a variety of sensors to monitor and control the production process of each parameter, so that the equipment work in the normal or the best state, and make the best quality products. Therefore, it can be said that without many excellent sensors, modern production has lost its foundation.

In the basic subject research, the sensor has the outstanding position. The development of modern science and technology has entered many new fields, such as observing the vast universe of thousands of light years on the macro level, observing the particle world as small as cm on the micro level, observing the evolution of celestial bodies as long as hundreds of thousands of years on the longitudinal level, and the instantaneous reactions as short as S on the short level. In addition, extreme technology studies have emerged that have an important role to be played in deepening material knowledge and developing new energy and materials, such as ultra-high temperature, ultra-low temperature, ultra-high pressure, ultra-high vacuum, ultra-high magnetic field, ultra-weak magnetic field, etc. Obviously, it is impossible to obtain a large amount of information that is not directly accessible to human senses without appropriate sensors. Many obstacles in basic scientific research lie in the difficulty in acquiring object information, and the emergence of some new mechanisms and highly sensitive detection sensors often leads to breakthroughs in this field. The development of some sensors is often the forerunner of the development of some marginal disciplines.

Sensors have already penetrated into extremely extensive fields such as industrial production, space exploration, ocean exploration, environmental protection, resource investigation, medical diagnosis, bioengineering, and even conservation of cultural relics. It is no exaggeration to say that, from the vast space, to the vast ocean, to various complex engineering systems, almost every modern project, is inseparable from a variety of sensors.

It can be seen that sensor technology plays an important role in developing economy and promoting social progress. Countries all over the world attach great importance to the development of this field. It is believed that in the near future, sensor technology will make a leap to a new level commensurate with its important status.