In order to get information from the outside world, people must use the sensory organs.

However, the function of people's own sensory organs in the study of natural phenomena and

laws and production activities is far from enough. To adapt to this, sensors are needed. Therefore,

it can be said that the sensor is an extension of the human features, also known as the electric features.

        With the advent of the new technological revolution, the world begins 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 the sensor is the main way and means to obtain information in the natural and

production fields.

        In modern industrial production, especially in the automated production process, various sensors

should be used to monitor and control the various parameters in the production process, so that the

equipment works in the normal state or the best state, and the product can achieve the best quality.

Therefore, it can be said that without many excellent sensors, modern production will lose its foundation.

        In the basic subject research, the sensor has a more prominent position. The development of modern

science and technology has entered many new areas: for example, to observe the vast universe of thousands

of light-years on the macro, to observe the particle world as small as fm on the micro, to observe the

evolution of celestial bodies for hundreds of thousands of years on the vertical, as short as the instante

reaction of s. In addition, there has also been a variety of extreme technology research that has an important

role in deepening material understanding, exploring new energy and new materials, such as ultra-high

temperature, ultra-low temperature, ultra-high pressure, ultra-high vacuum, ultra-strong magnetic field,

ultra-weak magnetic field and so on. Obviously, it is not possible to obtain a large amount of information

that is not directly accessible to human senses without appropriate sensors. Many basic scientific research

obstacles, first of all, is the difficulty in obtaining object information, and the emergence of some new

mechanisms and high-sensitivity detection sensors often lead to breakthroughs in this field. The development

of some sensors is often a precursor to the development of some fringe disciplines