At 7:20 this morning, I took China Eastern Airlines from Xi'an to Wuhan to visit the sensor tycoon. I returned to Xi'an by high-speed rail at nearly 18:00 in the afternoon.
    Looking out of the window at the red sunset, with the speeding high-speed railway, when shooting with a mobile phone, the round sun has become an oval, through the glass window, can no longer experience a trace of light and heat, can only imagine that he is the source of the warm world, as a sensor, can not help but imagine what kind of sensor can measure the temperature inside the sun!

     In the early morning, the sun rises slowly from the east, warms the black land of the northeast, shines on the vast North China Plain, reflects the gravel of the western Gobi, seems to draw a big circle over the motherland, and then quietly hides behind the Kunlun Mountains.
     In early spring, ducks predict the temperature of spring, lotus brings the smell of summer, fiery persimmons depict the autumn, crystal cedar highlights the reality of deep winter, spring, summer, autumn and winter, seems to be in the rectangular reincarnation.

     My friend, have you ever thought, if there is no temperature sensor, how can you know whether it is cold or warm? How to feel the alternation of day and night and spring, summer, autumn and winter? If there is no air pressure sensor, how can you feel the tightness on a cloudy day and the clearness of a sunny day? Without a humidity sensor, how can you sense the coldness that is common in the south and the consistent dryness in the north?
    My friend, you know that the earliest sensor in the world, the vibration sensor, is the "seismograph" invented by Zhang Heng in the Eastern Han Dynasty; he is thousands of years earlier than the mercury thermometer invented by the Italians in the 19th century; you know that the real sensor with electrical signal output is the strain gauge technology invented by Americans in the 1930s. You should know that the very popular mems technology sensor originated in the United States in the 1960s; at present, the widely popular and widely used camera, that is, the image sensor, was not actually used in the world until the end of the last century. How early and how slow the development of sensing technology is!

     Friends, whether you know it or not, sensors have been widely infiltrated into our daily life. COVID-19 's epidemic situation makes people understand the infrared temperature sensor as a non-contact temperature gun; isolation at home makes us understand the magnetic sensor as an "electronic seal"; the tight demand of the ventilator makes us understand the pressure sensor; the household sensor unwittingly surrounds us, the air pressure sensor of the electronic sphygmomanometer; the ntc temperature sensor of the electronic thermometer; and the gas sensor of the gas leakage alarm.
    Smoke sensors to prevent fire; temperature and humidity sensors for household comfort; vibration or acoustic sensors for street lamps in corridors; light sensors for curtains; soil temperature and humidity sensors for intelligent flower cultivation. These have been hidden from time to time in the teaching materials of our middle school.

    As the perceptual basis of the intelligent society, smartphones have been embedded with more than a dozen sensors, accelerometers for playing games, vibration or accelerometers for pedometer, light sensors for measuring blood oxygen, and GPS or IMU sensors for positioning. A fall sensor for sensing the fall state of the elderly and an accelerometer for bedridden condition. The "body networking" proposed by foreign countries will have more sensors all over our bodies.

     Cars have become the necessities of our life. Cars are becoming more and more expensive. Do you know where the price is? The main reason lies in the use of a large number of sensors and control systems, ordinary vehicles also have more than 20 kinds of sensors, luxury vehicles have more than 100 sensors.
    The speed sensor measures the speed of the vehicle; the oil level sensor measures the amount of oil; the pressure sensor measures the oil pressure / fuel pressure; the wheel speed sensor and inertia sensor of four wheels are integrated to form ESP to ensure the stable operation of the vehicle; Pm2.5, oxygen sensor, temperature and humidity sensor are used to ensure the comfort of the cabin; tire pressure sensor ensures the stability of tire pressure.
    Acceleration sensor or magnetic sensor to ensure the reliability of airbags; light sensor to control automatic wiper; ultrasonic distance sensor to ensure the safety of reversing. The pressure sensor of the new energy vehicle decreases, but the temperature sensor increases. For example, the thermal stability of the battery. Autopilot also adds millimeter wave sensor ranging or image ranging, and at the same time, it is necessary to set up certain road sensors for coordination. You may only know the functions or phenomena, but not the indispensable role of the sensor in it.
     My friend, you may know that all kinds of sensors have been widely used in the fields of technology and industry. Mars exploration, lunar exploration, man-made satellites and space experimental modules should have inertial sensors (accelerometers and gyroscopes) as the guarantee of flight process. A large aircraft will have 2, 000 to 3, 000 sensors, ensuring its flight safety and comfort; a high-speed train will have hundreds of sensors in operation; a large cruise ship will have nearly 10, 000 sensors installed in various positions; a 50-story building will have more than 2000 sensors, distributed in every corner, if the degree of intelligence is high, the number of sensors will double. A large hydropower station, including concrete, will have about 1000 sensors; the future development of mankind will be the world of sensors and artificial intelligence computing.

    My friend, seeing so many applications now, do you think the development of sensors has come to an end? On the contrary, we have just ushered in the early spring of sensors. Some people say that there are more than 30,000 kinds of sensors in the world. In fact, the development of sensors will be unlimited, and the application of sensors will be difficult to describe in words. The world looks forward to the brilliance of more sensor technology, and human beings look forward to the application of sensors to bring more comfortable, safer, more efficient and more environmentally friendly life and production.
    Friends, let us hope that the development and application of brainwave sensors will bring unlimited imagination to smart homes and smart factories; the application of biosensors will subvert our current imagination; the extreme application of optical sensors will solve many of our problems; the improvement of the sensitivity of magnetic sensors will explain a lot of our confusion. Quantum technology and graphene materials apply and optimize our traditional sensor principles, which will improve the function and accuracy of existing sensors by an order of magnitude.

     Friends, if we can imagine the development and application of sensor technology now, then sensor technology may have come to an end.
    In the 1980s, the rapid development of computers superimposed the rapid influx of communication technology in the 1990s, which has shown us the subversive application of the Internet, which is unthinkable for our post-50s and post-70s contemporary people at that time. The accelerated progress of sensing technology, combined with the comprehensive application of the Internet, what we call the "Internet of things" will change the social form of our future world. 20 years later, we will feel a different world.
    Friends, we praise sensor technology, especially original technology and subversive technology, praise the application of sensors, pay attention to all the people who fight in the sensor field all over the world, salute them!