Do you know the mechanical principle behind this watch?
First we need to know how the pedometer knows how many steps we have taken.
Today, everyone is very concerned about health. And exercise is the most important means of health. Whether it is going out wearing a bracelet, a pedometer, or taking a mobile phone, it is already a lot of people's habits to record the number of steps they walk. However, how does the pedometer work? How do you know how many steps we take each day?
Step Artifact: Rebs Millet Bracelet 2
Liao Yong, an engineer at the China Electronics Academy: "The first pedometer was mechanical. The principle is very simple, just like a pendulum. Because when people walk, they will carry the pendulum with it. It is basically a step taken by a person, then a pendulum is moved, and when the metal is energized, it takes a step."
It turns out that the pedometer relies on the contact of the pendulum with the metal to record our steps. But is the current smart wristband and the step counter software in the mobile phone also the principle?
Liao Yong, an engineer at the China Electronics Academy: "In the current mobile phone bracelet, it usually uses a very small chip called a three-axis accelerometer. This sensor can measure the phone or the bracelet in three different directions. The acceleration is then calculated by the value of this acceleration, and then the statistics can be used to know the number of steps that can be measured."
So how does this sensor know the number of steps we walk?
Liao Yong, an engineer at the China Academy of Electronics Science: "There is a special material called piezoelectric ceramic material. According to the force acting on the top, different deformations can be generated, and different voltage changes can be generated. The force is used to measure the acceleration, and then the acceleration can determine in which direction the person is moving, or how much the frequency is.
However, if you shake your phone by hand, it will also produce acceleration. How does this sensor distinguish the difference between hand and walk?
Liao Yong, an engineer at the China Electronics Academy: "When people walk, the frequency must be within a certain range, for example, how many steps are taken in one second, or how far a minute can go. If the human hand When you hold the mobile phone, the frequency of the first sway will be very fast. When the second one is holding the mobile phone, the acceleration change is much larger than the acceleration change of the person walking. Basically through these two On the other hand, it can be judged whether a person is holding a mobile phone, or is a real person walking."
In fact, the step counting function is only a part of the application of the acceleration sensor. Acceleration sensors play a very important role in vehicle safety and bridge health.
Liao Yong, an engineer at the China Electronics Academy: "Why does the airbag on the car bounce, the car drives above a certain speed and then suddenly stops, the airbag will pop up, actually there is an acceleration sensor in the measuring car. Negative acceleration in the direction of advancement, or sudden change from a very fast speed, a change in quantity, to judge whether the airbag should be ejected now.
Another area where accelerometers can be applied is some healthy monitoring of bridges. Because bridges seem to be hard, there are actually some deformations that can change somewhat, but each bridge cannot change at a certain frequency. This vibration occurs because if it produces resonance with the natural frequency of the bridge, it will have an impact on the structural health of the bridge.
Therefore, it is possible to set some acceleration sensors on the bridge floor to measure the vibration of the bridge, and then to determine whether the vibration is within the allowable range. â€
Sensor technology and computer technology, communication technology and called the three pillars of modern information technology. On the space launch vehicle, more than 2,000 sensors are used; there are thousands of sensors used in a passenger airliner. It can be said that any automatic control device and system are inseparable from sensor technology.
Presumably friends should have mastered the course "Sensor and Detection Technology" at the university level. It is an important professional course for engineering electrical information majors. It is a practical science for researching sensors and detection technology. It plays an important role in modern detection and control systems. The role.
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