If we consider the accelerometer, that this will becomeit is clear when its scope will be determined. It covers laptops, mobile phones, a variety of gaming devices, as well as cars. The very purpose of this device is to measure the apparent acceleration.
Accelerometer sensor in mobile phoneused for a variety of purposes. For example, to change the orientation of the screen. Or when performing certain functions when shaking the device. Do not forget about the games, because now they take over the main scope of accelerometers. These sensors are available in a variety of game console controllers, and they are used in the virtual reality helmet from Sony. If we consider the accelerometer that it is, then it is worth mentioning its special value in laptops, more precisely in the hard drives installed there. Everyone knows about the extreme fragility of hard drives, and in the case of laptops the probability of damage becomes several times higher. When the laptop drops, the accelerometer detects a sudden change in acceleration, and then gives the command to park the hard drive head, which helps to prevent not only damage to the device, but also data loss.
Аналогичный принцип используется в автомобильном DVR. At the moments of sudden braking, rebuilding and acceleration of the vehicle, a special marker remains on the video that protects it from being erased and overwritten, making it much easier to analyze the accident in the future. If we consider the accelerometer, what it is and where it is used, it is worth saying that the most promising market for these devices is the automotive one. In gaming consoles and mobile phones, it is used exclusively for entertainment purposes, but in automobiles all security systems are based on their work. Accelerometer sensor provides the deployment of airbags, ABS, adaptive cruise control, stabilization systems, adaptive suspension and other important systems. If we consider that the attention of car manufacturers at the moment is most of all directed towards ensuring security, then the accelerometers will be used more and more.
While the framework for using accelerometersdefined quite clearly, the developers are still thinking about the purposes for which these devices are applicable. For example, it was proposed to use an accelerometer in a smartphone as an earthquake sensor. What it will become clear if we consider the device in more detail. As a result of the experiments, it became clear that the accelerometer can detect strong shocks of more than five balls on the Richter scale, but it should be located near the epicenter of the earthquake. Of course, such a result can hardly be called impressive, but scientists are convinced that the accuracy of devices will only increase over time, which will allow them to determine in the future earthquakes of lesser force.
In connection with all that has been said before, onlyOne question is: Why should a telephone accelerometer measure the force of shocks if an earthquake sensor already exists? Scientists decided to create a network of smartphones in seismically active areas in the future. The theory is that all signals from these devices will flow to an analytical center during an earthquake, so that it will be possible to identify the areas most affected by the disaster in order to coordinate rescue operations more effectively. The idea is not just very interesting, but rather in demand in some parts of the world, but it is still difficult to imagine its implementation in practice.
If we consider the accelerometer, that this will becomeclear after studying its design. Depending on the architecture at the moment there are several types of devices. The operation of the accelerometer may well be based on the capacitor principle. In such a system, the movable part is made in the form of an ordinary weight shifted depending on which direction the device is tilted. As it shifts, there is a change in the capacitance of the capacitor, and more specifically, the voltage. These data allow us to obtain the displacement of the sinker, and with it the desired acceleration. This is exactly how an accelerometer gyro works.
Наиболее распространенным типом являются piezoelectric systems. They are based on a weight, acting under pressure on the piezocrystal. In response, it produces an electric current, so that you can calculate the desired acceleration, if you know the parameters of the entire system.
Accelerometers are presented in another embodiment,which is fundamentally different from those described above. They are called thermal. Their architecture provides for the use of an air bubble. Acceleration leads to its deviation from the initial position, which is fixed by special sensors. The magnitude of the acceleration can be calculated if you know how much the air bubble has shifted during movement.
In the tablet and smartphone, this sensor is usedmost often for the reaction of the device to turn and other manipulations. This allows the screen to rotate too. In games, accelerometers are also used very actively, because the control in this case is carried out by tilting a smartphone or tablet.
