Accelerometer

The seeming acceleration in turn is the equally effective not gravitational nature of forces which affects weight and carried to the value of the weight. Let's depart from physics and we will pay attention directly to a method of operation of the accelerometer in hard drives. Most actively such devices are used in Apple MacBook notebooks and the iPhone phones. On the basis of this technology numerous games, programs, management systems are constructed. So, there are two approaches of protection of winchesters against external influences  — active and passive. With the last everything is simple.

Producers fill in space between the body and the winchester the structures absorbing blow. Normally it is rubber or gels. But such methods it is impossible to protect winchesters, falling from height more than 1.5 meters. Active methods of protection of HDD can be separated into two options too. First, it is possible to increase volume a disk cache memory (like that all modern models are equipped actually). At the expense of it there is a decrease in number of read operations and record. So, by the way, both energy consumption and heat release decreases. But this method does not save if at the time of blow read operations or records were made and to complete with an add-in memory winchesters expensively.

As a result use of the accelerometer remains the most optimal method today. In case of falling of the notebook or a player the signal is generated, and at the command of the disk head are instantly set to safe position. For the first time such methods it was used by IBM company in notebooks of this brand in 2003. Recently producers instead of two-axial sensors began to mount in the notebooks three-axial under the pretext of bigger security. However as practice and independent experiments shows, such method is no more effective, than in a case with two-axial accelerometers. And the final price will be significantly higher.

Application

Cars

Stabilization systems, along with accelerometers need application of gyroscopes. The mouse of Logitech MX Air who along with accelerometers successfully uses solid-state gyroscopes is known to most of computer users. The common example of application can be considered automobile flight recorders. A main objective of such device  — documentation of the high-speed mode and a trajectory of the movement in seconds which precede collision. Thanks to such office of service traffic police, for example, can get more information of the movement preceding collision. Such device along with the accelerometer cannot do also without piesoceramic gyroscope. Its role is rather simple. During descent from the mountain the driver can brake, observing the high-speed mode, however the accelerometer is affected by attracting force of the earth which will force the device to overestimate actual speed. A problem of a gyroscope  — to enter correction, to consider angular speed that allows to make necessary amendments. The General Motors company completes with such "flight recorders" the cars since 1990. It is possible to purchase such device and separately at the price from $100 up to $200.

In general the range of use of accelerometers in automotive equipment is extremely wide. Everything depends on imagination, and desire of autoindustrialists to implement similar devices in own products. In particular there are signaling options when the accelerometer fixes rise attempt by a car jack. Also the system of suppression of noise is interesting. Accelerometers are capable to reveal low-frequency vibration. The signal is transmitted to a management system, and the same noise in an antiphase is transferred to stereosystem loudspeakers. Such technology meanwhile is in area of the idea as implementation is extremely difficult today. In extremely expensive cars there is a system of alignment, course stability when the accelerometer, being based on the data obtained from the navigator does not allow the car to leave the correct route. They, by the way, are also not effective as they cannot brag of the accuracy and efficiency.

Entertainments

Gyroscopes were a basis for numerous entertainments many centuries. Today on the basis of gyroscopes make children's tops, yo-yo toys and also hand exercise machines. The last, it is necessary to tell, recently purchased wide popularity. The Powerball exercise machine underwent several versions. Today the disk with exercises is applied to like that, and it can be made of expensive materials. Fans even set up on them speed records. Current makes 16553 revolutions per minute. In the world several thousands of patents for inventions which work in the basis so use of gyroscopes in toys is not surprising at all are registered. Use of accelerometers is relevant and not only for protection of carriers. In particular many a communicator are not intended for quick access or management of functions of one hand that is important during the movement or in the car. Many mobile games are constructed based on this function. In particular a game in which it is necessary to pass the sliding ball a labyrinth is popular and not to fall in the openings located on the card.

Sport and health

Some companies making the alpine skiing and snowboard equipment were seriously puzzled with a problem of automatic fastenings. If the unlucky skier falls from the mountain then the probability not only skis to break, but also legs is high. However the accelerometer at strong blow is capable to record unsuccessful movement and without the aid of the user to release fastening of skis. The main objective here  — sale of the inexpensive supply systems capable to work normally at low temperatures. More effective use of accelerometers can be observed in neuromuscular stimulators. The person who after accident or injuries lost capability to control muscles, can have an opportunity to move due to stimulation to certain timepoints. During walking a front part of foot rises at advance, and at the termination of a step falls down. The accelerometer gives a signal of leg provision, and the corresponding muscles are stimulated with electric impulses to manage rise as it is required.

Links

Circuit engineering: electric micromachines