February 10, 2012


What is an accelerometer?

                    An accelerometer is an electromechanical device that will measure acceleration forces. These forces may be static, like the constant force of gravity pulling at your feet, or they could be dynamic - caused by moving or vibrating the accelerometer.

What is accelerometer used for? 

                     By measuring the amount of static acceleration due to gravity, you can find out the angle the device is tilted at with respect to the earth.
                     In the computing world, IBM and Apple have recently started using accelerometers in their laptops to protect hard drives from damage. If you accidentally drop the laptop, the accelerometer detects the sudden free fall, and switches the hard drive off so the heads don't crash on the platters. In a similar fashion, high g accelerometers are the industry standard way of detecting car crashes and deploying airbags at just the right time.

How accelerometer works?
                    You might be thinking that how with pure electronics we can measure tilt of any sensor but that is not true with accelerometer because accelerometer are made with Micro electromechanical system (MEMS). so with movement of accelerometer the micro particles move that create either capacitive change between the plates or voltage difference according to the tilt.  

Types of accelerometer: 

     1) Piezoelectric Accelerometer : 

                                       They contain microscopic crystal structures that get stressed by acceleration forces, which causes a voltage to be generated.

     2)Capacitive accelerometer :

                                     They contain microscopic metallic structures placed near to each other so that any movement between them produce capacitance change



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