Consider the following actions:Detection of car crash/collision which results in the deployment of a

Question

Consider the following actions:Detection of car crash/collision which results in the deployment of airbags almost instantaneouslyDetection of accidental free fall of a laptop towards the ground which results in the immediate turning off of the hard driveDetection of the tilt of the smartphone which results in the rotation of display between portrait and landscape modeIn how many of the above actions is the function of accelerometer required?

Accepted Answer

An accelerometer is a device that measures the vibration, or acceleration of motion of a structure. Accelerometer sensors have the ability to alter obtained physical acceleration from motion or gravity into a voltage output.Key applications of accelerometer include:Vehicles: The invention of airbags have saved millions of lives over the years. Accelerometers are used to trigger the airbags as the sensor would send a signal when it experiences a sudden shock. In the event of a crash, the crash sensor (an accelerometer) sends a signal to the airbag control unit. This control unit triggers the inflation device, which generates nitrogen gas by igniting a mixture of sodium azide (NaN3) and potassium nitrate (KNO3). Hence, statement 1 and statement 2 are correct.Rotating Machinery: Accelerometers used in rotating machines detect undulating vibrations. Electronic devices these days (including smartphones, tablets and even laptops) have a sense of gravity designed into it and can therefore tell up from down by using an accelerometer. Hence, statement 3 is correct.Hence option (c) is the correct answer.