#WishIknew – What’s the difference between an accelerometer and a proximity sensor?

Vibration

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I wish I knew the difference between an accelerometer and a proximity sensor!

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Accelerometer

Proximity sensor

Definition

A device that measures acceleration, both static and dynamic. Static usually refers to a force like gravity. And dynamic means movements like tilting or turning your phone. A device that can detect a variety of nearby objects without coming in contact with them. It often uses electromagnetic radiation.

Purpose

Safety and convenience. For example, in cars, they activate airbags in crashes. And in laptops, they protect hard drives from damage if they fall. Also safety and convenience.On your car, they’ll keep you from hitting the curb or a bystander.And on your phone, these will turn your touchscreen off if you hold it to your ear.Plus, in industry, they can keep separate parts from clashing.

Mechanism

The two most popular are piezoelectric and capacitive.
The first has teeny crystals that react to acceleration, and this reaction creates a voltage. So the device interprets that voltage to figure out velocity and orientation.The second can sense static (like gravity) and dynamic (like human movement) acceleration. So a change in force will change its capacitance. Then the device can translate that into voltage.
An inductive proximity sensor has an oscillator that creates a fixed wave to drive a coil. Then the coil uses a ferrite core to create an electromagnetic field. So an object that breaks this field reduces the voltage and triggers a signal to activate.

Applications

You can monitor vibration in machines and buildings or acceleration in vehicles.And in biological sciences, you can track animal behavior.They’re also used to guide inertial navigation systems and monitor active volcanoes. You know they guide cars in parking and alert pilots to ground proximity in flight. You’ve also seen them activating automatic sinks.
But did you know they monitor camshafts in some engines? And they detect vibration of rotating shafts in heavy machinery too.

 

Related tags: #WishIknew Accelerometer Basic devices English Measurements Principle Proximity sensor Vibration
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