Linear Potentiometer Position Sensor: How Does it Work?

position sensors

position sensorsLinear potentiometer position sensors have been in existence for a long time. It is one of the most commonly used instruments to control electrical devices such as volume controls on audio equipment. These are generally inexpensive, simple to use, compact and are also widely available.

To learn more about these devices, here’s a brief discussion from spectrasymbol:

Different Types Available

There are many kinds of such instruments available, which vary in terms of the costs, resolutions, stroke, reliability and environmental resistance. It is necessary to understand the differences between these sensing technologies before you decide on the best one suitable for your needs. They mostly differ in terms of performance and pricing. The other kinds are encoders, magnetostrictive and LVDTs.

Why They’re Popular

Laser trimmed varieties of potentiometers are known to offer very high level of accuracy in terms of measurements. Compared to other complex and not very compact counterparts, these are very durable and the parts rarely turn obsolete. They are also inexpensive, making them the best choice for many applications.

How They Work

The transducer is placed and fixed in a particular position. There is an extended wire rope attached to a mobile object. When a movement occurs, the wire rope goes into action. It rotates a capstan, which is present internally. The sensing device detects this movement and produces appropriate electrical signal outputs. This output clearly indicates the extent of movement by the wire rope and also the velocity of that particular movement. There is a torsion spring inside that maintains the tension of the wire rope. This also serves as a vital component for the retraction mechanism.

There are devices today that can detect movements every few seconds, too. It is only a matter of time before better models of this particular device become developed and available in the market place.

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