What is meant by passive transducer? Explain any one type of passive transducer used in industries in details
Let us start our discussion with defining a transducer.
A transducer is a device used to convert non-electrical energy to electrical energy. This primarily finds its use in instrumentation and communication engineering. Though, it can be found everywhere, from photocells to potentiometers.
Now, let us define a passive transducer. A passive transducer performs the function of a transducer without any external force.
I will discuss the example of a simple potentiometer. A potentiometer is a very versatile device. its uses are found as a voltage divider, audio control system, television, and the thing of our interest i.e., transducers.
Displacement can be measured by a potentimeter by using its dependence of its resistance on voltage as a key concept.
A potentiometer, being a passive transducer, needs an external power source to work. Let us denote the input power supply as . A long wire is attached to a potentiometer, different points on it indicate different values of resistances. Let D be the total length of the potentiometer.
Now,
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