Transducers

Basically, Transducer converts one form of energy into another form of energy. The transducer, which converts non-electrical form of energy into electrical form of energy is known as electrical transducer. The block diagram of electrical transducer is shown in below figure.

As shown in the figure, electrical transducer will produce an output, which has electrical energy. The output of electrical transducer is equivalent to the input, which has non-electrical energy.

Types of Electrical Transducers

Mainly, the electrical transducers can be classified into the following two types.

• Active Transducers
• Passive Transducers

Now, let us discuss about these two types of transducers briefly.

Active Transducers

The transducer, which can produce one of the electrical quantities such as voltage and current is known as active transducer. It is also called self-generating transducer, since it doesn’t require any external power supply.

The block diagram of active transducer is shown in below figure.

As shown in the figure, active transducer will produce an electrical quantity (or signal), which is equivalent to the non-electrical input quantity (or signal).

Examples

Following are the examples of active transducers.

• Piezo Electric Transducer
• Photo Electric Transducer
• Thermo Electric Transducer

We will discuss about these active transducers in next chapter.

Passive Transducers

The transducer, which can’t produce the electrical quantities such as voltage and current is known as passive transducer. But, it produces the variation in one of passive elements like resistor (R), inductor (L) and capacitor (C). Passive transducer requires external power supply.

The block diagram of passive transducer is shown in below figure.

As shown in the figure, passive transducer will produce variation in the passive element in accordance with the variation in the non-electrical input quantity (or signal).

Examples

Following are the examples of passive transducers.

• Resistive Transducer
• Inductive Transducer
• Capacitive Transducer

We will discuss about these passive transducers in later chapters.