Transducer vs Inverse Transducer | -Convert Physical to Electrical

One of the primary differences between a transducer and an inverse transducer is that a transducer converts a non-electrical quantity into an electrical quantity, whereas an inverse transducer converts an electrical quantity into a non-electrical quantity. Other differences between the two are summarized in the comparison chart below.

The control of physical quantities such as flow, rate, position, speed, temperature, and pressure depends on the accurate measurement of these quantities. In simple terms, effective control is only possible when these physical parameters are precisely measured.

To measure physical quantities, it is essential to convert them into electrical signals, which is accomplished using a transducer. For example, in a servomechanism, the position of a shaft is controlled by accurately measuring its position.

Comparison Chart

Definition of Transducer

A transducer is a device that converts physical quantities—such as pressure, brightness, and displacement—into electrical signals. This conversion process is known as transduction.

Examples: A thermocouple converts temperature into a small voltage, and an LVDT (Linear Variable Differential Transformer) is used to measure displacement.

Definition of Inverse Transducer

An inverse transducer converts an electrical quantity into a non-electrical quantity. In other words, it functions as an actuator with an electrical input and a non-electrical output.

Examples: Analog ammeters and voltmeters convert current or voltage into mechanical displacement. An oscilloscope converts electrical signals into visible physical deflection on a screen.

Key Differences Between Transducer and Inverse Transducer

• A transducer converts a non-electrical quantity into an electrical quantity, while an inverse transducer converts an electrical quantity into a non-electrical quantity.

• The input to a transducer is a non-electrical quantity, whereas the input to an inverse transducer is an electrical quantity.

• The output of a transducer is an electrical quantity, while the output of an inverse transducer is a non-electrical quantity.

• Examples of transducers include photoconductive cells, thermocouples, and pressure sensors. Examples of inverse transducers include piezoelectric actuators and current-carrying conductors placed in a magnetic field.

Conclusion

A transducer converts a physical quantity into an electrical quantity, whereas an inverse transducer converts an electrical quantity into a physical quantity.