It is difficult to determine the exact magnitude of physical forces such as temperature and pressure. Their values can be easily determined by a meter if the forces are converted to an electrical signal. This is the primary function of a transducer; to convert a physical force into an electrical signal so that it can be easily handled and transmitted for measurement.
“A transducer is an electronic device that converts energy from one form to another. The process of converting energy from one form to another is known as transduction.”
Parts of a Transducer
A transducer is made of two important parts:
- Sensing element
- Transduction element
A transducer also possesses other vital parts such as amplifiers, power supplies and signal processing equipment.
Types of Transducer
There are two types of transducer and they are known as:
- Input Transducer
- Output Transducer
An input transducer takes a physical signal and converts it into an electrical signal. A microphone is an example of an input transducer. A microphone converts physical sound waves into an electrical signal that can be transferred through wires.
An output transducer converts electrical signals into other forms of energy. A lamp converts electricity into light and a motor, on the other hand, converts electricity into motion.
What are some applications of Transducer?
Some applications of transducer are as follows:
- A transducer is used in the measurement of loads on the engine.
- A transducer is used in an ultrasound machine.
- A transducer in a speaker converts electrical signals into acoustic sound.
What are the factors to consider while selecting a transducer?
- The output impedance should be low and the input impedance high to avoid loading effect.
- The transducer should be highly sensitive to desired signals.
- A transducer should work in corrosive conditions.
A transducer measures and transmits the physical signal information as coded digital signals rather than continuously varying currents or voltages. Most transducers used in digital systems are primarily analogue in nature and incorporate some form of conversion to provide the digital output. The digital output can be further fabricated by various pulse modulation techniques such as pulse width modulation, pulse amplitude modulation and more.