What is transducer

Definition of transducer:

A transducer is a device that converts the energy from one form to another. Usually, a transducer converts a signal in a form of energy to a signal in another. Some of the transducers is usually more efficient than others, An illustration power into an electromagnetic field. 

Characteristics of the transducer:

One of the main key difference between the sensor and transducer is that the transducer converts the physical quantity or nonelectrical into another signal or electrical signal whereas the sensor senses the physical changes occur in the surrounding.

The characteristics of the transducer are given below that are determined by examining the output response of a transducer to a variety of input signals. The method of computational and standard statistical can be applied to the test data. 
  • Accuracy
  • Noise 
  • Linearity
  • Sensitivity
  • Hysteresis
  • Size
  • Span 
  • Repeatability
  • Conformance
  • Resolution
  • Speed
  • Ruggedness
  • High output
  • High stability
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Different types of transducer:

Classification based on the source of energy: Active and passive transducer 

Classification based on physical quantity: 
  • Pressure transducer - Bourdon gauge
  • Force transducer  - Dynamometer
  • Acceleration transducer  - Accelerometer
The primary and secondary transducer  

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Application of the transducer:

Application of the transducer in a different part of electronics :
  • Thermistor/ Thermocouple
  • Optocoupler
  • LDR
  • Microphone
  • Hall effect
  • Speaker
  • Magnetic pickup
  • Flame or smoke
  • Pizzo
  • Strain gauge
  • Vibration
  • Magnetism
  • Force
  • Torque
  • Power
  • Current
  • Magnetic flux
  • Position 
  • Humidity
  • Displacement
  • Pressure

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Advantages and disadvantages of the electrical transducer:
  • The electrical output of the transducer can be easily used, transmitted and also easily processed for the purpose of measurement.
  • Mass inertia effects are minimized
  • The signal can be conditioned or mixed to obtain any combination with the output of similar transduces or control signals
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