Transducer vs Sensor
Transducer Vs Sensor : Difference between sensor and Transducer
Transducers are devices that convert energy in the form of light, sound, heat, etc., into an equivalent
electrical signal, or vice versa.
Transducers may be used as both inputs to electronic circuits and outputs from them. (Example: Loudspeaker Microphone)
A sensor is a special kind of transducer which is used to generate an input signal to a measurement, instrumentation or control system.
The signal produced by a sensor is an electrical analogy of a physical quantity, such as temperature, distance, velocity, acceleration, pressure, light level, etc.
The signals returned from a sensor, along with control inputs from the user or controller (as appropriate) will subsequently be used to determine the output from the system.
Number of factors like accuracy, resolution, cost, and physical size has to be considered while choosing the sensor for particular application.
Sensors can be generally classified as
- Active Sensor
An active sensor generates a current or voltage output.
- Passive Sensor
A passive transducer requires a source of current or voltage and it modifies this in some way (e.g. by virtue of a change in the sensor’s resistance). The result may still be a voltage or current but it is not generated by the sensor on its own.
Sensors can also be classified as
- Digital Sensor
The output of a digital sensor can exist in only two discrete states, either ‘on’ or ‘off’, ‘low’ or ‘high’, ‘logic 1’ or ‘logic 0’, etc.
- Analog Sensor.
The output of an analogue sensor can take any one of an infinite number of voltage or current levels. It is thus said to be continuously variable.
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