23-02-2013, 10:09 AM
SENSORS AND TRANSDUCER
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What is Sensor ?
Transducers:- Transducers is a device that converts one type of physical variable (e.g. velocity, force, pressure, flow rate etc.) into another form.
What is Sensors:-A sensor is transducer that is used to make a measurement of a physical variable of interest.
TYPES OF TRANSDUCERS
1. Analog transducers
2.Digital transducers
Analog transducers provide a continuous analog signal such as electrical voltage or current.
Digital transducers produce a digital output signal, either in the form of a set of parallel status bit or series of pulses that can be counted.
Desirable feature of sensors
1. Accuracy
2. Precision
3. Operating range
4. speed of resonance
5. Calibration
6.Reliability
7. Cost and ease of operation
TACTILE SENSORS
Tactile sensors are devices which indicate contact between themselves and some other solid object.
Tactile sensors are divided in two types:-
1. Touch sensors
2. Force sensors
TOUCH SENSORS
Touch sensors are used to indicate that contact has been made between two objects without regard to the magnitude of the contacting force.
In this category simple devices like Limitswitch, Microswitch.
The simpler devices are frequently used in the design of interlock system in robotics.