18-09-2014, 02:26 PM
TRANSDUCER
TRANSDUCER.pptx (Size: 1.23 MB / Downloads: 20)
TRANSDUCERS:
Transducer is a device which converts a physical quantity to be measured into an equivalent electrical signal.
In other word it is a device that is capable of converting the physical quantity into a proportional electrical quantity such as voltage or current
Characteristics of Transducers
Linearity – The relation between the output and input of a transducer should be linear.
Accuracy- It is defined as closeness of the actual output produced by transducer to the ideal or true value of the quantity measured.
Speed of response- It show how quickly a transducer responds to the change in the quality being measured.
Sensitivity- The output produced per unit change in the input quantity being measured.
Small Size- A transducer must have small size, proper shape and minimum volume .
Ruggedness- It is ability of transducer to withstand overloads.
STRAIN GAUGE:
The strain gauge is a passive, resistive transducer which converts the mechanical elongation and compression into a resistance change.
This change in resistance takes place due to variation in length and cross sectional area of the gauge wire, when an external force acts on it.
THERMOCOUPLES:
When a pair of dissimilar metals are joined at one end, and there is a temperature difference between the joined ends and the open ends, thermal emf is generated, which can be measured in the open ends.
This forms the basis of thermocouples.
APPLICATION:
Application area of Transducer-
In industry for measurement of pressure, temperature measurement of furnace, displacement measurement etc.
In bio-medical area for temperature measurement.
For LAB experiments