Resistive transducer
Resistance of an electrical conductor is given by,
R=ρl/A
Where ,
R = Resistance in ‘Ω’
Ρ = Resistivity of the conductor (Ω - cm)
l = Length of the conductor in cm.
A = Cross-sectional area of the metal conductor in cm2
It is clear from the equation (1) that, the electrical resistance can be varied by varying,
(i) Length
(ii) Cross-sectional area and
(iii) Resistivity or combination of these.
Principle:-
A change in resistance of a circuit due to the displacement of an object is the
measure of displacement of that object ,method of changing the resistance and the resulting devices are summarized in the following
Method of changing resistance-
Length - Resistance can be changed varying the length of the conductor,(linear and rotary).
Dimensions - When a metal conductor is subjected to mechanical strain, change in dimensions of the conductor occurs, that changes the resistance of the conductor.
Resistivity -
When a metal conductor is subjected to a change in temperature and change in resistivity occurs which changes resistance of the conductor.
Resulting device:-
Resistance potentiometers or sliding contact devices displacements
Electrical resistance strain gauges.Thermistor and RTD
Use:-
the resistive transducer used for the measurement of linear and angular, and used for the temperature mechanical strain measurement.
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