Displacement Transducers Flashcards
What does displacement change the value of
Resistance, capacitance or inductance
What is the equation for responsivity of linear electrical transducer
r= vs/l max
Vs is output
L max is displacement
What are resistive types used for
Low precision applications
What are problems with resistive types
Contact mechanisms like friction
What are capacitive types
Capacitance of parallel plate capacitor
What is the equation relating to the capacitive type
C = EEoA/ d
Eo = permittivity of free space
8.85x10^-12 Fm^-1
What is the variable separation capacitive displacement transducer
Plates excited in anti-phase, when movable plate is central there is no net voltage induced on it
What is the responsivity equation for variable separation capacitive
r = Vs/2d
What is a linear variable differential transformer
A transformer in which coupling between the primary and split secondary coils depends on the position of the plunger
What is the output of the linear variable dt when the plunger is central
Zero
What is responsivity for a perfect coupling in linear variable dt
r = Vs/l
L is the range available from 1mm up to 200mm
