Transducer ppt
- 1. Inductive transducer Inductive Transducers may be either ▫ Self - generating type transducers ▫ Passive type transducers Principle : Self inductance, Mutual inductance change , Eddy current production
- 2. Self inductance Inductance = 𝑁2𝛍 𝐺 G= geometric form factor , G=A/I A-------cross sectional area l--------coil length 𝛍--------Permeability
- 3. Mutual inductance change M= 𝐿1. 𝐿2 Inductance is altered by coupling coefficient Mutual inductance change is adjusted by measurement and displacement Eddy current production Change in distance of coil or plate –measures displacement
- 4. Types 1) Simple inductance type
- 5. 2)Two type mutual inductance
- 6. Advantages Responsivity is high Load effects will be reduced Strong against ecological quantities Disadvantages Operating range reduced by side effects Working temp should be under curie temp Sensitive to magnetic field
- 7. Applications Detection of metals Touch pad Measure position Dynamic motion Missing parts Counting the no: of objects
- 8. Linear Variable Differential Transformer (LVDT)
- 9. Linear Variable Differential Transformer (LVDT)
- 10. when the core is in the center so that V1=V2, there is no voltage output, Vo = 0 V1 > V2 ,Vo increase V2 > V1 ,Vo decrease
- 11. Advantages High sensitivity Excellent repeatability Simple, Easy to maintain Low cost Disadvantages Sensitive to stray magnetic field Temperature affects the performance Inherently low in power output
- 13. Inductive potentiometer Used to measure angular displacement Stator -rotor Synchro-resolver type
- 14. Electromagnetic sensor A moving magnetic field causes an current to flow through conductive material. Sensor measures the induced electrical currents Eg . Hall sensor
- 15. Hall sensor Activated by external magnetic field O/P signal function of magnetic field density Hall voltage VH Hall voltage α strength of magnetic field