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Linear Variable Differential Transformer (LVDT)

Linear Variable Differential Transformer (LVDT). Will Bane CEE 398. Outline. Introduction Design Benefits and Limitations Applications. Introduction. Cheap, easy to use way of measuring deflection Measure deflections from 12 in. to millimeters. Description.

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Linear Variable Differential Transformer (LVDT)

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  1. Linear Variable Differential Transformer(LVDT) Will Bane CEE 398

  2. Outline • Introduction • Design • Benefits and Limitations • Applications

  3. Introduction • Cheap, easy to use way of measuring deflection • Measure deflections from 12 in. to millimeters

  4. Description • An LVDT consists of a coil structure shaped into a cylinder and a magnetic core • Coil structure consists of one primary core and two secondary cores

  5. Description • When core slides through transformer, a certain number of coils are affected • This generates a unique voltage

  6. Interpretation • Voltage can be interpreted using formula stated above • V = Voltage and N = Number of coils

  7. Mounting • Core attached to a stationary object • E.g. Testing frame • Rod attached to the object to be displacing • E.g. Mid-span of girder • Object moves and thus changes the position of rod in core

  8. Benefits • Easy way to measure deflection • Very rugged piece of equipment • Ideally a frictionless surface • Expected life is 2,000,000 hours • Can be used in adverse environmental conditions • Relatively cheap • $50 to $1600

  9. Limitation • The range of measurement is limited • ~12 in. • For longer stroke, a cable extension transducer is preferable ~ 1700 in. • Rod attached to magnetic core can be bent • Exact distance is no longer known • Requires alignment to be correct

  10. Applications • Displacements • extensometers, temperature transducers, butterfly valve control, servo valve displacement sensing • Deflections • Measurements of thickness changes • Fluid level (float attached to rod) • Velocity and acceleration

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