Series Opposition Connection of LVDT Secondaries

When two LVDT secondaries are connected in series opposition, the output voltage is the difference between the voltages induced in the two secondary windings. This arrangement provides an output voltage that is proportional to the core displacement.

Explanation:
- In series opposition connection, the output voltages of the two secondary windings are added together in reverse polarity.
- This results in cancellation of the voltages induced by the primary coil, leaving only the difference between the voltages induced in the two secondary windings.
- The series opposition connection helps to increase the sensitivity of the LVDT, as the output voltage is doubled compared to a single secondary connection.
- This configuration also helps in reducing the effect of temperature variations and noise on the output signal.

Advantages of Series Opposition Connection:
- Increased sensitivity: The output voltage is doubled compared to a single secondary connection.
- Improved noise rejection: The arrangement cancels out common-mode noise induced in both secondary windings.
- Better linearity: The series opposition connection helps in achieving a more linear relationship between the core displacement and the output voltage.

In conclusion, connecting two LVDT secondaries in series opposition is a common practice to enhance the sensitivity, noise rejection, and linearity of the LVDT output signal. This configuration is widely used in applications where precise and accurate measurement of displacement is required, such as in aerospace, automotive, and industrial systems.