Phase difference at excitation frequency - Metrology & Quality Control

Q.  What is the phase difference, when the system is operated at excitation frequency ?
- Published on 07 Aug 15

a. Phase difference is greater than 90o
b. Phase difference is less than 90o
c. Phase difference is zero
d. Unpredictable

ANSWER: Phase difference is zero

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    Discussion

  • Sravanthi   -Posted on 23 Oct 15
    - Linear variable differential transformer is mutual inductance transducer.

    - The output voltage of LVDT is out of phase with excitation voltage.

    - At excitation frequency phase difference is zero.

    - If a system is operated at excitation frequency, input and output signals are in phase and have high detection and sensitivity.

    - LVDT's have high output voltage and have no intermediate amplification devices.

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