Explain the construction and working of LVDT accelerometer with the help of diagram.
2 Answers
Answer :
Working: A type of accelerometer takes advantage of the natural linear displacement measurement of the LVDT to measure mass displacement. LVDT is Linear Variable differential transducer which works on magnetic principle. In these instruments, the LVDT core itself is the seismic mass. Displacements of the core are converted directly into a linearly proportional ac voltage. These accelerometers generally have a natural frequency less than 80 Hz and are commonly used for steady-state and low-frequency vibration. Fig. shows the basic structure of such an accelerometer.
Answer :
Explanation:* The LVDT accelerometer consists of one primary and two secondary windings which are placed on either side of central code. The two ends of the core are connected with spring steel but these are already placed in a casing.* If a core is exactly placed at the center, the voltage produced between primary and secondary windings will be exactly equal; this voltage is called as static field voltage.* If any vibration occurs on the casings of the LVDT accelerometer, the core will either move upward or downward.* Owing to this, the voltage is induced in the secondary coil according to the movement of the core. Now the difference in voltage arises in the output terminal. This output voltage is directly proportional to the vibration or acceleration.