Abstract
In this paper, we present an efficient signal conditioning scheme for a previously developed planar core-less Linear Variable Differential Transformer. The stationary coils are excited with variable amplitude complementary sinusoidal current signals through a Howland source using a closed loop controller in such a way that the moving coil voltage is maintained close to zero. The ratio of the difference to the sum of the amplitudes of the applied voltages is taken as the output, which is proportional to the moving coil position. The highlight is that any external interference can be detected by monitoring the null voltage, which allows taking remedial measures like switching of operating frequency. Tests on a prototype sensor with this scheme implemented shows improvement in positioning performance by more than one order of magnitude under strong interference near the operating frequency. Other benefits include insensitivity to variations in the forward path gain and better update rate. The new scheme also retains the characteristics of tolerance to vertical displacement, good linearity and high resolution previously expounded.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: IEEE Transactions on Instrumentation and Measurement
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
