Calibration technique for sensitivity variation in RVDT type accelerator position sensor

This paper presents a calibration technique for RVDT sensitivity variation, which occurs as a result of using high excitation frequency and changing the distance between the coil printed on PCB and the magnetic core. An additional secondary coil and new signal processing are employed to calibrate the sensitivity variation. The output voltage amplitude of this additional coil is not affected from rotation of the magnetic core, and is changed by distance between the coil and the magnetic core. The proposed signal processing can calibrate the sensitivity variation without being influenced by environmental factors such as humidity and temperature. The proposed method calibrates sensitivity variation by 76% compared to the conventional method when the distance between the coil and the magnetic core changes by ±0.2 mm around 1.0 mm.