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This paper introduces a self-designed wearable inertial measurement unit (IMU-BMSJv2) and the calibration of its tri-axial accelerometers. We compare two popular accelerometer calibration approaches, the classical method (attitude dependent) and auto calibration method (attitude independent). Both these two calibration methods have been applied for the calibration of the self-designed IMU-BMSJv2;...
A contactless Electro-Magnetic Isolator (EMI) is designed for gravity compensation of a heavy payload by passive Permanent Magnetic (PM) force and control by active Lorentz force. The theoretically calculated PM force and torque produced by this EMI are presented. To characterize the EMI and to evaluate the vibration isolation performance, the Single EMI System (SEMIS) is designed by adding three...
Seismic exploration imposes strict requirements on digital sensor such as large dynamic range and high linearity. Criterions for selecting mechanical parameters of digital sensor are presented for acceptable Brownian noise. System signal and noise transfer functions are then introduced based on high order Sigma-Delta modulation. It is revealed that 5th order Sigma-Delta modulation is required to suppress...
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