Spatiotemporal Synchronization-Based Monocular Vision Dynamic Calibration Method for Low-Frequency Linear and Angular Accelerometers

The linear and angular accelerometers are the most basic motion measurement components, which have been widely utilized in various engineering fields. However, the existing calibration methods make it difficult to determine their sensitivity magnitude and phase simultaneously with high accuracy and efficiency. This study proposes a novel monocular vision (MV) method to calibrate low-frequency linear and angular accelerometers, which has the ability to determine the sensitivity magnitude and phase accurately by using spatiotemporal synchronization technology. This method improves the calibration performance by adopting a zero-encoder pulse to efficiently align the spatial excitation and time signal, and it can be easily implemented on a flexible vision measurement system. Experiments compared with the comparison method (CM) and laser interferometry (LI) show the proposed method can obtain the calibration accuracies of sensitivity magnitude and phase about 0.3% and 0.3° with a considerable efficiency in 0.01–10 Hz.