A low-frequency multi-axis accelerometer sensitivity calibration method based on monocular vision

Abstract

The invention discloses a method for calibrating the sensitivity of a low-frequency multi-axis accelerometer based on monocular vision. The method comprises the following steps: using a camera to collect a feature marker motion sequence image with the same displacement as the low-frequency multi-axis accelerometer, and measuring the characteristic based on the monocular vision method. The displacement of the mark; the excitation acceleration of the low-frequency multi-axis accelerometer is obtained through the measured characteristic mark displacement, and the output voltage signal of the low-frequency multi-axis accelerometer is collected; then based on the space-time synchronization technology, the excitation acceleration signal of the low-frequency multi-axis accelerometer and its output signal are realized. Spatial domain alignment; finally, the sensitivity amplitude and phase calibration of the low-frequency multi-axis accelerometer is realized based on the sensitivity matrix. Compared with the existing calibration method, on the premise of ensuring the calibration accuracy, the method can avoid repeated installation, improve the calibration efficiency, and realize the calibration of the low-frequency multi-axis accelerometer in a wide frequency range.

Description

technical field [0001] The invention belongs to the field of vibration measurement and testing, and more specifically relates to a method for calibrating the sensitivity of a low-frequency multi-axis accelerometer. Background technique [0002] Low-frequency accelerometers are increasingly used for vibration monitoring in wind power generation, earthquakes, and bridge and building structural safety. In order to better meet the vibration monitoring requirements of the actual environment, low-frequency multi-axis accelerometers are often used for vibration monitoring. The sensitivity of the low-frequency multi-axis accelerometer is a known value in its practical application, which directly affects the reliability of its vibration measurement results. Therefore, it is particularly important to study a high-precision low-frequency multi-axis accelerometer sensitivity calibration method to ensure its vibration measurement accuracy. [0003] At present, commonly used low-frequen...

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the current calibration of low-frequency multi-axis accelerometers, such as repeated installation errors, long calibration time, or limited calibration frequency range, unsuitable for low-frequency calibration, complex system and high cost, the present invention provides an efficient and low-frequency low-frequency accelerometer. Calibration methods for multi-axis accelerometers, including:

Images