Method for calibrating sensitivity of low-frequency multi-axis accelerometer 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 steps of: using a camera to collect a feature mark motion sequence image with the same displacement as the low-frequency multi-axis accelerometer, and measuring the displacement of a feature mark based on a monocular vision method; obtaining an excitation acceleration of the low-frequency multi-axis accelerometer through the measured displacement of the feature mark, and collecting an output voltage signal of the low-frequency multi-axis accelerometer; then realizing the spatial domain alignment of an excitation acceleration signal and an output signal of the low-frequency multi-axis accelerometer based on the space-time synchronization technology; and finally realizing the sensitivity amplitude and phase calibration of the low-frequency multi-axis accelerometer based on a sensitivity matrix. Compared with the existing calibration methods, the method has the advantages of avoiding repeated installation, improving the calibration efficiency, and achieving the calibration of the low-frequency multi-axis accelerometer within awide frequency range on the premise of ensuring the calibration accuracy.

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...

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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:

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