Low-frequency vibration calibration method based on monocular vision

Abstract

The invention discloses a low-frequency vibration calibration method based on monocular vision. The method comprises the following steps that: utilizing a nonlinear camera model with radial distortionto realize high-accuracy camera calibration; putting forward an effective image enhancement method to realize the enhancement of blurred images of different motion directions to guarantee the position accuracy of an enhanced edge; then, on the basis of a sub pixel edge detection method of a Zernike moment, realizing the high-accuracy characteristic edge extraction of an enhanced sequence image; on the basis of a vision measurement model, measuring the spatial motion displacement of the characteristic edge; and utilizing the output voltage signals, which are synchronously collected, of a low-frequency vibration sensor and a low-frequency vibration measuring instrument to realize low-frequency vibration calibration. By use of the method, on a premise that calibration accuracy is effectivelyguaranteed, low-frequency vibration calibration can be stably, reliably and quickly realized. By use of the method, the deficiencies that an existing low-frequency vibration calibration method is limited in calibration accuracy, complex in process and complex in system for the low-frequency vibration sensor and the measuring instrument and is not suitable for wide-frequency range calibration areeliminated.

Description

technical field [0001] The invention belongs to the field of vibration measurement and testing, and is especially suitable for high-precision, stable and reliable low-frequency vibration calibration in a wide frequency range. Background technique [0002] Low-frequency vibration sensors and low-frequency vibration measuring instruments are increasingly used in earthquake prediction, bridge and building monitoring, mineral exploration and other fields. The sensitivity of low frequency vibration sensors and measuring instruments is extremely important for their accurate vibration measurements. Low-frequency vibration calibration is used to determine the sensitivity of low-frequency vibration sensors and measuring instruments, which is the premise to ensure accurate, reliable and effective vibration measurement data. Therefore, the research on low-frequency vibration calibration is of great significance. [0003] The commonly used low-frequency vibration calibration methods a...

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Problems solved by technology

[0005] In view of the shortcomings of the current low-frequency vibration calibration method that cannot be applied to a wide frequency range, limited precision, com

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