A monocular vision-based gravitational field method accelerometer calibration method

An accelerometer and monocular vision technology, which is used in the testing/calibration, speed/acceleration/impact measurement, and calculation of speed/acceleration/shock measurement equipment, etc. The effect of low cost and simple calibration process

Active Publication Date: 2019-05-03
NAT INST OF METROLOGY CHINA +1
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Problems solved by technology

Therefore, in view of the fact that the current gravitational field accelerometer calibration method does not accurately locate the direction of the gravitational field, and there are repeated installation errors when calibrating the

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  • A monocular vision-based gravitational field method accelerometer calibration method
  • A monocular vision-based gravitational field method accelerometer calibration method
  • A monocular vision-based gravitational field method accelerometer calibration method

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Embodiment Construction

[0046] In order to solve the problem that the existing gravitational field method accelerometer has limited calibration accuracy and is only applicable to the two-point method single-axis accelerometer calibration, the present invention provides a gravity field method accelerometer calibration method based on monocular vision, which improves the accuracy of the gravitational field method. The calibration accuracy and applicability of the accelerometer calibration will be described in detail below in conjunction with the accompanying drawings and specific implementation examples.

[0047] refer to figure 1It is a schematic diagram of an implementation example device of the method of the present invention, which mainly includes: a circular turntable 1, a rectangular target 2, a low-frequency acceleration sensor 3, an imaging device fixing device 4, an imaging and acquisition device 5, a plumb line fixing device 6 and a plumb weight and vertical line 7. The circular turntable 1 ...

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Abstract

The invention discloses a monocular vision-based gravitational field method accelerometer calibration method, which mainly comprises the following steps of: proposing a plumb bob method to determine the direction of a gravitational field, and then using a plumb line as an initial reference of a rotation angle of a turntable; using a monocular vision system to shoot a rotary table image, and usinga template matching method to determine a rectangular target feature area in the rotary table image; realizing sub-pixel extraction of the characteristic edge of the rectangular target based on a Zernike moment method; extracting a long edge of the rectangular target by using a cumulative probability Hough Transform (PPHT) algorithm, wherein an included angle between the edge and a plumb line is the rotation angle of the rotary table at the current position; the sensitivity of the accelerometer is calculated by using the measured rotation angle, and the gravitational field method accelerometercalibration at any rotation angle can be realized. According to the method, the defects of limited calibration precision and installation error in multi-axis acceleration timing calibration in the traditional gravitational field method accelerometer calibration are overcome.

Description

technical field [0001] The invention belongs to the field of vibration measurement and testing, and in particular relates to high-precision and stable gravitational field method accelerometer calibration for any rotation angle. Background technique [0002] The validity and reliability of accelerometer measurement data need to be guaranteed by regular calibration, and accelerometer calibration is an important means to ensure accurate measurement of accelerometers. [0003] Commonly used accelerometer calibration methods include laser interferometry, comparison method, reciprocity method, and earth gravity field method. Laser interferometry is divided into fringe counting method and sine approximation method; comparative calibration method is to compare the output of the accelerometer to be calibrated with the output of a known reference standard accelerometer to calculate the sensitivity of the accelerometer to be calibrated; reciprocity method calibration uses reversible ,...

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Application Information

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IPC IPC(8): G06T7/13G06T7/60G01P21/00
Inventor 刘志华何姝熳蔡晨光杨明
Owner NAT INST OF METROLOGY CHINA
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