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Method for calibrating misalignment angles of two-dimensional autocollimator

A technology of autocollimator and calibration method, which is applied in the direction of instruments, measuring devices, etc., can solve the problems of limited calibration range, high cost, and difficulty in erection.

Active Publication Date: 2015-06-10
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

However, this calibration method is costly, difficult to set up, and the calibration range is limited

Method used

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  • Method for calibrating misalignment angles of two-dimensional autocollimator
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  • Method for calibrating misalignment angles of two-dimensional autocollimator

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Embodiment Construction

[0037] The present invention controls the change of the azimuth angle and the pitch angle of the reflector through the motor controller, and monitors it with the theodolite, thereby obtaining n×n points (x, y, h) and (x, y, v) respectively, and finally based on matlab, Use multiple surface fittings to fit points (x, y, h) and (x, y, v) respectively, and obtain the coefficients in the formula for calculating the azimuth angle h' and the elevation angle v'. After substituting into the formula, For any point in the imaging area, the corresponding azimuth and elevation angles can be obtained according to the formula.

[0038] The device of the present invention is mainly composed of a two-dimensional autocollimator to be calibrated, a double-sided reflector (both sides are coated with a reflective film, hereinafter referred to as the reflector), a two-dimensional motor controller and a theodolite. The azimuth and elevation angles of the mirror are controlled by a two-dimensional m...

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Abstract

The invention relates to a method for calibrating misalignment angles of a two-dimensional autocollimator. The method comprises the following steps: (1) rotating azimuth angles and pitch angles of a reflecting mirror to determine pixel numbers, azimuth angles and pitch angles (x, y, h, v) in the horizontal direction and the vertical direction corresponding to m*n points; performing fitting on the m*n points by using multiple curved surfaces to obtain corresponding coefficient matrixes of the azimuth angles and pitch angles, and for any point in an imaging region, resolving the azimuth angle and the pitch angle of the point according to the pixel numbers x and y in the horizontal direction and the vertical direction of the point and the coefficient matrix of the azimuth angle and the pitch angle. The method provided by the invention is flexible to use, the fit maximum number of times and the number of measuring points can be continuously changed according to a calibration result until the requirement on the calibration accuracy is met, and moreover, the higher the fitting times is, the more the measuring points are, and the higher the calibration accuracy is.

Description

technical field [0001] The invention belongs to the technical field of photoelectric measurement, and relates to a method for calibrating a misalignment angle of a two-dimensional autocollimator and a device thereof. Background technique [0002] According to the principle of self-collimation angle measurement, the misalignment angle can be calculated by the focal length of the system and the offset of the target point relative to the zero position. However, since the theoretical value of the focal length is different from the actual value after assembly, and it is difficult to measure the focal length after assembly, it is necessary to calibrate the misalignment angle. At present, the domestic and foreign methods to realize two-dimensional misalignment angle calibration mainly include block calibration method, reference calibration method, laser interferometer calibration method and space angle autocollimator calibration method, etc. [0003] The block calibration method d...

Claims

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Application Information

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IPC IPC(8): G01C25/00
CPCG01C25/00
Inventor 杨东来白建明孟阳阳于芳苏
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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