CN105466455A - Angle measurement precision calibration system and method - Google Patents

Abstract

The invention belongs to the technical field of precision optical testing, and particularly relates to an angle measurement precision calibration system and method. The system comprises a total station, an electric two-dimensional translation table, a cooperation target and a circular prism; an optical axis of the optical measurement component to be calibrated is perpendicular to a translation surface of the electric two-dimensional translation table and passes through a coordinate origin of the electric two-dimensional translation table; the total station is positioned beside the optical measurement component to be calibrated, and the center height of the total station is equal to the height of the coordinate origin of the electric two-dimensional translation table; the cooperation target is arranged at a coordinate origin of the electric two-dimensional translation table; the circular prism is arranged in the direction of a transverse shaft of the electric two-dimensional translation table and is positioned beside the cooperative target, and the center of the circular prism is equal to the center of the cooperative target in height; the distance between the optical measurement component to be calibrated and the total station and the electric two-dimensional translation table is 27-30 m. The invention can meet the high requirement of angle measurement precision and lead the angle measurement error to be small.

Description

A kind of angle measurement accuracy calibration system and method

Technical field

The invention belongs to precision optics technical field of measurement and test, be specifically related to a kind of angle measurement accuracy calibration system and method.

Background technology

Optical measurement is mainly used in measurement Small object being departed to main shaft angle, is widely used in the technical fields such as target identification, target detection at present.Angle measurement accuracy is the of paramount importance technical indicator of optical calibrating measurement component, is the standard weighing optical measurement performance quality.

In the calibration process of angle measurement accuracy, the true value calibrated determines the key factor of measuring error, and therefore the demarcation of true value is often very high to the requirement of testing apparatus, method and personnel.

When accuracy requirement is lower, existing method adopts target plate, target plate being determined, a central point makes it overlap with the initial point of optical calibrating measurement component, choose diverse location at each quadrant and use tape measure translational movement, obtain according to the distance between target plate and optical measurement the true value departing from main shaft angle subsequently, compare with the measured value of optical measurement and obtain angle measurement accuracy.

But when angle measurement accuracy requires higher, said method cannot accurately measure angle measurement accuracy.The first, the measuring accuracy of tape measure is limited; The second, in measuring process, tape measure cannot accurately aim at the mark a little, and the inclination of tape measure and pointing error all can cause measuring error.Be under the condition of 20m ~ 70m at measuring distance, the angle measurement accuracy error comprehensively brought by both is between 0.01mrad ~ 0.05mrad, and the nearlyer then angle measurement accuracy error of distance is larger.

Summary of the invention

In order to solve the above-mentioned technical matters existed in background technology, the invention provides and a kind ofly can meet the little a kind of angle measurement accuracy calibration system of high request angle measurement accuracy, angle error and method.

Technical solution of the present invention is:

The invention provides a kind of angle measurement accuracy calibration system, comprise total powerstation, electronic two-dimension translational platform, cooperative target, circle prism;

The optical axis of optical measurement to be calibrated is perpendicular to electronic two-dimension translational stage translation face and by the true origin of electronic two-dimension translational platform;

Described total powerstation is positioned at by optical measurement to be calibrated, and its center is high contour with the true origin of described electronic two-dimension translational platform;

Described cooperative target is arranged on the true origin place of electronic two-dimension translational platform;

Described round prism is arranged on the X direction of electronic two-dimension translational platform and is positioned at by cooperative target, and center and the cooperative target center of circle prism are contour;

The distance of described optical measurement to be calibrated and total powerstation and electronic two-dimension translational platform is 27m ~ 30m.

In order to total powerstation is convenient to install, this system also comprises and being erected at below total powerstation for regulating the tripod of total powerstation height.

It should be noted that the parts of native system have certain technical indicator, respectively: electronic two-dimension translational stage translation scope is not less than 600mm; Circle prism bore is not less than 40mm, and is coated with reflectance coating, and reflectivity is 99%.

According to the description of above-mentioned angle measurement accuracy calibration system, existing to adopting the angle measurement accuracy scaling method of this system to be described, the method comprises the following steps:

1) locate:

1.1) riding position of optical measurement to be calibrated is determined with total powerstation;

1.2) optical measurement to be calibrated is placed on total powerstation position, requires its optical axis perpendicular to electronic two-dimension translational stage translation face and the optical measurement to be calibrated of true origin by electronic two-dimension translational platform;

1.3) total powerstation is placed on by optical measurement to be calibrated, requires that total powerstation center is high contour with the true origin of electronic two-dimension translational platform;

2) measure:

2.1) cooperative target is placed on the true origin of electronic two-dimension translational platform, circle prism is arranged on the X-direction of electronic two-dimension translational platform and is positioned at by cooperative target, require that the center of its circle prism and cooperative target center are contour;

2.2) aim at circle prism rib point with total powerstation, read the orientation values A of now total powerstation ₁peace is apart from L ₁;

2.3) control electronic two-dimension translational platform and move to any position in optical measurement visual field to be calibrated along X direction, aim at circle prism rib point with total powerstation, read the orientation values A of now total powerstation ₂, pitching value E ₁peace is apart from L ₂;

2.4) control electronic two-dimension translational platform and move to any position in optical measurement visual field to be calibrated along Y again, aim at circle prism rib point with total powerstation, read the pitching value E of now total powerstation ₂;

2.5) the deviation angle θ of optical measurement main shaft to be calibrated is departed from by optical calibrating measurement component acquisition cooperative target to be calibrated;

3) demarcate:

3.1) by formula (1) and formula (2) computer azimuth angle and pitching angle:

A＝|A ₂-A ₁|…………(1)

E＝|E ₂-E ₁|…………(2)

3.2) X is calculated to translation distance by formula (3):

$X=\sqrt{{L_1}^2+{L_2}^2-2L_1{L}_2\cos A}...\left(3\right)$

3.3) calculating Z-direction translation distance by formula (4) is:

Z＝L ₂·tanE…………(4)

3.4) by formula (5) computational rules apart under angle measurement accuracy Δ:

$\mathrm{\Δ}=\left|{\tan }^{-1}\left(\frac{\sqrt{X^2+Z^2}}{L}\right)-\mathrm{\θ}\right|...\left(5\right),$

In formula:

A-orientation angle;

E ₁, E ₂the pitching value that-total powerstation records;

E-pitching angle;

L ₁, L ₂the flat distance that-total powerstation records;

The transverse translation distance of X-electronic two-dimension translational platform;

The longitudinal translation distance of Z-electronic two-dimension translational platform;

The distance of L-optical measurement to be calibrated and electronic two-dimension translational platform;

θ-step 2.5 survey and depart from main shaft angle;

Δ-angle measurement accuracy.

Advantage of the present invention is:

1, high-level efficiency.Present invention employs total powerstation, can coordinate with circle prism and directly read plan range, under the condition ensureing equal accuracy, Measuring Time can be made to shorten over half.

2, high precision.Present invention employs total powerstation and electronic two-dimension translational platform, the translation distance of moving guide rail in electronic two-dimension translational platform is obtained by total powerstation, and obtain angle measurement accuracy thus, eliminate the measuring error brought by tape measure, simultaneously, the omnidistance total powerstation that uses is measured, and improves pointing accuracy, reduces the error aiming at and bring.

Accompanying drawing explanation

Fig. 1 is the test schematic diagram of angle measurement accuracy calibration system provided by the present invention.

Embodiment

The invention provides a kind of angle measurement accuracy calibration system and method, see Fig. 1, this system comprises total powerstation 2, circle prism 3, cooperative target 4, electronic two-dimension translational platform 5;

The optical axis of optical measurement 1 to be calibrated is perpendicular to electronic two-dimension translational platform 5 translational plane and by the true origin of electronic two-dimension translational platform 5;

It is other that total powerstation 2 is positioned at optical measurement 1 to be calibrated, and its center is high contour with the true origin of described electronic two-dimension translational platform 5;

Cooperative target 4 is arranged on the true origin place of electronic two-dimension translational platform 5;

Circle prism 3 is arranged on the X direction of electronic two-dimension translational platform 5 and to be positioned at cooperative target 4 other, its center and cooperative target 4 center contour;

Optical measurement 1 to be calibrated and total powerstation 2 are 27m ~ 30m with the distance of electronic two-dimension translational platform 5.

Total powerstation 2 in this system is placed on tripod, and electronic two-dimension translational platform 5 liang of translation directions are parallel with vertical hair with total powerstation 2 visual graticule horizontal hair respectively; Total powerstation 2 is equal with the distance of electronic two-dimension translational platform 5 liang of translating rails

Total powerstation has display screen, can the position angle of measurement target and the angle of pitch, and the distance of can and justify between prism conjunction measuring total powerstation and circle prism, and with the display of the form of angle and distance on a display screen, can be calculated, when measuring distance is 20m ~ 70m, the angle measurement accuracy error brought by total powerstation is between 0.002mrad ~ 0.003mrad.

Wherein also it should be noted that, electronic two-dimension translational platform 5 range of translation of this system is not less than 600mm.Circle prism 3 bore is not less than 40mm, and is coated with highly reflecting films, and reflectivity can reach 99%.

Cooperative target can send laser and be received by optical measurement to be calibrated, obtains departing from main shaft angle.

Settle testing apparatus according to Fig. 1, for the Ith quadrant, method of the present invention is as follows:

Step 1) location:

Step 1.1) riding position of optical measurement to be calibrated is determined with total powerstation;

Specific practice is: select the place of steady shock insulation to settle tripod, total powerstation installed by tripod, by total powerstation leveling, electronic two-dimension translational platform is vertically settled at predetermined distance place, use hand-held stadia surveying total powerstation to the distance of bidimensional translation stage the right and left and be adjusted to equidistant, using vertical to adjust bidimensional translation stage vertical direction simultaneously; Adjustment tripod height, make bidimensional translation stage true origin and total powerstation center contour, adjust bidimensional translation stage, graticule horizontal hair visual with total powerstation is parallel with vertical hair respectively to make its two translation direction; Circle prism is fixed on the true origin place of bidimensional translating rails, uses total station survey to bidimensional translation stage distance, adjustment total powerstation front and back position makes itself and bidimensional translation stage distance be predetermined distance;

Step 1.2) optical measurement to be calibrated is placed on total powerstation position, require its optical axis perpendicular to electronic two-dimension translational stage translation face and the optical measurement to be calibrated of true origin by electronic two-dimension translational platform;

Step 1.3) total powerstation is placed on by optical measurement to be calibrated, require that total powerstation center is high contour with the true origin of electronic two-dimension translational platform;

Step 2) measure:

Step 2.1) cooperative target is placed on the true origin of electronic two-dimension translational platform, circle prism is arranged on the X-direction of electronic two-dimension translational platform and is positioned at by cooperative target, requires that the center of its circle prism and cooperative target center are contour;

Step 2.2) aim at circle prism rib point with total powerstation, read the orientation values A of now total powerstation ₁peace is apart from L ₁;

Step 2.3) control electronic two-dimension translational platform and move to any position in optical measurement visual field to be calibrated along X direction (X-direction), aim at circle prism rib point with total powerstation, read the orientation values A of now total powerstation ₂, pitching value E ₁peace is apart from L ₂;

Step 2.4) control electronic two-dimension translational platform and move to any position in optical measurement visual field to be calibrated along Y (Z-direction) again, aim at circle prism rib point with total powerstation, read the pitching value E of now total powerstation ₂;

Step 2.5) obtain by optical calibrating measurement component to be calibrated the deviation angle θ (the optical measurement main shaft to be calibrated said refers to the optical axis of optical measurement to be calibrated itself in fact) that cooperative target departs from optical measurement main shaft to be calibrated herein;

Step 3) demarcate:

Step 3.1) by formula (1) and formula (2) computer azimuth angle and pitching angle:

A＝|A ₂-A ₁|…………(1)

E＝|E ₂-E ₁|…………(2)

Step 3.2) calculate X to translation distance by formula (3):

$X=\sqrt{{L_1}^2+{L_2}^2-2L_1{L}_2\cos A}...\left(3\right)$

Step 3.3) by formula (4) calculating Z-direction translation distance be:

Z＝L ₂·tanE…………(4)

Step 3.4) by formula (5) computational rules apart under angle measurement accuracy Δ:

$\mathrm{\Δ}=\left|{\tan }^{-1}\left(\frac{\sqrt{X^2+Z^2}}{L}\right)-\mathrm{\θ}\right|...\left(5\right),$

In formula:

A-orientation angle;

E ₁, E ₂the pitching value that-total powerstation records;

E-pitching angle;

L ₁, L ₂the flat distance that-total powerstation records;

The transverse translation distance of X-electronic two-dimension translational platform;

The longitudinal translation distance of Z-electronic two-dimension translational platform;

The distance of L-optical measurement to be calibrated and electronic two-dimension translational platform;

θ-step 2.5 survey and depart from main shaft angle;

Δ-angle measurement accuracy.

By can be calculated, when measuring distance is 20m ~ 70m, the angle measurement accuracy error of the method can reach between 0.002mrad ~ 0.003mrad.

Claims (4)

1. an angle measurement accuracy calibration system, is characterized in that: comprise total powerstation, electronic two-dimension translational platform, cooperative target, circle prism;

The optical axis of optical measurement to be calibrated is perpendicular to electronic two-dimension translational stage translation face and by the true origin of electronic two-dimension translational platform;

Described total powerstation is positioned at by optical measurement to be calibrated, and its center is high contour with the true origin of described electronic two-dimension translational platform;

Described cooperative target is arranged on the true origin place of electronic two-dimension translational platform;

Described round prism is arranged on the X direction of electronic two-dimension translational platform and is positioned at by cooperative target, and center and the cooperative target center of circle prism are contour;

The distance of described optical measurement to be calibrated and total powerstation and electronic two-dimension translational platform is 27m ~ 30m.

2. angle measurement accuracy calibration system according to claim 1, is characterized in that: also comprise and being erected at below total powerstation for regulating the tripod of total powerstation height.

3. angle measurement accuracy calibration system according to claim 1 and 2, is characterized in that: described electronic two-dimension translational stage translation scope is not less than 600mm; Described round prism bore is not less than 40mm, and is coated with reflectance coating, and reflectivity is 99%.

4., based on the angle measurement accuracy scaling method of angle measurement accuracy calibration system according to claim 1, it is characterized in that, comprise the following steps:

1) locate:

1.1) riding position of optical measurement to be calibrated is determined with total powerstation;

1.2) optical measurement to be calibrated is placed on total powerstation position, requires its optical axis perpendicular to electronic two-dimension translational stage translation face and by the true origin of electronic two-dimension translational platform;

1.3) total powerstation is placed on by optical measurement to be calibrated, requires that total powerstation center is high contour with the true origin of electronic two-dimension translational platform;

2) measure:

2.1) cooperative target is placed on the true origin of electronic two-dimension translational platform, circle prism is arranged on the X-direction of electronic two-dimension translational platform and is positioned at by cooperative target, require that the center of its circle prism and cooperative target center are contour;

2.2) aim at circle prism rib point with total powerstation, read the orientation values A of now total powerstation ₁peace is apart from L ₁;

2.3) control electronic two-dimension translational platform and move to any position in optical measurement visual field to be calibrated along X direction, aim at circle prism rib point with total powerstation, read the orientation values A of now total powerstation ₂, pitching value E ₁peace is apart from L ₂;

2.4) control electronic two-dimension translational platform and move to any position in optical measurement visual field to be calibrated along Y again, aim at circle prism rib point with total powerstation, read the pitching value E of now total powerstation ₂;

2.5) the deviation angle θ of optical measurement main shaft to be calibrated is departed from by optical measurement acquisition cooperative target to be calibrated;

3) demarcate:

3.1) by formula (1) and formula (2) computer azimuth angle and pitching angle:

A＝|A ₂-A ₁|…………(1)

E＝|E ₂-E ₁|…………(2)

3.2) X is calculated to translation distance by formula (3):

$X=\sqrt{{L_1}^2+{L_2}^2-2L_1{L}_2\cos A}...\left(3\right)$

3.3) calculating Z-direction translation distance by formula (4) is:

Z＝L ₂·tanE…………(4)

3.4) by formula (5) computational rules apart under angle measurement accuracy Δ:

$\mathrm{\Δ}=|{\tan }^{-1}\left(\frac{\sqrt{X^2+Z^2}}{L}\right)-\mathrm{\θ}|...\left(5\right),$

In formula:

A-orientation angle;

E ₁, E ₂the pitching value that-total powerstation records;

E-pitching angle;

L ₁, L ₂the flat distance that-total powerstation records;

The transverse translation distance of X-electronic two-dimension translational platform;

The longitudinal translation distance of Z-electronic two-dimension translational platform;

The distance of L-optical measurement to be calibrated and electronic two-dimension translational platform;

θ-step 2.5 survey and depart from main shaft angle;

Δ-angle measurement accuracy.