Video autocollimator

FIELD: physics.

SUBSTANCE: video autocollimator has a lens, an autocollating mirror, a beam-splitting unit, an illuminator, a reading device, as well as a test mark and a photodetector, lying in focal planes of the lens. An image of the test mark reflected by the beam-splitting unit is directed by the lens onto the autocollimating mirror, reflected therefrom and then projected by the same lens through the beam-splitting unit onto the photodetector. The photodetector has a CCD array with a standard video signal generating device. The reading device is in form of a computer with a video processor and an application program for calculating the angular position of the autocollimating mirror. The test mark is in form of a circular window whose diameter is calculated using the formula where ρ" is the conversion of radians to angular seconds, M is the effective size of the CCD array in mm, K is the number of video frames processed in the measurement, f' is the focal distance of the lens in mm, N is the number of discrete units selected on coordinate axes of the video frame, Δφ is the permissible error in angular seconds.

EFFECT: easier manufacturer and operation.

1 dwg

 

The invention relates to the field of technical physics and, in particular, for measuring the angular position of the autocollimating mirror.

Known optical autocollimators, based on the visual principle of measurement /1/. These include, in particular, are widespread autocollimators ACU-1 and ACU-0.5 and AKU-2,5 respectively with a resolution of 1, 0.5 and 0.25 arcsec. They contain the illuminated test-mark in the form of a cross, installed in the focal plane of the lens. The image of the test mark of the lens parallel rays of light is directed to the autocollimating mirror, is reflected from it, returns to the lens and through the beam splitting node is projected on a special scale, also installed in the focal plane of the lens. Scale, usually made in the form of a grid of threads. It is projected the image of the test mark, which is viewed through the eyepiece. The measurement is performed by detecting the position of the image of the test mark (cross) on a scale that is proportional to the desired angular position of the autocollimating mirror.

The main disadvantage of optical autocollimators is a visual measuring principle without automation capabilities.

Also known photovoltaic autocollimators, based on the automated principle measure the /2/. They also used a test mark in the form of cracks, which images on the two measurement channels are projected on two of the photodetector, which allows to determine the angular position of the autocollimating mirror in two mutually perpendicular planes (vertical and horizontal). The signals of the photodetectors are controlled by two servo-mechanism, implementing the provisions of the images of the test marks on the photodetector so that they took a certain "zero" position. The measurement results are output codes of the two displacement sensors associated with the servo-mechanisms. For phase separation channel measurements autocollimator is equipped with an Electromechanical light modulator.

The disadvantage of the photoelectric autocollimator is a complex optical and kinematic scheme.

Closest to the claimed invention by a combination of traits (prototype) is a photoelectric autocollimator type AF-1TS, with two measurement channels, therefore it contains the test-mark in the form of two crosses, a light modulator, two of the photodetector, two servo-mechanism and two coded position sensor. On the basis of the signals of the photodetectors servomechanisms work out the "zero" position of the image of the test mark in the directions of the coordinate axes, and the measurement results are output codes the sensor is in movement, proportional to angular positions autocollimating mirror the directions of these axes (horizontal and vertical).

The prototype of the inherent disadvantages associated with complex optical and Electromechanical assemblies.

The problem solved by the present invention is to remedy these disadvantages by simplifying the optical node, exception Electromechanical node containing the light modulators and the servo-mechanisms, and facilitate the test of the brand.

To solve this problem in the proposed videoamatoriali containing autocollimating mirror, the lens, the beam splitting node, the illuminator, the reading device, and the test mark and a photodetector mounted in the focal planes of the lens so that the image of the test mark, the reflected beam splitting unit, the lens is directed to the autocollimating mirror, is reflected from it and the same lens through the beam splitting node is projected onto the photodetector, wherein the photodetector includes a CCD sensor with a processing unit of a standard video signal, a readout device in the form of computer processor and a software program to calculate the angular position of the autocollimating mirror, and the test mark is made in the form of a circular box, the diameter of which is calculated by f is rule:

,

where ρ" is the conversion factor radian in arcsec;

M is the effective size of the CCD matrix in mm;

K - the number of frames processed in the measurement;

f' is the focal length of lens in mm;

N is the number of samples allocated on coordinate axes of the video.

Δφ is permissible error in angular seconds.

The invention is illustrated by figure 1, which shows a device for the formation of a standard video signal 1 CCD 2, the illuminator 3 in the form of a semiconductor led, test-mark 4 in the form of a circular window, the beam splitting node 5, a lens 6, the computer 7 from the video processor 8 and the application program, and the autocollimating mirror 9.

Videoamatoriali works as follows.

The image of the test mark 4, the reflected beam splitting node 5, a lens 6 into parallel rays of light is directed to the autocollimating mirror 9 is reflected from it and the same lens 6 through the beam splitting node 5 is projected on the CCD sensor 2, on the basis of the signals which the device 1 is formed by a standard video signal VS containing the image of the test mark.

When changing the angular position of the autocollimating mirror 9 with respect to the optical axis of videoaudiogenerator coordinates of the center of the image of the test mark in the video frame change that is used as a basis for measurement.

Measurements are performed under control of the application computer program, and the video processor 8 is converted from analog into digital form, defined by coordinates of the contour points of the round image of the test mark in the video frame, based on these coordinates are calculated coordinates of the center of the image of the test mark in the video and on the basis of the last coordinate is the desired angular position of the autocollimating mirror 9 with respect to the optical axis of videoaudiogenerator.

The proposed videoamatoriali in comparison with the prototype contains a simpler optical node and the test mark. As the photodetector uses a modular camera with a CCD matrix, forming a standard video image of the test mark. Mentioned modular cameras are manufactured on an industrial basis and in mass quantity, which ensures their high reliability and low cost. Working with standard video allows you to pass it on standard TV channels, including satellite, at any distance. As the GPU can be used typical device controllers, framegrabber and videoblaster, also produced on an industrial basis and in mass quantity.

Round window test brand in comparison with any other window Faure, the s has the advantage when scanning television all rows of the image in the frame coordinates of its center are not changed when the rotation.

With the increase of the diameter of the circular window test marks decreases the error videoaudiogenerator, but decreases the range of angular measurements, and as a result, the optimal diameter is calculated by the formula.

For example, for M=4.8 mm, f=200 mm, N=767, K=16 and Δφ=0,1 coal. sec. get D≈0,8 mm

Sources of information

1. Spiridonov A.I., Kulagin YU.N., Hooks G.S. Guide - catalogue surveying instruments. M.: Nedra, 1984, s.

2. Afanas'ev, V.A., Zhilkin A. M. Usov, V.S. Autocollimating units. M.: Nedra, 1982, s.

Videoamatoriali containing the lens, the autocollimating mirror, the beam splitting node, the illuminator, the reading device, and the test mark and a photodetector mounted in the focal planes of the lens so that the image of the test mark, the reflected beam splitting unit, the lens is directed to the autocollimating mirror, is reflected from it and the same lens through the beam splitting node is projected onto the photodetector, wherein the photodetector includes a CCD sensor with a processing unit of a standard video signal, a readout device in the form of computer processor and application program for Vici the population angular position of the autocollimating mirror, and the test mark is made in the form of a circular box, the diameter of which is calculated by the formula:

where ρ" is the conversion factor radian angular seconds;
M is the effective size of the CCD-matrix, mm;
K - the number of frames processed in the measurement;
f' is the focal length of the lens, mm;
N is the number of samples allocated on coordinate axes of the video.
Δφ is permissible error in angular seconds.



 

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