SU1758425A1 - Method of adjusting device for measuring plane angles - Google Patents

Abstract

The invention relates to an instrumentation technique and can be used when measuring the angular dynamics between the reflecting surfaces of an object using an autocollimator. The purpose of the invention is to improve the accuracy of the adjustment. A reflector is installed on the stage, it is successively tilted relative to the plane of the table, first in one direction and then in the other direction, thus converting the autocollimation images into a sequence of electrical signals, adjusting the output circuit of the autocollimator to the zero value of the difference of these values. 3 or

Description

The invention relates to a measuring and control technique and can be used to align the device when measuring the angles between the reflections of an object in dynamics using an autocollimator.

A known method for measuring the angles of a multifaceted prism is that autocollimation images of marks are formed at the edges of the prism mounted on the measuring table, the table is brought into continuous uniform rotation, and the positions of the aztocollimation images of the marks in the field of view of the autocollimator are recorded by fixing the passage points them by the entrance slit of the photoelectric recorders, and by the time intervals between the recorded moments, the magnitude of the angles of the checked many-sided prism is judged,

The disadvantage of this method is the presence of an error associated with the pyramidal measure arising when the output slit of the autocollimator is tilted.

The closest to the technical essence is the method of adjusting the device for measuring flat angles based on measuring the flat angles of the angular measure, in order to improve the accuracy of the alignment set the pyramid of the reflecting surfaces of the angular measure, set the flat mirror at an angle to the axis of the autocollimator, receive multiple reflections of the autocollimator radiation flux between the mirror surface of the measure and the flat mirror, register the image avtokollimators, AB- tokllimatora fixed indications for two arbitrarily chosen values of the measured angle and comparing their adjusted position indications output by the autocollimator vanishing gap readings between them.

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The disadvantage of this method is the limitation of the accuracy of the adjustment due to the fact that during the adjustment the change is made to a sufficiently large angle (as is known, the measurement error of the angle is directly proportional to the angle measurement).

The purpose of the invention is to improve the accuracy of the adjustment.

To achieve this goal, in the method of adjusting the device for measuring flat angles, including registering images of the autocollimation mark and measuring the angle between them, obtaining, comparing these values and adjusting the output slot of the autocollimator to a zero value, a wedge-shaped reflector (between the sides of receive multiple reflections of the beam of the autocollimator when the table is rotated) successively tilt one side of the reflector relative to the plane and the first section in one direction and then in another direction, for these two positions recorded converted into an electrical signal sequence of n-uniform reflections and indications are fixed autocollimator section for rotation angles between two similar reflections.

As can be seen, in this solution, in the course of alignment, a measurement of the table rotation angles between reflections from the same plane, i.e. small angles, which leads to increased accuracy.

Fig, 1 shows a device that implements this method.

The device contains a measuring table 1 with a template with mirrors 2, 3 located on it. The output of the autocollimator 4 is connected to the input of the logic unit 5, the output of which is connected to the input of the computing unit 6.

FIG. 2 shows the angular positions of the mirror 2 on the subject table 1; in fig. 3 - projections of the autocollimation grade 3 with repeated reflection in the plane of the exit slit 7 of the autocollimator 4.

A device that implements the proposed method works as follows.

A template consisting of two mirrors 2 and 3 is placed on the object table 1. The reflecting surface of the mirror 2 is set relative to the plane of the table 1 at an acute angle / 5 (Fig. 2).

With continuous rotation of the object table 1. At the output of the autocollimator 4, the first pulse is seen when the beam of the autocollimator is perpendicular to the vertical projection of the reflecting

the surface of mirror 2. In this case, the image of the autocollimation mark in the plane of the exit slot of the autocollimator will be at level 1, shifted from the origin of coordinates upward along the Y axis, in proportion to (t -, - #) (see Fig. 3).

In the case of an exit slit of the autocollimator relative to the axis of rotation

an object table at an angle y, the image of the autocollimation stamp will be offset from the origin of coordinates along the X axis by an angle proportional to D |.

As a result, the first impulse is

at the exit of ФЭАК4 with shift AL. Similarly, the second pulse at the output of the autocollimator 4 is in Wits, when the beam of the autocollimator 4 reflected from mirror 2 falls perpendicular to mirror 3. In this case, the image of the autocollimation mark in the plane of the output gap of FEAC will be shifted by an angle 2 Dg. relative to X. As a result, the second pulse is wits at the output of FEAC

4 from Dg.

As a result of multiple reflections between the surfaces of mirrors 2 and 3, the images between the surfaces of the autocollimator output slit will be successively

shift to levels 3, 4p, respectively, with a shift Dz, D), Dp s at the output of FEAK, there will be a sequence of pulses, respectively, with shifts Dz, DADp.

Using logic unit 5, the 1st and nth pulses are extracted. The computing unit measures the angle cm, between the 1st and the nth pulse.

In this case, the measured value of the angle will be:

“1 0 nisg + (Dg + + TO where GV, CT is the true value of the angle between the 1st and nth pulses.

Install the mirror surface 2

relative to the plane of the subject table 1 at an obtuse angle p.

A completely similar picture will be observed when the template passes in front of FZAK4, i.e. as a result of multiple reflections between mirrors 2 and 3.

In this case, the image of reflected rays in the plane of the exit slit 7 of FEAC 4 will be shifted down from the origin of coordinates along the Y axis to levels 1, 21

n and respectively, with shifts to the left of

the origin of coordinates along the X axis with shifts D, .... D}, (see Fig. 3).

The measurement of the angle oa between the same order pulses of the 1st and the second is made. At the same time, the measured value of the angle will be:

OL "ist - (& + ... And- Until)

As can be seen from the above, and it will be equal to α when the angle is at 0.

Thus, the output gap of FEAC is controlled until the difference "2 - a 0.

Claims (1)

The invention The method of alignment device for measuring flat angles, consisting of image of the autocollimation mark and measuring the angle between them, comparing these values and adjusting the output slit of the autocollimator to a zero value, characterized in that, in order to improve the accuracy of the adjustment, a reflector is mounted on the stage, it is successively tilted relative to the plane of the table first by one then in the other direction, with the conversion of autocollimation images into a sequence of electrical signals, according to which the operation of the device is judged va. Schi3.2 ®й /