SU1364860A1 - Method and arrangement for measuring angular measures - Google Patents

Abstract

The invention relates to a measurement technique and can be used when calibrating angular measures. It allows to improve the measurement accuracy by eliminating the error of approximation of the systematic error curve of the angular displacement sensor by an approximate analytical expression. The rotatable measure is set on the base 3. When the measuring table 1 rotates with the help of the autocollimator 4, the moments of perpendicularity of the faces of the axis measure of the autocollimator are detected. The information received from the angular displacement sensor 5 in the intervals between serifs is summed up in the computation unit 8. After a certain number of revolutions of the measuring table 1, the computational unit receives information in the control unit 7 of the stepper drive 2, which expands the measure by one step. The operation of moving the measure relative to the measuring table with a certain step and the operation of retrieving information and summing up successively until the base with the measure, having passed the circle, takes the initial position on the measuring table. The information about the measured angle, which enters the computing unit, at each position of the measure relative to the base is averaged and is used to judge the value of the measured angle. 2 sec. f-ly, 1 ill. (L

Description

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The invention relates to a measurement technique and can be used when calibrating angular measures.

The purpose of the invention is to improve the measurement accuracy by eliminating the error of approximation of the curve of systematic error of the sensor of angular displacements by an approximate analytical expression.

The drawing shows a block diagram of the device for implementing the method

The device contains a measuring table 1 with a stepper drive 2 of the angular displacement of the base 3 relative to the measuring table 1. The photoelectric autocollimator is directed to the measured measure, mounted on the base 3. The angular displacement sensor 5 is mounted on the shaft of the angular displacement drive 6 together with. measuring table 1.

Stepper drive 2 is connected to the output of control unit 7, the input of which is connected to the clock output of computing unit 8, the inputs of which are connected to the outputs of the photoelectric autocollimator 4 and the sensor 5 of angular displacements.

The method is carried out as follows.

The measuring table 1 with the stepper drive 2, together with the base 3, on which the measured measure is mounted, is rotated by the angular displacement drive 6. At the output of the sensor 5 of the angular displacements, impulses arise that enter the input of the computational unit 8. At the same time, pulses from the photoelectric autocollimator 4 arrive at the other input of the computational unit 8 at the appropriate moments of perpendicularity of the faces of its axis. The time intervals between these moments characterize the measured angles between the faces of the measure and are determined by summing the sensor pulses 5 angular displacements in the computing unit at a specified time interval After a certain number of revolutions of the signal from the computing unit 8, the control unit 7 with the help of the stepper actuator 2 performs base shift 3 with the measure relative to the measuring table 1 by one step. Then, the acquisition of information about the measured angle and the summation in the computing unit 8 are repeated.

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The steps of moving the measure relative to the table with a certain step, and the step of retrieving information and summing up successively until the base with the measure, having passed the circle, takes the initial position on the measuring table.

Information about the measured angle, which enters the computing unit at each position of the measure relative to the table, is averaged and the value of the measured angle is judged by it.

Claims (2)

1. The method of measuring angular measures, which means that the measured angular measure is placed on a base rigidly connected to the angular displacement sensor, causes the base to rotate, fix the position of the faces of the measure, form a time interval whose duration is equal to the time interval between the moments fixing the faces, measure the angle of rotation of the base during a specified time interval, characterized in that, in order to increase the measurement accuracy, the position of the measure is changed relative to the base by a given angle, repeating Activity measuring the angle of rotation of the base and changing the position of measures as long as the measure is not pass full circle or the ground, and the angle value determined angular measure of the arithmetic mean values of rotation angle measurements of a base. 2. A device for measuring angular measures, containing an angular displacement drive, on the shaft of which a measuring table and a pulse angular displacement sensor, a photoelectric autocollimator and a computing unit are fixed, the corresponding inputs of which are connected to the outputs of the photoelectric autocollimator and angular displacement sensor, which differs from in order to increase accuracy, it is provided with a base mounted coaxially with the measuring table with the possibility of rotation relative to it, with a stepper drive of an angular movement of the base relative to the measuring table, the control unit whose output 313648604 connected to a control input by step-measurements with a clock output, drive, and the computing unit is connected to the input of the control unit It is completed in the form of averaging block by a stepper drive.