SU1585680A1 - Automated goniometer for measuring flat angles of polyhedral prisms - Google Patents

Abstract

This invention relates to a measurement technique. The purpose of the invention is to improve the measurement accuracy by increasing the angular resolution of the device. The monitored multifaceted prism 17 rotates with the rotary platform 1. The angular displacement sensor 2 generates pulses whose number is proportional to the angle of rotation of the rotary platform 1. When the optical axis of the autocollimator 6 coincides with the normal to the face of the controlled multifaceted prism 17, an impulse is formed at the output of the autocollimator 6. The discrete value of the time interval between pulses taken from the autocollimator 6 is calculated by the block 7 for counting the entire time intervals. The exact value of the time interval between pulses taken from the autocollimator 6 is calculated using the generator 12, the counter 13, the scaling unit 14 and the subtractor 15. 2 Il.

Description

The invention relates to a measurement technique and can be used to measure the flat angles of multi-faceted prisms.

The purpose of the invention is to improve the measurement accuracy by increasing the angular resolution of the device.

FIG. 1 shows the functional scheme of the goniometer; in fig. 2- time diagrams of signals generated at the outputs of individual goniometer nodes. The goniometer contains a rotary platform 1, an angular displacement sensor 2, kinematically associated with the rotary platform 1 and made in the form of a stroke limb 3, a reading unit 4 and a reference node 5 optically connected with a stroke limb 3, an autocollimator 6 whose optical axis intersects with the axis of rotation of the turntable 1, block 7 counting entire time intervals, executed in the form of a driver 8, the input of which is connected to the output of the auto collimator. 6, the drivers 9 and 10 whose inputs are connected to the node 4 of the reading and nodes 5 starts from the counting, and the pulse counting node 11 and the introduction of corrections, the inputs of which are connected to the formers 8-10, the generator 12, the counter 13, the control inputs of which are connected to the node 11 of the counting of the numbers of pulses and the introduction of corrections and the driver 8, the counting input of the counter 13 is connected to the generator. 12, the scaling unit 14, the input of which is connected to the output of the counter 13, the subtracting unit 15, the inputs of which are connected to the output of the impulse counting and correction section 11 and the output of the scaling unit 14, block 16 calculations, input

20

five

thirty

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35 0

45

five

which is connected to the output of block 15 subtraction.

The flat angles of the multifaceted prism 17 mounted on are controlled. turntable 1.

Goniometer works as follows.

When the rotary platform 1 rotates together with the stroke limb 3 included in the angular displacement sensor 2, the readout unit 4 generates pulses, the number of which is related to the angular position of the rotary platform 1. The origin node 5 generates one pulse per revolution of the stroke limb 3 .

The controllable multifaceted prism 17 rotates together with the turntable 1. When aligned towards the face of the multifaceted prism 17 with the optical axis of the autocollimator 6, an impulse is formed at its input.

The pulses taken from the origin 5, the readout 4 and the autocollimator 6 are fed to the formers 8-10 included in the block 7 for counting whole time intervals.

The angle of rotation of the controlled multifaceted prism 17 from the moment of its formation is. the pulse at the output of the shaper 10 until the pulse is formed at the output of the shaper 8 is roughly estimated at the pulse counting section 11 by counting the number of pulses received from the shaping device 9. In the pulse counting unit 11, correction factors are introduced as a result of counting strokes on the stroke limb 3.

The result of calculating integer time intervals is output to subtractor 15.

After calculating the integer time intervals, the fractional time interval between the pulse removed from the imaging unit 8 and the subsequent pulse removed from the imaging unit 9 is calculated.

The fractional time interval is filled into the counter with 13 pulses taken from the generator 12, and scaled in the scaling unit 14.

The result of the calculation of the fractional time interval is output to the subtraction unit 15, where it is subtracted from the result of the calculation of the entire time intervals,

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The current difference found, which is related to the flat angle of the controlled polyhedral prism 17, enters the computation block 16.

The use of the device improves the measurement accuracy by increasing the angular resolution of the angle sensor.

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15

20

25

585680

Claims (1)

Claims An automated goniometer for measuring flat angles of multifaceted prisms containing a turntable, an angular displacement sensor associated with a turntable, an autocollimator whose optical axis intersects with the axis of rotation of the turntable, an entire time interval counting unit whose inputs are connected to an output autocollimator, and the sensor of angular displacements, which is characterized by the fact that, in order to ensure the accuracy of changes, it is equipped with a generator, a counter, the control inputs of which They are connected with an autocollimator output and an angular displacement sensor; the counter's counting input is connected to a generator, a scaling unit, the input of which is connected to the counter output, a subtraction unit, whose inputs are connected to the output of the entire time interval counting unit and the output of the scaling unit.