SU547804A1 - Variable Speed Photoelectric Motion Converter to Digital Code - Google Patents

Description

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The invention relates to the conversion of analog values to a digital code and can be used to convert variable speed movements to a digital code.

Nowadays, for converting movements into digital code, use is made of converting various principles of action, including photoelectric ones, which transform the measured movements into a series of pulses. The disadvantage of such converters is that those. change in speed is not determined.

Known transducer displacement with variable speed into a digital code containing the illuminator, connected via a code disk with a photodetector, which is connected through an amplifier to one of the gate inputs, the output of which is connected to the counter input, a clock generator connected to the zero input of the counter, the outputs of which code-voltage converter is connected to the input

recording device and delay unit 2.

This converter determines the nature of the change in movement over time, but its circuitry is complex.

The purpose of the invention is to simplify the converter.

This is achieved by introducing a trigger, the zero input of which is connected to the output of the clock generator, and a single input connected to the output of the clock generator through a delay unit, the output of the trigger is connected to another input of the valve.

The drawing shows a diagram of a variable speed displacement transducer into a digital code.

The converter consists of a rotating code disk 1 with slots evenly spaced around the circumference. On one side of the disk is the illuminator 2, on the other side the photodiode 3 (photodiode), the output of which is connected to the input of amplifier 4, and the output of amplifier 4 is connected to the pulse input of the valve 5, the output of which is connected to the input of counter 6, counting

impulses. The output of the counter 6 is connected to the input of the converter 7 code-voltage, the output of which is connected to the input of the recording device 8. The output of the generator 9 clock pulses is connected to the zero input of the counter 6 and the trigger 10 and to the single trigger input 10 through the delay unit 11, Single trigger output 10 is connected to the potential input of the valve 5.

The converter works as follows.

A 9 clock pulse generator is started. The clock pulse from the output of the generator 9 sets the counter 6 and the trigger 10 to the zero position, but the trigger through the delay unit 11 is set to the single position. The high potential from the single output of the trigger 10 is applied to the potential input of the valve 5 and prepares it for receiving pulses. With the rotation of the code disk 1, the light from the illuminator 2 passes through the slots to the photodetector 3, the photodetector pulses go to the amplifier 4. The amplified photodetector pulses through the valve 5 are counted by the counter 6, the pulse counting continues until the second clock pulse arrives. With the arrival of the second clock pulse, the counter 6 and the trigger 10 go to the zero position, and the trigger 10 through the delay unit 11 is set to the single position. The high potential from the single output of the trigger 1O again prepares the pulse receiving circuit to the counter 6. The contents of the counter 6 are converted into voltage by the converter 7, the code-voltage that goes to the recording device 8. It should be noted that by decreasing the duration between two clock pulses improve the accuracy of conversions.

Thus, the counter readings in each conversion cycle will characterize the disk rotation angle in the digital code. If the readings of the counter are the same in each conversion cycle, this means that the disk rotates at a constant speed; otherwise, the disk rotates at a variable speed.

Thus, in each conversion cycle, the digital code in the counter is equivalent to the speed of movement, and the nature of the change in movement is determined by the recording device.

Claims (1)

1. Litvak V.I. Photoelectric devices and controllers in mechanical engineering, Moscow, Energii publishing house, p. 96., 1962. 2, USSR Author's Certificate No. 511690, M., cl. H 03 K 13/02, 01.O4.74.