SU1229568A1 - Photoimpact diameter gauge - Google Patents

Abstract

The invention relates to a measurement technique and can be used, for example, in the cable industry to measure the diameter of a wire. The aim of the invention is to improve the measurement accuracy by increasing the noise immunity of the device. The light from the light source 1 through the illumination system 2 hits the controlled product 24. When the shadow image of the product is deployed using a disc 3 with a cut along the periphery, the pulse former 12 forms a measurement pulse 26 from the photodetector 10, and the pulse former 13 generates a pulse 27 "lens field of view from the photodetector 11 when light hits it through the cutout of the disk 3. The measuring pulse 26 is filled with pulses from the generator 23 pulses and through the element 14, the counter 15, the memory register 16 is recorded in Indicator 17. Recording in the indicator 17 is dried when an enabling pulse is present from element I 21. If, during the presence of a pulse, the objective field of the lens at the output of the driver 13 pulses from the output of the driver 12 pulses several measuring pulses 26 (the fragmentation of the measuring pulse due to interference), the counter 19 through the element And 18 writes a number greater than "1, and the decoder 20 does not allow the result to be copied to the indicator 17. The control unit 22 synchronizes the operation of the device. 3 il. i (L S GS o sd sd O5 00

Description

The invention relates to a measurement technique and can be used, for example, in the cable industry to measure the diameter of a wire.

The aim of the invention is to improve the measurement accuracy by increasing the noise immunity of the device.

FIG. 1 is a block diagram of the device; in fig. 2 - time diagram of work; in fig. 3 shows a cut-out disk configuration.

The device contains (Fig. 1) a source of light 1, an illumination system 2, a disk 3 with an opening 4 and a notch along the periphery (Fig. 3), a disk 3 (Fig. 1) is kinematically connected with an electric drive 5, which together with the disk form a block sweep. The device also contains (Fig. 1) photo lens b, aperture 7. Between the lens 6 and the disk 3 is installed a mask 8 with a slot 9 (in Fig. 3 the slot in the mask is shown by a dotted line).

The device contains two photodetectors, the first photodetector 10 is installed in front of the aperture of the diaphragm 7, the second 11 is located between the disk 3 and the mask 8. The output of the photodetector 10 is connected to the first driver 12 pulses, the output of the photo receiver 11 is connected to the second driver 13 pulses.

The first pulse generator 12 is connected to a circuit consisting of the first three-input element AND 14, the first pulse counter 15, the memory register 16, the indicator 17, in series. The device also contains a chain of the second three-input element And 18 sequentially connected, the second pulse counter 19, the decoder 20, two-input element And 21. To the second driver 13 pulses connected control unit 22, the first output connected to the inputs of the zero setting of the first 15 and second 19 pulse counters, the second with the second the input of the two-input element And 21. To the first input of the first three-input element And 14 is connected to the generator 23 pulses. The output of the two-input element 21 is connected to the control input of the register 16 of the memory.

The device works as follows.

The light from the light source 1, the passage through the lighting system 2, falls on the measured product, for example, the wire 24. The passage further through the cutout in the rotating disk 3, the light enters the photodetector 11 and through the opening 4 in the disk 3, the slot 9 in the mask 8, the lens 6 and the aperture 7 - on the photodetector 10.

When the aperture 4 in the disk 3 moves, in the field of view of the lens 6, working pulses 25 of the photocurrent periodically appear at the output of the photoreceiver 10 (Fig. 2). In this case, the first “ejection corresponds to the moments of time from the beginning of the opening of the hole

0

five

about 5

0

five

0

five

4 in the field of view of the photographic lens 6 until the hole 4 crosses the shadow from the measuring wire 24. The depression corresponds to the time when the hole is in the shadow area, and the second ejection is from the moment the hole 4 emerges from the shadow area to the moment it leaves the field of view 6

Shaper 12 measuring pulses form rectangular pulses 26 in each measurement cycle (Fig. 2), the leading and trailing edges of which correspond to the moments before and after crossing the shadow of the wire from the disc hole.

The second pulse shaper 13, connected to the second photodetector 11, generates a pulse 27 of the field of view of the lens (Fig. 2). In order to obtain it, a cutout was made in disk 3 (Fig. 3). The cutout and the hole in the disk are oriented when fabricated relative to each other so that the pulses 25 of the photocurrent of the photodetector 10 and the pulses 28 of the photoreceiver 11 overlap (Fig. 3). Since the cut-out in the disk has a significantly larger area compared to the hole, the size of which significantly affects the level of the photocurrent pulse and the accuracy of the meter as a whole, the photocurrent impulse of the photodetector I immediately has a large amplitude, significantly exceeding the level of interference. In order for the light flux, the passage through the notch, to act on the photodetector 10, the lens 6 is covered by a mask 8 in which there is a slot 9 opposite which the opening 4 in the disk 3 is located. The duration of the pulse 27 determines the duration of the measurement cycle. The output pulses from the formers 12 and 13 pulses provide a connection through pulse And 14 of the output of the generator 23 pulses to the input of the pulse counter 15 for the duration of the measuring pulse. As a result, the counter 15 records a number proportional to the duration of the measuring pulse, and consequently, to the diameter being measured. This result, at the command of element 21, is rewritten into memory register 16 and recorded in indicator 17.

The measuring pulse through the element 18 in each measurement cycle is recorded in the pulse counter 19. The decipher 20, designed to determine the state of the counter 19, allows the switching of the measuring pulses to the input of the counter 19 in each measurement cycle.

The control unit 22 contains a differentiating circuit and generates two pulses 29 "Setting on the leading edge of the input signal) and" Census (on the falling edge).

At the beginning of the measurement cycle, the pulse "The installation of the control unit 22 sets the counters 15 and 19 to the zero state. Element 14, when a measuring pulse is generated from the pulse generator 12, opens and connects the pulse generator 23 to the counter 15 for the duration of the measuring pulse. Simultaneously with the arrival of the measuring pulse, the counter 19 is written "1, the state of the decoder 20 does not change. At the end of the measurement cycle, control unit 22 generates a signal "Overwrite, which passes through element 21, and the number

cutting between a disk and a photo lens, a photo sensor, optically associated with a photo lens, a pulse shaper connected to the output of a photo receiver, an indicator characterized in that, in order to improve measurement accuracy by increasing noise immunity, the scanner disk is cut with a periphery, the device is equipped with a second photodetector installed

recorded in counter 15 is rewritten in 10 between the mask and the scanner disk,

a chain from a series-connected three-input element And, a pulse counter, a memory register, a chain from a series-connected second three-input element And, a second pulse counter, a decoder 16 of the memory and is fixed in the indicator 17.

When a disturbance pulse appears in the measurement cycle, the counter 19 will write the number greater than 1, the output state of the decoder 20 will change, and the element 21 will turn out to be the second, two-input element And the second with the signal closed by the pulse converter, manager

A record in the memory register 16 and in the indicator 17 the result of the previous measurement is stored. At the beginning of the next cycle, counters 15 and 19 will be reset to their original zero state.

Thus, in the process of measuring

20

No, the pulse generator, the output of the pulse generator is connected to the first input of the first three-input element And, the output of the first pulse shaper is connected to the second inputs of the first and second three-input elements And, the second pulse shaper is connected by the input to the second photodetector, the output to the third inputs of the first and second three-input 25 And elements and the input of the control unit, the first output of which is connected to the inputs of the installation "On the first and second pulse counters, the second - to the second input of the two-input element And, Exit nous excluded consideration of pulses corrupted by interference ( "crushed), and this device is provided immunity.

Claims (1)

Claims of Invention Photopulse diameter gauge. No, the pulse generator, the output of the pulse generator is connected to the first input of the first three-input element And, the output of the first pulse shaper is connected to the second inputs of the first and second three-input elements And, the second pulse shaper is connected by the input to the second photodetector, the output to the third inputs of the first and second three-input 25 And elements and the input of the control unit, the first output of which is connected to the inputs of the installation "On the first and second pulse counters, the second - to the second input of the two-input element And, Exit latter is connected to the control containing a light source, an illuminating 30 memory register input, the output of the second counting system, a scanner in the form of a disk of pulse pulses connected to the first input by a hole, kinematically connected with the second three-input element I, and with an electric drive, a photo lens, a mask with a protractor connected to memory register output. Figg cutting between a disk and a photo lens, a photo sensor, optically associated with a photo lens, a pulse shaper connected to the output of a photo receiver, an indicator characterized in that, in order to improve measurement accuracy by increasing noise immunity, the scanner disk is cut with a periphery, the device is equipped with a second photodetector installed a chain from a series-connected three-input element I, a pulse counter, a memory register, a chain from a series-connected second serial three-input element And, a second pulse counter, a decoder, a two-input element And, a second pulse shaper, a control unit 0 No, the pulse generator, the output of the pulse generator is connected to the first input of the first three-input element And, the output of the first pulse shaper is connected to the second inputs of the first and second three-input elements And, the second pulse shaper is connected by the input to the second photodetector, the output to the third inputs of the first and second three-input 5 And elements and the input of the control unit, the first output of which is connected to the inputs of the installation "On the first and second pulse counters, the second - to the second input of the two-input element And, POVIDA exit FIG. J