SU1053124A1 - Device for measuring parameters of code wheel - Google Patents

Abstract

A DEVICE FOR MEASURING PARAMETER CODES containing a radiation source optically coupled through a series ... ..: ,, .., | 5 f /;., Cr7;,. The condensed indicator and controlled discs with a photo receiver block, the display unit, are designed so that, in order to simplify it, they have introduced comparators, a code decoder, a trigger, and an adjustment key. Nickname of the ethnostonic stresses, the first and second outputs of which are connected with. the first inputs of the comparators, the outputs of the comparators are connected to the codec decoder inputs, the outputs of which are connected to the trigger inputs, the trigger outputs are connected {w to the inputs of the display unit, the output of the photo receiver module is connected to the second inputs of the comparators, and the indicator disk contains two spacing reference slits with a width multiple of the division of the code track of the controlled Disk.

Description

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r / Set.0 The invention relates to automation and computer technology and can be used to determine the manufacturing quality of code disco high-precision photoelectric converters. A device is known for measuring the parameters of code discs using a measuring microscope 1. The disadvantages of this device are the great complexity of detecting defects in the code scale and the subjectivity of their evaluation due to the large number of divisions. The closest to the invention of the technical essence is a device for measuring the parameters of the code disks, which contains a radiation source optically connected through successive capacitors, Id-controlled and controlled disks with a photodetector unit, the outputs of which are connected to the display unit - oscilloscope 2. The disadvantages of the known device. Wah are its complexity and subjectivity in assessing the quality of code LISKS. I The purpose of the invention is to operate a device for measuring the parameters of the code disks. The goal is achieved by the fact that a device for measuring parameters of code disks containing a radiation source, optically connected through a sequentially placed condenser, indicator and controlled disks with a photodetector unit, a display unit, a comparators, a code decoder, a trigger and a source of reference voltages first and The second outputs of which are connected to the first inputs of CC 4parators, the outputs of the Comparators are connected to the inputs of the descrambler | and the code whose outputs are connected to the trigger inputs, the trigger outputs are connected to the inputs, the display, the output of the photodetector unit is connected to the second inputs of the comparators, and the indicator disk contains two reference spaces spaced in spaces that are a multiple of the division of the code track of the controlled disk. The proposed device makes it possible to evaluate the qualities of the code disks by two indicators separately; in terms of permissible uniform and uneven changes in the quantum of division of the code scale, since both of these indicators have a different effect on the conversion accuracy in the photoelectric {converter. Fig. 1 shows a block diagram of the device, which makes it possible to measure allowable uniform changes in the division step of the code track of the disc under control; Fig. 2 is the same, allowing for the measurement of permissible non-uniform changes in the step division of the code track; FIG. 3, the low-order code tracks of the controlled discs of FIG. 4 controlled disc with the relative position of the reference reading slits made on the indicator disc; in fig. 5 - diagrams of signals explaining the operation of the device. The device contains a shaft 1, a radiation source 2, a condenser 3, an indicator disk 4, a controlled disk 5, a unit of 6 photodetectors, comparators 7 and 8, a code decoder 9, a trigger U, an indication unit 11 and a source 12 of reference voltages, photodetectors 13 and 14 and reference slots 15 and 16. The device (Fig. 1) works as follows. When the shaft 1 younger is turned, the track of the code scale of the controlled disk 5 moves relative to the reference slit 15 of the indicator disk 4, the width of which is a multiple of the division step of the code track. The luminous flux from the radiation source 2 transmitted through the capacitor 3 is formed by the standard slit 15 into the reading beam with a width multiple of the division of the code track, part of which, passing through the transparent sections of the code track, falls on the sensitive surface of the photodetector 13 of the photodetector unit 6. If the code of the lowest-order bit in the tested sample of the code has equal and transparent and opaque areas (Fig. For the ideal case), then the output of the photo-receiver 13 generates a signal 17 (phmg. 5) in the form of a constant level "If, however, the code tracks for the sample to be tested are evenly expanded (FIG. 36) or narrowed (FIG, Sv), then the radiant flux incident on the photodetector 13 increases accordingly, which leads to an increase in the signal level 17 to the UK value ( Diagram “4a 18) or lowering it to the UH value (diagram 19), Constant signal level (diagrams 17 - 19) at the photodetector output. 13 is due to the fact that when the code track is moved, the total radiant flux incident on the photodetector 13 remains constant and is not modulated by the divisions of the code track due to the width of the reference track 15 or the width of the division step of the code track. Therefore, to analyze the magnitude of the signal level, it is not necessary to impose requirements on the movement of the code track. If, on the other hand, the tested samples of the code scales have areas containing lepaB numerical changes of the quantum divisor (Fig. 3g), then the radiant flux incident on the photodetector 13 is modulated by areas of the code track, which leads to a change in the constant signal from Ug to n at the output of the photodetector 13 (figure 20). From the output of the photoreceiver 13, the signal is supplied to one input of the comparators 7 and 8, to the other inputs of which 12 reference voltages are supplied from the source, the reference levels, respectively U, and. And the voltage values U, and Dy correspond, respectively, to the maximum (Allowed expansion and contraction If the even-dimensional expansion or contraction of the code-division quantum is greater than the allowable value, a signal with an amplitude either exceeding the reference level U or not is generated at the output of the photodetector 13 walking up to the reference level Uo, which triggers., tori 7 or 8. At the moment the comparators are triggered, a signal is generated at the output of the code decoder 9. The signal sets the short-circuit trigger Yu to state i, which indicates the expansion or narrowing of the quantum of division The code scale track is larger than the allowable value. This state is indicated by the indication block I. Prior to the measurement, the ns trigger 10 is set to zero. To measure the amount of expansion and contraction of the code division division quantum, alternately changing the Uf and Uf operation levels Qpaba is achieved, respectively, of Comparators 7 and 8. The ratio of Comparators 7 and 8 versus Ug determines the maximum expansion or contraction of the code-division division quantum, and the magnitude of the difference between the comparators trigger levels determines the amount of uneven variation of the code-division division quantum. To simplify the selection of a variable, a constant level component, a signal and create a light-gage. ra, increasing the efficiency of the assessment (Fig, 2), additionally use the second reference slit 16 (Fig.4) and the photodetector 14 (Fig. 2) corresponding to this slit, f | receiver 13 and 14 connect mets a differential so that at their outputs only the difference signal is generated. i. The variable component of the signal is selected, which gives information about the unevenness of the change in the quantum of division of the code scale. These reference slots are located relative to each other in space, taking into account the characteristics of the unevenness of the manufacture of a code scale, due to its technology. The device (Fig. 2) works as follows. The difference signal 22 from the outputs of the photodetectors 13 and -14 of the block 6 of the photoreceivers is fed to one of the inputs of the comparators 7 and 8, to the other inputs of which 12 reference voltages are supplied from the source, reference levels (J -U, Tse value corresponds to the maximum allowable change With a uniform change in the division quanta of the code track (Fig. Pros, b, c), the outputs of photodetectors 13 and 14 generate signals with equal amplitude and with the opposite sign, which leads to the formation of a different signal with zero If the checked sample of the code scale (Fig. 3g) has an uneven change in the fission quantum, then the outputs of the Photoreceivers 13 and 14 generate signals 21 and 22, the resulting signal of which has an amplitude of / and $ - OH / (diagram 23), where Ug is the amplitude of the signal corresponding to the area of the code track with the maximum expansion of the transparent portion of the dividing quantum; Cc is the amplitude of the signal corresponding to the area of the code strip with the maximum narrowing of the transparent portion of the division quantum. If the non-uniformity of the change in the quantum of division of the code scale exceeds the permissible value, then. At the outputs of photodetectors 13 and 14, a signal is generated, the amplitude of which exceeds the set levels and - (i-. Comparators 7 and 8 are triggered and a signal is generated at the output of the decoder circuit 9 of the code, setting the RS-flip-flop 10 to the state indicated by the display unit 11. To measure the magnitude of the unevenness of the code scale, the controversial voltage level U is changed until the comparators 7 and 8 are triggered and judging by the magnitude of this voltage, an unequal number change of the code division division quantum ... In the proposed devices, the signal amplifiers fishing and stabilizer moschnoe-. whith radiation emitters conventionally not shown. Thus, it was possible to create a simple luminous gauge which improves the performance of quality assessment scales produced code 100 raz.l Economic benefit from the use of the device is determined by its technical capabilities of.

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Claims (1)

DEVICE FOR MEASURING CODE DISC PARAMETERS, containing a radiation source optically connected through a series of Ό> 3