SU1474842A1 - Real-time motion meter - Google Patents

Abstract

The invention relates to the field of automation and computer technology and can be used in real-time angular and linear displacement measurement systems, where the use of known measuring devices is impossible, for example, in third and fourth generation X-ray computed tomographs. The aim of the invention is to increase the information content while maintaining the number of position marks by dividing the interval between adjacent position marks into K equal intervals. The goal is achieved by the fact that the device containing the stationary position label carrier, the first position sensor, the first pulse shaper and the data acquisition and processing unit are additionally introduced a second position sensor and pulse shaper, three delay blocks, two triggers, a sum counter, two registers , subtracting counter, cycle counter, code comparison unit, four OR elements, three AND elements, a division code assignment bus and a control bus, a pulse generator and a controlled frequency divider. The introduction of a second position sensor allows using a pulse generator, a controlled frequency divider, a first delay unit, a summing counter and a first register to measure the actual travel time between two adjacent marks with high accuracy, which is then divided by signals from the main position sensor intervals using a subtracting counter, a code comparison block, a cycle counter, and two delay blocks, i.e. The initial data for multiplication in this interval is the previously measured, using the position sensor, the duration of the same interval. 1 il.

Description

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The invention relates to automation and computing and can be used in measuring systems.

neither angular and linear displacements in real time, use of known measuring

devices is impossible, for example in X-ray computed tomographs of the third and fourth generations.

The purpose of the invention is to increase informative ™ while maintaining the number of position marks by dividing the interval between adjacent position marks into K equal intervals due to the formation of K-1 positional pulses.

The drawing shows a block diagram of the device.

The device contains a stationary carrier 1 position labels, position sensors 2 and 3, shapers 4 and 5 pulses, block 6 for collecting and processing data, first to third delay blocks 7-9, generator

10 pulses, controlled divider

11 frequencies, summing counter 12, first 13 and second 14 registers, subtracting counter 15, counter 16 cycles, code comparison block 17, first

18 and second 19 triggers, first to fourth elements OR 20-23, first to third elements AND 24-26, the code setting bus 27 and the control bus 28.

The device works as follows.

In the initial state, the triggers 18 and 19 are in zero states (the values of the initial installation of the triggers 18 and 19 are not shown) and the zero potentials from the direct outputs of the triggers 18 and 19 block the counters 12 and 15, respectively.

On buses 27, a code of the number K is set, and on fault 28 there is a field-potential that confirms the zero state of trigger 19, the OR element 23, and blocks the passage of signals from the output of the driver 4 and the input of block 8 through the element AND 24 The generator 10 generates pulses quartz frequency, which is fed to the input of the divider 11, at the output of which pulses with a frequency of f / K appear, which are fed to the clock input of the counter 12, which counts these pulses,

After the scanning system begins to rotate, sensors 2 and 3 produce electrical signals when passing the corresponding marks of the fixed carrier 1 position marks, and these signals are generated on the formers 4 and 5, respectively.

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When a signal appears at the output of the imaging unit 5, time-shifted pulses appear on the first and fourth outputs of block 7. A pulse from the first output of block 7 sets in O a trigger 18, a zero signal from a direct output which prohibits the operation of the counter 12. On a signal from the second output of block 7, the contents of counter 12, which corresponds to the number of pulses with a frequency f / K received in the time interval between the previous and given signals from the output of the driver 5, is rewritten into register 13, on the signal from the third output block 7, the counter 12 is nullified and the signal from the fourth output of block 7 triggers 18 and is set to 1, thereby allowing counting of pulses with a frequency f / K by counter 12, which continues counting until the next pulse from the output of the imaging unit 5 and. At the initiation input of block 6, no pulses are received “

When the scanning system reaches the nominal rotational speed on the bus 28, a zero potential appears, which allows the arrival of pulses from the output of the imaging unit 4 to the input of the unit 8 through the And 24 element.

When each pulse arrives at the input of block 8, a signal appears first at its first output, through which register 14 is loaded with the contents of register 13, a 16-cycle counter is set to the initial state Yu = 0 (while at the output of block 17, code comparison there is a single potential that permits the passage of signals through elements (25 and 26). The pulse from the first output of the block 8 passes through the OR 20 element and enters the initiation input of the block 6, which controls the collection and processing of data from tomograph x-ray detectors rigidly connected to the fixed media 1 position marks (x-ray detectors and the x-ray source are not shown). The impulse from the second output of block 8 loads the subtractive counter 15 with the contents of register 14. The impulse from the third output of block 8 occurs

Trigger 19 is set to 1 through element 22, while the positive potential from the direct output of trigger 19 enables the counting of pulses with a frequency fgm by a subtractive counter 15 and the latter reaching the zero state at its output. The loan is a pulse signal that sets the trigger 19 the zero state, which leads to blocking of the counter 15, and enters the input of block 9. The pulse from the first output of block 9 increases by one the contents of the counter of 16 cycles and passes through the OR element 20 to the initiation input of block 6c. The counter 16 is not equal to the code on the tires 27, a single potential is saved at the output of block 17 and therefore the pulse from the second output of block 9 passes through the AND 25 and OR 21 elements and is fed to the load control input of the counter 15 which is loaded with the contents of the register 14. The signal c the third output of block 9 passes through the element AND 26, the element OR 22 and sets the trigger 19 to one and the operation of the counter 15 is enabled

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The described cycle repeats K-1 times. When a 9 K-1 pulse appears at the first flea output, counter 16 increases its content by one, which becomes K. At the output of block 17, there is a zero code comparison potential, which blocks elements 25 and 26, therefore, the pulses from the second and third outputs of block 9 of the counter 15 are loaded and the trigger 19 is not installed. The formation of the next K-1-s pulses by the counter 15 and the block 9 will occur only when the next pulse arrives from the form 4 body.

Thus, the device generates additional intermediate pulses at the initiation input of block 6 for each pulse from the output of the 4 K-1 generator, and the number in register 14 is the result of measuring the same angular interval with sensor 3, which ensures the distribution of the absolute error on all K positional intervals in the interval between two angular positions of the carrier 1 position marks.

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A device for measuring movement in real time, containing a fixed carrier of position marks, a first position sensor, rigidly connected to the movable part of the device, the output of which is connected to the input of the first forming a pulse body, a control unit for collecting and processing data By the fact that, in order to increase the informativity, while maintaining the number of position marks, a second position sensor is inserted in it, which is rigidly connected to the mobile part of the device and is separated from the first sensor one period and less than two periods of location of position labels on the carrier, second pulse shaper, pulse generator, controlled frequency divider, first to third delay blocks, first and second triggers, first to third elements AND, first to fourth elements OR, a summing counter, first and second registers, a subtracting counter, a code comparison unit, a cycle counter, a division reference / idle bus and a control bus, the output of the second position sensor is connected to the input of the second pulse former, the output of which It is connected to the input of the first delay unit, the first output of which is connected to the R input of the first trigger, the direct output of which is connected to the control input of the summing counter, the counting input of which and the zero input are connected respectively to the output of the controlled frequency divider and to the second the output of the first delay unit, the third and fourth outputs of which are connected respectively to the overwrite input of the first

register and S-input of the first trigger, the output of the first pulse shaper is connected to the first input of the first element And, the second input of which is connected to the control bus, and the output is connected to the input of the second block

delays, the first output of which is connected to the rewriting input of the second register, the S input of the cycle counter and the first input of the first OR element, the second and third outputs of the second delay unit are connected respectively to

the first inputs of the second and third elements OR, the outputs of the bits of the summing counter are connected to the bit inputs of the first register, the outputs of which are connected to the bit inputs of the second register, the outputs of which are connected to the bits in the outputs of the detracting counter, the overflow output of which is connected to the first Q input of the fourth OR element and the input of the third delay unit, the first output of which is connected to the second input of the first OR element and to the C input of the loop counter, the second 15 and the third outputs of the third delay unit with Dineny respectively with the first inputs of the second and third elements And, the second inputs of which are combined and connected to the output of the code comparison block, the output of the second element And connected to the second input of the second element OR, the output of which is connected to the rewrite counter override input, output The third element AND is connected to the second input of the third element OR, the output of which is connected to the S-input of the second trigger, the second input of the fourth element OR is connected to the control bus, and the output to the R-input of the second trigger, whose direct output connected to the control input of the detracting counter, the counting input of which is connected to the output of the pulse generator and to the input of the controlled frequency divider, the bit inputs of which are connected to the bus of setting the division code and to the first group of inputs of the code comparison unit, the second group of inputs of which are connected to the outputs of the counter cycles, the output of the first element OR is connected to the input of the control unit for collecting and processing data

Fixed carrier position labels

Claims (1)

Claim A device for measuring movement in real time, comprising a fixed carrier of position labels, a first position sensor rigidly connected to the movable part of the device, the output of which is connected to the input of the first pulse shaper, a data acquisition and processing control unit, characterized in that, for the purpose of increasing informativity · while maintaining the number of position marks, a second position sensor is inserted into it, rigidly connected to the moving part of the device and spaced from the first sensor at a distance greater than one of the first period and less than two periods of location of position labels on the carrier, a second pulse shaper, a pulse generator, a controlled frequency divider, first to third delay blocks, first and second triggers, first to third AND elements, first to fourth OR elements, summing counter, first and second registers, subtracting counter, code comparison unit, cycle counter, job bus. division year and control bus, the output of the second position sensor is connected to the input of the second pulse shaper, the output of which is inen with the input of the first delay unit, the first output of which is connected to the R-input of the first trigger, the direct output of which is connected to the control input of the totalizing counter, the counting input of which and the zeroing input are connected respectively to the output of the controlled frequency divider and to the second output of the first delay unit, third and the fourth outputs of which are connected respectively to the rewrite input of the first I register and S — input of the first trigger, the output of the first pulse shaper is connected to the first input of the first element And, the second input of which is connected to the control bus, and the output is connected to the input of the second delay unit, the first output of which is connected to the overwrite input of the second register, S- the input of the loop counter and the first input of the first OR element, the second and third outputs of the second delay unit are connected respectively to the first inputs of the second and third OR elements, the outputs of the bits of the totalizing counter are connected to the discharge inputs Dams of the first register, the outputs of which are connected to the bit inputs of the second register, the outputs of which are connected to the bit inputs of a subtracting counter, the overflow output of which is connected to the first input of the fourth OR element and the input of the third delay unit, the first output of which is connected to the second input of the first element OR and with the C-input of the cycle counter, the second 15 and third outputs of the third delay unit are connected respectively to the first inputs of the second and third AND elements, the second inputs of which are combined and connected to the output of the block is compared to 20 codes, the output of the second AND element is connected to the second input of the second OR element, the output of which is connected to the overwrite input of the subtracting counter, the output of the third AND element is connected to the second input of the third OR element, the output of which is connected to the S-input of the second trigger, the second input of the fourth OR element is connected to the control bus, and the output is to the R-input of the second trigger, the direct output of which is connected to the control input of the subtracting counter, the counting input of which is connected to the output of the pulse generator and to the input directs the frequency divider, bit inputs of which are connected to the bus assignment and code division the first group of input codes comparator unit, the second group of inputs of which is connected to the outputs of the loop counter, the output of the first OR element connected to the input of the control unit and collecting data "