SU1615618A1 - Device for measuring speed of movement - Google Patents

Abstract

The invention relates to a measurement technique and can be used to measure the linear velocity of movement of objects moving along a predetermined path. The aim of the invention is to increase the reliability of measurement results. The device contains a sensor 1, a comparator 2, delay elements 3-7, a controlled voltage source 8, an element EXCLUSIVE OR 9, elements AND 10.11, trigger 12, time delay elements 13.14, one-shot 15, counter 15, calculator 17. Due to the connection of the comparator and the controlled source of the reference voltage, relaxation oscillations occur at the output of the comparator, which simultaneously signal the performance of the sensor-comparator line and are clock pulses for the entire circuit. These pulses are counted during the time of interaction of the object with sensor 1 in the counter 16, and then the number of pulses is copied to the calculator 17, which determines the speed of the object of a known length over a known time interval. In the event of a failure in the sensor-comparator section, a signal appears at the output "Failure" of the device. 3 il.

Description

The invention relates to measuring the Noah technique and can be used to measure the linear velocity of objects moving along a given trajectory.

 The aim of the invention is to increase the reliability of measurement results.

FIG. 1 shows the structural cue of the device; in fig. 2 - controlled voltage source

3 of FIG. 3 timing charts

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 devices that

. A device for measuring the speed of locating (Fig. 1) contains a sensor, a comparator 2, five elements 3-7 of a scraper, a control source 8 of the reference voltage, an element SPLING-10 or 9, two elements AND 10 and a trigger 12, two elements Figures 13 and 14, one-shot 15, | c | etchik 16 and calculator 17.

The controllable source 8 of the reference voltage (FIG. 2) contains, for example, 2p, a switch 18, three sources -21 of the reference voltage, a delay element and an element 23. The device for measuring the speed of movement works as follows (3).

i In the initial state, the counter 16 is reset, and the memory of the calculator 17. contains the code corresponding to the length of the moving object. The trigger 12 is set to its initial state, which ensures blocking the output of the element AND, In the absence of an object in the area of the sensor 1 sensor DAT-comparator, there are noises emitted by production interference IJt and intra-electronic circuits.

Comparator 2 settings using reference voltage sources 19–21 (ION) are selected in such a way that the first Up and second U setpoints correspond to the minimum and maximum noise levels, and the third setpoint ke: UQJ exceeds the value of the information signal from the object.

When there is no object in front of the date-1, the comparator 2 switches from high to low level of the output voltage and vice versa as follows. If the comparator 2 has a high level on the input of the comparator 2 (FIG. 3, point XI), which corresponds to a low setting level (before this, a low level of output voltage), then

43

41

31

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20

0

five

15

five

0

five

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time with ,, set by the first 3 delay detritus, this level is at the output of the controlled ION (UION) 8 (Fig. 3, X2) and it will switch from a low setting level IJ to level and 02, and the comparator will return to its initial state (fig. 3, x2), at its output, the low voltage level is again low, which, after the first delay element 3 has passed through the time determined by this element, is passed at the input of the low voltage cross-section 8 (fig. 3, X ). After switching the PILER from Up, to and after the time specified by the delay element 22, the switch 18 switches to the next ION 21, to which the reference voltage U .. corresponds. The delay time of the element 22 is equal to half the delay time of the element 3, i.e. / 2. The switching time of the switch inputs from ION-20 to ION 21 is i), / 2. ION 19 is selected with code 00, ION 20 with code 10, ION 21 with code 11.

Thus, the device continuously detects relaxation oscillations at the output of comparator 2. The signal systems at the input and output of the AND 10 and EXCLUSIVE OR 9 elements are out of phase with each other, in the initial state, therefore, at the output of the And 11 pulses not passed since the AND element 10 does not work and does not install the trigger 12.

. When a signal appears at the output of sensor 1, the comparator 2 does not go to the initial state after setting the level of the output of PIONE 8 (FIG. 3, X7) and at the output of the EXCLUSIVE OR 9 element a logical zero is formed, and at the output of the AND 10 - a logical unit ( Fig. 3, X6), which cocks trigger 12, and subsequent pulses from the output of element 9 are transmitted through element 11 to the input of counter 16, accumulating in it as pulses of the reference frequency, to measure the time interval. At the same time, after each counting pulse of the counter 16, the trigger 12 is reset via the third delay element 5. Counting lasts as long as the signal from sensor 1 exceeds the setpoint level.

and

(1 comparator 2. In this case, the counter 16 measures the time of interaction of the object with the sensor 1. The reset signals of the trigger 12 continuously reset the second exposure element 14, the exposure time of which is slightly longer than the delay time of the element 3. At the end of the pulse, sensor 1 (FIG. 3, X13) the formation of counting pulses in the counter 16 is stopped, and after the second time delay element 14 is triggered, the leading edge of this signal, separated by the single vibrator 15 and delayed by the fourth delay element 6, strobes the recording of the state of the counter 16 to numerator 17, where the speed of the object is determined by the formula

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and at

)

where a is the size (.plpna) of the object;

D t is the interaction time of sensor 1 and the object.

After the time specified by element 7, the counter 16 is reset, and the device is ready for the next measurement cycle.

If the device operates at the output of the EXCLUSIVE OR 9 element by wil low level signal (Fig. 3, XI6) for a time longer than 2 hours}, then the first time delay element 1 is triggered, and at the device failure code, a health signal appears devices.

Formula of the invention A device for measuring the speed of movement, comprising a sensor, a counter, two AND elements and a calculator, the input of which is connected to the output of the counter, and the output is the information output of the device, while the counter input is connected to the output of the first AND element, different

ten

15

20

25

35

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In order to increase the db of the accuracy of the measurement results, it contains a comparator, a controlled voltage source, five delay elements, two time delay elements, a one-shot, an EXCLUSIVE OR element, and a trigger, while the output of the sensor is connected to the first input a comparator, the second input of which is connected to the output of a controlled voltage source, the input of which is connected to the output of the first delay element and to the input of the second delay element, while the comparator output is connected to the input of the first element delays and with the first inputs of the EXCLUSIVE OR element and the second AND element, the second inputs of which are connected to the output of the second delay element, and the output of the EXCLUSIVE OR element is connected to the first input of the first AND element and to the input of the first time delay element, the output of which is an information failure output device, while the second input of the first element And is connected to the trigger output, the installation input of which is connected to the output of the second element And, the first reset input is connected to the output of the third delay element, in One of which is connected to the output of the first element I and to the input of the second element of the time delay, the output of which is connected to the input of a single vibrator, the output of which is connected to the input of the fourth delay element, the output of which is connected to the recording input of the calculator and through the fifth delay element to the first reset input the counter, while the second reset inputs of the trigger and the counter are connected to the device setup input in the initial state.

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Claims (1)

SUMMARY OF THE INVENTION 35 A device for measuring the speed of movement, comprising a sensor, a counter, two AND elements, and a calculator, the input of which is connected to the output of the counter, and the output is informational 40 {the output of the device, while the input of the counter is connected to the output the first element And, characterized in that, in order to increase the reliability of the measurement results, it contains a comparator, a controlled voltage reference source, five delay elements, two time delay elements, a single vibrator, an EXCLUSIVE OR element and a trigger, when ohm, the output of the sensor is connected to the first input of the comparator, the second input of which is connected to the output of the controlled reference voltage source, the input of which is connected to the output of the first delay element and to the input of the second delay element, while the output of the comparator is connected to the input of the first delay element and to the first inputs of the element The EXCLUSIVE OR and the second AND element, the second inputs of which are connected to the output of the second delay element, the output of the EXCLUSIVE OR element being connected to the first input of the first AND element and to the input of the first a time delay element whose output is data output failure. device, wherein the second input of the first element And is connected to the output of the trigger, the installation input of which is connected to the output of the second element And, the first reset input is connected to the output of the third delay element, the input of which is connected to the output of the first element And and the input of the second exposure element time, the output of which is connected to the input of a single-shot, the output of which is connected to the input of the fourth delay element, the output of which is connected to the recording input of the computer and through the fifth delay element to the first input of the counter reset, when m second inputs of the reset flip-flop and a counter connected to the setting input device to its original state.