SU1675780A1 - Instrument for measuring travel speed - Google Patents

Abstract

The invention relates to the field of measurement technology and can be used for non-contact measurement of the speed of movement of long objects. The purpose of the invention is to increase speed. The speed of a long object is measured using a charge-coupled device (CCD), a lens that focuses a part of the object's surface on the CCD, a marking device marking the object, and electronic modules that process the signal from the CCD when it appears in the field. image of the lens mark and calculating the speed of its movement over time, equal to 1 second, 2 sludge.

Description

The invention relates to a measurement technique and can be used for non-contact measurement of the speed of movement of long objects.

The purpose of inventions is to increase speed.

Figure 1 shows the structural diagram of the proposed device; figure 2 - plot of the signals at the output of the individual elements of the device.

The device contains a linear charge-coupled device (CCD) 1, lens 2, through which an image of a moving object section is projected onto the CCD side of the CCD generator, 3 clock pulses, the output of which is connected to a controllable CCD input, sequentially connected time sensor 4 interval and the detector of 5 edges, the first RS-flip-flop 6, the S-input of which is connected to the output of the edge detector, and the output is connected to the generator input of 3 clock pulses, the amplifier 7 of the output signals of the CCD connected to the output of the CCD, driver 8 pulse End of readout, the input of which is connected to the generator output of 3 clock pulses, and the output to the R input of the first RS-trigger 6 and the R input of the second RS flip-flop 9, the S input of which is connected to the output of amplifier 7, the counting trigger 10, the input of which is connected to the detector output of 5 edges, the first 11 and second 12 elements I, the first inputs of which are combined and connected to the generator output 3 clock pulses, the second inputs to the output of the second RS flip-flop 9, and the third inputs are separately connected respectively to direct and inverse outputs of the counting trigger 10. Us The device also contains a third element AND 13, the first input of which is connected to the inverse output of the counting trigger 10, the second input - with the output of the driver 8 of the End-of-read pulse, a reversible counter 14, the summing input of which is connected to the output of the first And 11 element, and the subtracting input to the output second eleo

XI SL VI SO O

And 12, the memory register 15, the control of which is connected to the output of the third element 13 and the input to the output of the reversible counter 14, the speed calculator 16 connected by its input to the output of the memory register 15, the counter 17 whose input is connected With the output of the second element AND 12, the block 18 of the task of the boundary of the field of vision, the comparison block 19, the first and second inputs of which are connected respectively to the output of the code setting block 18 and to the output of the counter 17, the label block 20, the controlled input which is connected to the output of the block 19 comparisons.

The device works as follows.

In the initial state, the triggers 6, 9 and 10, the reversible counter 17 are zero, the signal from the sensor 4 of the time interval is absent. When a pulse U4 appears at the output of sensor 4 (Fig. 26) with a duration of 1 s, the detector of 5 fronts on the leading edge (time ti) generates a short pulse Us, under the action of which the first RS flip-flop 6 and counting flip-flop 10 are set to one state (diagrams of signals Ue, Uio). Setting the trigger 6 to a single state allows the 3 clock pulse generator to begin to generate current pulses from those arriving at the controlled input of the CCD 1. Under the action of these clock pulses, the charge packets accumulated in its cells are sequentially pushed out to the CCD output. At the same time, the clock pulses from the output of the generator 3 are fed to the first inputs of the three-input elements 11 and 12 and to the input of the driver 8 of the pulse. Due to the fact that the second RS flip-flop 9 is at this time in the zero state, the clock pulses through the elements 11 and 12 to the inputs of the reversible counter 14 do not pass.

When the CCD output information of the cells on which the image of the surface of the object without the label was projected, the output of the amplifier 7 produces pulses U, the amplitude of which is insufficient to switch the RS flip-flop 9. When the CCD information is input to the output of the CCD line the image of the contrast mark is projected; a pulse of sufficient amplitude is formed at the output of the amplifier 7. Under the action of this pulse, the trigger 9 is set to the unit state Ug, thereby permitting the passage of the clock pulses Un through the first element 11 and the summing input of the reversing counter 14.

With the arrival of 8 pulses at the input of the generator. The end of the readout — n pulses. A pulse Ue is formed at its output, which sets the first 6 and second 9

RS-triggers to the zero state, thereby prohibiting the generator 3 to generate clock pulses. The readout of information from the linear CCD is completed, the output of the reversible counter 14 will be fixed

the code corresponding to the number of cells in the n-k range.

With the arrival on the S-input of the first RS-flip-flop 6 short pulse generated by the detector 5 fronts on the falling edge

pulse generated by the sensor 4 time interval (time ta), the operation of the device is similar to that described. The difference is that the pulse from the output of the detector of 5 fronts counting trigger 10 from the single state switches to the zero state and thereby allows the passage of clock pulses Ui2 from the output of the generator 3 through the second element 1/1 12 from the subtracting input

reversible counter 14. Due to the reading of the object at the moment of time t2, the label projects to the m-cell of the CCD. Consequently, .a subtracting input of the reversible counter 14 receives a burst of clock pulses, the number of which is equal to n-m. As a result, at the output of the reversible counter, an odd is formed corresponding to the movement of the image of the mark along the CCD photosensitive area from the cell to the m cell for a time interval equal to t2-ti 1 s. This code is rewritten into register 15 of memory by a pulse. End of the readout coming from the output of the imager 8 pulses per control input

the memory register through the third element And 13. From the output of the memory register 15, the code enters the computer 16 which calculates the speed of the object by the formula

 (m -k) AI-MS

45

where (m-k) is the number of CCD cells traversed by the label along the light-receiving area during time t;

C-1 s - measurement; AS — The length of the CCD cell is determined by dividing the length of the CCD light-receiving platform by the number of cells; M0 is the scale of the optical transfer of the image of the working surface of the object to the light-receiving area of the CCD.

When the tag reaches the end of the field of view of the lens 2, the marking device 20 places a new mark at the beginning of the border of the view of lens 2. The control unit of the tag 20 is controlled by the comparison unit 19, the first input of which receives the code of the field of view of the lens from block 18 and not the second input counter code 17, corresponding to the actual position of the mark in the field of view of the lens 2.

Claims (1)

When the time interval of the next pulse appears at the output of sensor 4, the speed measurement process is repeated. Apparatus of the Invention A device for measuring the speed of an object, comprising an objective, in the focal plane of which, along a direction of movement, a linear photosensitive device with a charge coupling (CCD) is installed, a clock pulse generator, the output of which is connected to the input of the device with charge connection, implying that, in order to improve speed, a pulse driver, the first and second RS-triggers, the counting trigger, the first, second and third elements of AND, the reversing counter, the memory register, have been entered into it tele, code setting block, counter, comparison block, tag block, edge detector, time interval sensor, the output of which goes to the edge detector, and from its output to the T input of the counting trigger and the S input of the first RS trigger, whose input is connected with the output of the pulse former, and the output of the first RS trigger is connected to the input of the clock pulse generator, the output of which is connected to the input of the inverter with a charge coupling to the first inputs of the first and second elements And and the input of the pulse former, the CCD output is connected to the amplifier input out D of which is connected to the S input of the second RS flip-flop, whose input is connected to the output of the pulse former, and the output of the second RS flip-flop is connected to the second inputs of the first and second I elements, the forward output of the counting trigger I, and inverse output with the third inlet of the second element I and the first input of the third element I, the second input of which is connected to the output of the pulse former, the summing input of the reversing counter is connected to the output of the first element I, the subtracting input to the output of the second element I, the output of the reversible counter is connected to the first input of the memory register, the second input of which is connected to the output of the third element I, and the output is connected to the output of the calculator, the first input of the ornsnench block is connected to the output of the code setting block, the input of which is connected to the output of the second element I, and the output of the comparison unit is connected to the input of the tag unit. Field of vision 1G 1  The position of the arr. tags