SU1649661A1 - Magneto-strictive displacement-to-code converter - Google Patents

Abstract

The invention relates to a measurement technique and can be used to measure and control two-coordinate movements in automatic control and regulation systems. The aim of the invention is to expand the scope of the invention. The invention relates to measurement techniques and can be used to measure and control two coordinate movements in automatic control and regulation systems. The aim of the invention is to expand the field of application of the converter. Figure 1 shows a structural diagram of a magnetostrictive displacement transducer into a code; Fig. 2 shows an example of making sound pipes. educator To do this, a magnetostriction transducer containing the first acoustic duct, the first damper, the movable magnetic read head, the first excitation element, two pulse generators, R & trigger, the element And, the first pulse counter, the first amplifier forming, N, acoustic ducts, 2N-M dampers, N stationary excitation elements, two amplifier-formers, a demultiplexer, four delay elements, two pulse counters, two registers, an OR element, and a block of driver amplifiers. The goal is achieved due to the fact that the sound pipes are located in the plane of movement of the object being monitored. The location of the movable magnetic readout head is determined by the number of the acoustic conductor, which corresponds to the Y coordinate, and its location relative to the beginning of the acoustic ducts corresponds to the X coordinate. 1 Cpf, 2 ill. . The magnetostrictive displacement transducer to the code contains sound conductors 1, stationary excitation coils 2, stationary receiving coils 3, movable magnetic read head 4, gmmphers 5, permanent magnets 6 and 7, pulse generator 8, delay element 9, demultiplexer 10, pulse counter 11 , block 12 amplifier-formers, RS flip-flop 13, element I 14, generator 15 pulses, counters 16 and 17 pulses, registers § (L% & OE OE

Description

31

18 and 19, amplifier-formers 20-22, delay elements 23-25, and element OR 26.

Each stationary excitation coil 2 and corresponding magnet 6 form a stationary excitation element, and each stationary receiving coil 3 and corresponding

send a code to its address inputs; delay element 9 delays the passage of a pulse by the time required to establish a code at the control inputs of the demultiplexer 10 from the output of the pulse counter 11 pulses. All three delay elements 23-25 delay the passage of the signal for as long as necessary.

. 20

7 magnet. fixed member reads JQ coolable to trigger trigger 13

and element 14. The second impulse produced by the pulse generator 8, through the delay element 9, arrives at the second output of the multiplexer 10, then excites the ultrasonic wave in the second acoustic duct 1 of the transducer. The same pulse from the output of the generator 8 pulses leaves the trigger 13 in the unit state, zeroes the counter 16, writes the number 2 in the counter 17, then everything happens as above, provided that there is no magnetic head 4 above the second conduit 1 .

If the magnetic head 4 of the readout-t is not above any other than the last one, the sound duct 1, then the ultrasonic wave propagating along sound-conductor 1 induces an EMF pulse in it due to the reverse magnetostriction effect through time

vani „

The magnetostrictive displacement transducer to the code works as follows.

When the converter is turned on from the external circuit, a pulse is applied to the input. Starting the generator 8 pulses, which produces a current pulse. This current pulse through the delay element 9, the first output of the demultiplexer 10 and the block 12 of the amplifier-formers (recording pulses) enters the excitation coil 2 of the first sound conductor 1 of the converter. In the area of the first sound duct 1, which is located under the excitation coil 2, due to the direct magnetostriction effect, an ultrasonic wave is excited, propagating along the sound duct with velocity v

The pulse from the output of the generator of 8 pulses also translates the RS-flip-flop 13 into one state, embeds the counter of 16 pulses and writes the number 1 into the counted 17 pulses. When the flip-flop 13 is switched to one state, the element And 14 opens, the pulses from the generator 15 of pulses pass through the element 14 and are read into the counter 16.

If there is no magnetic head 4 associated with the object being monitored above the first sound pipe 1 of the transducer, then the ultrasonic wave passes its entire length, but at a speed v through time t a / v

and due to the reverse magnetostrictive effect, it induces a pulse of EMF in the receiving coil 3 of the same conductor 1 and fades. The induced pulse is amplified and formed by the amplifier driver 20, is fed to the inputs of the delay element 23 and, through the OR 26 element, starts the pulse generator 8 and is fed into the pulse counter 11 pulses. Since for switching the input of the demultiplexer 10 with a certain output, you must first

25

thirty

35

40

t x / v

t

where x is the distance traveled by the wave from the moment of excitation to the moment of reading in the magnetic head 4. This pulse through the amplifier-shaper 22 converts the trigger 13 to the zero state. As a result, the AND element 14 is closed and in the counter 16, N pulses are recorded, coming from a generator of 15 pulses:

45

N t, / T

where t 50

55

the period of the pulses generated by the generator 15 pulses.

The same pulse, delayed in delay delay element 25, for trigger time 13 and element 14, is fed to the synchronous inputs of registers 18 and 19. The code from counters 16 and 17 is recorded in registers 18 and 19 on the front of the pulse at their synchronous inputs. Register 18 stores information about the horizontal movement of the magnetic head, i.e. on coordinate X, and to reproduce the code at its address inputs, delay element 9 delays the passage of a pulse by the time required to establish a code at the control inputs of the demultiplexer 10 from the output of the counter 11 pulses. All three delay elements 23-25 delay the signal for the time required to trigger the trigger 13

. 20

t x / v

t

where x is the distance traveled by the wave from the moment of excitation to the moment of reading in the magnetic head 4. This pulse through the amplifier-shaper 22 converts the trigger 13 to the zero state. As a result, the AND element 14 is closed and in the counter 16, N pulses are recorded, coming from a generator of 15 pulses:

45

N t, / T

where t 0

five

the period of the pulses generated by the generator 15 pulses.

The same pulse, delayed in delay delay element 25, for trigger time 13 and element 14, is fed to the synchronous inputs of registers 18 and 19. The code from counters 16 and 17 is recorded in registers 18 and 19 on the front of the pulse at their synchronous inputs. Register 18 stores information about the horizontal movement of the magnetic head, i.e. about coordinate X, and register 19 - about its vertical displacement, i.e. on the Y coordinate. Then this wave induces an EMF pulse in the fixed receiving coil 3 of the same sound duct 1. This pulse passes through the amplifier-shaper 20 to the input of the delay element 23, then the pulse generator 8 starts through the OR 26 element, which produces the next pulse. Registers 18 and 19 store recorded information. The delay elements 24 and 23 have equal delay times with delay element 25 so that under what conditions the counter 17 does not zero and the pulse generator 8 starts before writing the Counters 16 and 17 code to the Regulator 18 and 19, the peculiarity is reading ultrasonic wave from the last sound line 1 transducer. In the absence of a magnetic head 4 over the last acoustic conductor in a fixed receiving coil 3, an EMF pulse is driven through time t after its excitation. It passes through the amplifier driver 21, is delayed in the delay element 24, enters the input of the OR element 26 and simultaneously zeroes the counter 17. Then this pulse starts the generator of 8 pulses and then everything repeats, starting with the first sound circuit 1

496616

the first sound conductor, on the first end of which the first damper is located, and opposite the second end — the first non-movable excitation element, a movable magnetic readout head, the output of which is connected to the first driver-amplifier, the output of which is connected to the R input of the RS flip-flop,

Yu output of which is connected to the first input element And, the first pulse generator, the output of which is connected to the second input of the element And, the output of which is connected to the counting input

15 of the first pulse counter, the second pulse generator, the output of which is connected to the installation input of the first pulse counter and the S input of the RS flip-flop, characterized in that

20 that, in order to expand the field of application of the converter, N sump ducts, 2N + 1 dampers, N stationary excitation elements, N + 1 stationary elements, count 25, two shaping amplifiers, a multiplexer, four delay elements, two pulse counters , two registers, an OR element and a block of driver amplifiers, the second pulse generator is controllable, the sound lines are located in the plane of motion of the object being monitored and parallel to each other,

If the magnetic head 4 is located, 5 wives of the second damper, at the ends of each

over the last conduit 1, the pulse of the EMF induced by the ultrasonic wave in the magnetic head 4 is amplified by the amplifier-shaper 22, sets the trigger 13 to the zero state, and And 14 closes. The same pulse, through Delay 25, writes the counter code 16 and 17 in registers 18 and 19.

The ultrasonic wave reaches the stationary receiving coil 3 of the last sound duct), induces an EMF pulse in it that passes through the driver former 21 and the delay element 24, wraps the counter 17, starts the pulse generator 8 through the OR 26 element and then from the first sound pipe 1.

Claims (2)

1. Magnetostrictive displacement transducer to code containing of the remaining sound ducts, there are dampers, opposite the first end of each sound duct there is a stationary read element, 40 opposite the second end of each sound ducts, except for the first one there is a stationary excitation element, the output of the stationary read element of the first sound duct is connected to 45 by the input of the second amplifier-amplifier, the output of which through the first delay element is connected to the first input of the OR element and the installation input of the second pulse counter, the outputs of the fixed readout elements of the remaining sound ducts are connected to the input of the third amplifier of the former, whose output is connected through the second delay element 55 frame the input of the OR element, the output of which is connected to the input of the second pulse generator and the input of the third pulse counter, the outputs of which are connected to the address inputs of the remaining sound ducts, there are dampers, opposite the first end of each sound duct there is a stationary read element, opposite the second end of each sound ducts, except the first one there is a stationary excitation element, the output of the stationary read element of the first sound duct is connected to the input of the second amplifier-former, the output of which through the first delay element is connected to the first input of the OR element and the installation input of the second pulse counter, the outputs of the stationary readout elements of the remaining sound ducts are connected to the input of the third amplifier-former, whose output is connected through the second delay element to the second input of the element OR, the output of which is connected to the input of the second re-pulse generator and the input of the third pulse counter, the outputs of which are connected to the address inputs the demultiplexer, the output of the second pulse generator is connected via a third delay element to the information input of the demultiplexer, the outputs of which are connected through a block of driver amplifiers to the inputs of stationary excitation elements, the output of the first shaping amplifier is connected to the register recording inputs of the second pulse generator with the counting input of the second Launch Y pulse counters, the outputs of the first and second pulse counters are connected to the information inputs of the respective registers, the outputs of which are the outputs of the converter. 2. The transducer according to claim 1, which is characterized by the fact that, in order to increase the accuracy of the transformation along the Y coordinate, the even sound conductors are installed with a longitudinal displacement relative to the odd sound wires.  one: Op.1 cm svb w ////// Amzz. Ш ШУ ////, TL CmCm a  P. shshsht / A Plane KOHfTjpo / fff moving jCv cm cm D X CD § t -T Kloku Phage2