SU1562700A1 - Magnetostriction transducer of displacements - Google Patents

Abstract

The invention relates to the automation of production processes and relates in particular to devices that convert mechanical movements into a digital code. The purpose of the invention is to improve the noise immunity of the converter due to the provision of differential delay of the pulses during radiation. The circuit solution provides a differentiated delay of pulses during radiation and a comparison of the reception times of the corresponding pulses during reading. This virtually eliminates the passage of noise into the converter circuit. 2 Il.

Description

The invention relates to the automation of industrial processes, in particular, to devices that convert mechanical movements into a digital code.

The aim of the invention is to improve the noise immunity of the converter due to the provision of differentiated pulse delays during radiation.

Figure 1 presents the diagram of the Converter, figure 2 - timing diagrams.

The magnetostrictive displacement transducer contains a magnetostriction waveguide 1, placed at the ends of the dampers of 3 pulses with the amplifier input —former of 4 write pulses, with the K input of the RS flip-flop 5, with the start input of the counter 6 pulses, through the delay line 7 with the contact input of the first switch 8 and delay line 9 - with contact

the input of the third switch 10. The switch output 8 is connected to the input of the delay line 11 at time t, to the input of the first element 12 and to the input of the second element 13, the output of the delay line 11 is connected to the contact input of the second switch 14, the outputs of which are connected to the input of the first element And 12 and with the input of the amplifier-maker 4 write pulses, the output of the first element And 12 is connected to the contact input of the third switch 10, the output of which through line 15 of the delay is connected to the contact input of the fourth switch 16, the outputs of which s 4 to the input of the amplifier and to the input of the second AND gate 13, AND gate 13 input coupled to the control input of the memory register 17 and via line 18 to the delay time, minimal pulse arrival time from the reference generator 19 - 6 with counter momentum (L

owls, the generator 19 is connected to the counter 6, the output of the amplifier-former

20 read pulses are connected to the S-input of the RS flip-flop 5 and through the line

21 delays with the contact input of the first switch 8, the output of the RS flip-flop 5 is connected to the control inputs of the switches 8,10,14 and 16. The output of the amplifier-former 4 is connected to the write coil 22 with a permanent magnet 23, read coil 24 with a permanent magnet 25 is connected to the input of the read amplifier 20.

The Converter operates as follows.

When the generator 3 is turned on, it generates a pulse, going through the amplifier-shaper 4 of the recording to the radiation, at the same time it hits the K input of the RS flip-flop 5 and sets it to the logical O state, while this RS flip-flop 5 generates a pulse, sending it to the control inputs of all four switches 8, 10, 14 and 16, connecting the outputs of the second 14 and fourth 16 switches to the force 4, disconnecting, the inputs of the switches 10 and 8 from the element 12. At the same time moment the pulse from the generator 3 is fed to the input of the launch of the counter 6, which counts It emits the pulses of the reference frequency from the oscillator 19. The pulse from the oscillator 3, lingering on line 7, arrives at the input of the switch 8 and, similarly, via the delay line 9 to the input of the switch 10 and is delayed by time 11 and t / j. Accordingly, two pulses are received through the switches 14 and 16 to the amplifier-shaper 4 recording radiation. The emitted pulses have a fixed time delay — the first is without delay, the second is delayed by time t ,, and the third is delayed by time 1g. These pulses, having passed the distance X along the waveguide, induce an emf in coil 24 and arrive at the input of the amplifier 20 write pulses and then to the S input of the RS flip-flop 5, transfer it to the logical 1 state and simultaneously arrive at line 21 delays. The trigger 5 at the same time will generate a pulse that will install switches 14 and 16 so that they disconnect from amplifier 4 and connect respectively to elements-I 12 and 13, and the inputs of switches 8 and 10 will disconnect

ten

15

20

2700.

with from lines 7 and 9 delay. The input of the switch 8 is connected to the delay line 21, and the input of the switch 10 to the element 12.

A series of pulses going through the delay line 21, enters the input of the switch 8, passes through it to the delay line 11 and the inputs of the first element 12 and the second element 13. After passing line 11, the pulses go through the switch 14 to the input of the element 12, the first impulse of the incoming packet is delayed by time t and it coincides with the second impulse of the packet coming from the switch 8. In this case, the element 12 will send a pulse to the input of the switch 10, which passed through line 15 and through the switch

16, will be delayed by time tt, arriving at the input of element 13, it coincides with the last pulse in the packet coming from switch 8. Then element 13 forms a pulse going to delay line 18 and to the control input of the storage register

17. According to the incoming command (i.e., the pulse from the output of element AND 13), register 17 copies the number N in counter 6, which is proportional to the displacement measured. Impulse from the line

18, having arrived at the control input of counter 6, will reset it to the zero state. The conversion cycle is completed and can be repeated first when a new pulse arrives from generator 3.

The advantage of the transducer is that the interference pulse will not be read, since the interference pulses with a very low probability can follow each other with an interference

thirty

35

40

terms of time t

one

-one

Time

45

50

55

delays t, tt are selected from a series of prime numbers (1, 3, 5, 7, 11, ...) to eliminate the effect of synchronous interference and Their harmonics.

Claims (1)

Invention Formula A magnetostrictive displacement transducer containing a magnetostriction sound guide with dampers at the ends, a pulse generator connected in series, a recording pulse driver and a recording coil with a permanent magnet a permanent magnet reading coil mounted along the sound guide, connected to it a pulse amplifier readout, a trigger whose inputs are connected to a pulse generator and a read pulse amplifier, the first delay line connected a read pulse amplifier and a register, characterized in that, in order to improve noise immunity, it is equipped with at least two signal conditioning units, a second delay line, a reference generator and a pulse counter, each of the signal generation units includes a first switch connected in series , - the second switch and element And the fourth delay line, the input of which is connected to the output of the pulse generator, and the output with the second input of the first switch, the second output of the second com the mutator is connected to the corresponding input of the amplifier-former n 25 B U write pulses, and the control inputs of the switches are connected to each other, the inputs of the pulse counter are connected to the pulse generator, the second delay line and the reference generator, and the output is connected to the register, the information input of the first switch of the first signal conditioning unit is connected to The Q output of the first lane line, the control inputs of the switches are connected to the trigger output, the output of the AND element of each signal conditioning unit, except the last one, is connected to the third 5 by the input of the first switch of the subsequent signal conditioning unit, the output of the AND element of the last signal conditioning unit is connected to the input of the second delay line and the second input 0 registers, and the second outputs of the first switches of each signal conditioning unit, except the last one, are connected to the corresponding inputs of the elements AND of their own and the last signal conditioning units. 23 g / 5 / G one/ go L to-sh 1 2