SU1712911A2 - Magnetic induction digital meter - Google Patents

Abstract

The invention relates to a technique of magnetic measurements and can be used with a fly-type coil. For precision measurement in a wide dynamic range of induction of constant magnetic fields. The goal — an increase in the measurement accuracy — is achieved by introducing into the device two groups of elements 2–2–2 – ZYLI 8.9. register 11, trigger 1, element 15 and binary decimal decoder 13. The device also includes a sensor Ho 1 la, a current stabilizer 2, a digital reading device 12, a power source 4, a inductor 3, 3 code 5, dividing unit 10, i reversible counter 6 and control unit I 14. 1 ill. i ^ v ^ "fe

Description

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The invention is in addition to avt.sv, No. 347704, relates to the field of magnetic measurements and can be used for precision measurements in the luwpOKOM dynamic range of induction of constant magnetic fields,

The aim of the invention is to improve the measurement accuracy.

The drawing shows a block diagram of a digital magnetic induction meter.

A digital magnetic induction meter consists of a Hall sensor 1, a current stabilizer 2, an induction coil wound on a Hall sensor, a coil 3, a power source 4, a voltage-code converter 5, a reversing counter 6, a reverse trigger 7, groups of elements 2-2-2I - ZILI 8.9, divider unit 10. register 11, digital cut-off device 12, binary-decimal device 12, binary-decimal decoder 13, control unit 14 and AND 15 element.

The control unit 14 consists of a pulse generator 16, the element And 17, the counter 1R. The element OR 19, the trigger 20, the element OR 21, the switches 22, 23 and the decoder 24.

The current electrodes of the Hall sensor 1 are connected to a current stabilizer 2. The potential electrodes of the Hall sensor 1 are connected to a voltage-code-5 signal input of the transformer. The coil of the induction coil 3 is connected to a power source 4. The code output of a voltage-five code converter is connected to the first input of the group elements 2-2-2I-ZIL1 / 1 8. The output of the counting pulses of the voltage converter code 5 is connected to the counting input of the reversible counter 6. The input of the reverse of the reverse meter b is connected to the output of the reverse trigger 7. The counting input is trig Hera reverse 7 is connected to the output element And 15.

The code output of the reversible counter 6 is connected to the second input of a group of elements 2-2-2AND-ZILI 8, with the input of an element I 15 and with the first and second inputs of a group of elements 2-2-2I-ZILI. The third input of a group of elements 2-2-2-ZILI 8 is connected to the output of register 11. The output of a group of elements 2-2-2-ZILI 8 (parallel code) is connected to the first input of the division unit 10, the second input of which (parallel code) is connected to the output of the group of elements 2-22 and ZILI 9. The third input (parallel code) of the group of elements 2-2-2 and ZILI 9 is connected to the output of the division unit 10, the input of the register 11, and the input of the binary-decoding decoder 13. The output of the binary dec a real decoder 13 (parallel code) connect;

it with the input of the digital residual device 12,

The first output of the control unit 14 is connected to the control input of the source 4.

The second output of the control unit 14 is connected to the control input of the reversible counter 6. The third output of the control unit 14 is connected to the triggering input of the voltage-code converter 5. The fourth

the output of the control unit 14 is connected to the first control input of the group of elements 2-2-2-ZILI B. The fifth output of the control unit 14 is connected to the second control input of the group of elements 2-2-2IZILE 8. The sixth input of the control unit 14 is connected to the third control input of the group of elements 2-2-2 and ZILI 8. The seventh output of the control unit 14 is connected to the control input of the register 11. The eighth

the output of the control unit 14 is connected to the zero (setting) input of the register 11. The ninth output of the control unit 14 is connected to the zero (setting) input of the division block 1-0. The tenth output of the control unit 14 is connected to the division input of the division unit 10. The eleventh output of the control unit 14 is connected to the control input of the element A 15. The twelfth output of the control flea 14 is connected to zero

the trigger input of the reverse 7. The thirteenth output of the control unit 14 is connected to the single input of the trigger of the reverse 7. The fourteenth output of the control unit 14 is connected to the first control input

group of elements 2-2-2 and ZILI 9, the fifteenth output of the control unit 14 is connected to the second control input of the group of elements 2-2-2 and ZILI 9. The sixteenth output of the control unit 14 is connected to

the third control input of the group of elements 2-2-2ИИ-ЗИЛ1 / 1 9. The seventeenth output of the control unit 14 is connected to the zero (setting) input of the reversing account 6. 6. The eighteenth output of the control unit 14 is connected to the control input of the binary-decryptor .

The outputs of the decoder 24 from the first to the eighteenth respectively connected to the outputs of the control unit 14 with the first

on the eighteenth. The nineteenth output of the decoder 24 is connected to the first input of the element OR 19, the second input of which is connected to the twentieth output of the decoder 24.

The output of the 1G pulse generator is connected to the nepBbitvi input of the element And 17. The second output of the element And 17 is connected to the output of the trigger 20. The output of the element And 17 is connected to the counting input of the counter 18. The zero input of the counter 18 is connected to the first input

element 21 OR, and with the first input switch 23. The output of the counter 18 is connected to the input of the decoder. 24. The output of the OR element, 19 is connected to the counting input of the trigger 20, the zero input of which is connected to the output of the OR element 21. The second input of the OR element 21 is connected to the first input of the switch 22. The second inputs of the switch 22. 23 are connected to the common point (housing) of the device .

The operation of a digital magnetic induction meter occurs in several switching cycles.

When the switch button 23 is pressed, the device is reset. In this case, the counter 18 is nullified, and the trigger 20 provides the decisive potential to the element And 17. Through the element 17 and the input of the counter 18, signals from the pulse generator 16 begin to arrive. The decoder 24 analyzes the state of the counter 18 and outputs signals to all the blocks of the device. The signal from the seventeenth output of the control unit 14 sets the reversible counter 6 to the zero state. From the ninth output of the control unit 14, a signal is output that guides the division unit 10 to work. The signal coming from the eighth output of the control unit 14 sets it to the zero state register 11, the signal from the twelfth output sets to zero the trigger of the reverse 7. In this position, the trigger of the reverse 7 outputs such a signal to the reverse of the reverse of the reverse counter 6, in which it operates in the folded state not

In the first cycle, the Hall sensor 1 is in the gap of the magnetic circuit for some time, so that the temperature of the object under investigation is established in the entire volume of the measuring probe with the Hall sensor 1, i.e. into the gap of the magnetic circuit. At this time, the Hall sensor 1 is acted on by two permanent magnetic fields - measured with induction B and an additional beam with induction Vdm, created by the induction coil 3 wound on the Hall sensor 1, through which current flows from the power source 4. Hall sensor output signal proportional to the algebraic sum of magnetic inductions (± V + Vdm), is fed to the voltage-code converter 5, the analog-to-digital conversion occurs on signals received from the converter 5 from the third output of the control unit 14.

The analog signal of the Hall sensor 1 is converted to the number of pulses that arrive from the converter 5 on the counting

input of reversing counter b counting in the forward direction: Ni KSin (± B-f-Vdm),

where k is the conversion factor of the 5-pin code;

In is the power supply current of the Hall sensor; S is the sensitivity to induction of the Hall sensor,

In the second cycle switching on the sensor

0 Hall 1, only a measurable magnetic field with induction B acts, since the signal coming from the first output of the control unit 14 cuts off the power supply 4. Pr1 / z through an induction coil 3

5 no current flows, which excites a supplementary magnetic field with induction

Vdm. Signal output from Hall sensor 1,

proportional to the magnetic induction B,

enters converter 5, from where in

0 the form of a sequence of pulses is fed to the reversible counter 6, reading in the opposite direction. The counting direction of the reversible counter b in the second switching cycle changes according to a signal that goes to a single input of the reverse 7 trigger from the thirteenth output of the control unit 14. In the second cycle the reversing counter b will work for subtraction. If the positive direction of the measured magnetic induction B coincides in direction with the additional magnetic induction Vdm, a code is set in the reversible counter 6

N2 - Ni-KS nB - (B + Vdm)

five

At the same time in the output register of the converter 5, the code N3 will be set, corresponding to the magnetic induction B N3 KSlnB

0 In case of a negative direction of the measured magnetic induction B, which does not coincide in direction with additional magnetic induction Vdm, in the second cycle the reversible counter 6 will operate on

5 subtraction, and then on addition. When the numbers In the reversible counter 6, it will become zero, the AND 15 element will work and will generate a sig. It is fed to the counting, the input of the trigger of the reverse 7. The trigger of the reverse 7 goes into zero position and issues a reverse on the reverse bus-. sive counter b and such a signal by which it will work on the addition.

In the reversible counter, the code will be set.

5Ы2 К81пВдм

Thus, regardless of the direction of the measured magnetic induction. with respect to the direction of additional magnetic induction Vdm in the reversible counter 6 after the second switching cycle

will be the same code. At the same time, in the output register of converter 5, the code Мз will be set, corresponding to the magnetic miduction B. To the first input of the division unit 10 through the group element 2-2 211И) / / 1 8 nociynaeT code Ns from the output register of the converter converter-code 5. PaapeujeiiMe N3 through element group 2-2-2И-311Л1Л 8 Eats the signal coming from the fourth output of the control unit 14. The signal coming from the fourteenth output of the control unit 14 triggers a group of elements 2-2-2AND-ZILI 9 and the code N20 of the reversible counter 6 enters the second input unit actually 10.

The signal received from the tenth output of the 6-locus 14, in the division block 10, divides the code Мz by the code Na, the result of division equal to

.. To Sin В „В

- Ki -.

(one

K1

K S p V.dmV dm

enters the register 11. Resolution from the post-code to the register 11 generates a signal coming from the eighth output of the control unit 14, Then, a signal coming from the fifteenth output of the control unit 14 triggers a broken group 2-2-2AND-ZILI Al-code N2 from the output of the re-energized counter 6 is fed to the second input of the division unit 10,

During the BTopo v switching cycle, when-; ow e-ts. signal on des t iadm output of the decoder 24, the element / 1 / I1 is triggered

19 and vyzetsi-nel on the count (th input trigger 20. Trigger 20 goes B unit - th coc-f o m to k gives out a very positive potegial on Element And 17, As a result, on the counting switch 18 no longer impulses from the pulse generator 16, Then, on Hall1 to Hall 1, it is removed from the gap of the lag-nitro, from the magnetic permeability. The DoI is placed in a medium with magnetic permeability / to (air). At the same time, the magnetic core does not have a practical effect on the induction of the splitter magnet-iom, created by the coil, which 3. As for the sensor. 1enm sensor from the gap the result of the fi fio magnetic permeability in a medium with magnetic permeability of 1 aw / l temperature of the thermometer probe, which is located in the Hall sensor 1, r p3KTV 4ecKM, the sensitivity of the Hall sensor 1 does not change, i.e. remains equal to S. TAGs switch 22 is pressed and the third switching cycle is activated. At the same time, the trigger

20 is set to the zero state, which allows the signal loop to pass from the geyzertotor pulses 16 through the AND element 17 to the counter 18.

In the third switching cycle, the Hall sensor 1 has two permanent magic fields: an external magnetic field with induction Вв and an additional magnetic field Вдмо created by the induction coil 3. The output signal of the Hall sensor 1, proportional to the sum of values (± Вв + Вдмо) post, falls on voltage-to-code converter 5. Analog-to-digital conversion in converter 5 takes place rso signals received from the converter input 5 s

of the third control unit 14. The analog signal of the Hall sensor 1 is converted from the number of pulses that come from the converter 5 to the counting input of the reversible counter 6, which is the ground signal in the y / y direction

(± Вв--Вдмо) In the fourth cycle of the com- puter, and on the Hall sensor 1, only the external magnetic field Bb acts, since the signal coming from the first output of the control unit 14 turns off the power source 4, At the same time, the mg-coil 3 does not leak current that excites an additional magnetic field

Vdmo Signal datch; 1ka Hall 1, p ro l o r c a n a l i s s. a g i and t n about and and n d u to ts i and SB, arrives at the presetter 5, from where in the form of a patient of the multipulse enters the reversible counter 5, counts 10 and 1 in the opposite direction. The operation of the smms in the reversing counter 6 in the Bram of the fourth switching cycle varies with the signal. I act on 1u ma single entrance trigger trigger 7 s

the output of the control unit 14, the fourth TciKT commutator 1 reversible counter 6 will work for subtraction.

In the case of a positive direction of external magnetic induction Bb, which coincides in direction with the additional magnetic induction of Vdmo, a code is set in the reversible counter 6

G41; Г 5-К31пВв КЗ п (Вв + Вдмо) .8 К5 пВдмо,

In the case of the negative direction of the external magnetic induction Bb, which does not coincide in direction with the additional magnetic induction of Vdmo, there is a reversible counter in the fourth cycle. 6 waveforms will work on subtraction, and then on addition. When the number 8 of the reversible counter b becomes equal to zero, it will work on the earth 1-t and 15, and will give a signal to the counting trigger input of the reverse 7. The trigger of the reverse 7 goes s

Claims (1)

Claim Digital meter for magnetic induction No. 347704, distinguishing with the fact that, in order to increase measurement accuracy, two groups of elements 2-2-2 ISILI, a register, an element And, a reverse trigger and a binary decimal decoder are additionally introduced into it, while the control unit from the fourth to the eighteenth, respectively, connected to the first control input of the first group of elements 2-2-2I-ZILI, with the second control input of the first group of elements 2-2-2I-ZILI, the third control input of the first group of elements -ZILI, control input of the register, zero input of the register, zero input m division block, the division input of the division block, the control input of the AND element, the single input of the reverse trigger, the first control input of the second group of elements 2-2-2I-3IL 14, the second control input of the second group of elements 2-22I-ZILI, the third control input ' the second group of elements 2-2-2I-ZILI, the zero input of the reversible counter, controlling the input of the binary decimal decoder, the output of the register is connected to the first information input of the first group of elements 2-2-2I-ZILI, the second information input of which is connected to the input of the element AND , the first and second information inputs of the second group of elements 2-2-2I-ZILI and the output of the reverse counter, the third information input of the second group of elements 2-2-214-ZIL AND is connected to the information input of the register, the information input of the binary decimal decoder and the output of the block division, the first information input of which is connected to the output of the second group of elements 2-2-2I-ZILI, and the second information input-output of the first group of elements 2-2-2I-ZILI, the third information input of which is connected to the code output of the voltage converter of the code, and the output element is connected to the counting input of the reverse trigger whose output is connected to the input of the reversible counter and the output of BCD de. the encoder is connected to the input of a digital reading device.