SU1707581A1 - For measuring parameters of magnetic field - Google Patents

Abstract

The invention relates to magnetic measurements using flux-gate instruments and is intended to measure the strength of a magnetic field to its linear gradient with high accuracy. The purpose of the invention is to improve the accuracy of measuring magnetic field parameters. The device contains two flux-gate comparing units (FSB) 1, 2, the collision sensitivity axis of which are collars, the add block 3, the read block 4, two aialogul digital converters (A1SCH) 5, 6, the record block 7, the counting pulse generator 8, the clock generator 9, the switch 10, the feedback coils 11 and the gradient compensation coils 12. FSB 1 and 2 are separated by a certain distance, which is the base of measurements. Coils 11 and 12 consist of two sections each, with section 11.1. and 12.1 are placed by the EDOL of the smallpox sensitivity FSB 1, and sections 11.2 and 12.2 are respectively the FSB 2 ,. Output of FSB 1 is connected to parallel first connected inputs of blocks 3 and 4, to parallel connected second outputs of which FSB 2 is connected. The output of block 3 is connected to the signal input of ADC 5, the digital output of which is connected to the first pass of block 7 of registration, and the analog one output. to coils 11. The output of block 4 is connected to the signal input of the A / D converter 6, the digital output of KOTOpoi o is connected to the second input of block 7 of the recording, ri is the analog output output to catupgm 12, Outputs of generators B and 9 connected to the control signal and the control input - switch 10, whose output is connected to counting khodam ADC 5 and 6, respectively. The proposed set of features makes it possible to increase the accuracy of measuring the magnetic field gradient by 2-3 orders of magnitude compared with the prototype. 1 il. yy ate 1g s. f: t іп Oi) Wn4.

Description

The invention relates to magnetic measurements using flux-gate instruments and is intended to measure the strength of a magnetic field and its linear gradient with high accuracy.

The purpose of the invention is to improve the accuracy of measuring magnetic field parameters. ,

Lla drawing shows the scheme of the device.

The device contains the bottom of the fluxgate comparing block (FSB) 1 and 2, blocks of addition 3 and subtraction 4, two analog-digital converters (ADC) 5 and 6, block 7 of registration, generator 8 of counting pulses, clock generator 9, switch 10, coils reverse connection 11 and gradient compensation 12.

FSB 1 and 2 are separated by a certain distance, which is the base of measurements, and their sensitivity axes are collinear. Coils 11 and 12 consist of two sections each, with sections 11.1 and 12.1 located along the sensitivity axis of the FSB 1, and sections 11 and 12.2 respectively of the FSB 2.

Output FSB 1 is connected :: parallel connected to the first inputs of the block of addition 3 and subtraction 4 to output of FSB 2 connected to parallel connected second inputs of the output of block 3 is connected to the signal input of ACI 5, the digital output of which is connected to the first input of block 7 of the registration, and analog the output is to the coils 11 of the feedback.

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It goes to ADC 5. When switch 10 is set to position a, ADC 5 converts the input signal of a magnetic field into a binary code, which is fed to recording unit 7. From the analog output of the A / D converter 5, the signal enters the coils 11.1 and 11.2 by automatically compensating the measured field in FSB 1 and 2. The compensation signal is changed to those. then until the output voltage from block 3 becomes zero, after which the flow of counting pulses from the generator 8 through the switch 10 stops.

When the switch 10 is set to the position b, performed by the clock generator 9, the automatic compensation of the magnetic field is stopped. ADC 5 remembers the signal of the magnetic field. In coils 11.1 and 11.2, a constant current flows, which reproduces a constant magnetic field measured at the time of switching the switch 10. When the latter is set to position b, the conversion coefficient of each channel increases by 2-3 times at the transfer coefficients of coils 12.1 and 12.2, close to zero. In this case, the sensitivity of the device proposed is also increased by 2-3 times,

The signal from the input unit / t, proportional to the value of the magnetic induction gradient, goes to the ADC 6, which converts it to the binary code fed to the recording unit 7, and from the analog output of the ADC, this signal

The output of block 4 is connected to the signal 40 and enters the counter-switched

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input input A1SCH 6, whose digital output is connected to the second input of registration unit 7, and analog output to coils 12 of gradient compensation.

The outputs of the generators 8 and 9 are connected respectively to the signal and control inputs of the switch 10, the outputs of which are connected to the counting inputs of ADC 5 and 6, respectively.

The device works as follows.

Output signals with FSB 2, proportional to the values of the projections of the vector of magnetic induction acting on the corresponding dia. (FSB, postun - cl on addition 3 blocks and subtraction 4. The output signal from block 3 proportional to the value of the sum of the measured magnetic induction of FSB 1 and 2 post50

coils 12.1 and 12.2 compensate for the gradient of magnetic induction until the output of the N-block from block A is zero, after which the counting pulses from the generator 8 skull switch 10 to the input of the ADC 6 is terminated. By varying the ratio of the transformer coil 12, the gradient of the magnetic induction can be measured over a wide range.

The use of ferroschen shingled blocks of blocks 1 and 2 in the proposed device makes it possible to measure the magnetic induction increment on the basis of these transformations. th o i 1 -1C nTl; yu de s tkov thousands of hours sat down on foot, which went the way ;; - it is the accuracy of measurement of the parameters of the magnetic field, in particular the magnetic induction gradient under conditions

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coils 12.1 and 12.2 compensate for the gradient of magnetic induction until the output of the N block from block A becomes zero, after which the counting pulses from the generator 8 skull switch 10 to the input of the ADC 6 is terminated. By varying the ratio of the transformer coil 12, the gradient of the magnetic induction can be measured over a wide range.

The use of ferroschen shingled blocks of blocks 1 and 2 in the proposed device makes it possible to measure the magnetic induction increment on the basis of these transforms. o o i 1 -1C nTl; ten thousandths of hours sat down on the leg, which went the same way ;; - the accuracy of measurement of the parameters of the magnetic field, in particular the magnetic induction gradient, under the conditions.

Claims (1)

Invention Formula A device for measuring magnetic field parameters containing two flux-gate comparison units, the sensitivity axes of which are collinear, an addition unit, a subtraction unit, two analog-digital converters of follower type, a generator of counting pulses, a recording unit and two feedback loops The axes of which coincide with the axes of sensitivity of the corresponding flux-junction comparison blocks, the outputs of which are of the subcontrol, the second output of which is connected respectively, to the first and second inputs of the folding and subtracting units, the output of the subtracting unit being connected to the signal input of the first analog-digital converter, digital 25 to the counting input of the second analog-to-digital converter, while the output of the counting pulse generator is connected to the signal input of the switch. . The rotor output of which is connected to the first input of the registration unit, the second input of which is connected to the digital output of the second anapo-digital converter, the analog output of which is connected to the feedback coils, and the input to the output of the adding unit, in order to improve the accuracy , the serially connected clock generator and the comm. a tator, as well as two gradient compensation coils, placed co-coaxially with the corresponding feedback coils and connected to the analog output of the first analog-to-digital converter, the counting input of which is connected to the first output of the cat mutator, the second output of which is connected to the counting input of the second analog-to-digital converter, while the output of the counting pulse generator is connected to the signal input of the switch. .