SU789955A1 - Magnetic field variation compensator - Google Patents

Description

The invention relates to magneto-elimination, namely, to compensating for variations in the magnetic field by a quantum optical helium compensator using Raz. signals, and is designed to maintain a stable magnetic field in a certain volume when tuning and researching magnetometric equipment.

Known compensator variations of the magnetic field, which operates on the principle of a quantum helium magnetometer.

The device contains a magnetically sensitive block, a selective amplifier, a phase detector, a direct current amplifier and a system of Helm rings, rings connected in series, as well as a modulating generator connected to a phase detector and a magnetically sensitive block.

 disadvantages of this device

should include low accuracy. 25 The placement of the magneto-sensitive compensator blocks and customizable. the first magnetometer within one compensation volume limited by the Helmholtz coil system reduces; JQ

accuracy of compensation, since it is impossible to simultaneously use the central part of the volume of the cobalt to accommodate two magnetically sensitive blocks.

The presence of only one volume of the clamping does not allow the use of a compensator when setting up magnetically sensitive blocks, the dimensions of which are more than 10-15% of the size of the compensation volume, as well as setting up magnetically sensitive blocks containing ferromagnetic details and creating magnetic interference fields. This reduces the accuracy of stabilization. In addition, with serial tuning of magnetometric equipment, the availability of only one compensation amount limits the labor productivity. The absence of an indicator, with the help of which it is possible to systematically monitor the maintenance of a stable magnetic field, the field in the compensation volume, does not allow an objective assessment of the operation of the compensator during long hours of continuous operation of the device.

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

This goal is achieved in that a device containing successively connected.-1 amplification unit, a selective amplifier, a phase detector and a direct current amplifier, as well as a pair of Helmholtz rings and a frequency synthesizer, the output of which is connected to the second inputs of the magnetically sensitive unit, the selective amplifier and phase detector, additionally introduced pairs of Helmholtz rings connected in series with the first pair, as well as in series with the second magnetically sensitive unit, the second of A bi-ampal amplifier, a second phase detector, an infra-low-frequency amplifier and a recorder, with the second inputs of the selective amplifier and phase detector connected to the frequency synthesizer, and all pairs of Helmholtz rings are shunted by resistors.

The drawing shows the block diagram of the compensator variations of the magnetic field.

The compensator contains magnetically sensitive blocks 1 and 2, a selective amplifier 3, a phase detector 4, a DC amplifier 5, a frequency synthesizer 6, a Helmholtz ring system 7.8 and 9, a selective amplifier 10, a phase detector 11, an infra-low amplifier 12, a recorder 13 and resistors 14, 15 and 16. A magnetically sensitive unit 1 is connected in series with a selective amplifier 3, a phase detector 4, a direct current amplifier 5. The systems of the Helmholtz rings 7.8 and 9 are connected in parallel with resistors 14.15 and 16. The magnetically sensitive unit 2 is connected in series with the selective amplifier 10, the phase detector 11, the amplifier is low-low. frequency 12 and recorder 13. The frequency synthesizer is connected to the magnetically sensitive blocks 1 and 2, selective amplifiers 3 and 10, and phase detectors 4 and 11.

The device works as follows.

In the static mode, the signal from the magnetically sensitive unit 1 is fed to amplifier 3,, then to phase detector 4 and amplifier 5, the current from which is fed to the series-connected Helmholtz ring system 7.8 and 9 and in each ring system creates a stable homogeneous mag A non-magnetic field, other than the earth’s magnetic field, whose intensity is given by the corresponding resonant frequency from the synthesizer b. Since the magnetic field in the stabilization volumes of the systems of the Helmholtz rings 7.8 and 9 is stable

The unbalance signal from the magnetically sensitive unit 2, amplifier 10, phase detector 11 and amplifier infra-low-frequency 12 is zero and the recorder 13, which is turned on at the output of amplifier 12, writes a straight line or the system's own noise.

In the dynamic mode, when the intensity of the earth's magnetic field changes in the region of the magnetic field compensator in the magnetically sensitive unit 1, an imbalance signal arises. Then, amplified by amplifier 3, phase detector 4 and amplifier 5, the signal creates such a current in the systems of the Helmholtz rings such that the strength of the magnetic field in the volumes of the systems of the Helmholtz rings remains constant. If the stabilization factor is large and the spread of the magnetic permanent systems of the Helmholtz rings 7.8 and 9 is eliminated by passing some feedback current through resistors 14, 15 and 16, then the signal from the magnetically sensitive unit 2 is so small that it is amplified by the amplifier 10 phase detector 11 and the infra-low-frequency amplifier 12 will not provide a change in the recording of the recorder 13. This indicates normal operation of the compensator. With the detuning of the systems of the Helmholtz rings 7.8 and 9, the signal from the magnetically sensitive unit 2 is larger and provides a corresponding deviation on the recorder 13, which indicates a malfunction in the system.

The use in the proposed compensator of additional systems of Helmholtz rings, shunted by resistors, and an additional control channel consisting of a selective amplifier, phase detector, infra-low frequency amplifier and recorder, improves the accuracy of stabilization of the magnetic field strength and increases the work efficiency by obtaining the possibility of parallel work immediately with several test magnetometers.

the invention

Formula

A magnetic field variation compensator containing a series-connected magnetically sensitive unit, a selective amplifier / phase detector and a dc amplifier, as well as a pair of rings. Helmholtz and a frequency synthesizer, the output of which is connected to the second inputs of the magnetically sensitive unit, the selective amplifier and phase detector, characterized by that, in order to increase the accuracy, a pair of rings are added to it

Helmholtz connected in series with the first pair, as well as serially connected second magnetically sensitive unit, second selective amplifier, second phase detector, infra-low frequency amplifier and self-recording device, while the second inputs of the selective amplifier and phase detector are connected to a frequency synthesizer, and all Helmholtz pairs are shunted by resistors .

Sources of information taken into account in the examination

1. Scherer A. Review of Selence Instruments. V. 32, 11, p. 11901192.

Claims (1)

Claim A magnetic field variation compensator comprising a magnetically sensitive unit, a selective amplifier, a phase detector and a DC amplifier, and a pair of Helmholtz rings and a frequency synthesizer, the output of which is connected to the second inputs of the magnetosensitive unit, a selective amplifier and a phase detector, characterized in that that, in order to increase accuracy, pairs of rings are additionally introduced into it Helmholtz connected in series with the first pair, as well as connected in series with a second magnetosensitive unit, a second selective amplifier, a second phase detector, an infra-low-frequency amplifier and a recording device, while the second inputs of the selective amplifier and phase detector are connected to the frequency synthesizer, and all Helmholtz pairs are shunted resistors.