Non-magnetic heating device for nuclear magnetic resonance gyroscope

Abstract

The invention provides a non-magnetic heating device for a nuclear magnetic resonance gyroscope. The device consists of a heating body, a heating wire, a heat insulating framework and magnetic compensation coils, wherein the heating body is made of a non-magnetic high-heat-conductivity material, and is of a hollow structure; an atomic gas chamber is placed into the heating body for being uniformly heated; the four faces of the outer side of the heating body are provided with heating grooves; the nickel-chromium alloy non-magnetic heating wire can be placed into the heating grooves positively or reversely, thereby constructing a spatial symmetrical non-magnetic heating structure under the constraints of the heating grooves; after the heating body and the heating wire are fixedly assembled, the combination is fixed in the polytetrafluoroethylene heat insulating framework; three groups of winding grooves are formed in the heat insulating framework for winding enameled wires, thereby constructing three groups of orthogonal Helmholtz magnetic compensation coils for compensating a residual magnetic field. Compared with the prior art, the non-magnetic heating device has the advantages of compact structure, easiness in assembly, easiness in implementing engineering, high heating uniformity, high heating efficiency and high heating magnetic field counteracting capability.

Description

technical field [0001] The invention relates to the technical field of heating of nuclear magnetic resonance gyroscopes, in particular to a non-magnetic heating device for nuclear magnetic resonance gyroscopes. The device is mainly used in the fields of strategic and tactical weaponry, micro space vehicles and the like. Background technique [0002] Miniature nuclear magnetic resonance gyroscopes have the characteristics of small size, low power consumption, high performance, and large dynamic range, and have become the research focus and hotspot of new inertial devices. The performance of NMR gyroscopes is affected by the macroscopic magnetic moment of atomic nucleus spin, which is directly related to the atomic density of alkali metals. In order to improve the signal-to-noise ratio of the gyroscope, it is necessary to heat the atomic gas chamber to above 100°C to obtain high-density alkali metal vapor, and to suppress the negative impact of the heating magnetic field on th...

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Problems solved by technology

[0003] Hot air heating is a better non-magnetic heating method, but it has insurmountable shortcomings such as large volume and high power consumption, and cannot be used for miniature nuclear magnetic resonance gyro

A. Shkel's research group at the University of California, Irvine used the bottom of the copper rod to heat the atomic gas chamber, and the heating temperature reached 130°C. However, the non-uniform magnetic field introduced by the straight wire reduced the transverse relaxation time of the macroscopic magnetic moment of the inert gas, and the thermal uniformity was poor. lead to poor gyro performance

Northrop Grumman and others used a bidirectional current method to heat the glass gas chamber at the bottom, and obtained high-density alkali metal atom vapor, but there is still the problem that the transverse magnetic field gradient of the gas chamber is too large

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