SU864199A1 - Device for measuring magnetic field non-uniformity parameters - Google Patents

Description

which consists of two one-component transducers, the transducer axes of two sensor units are parallel to each other and perpendicular to the base axis passing through the centers of these transducers, the transducer axes of the third sensor block are coaxial with the base axis passing through the centers of these transducers, the three detectors, the first two the inputs of each of which are connected to the outputs of magnetometric converters and to the switching input of each synchronous detector, and a recording device, the inputs of which are connected enes to the outputs of the synchronous detectors. The reference axes of all the transducers are coaxial, and the transducer axes of the three sensors are located in three mutually orthogonal planes 21

The converters in the known device react only to the projection of the vector of magnetic induction on their axis, and are arranged so that every three of the mentioned converters occupy the minimum constructively acceptable amount of space. Such an arrangement of the transducers of the sensors leads to the mutual influence of the magnetic field of one transducer on the others, which causes a false signal in them, which is an additional error in measuring the spatial derivatives of the magnetic induction vector. Increasing the distance between the magnetometer converters leads to a decrease in the resolution of the device, and hence to a decrease in the measurement accuracy.

The aim of the invention is the accuracy of measuring the parameters of the inhomogeneity of the magnetic field.

The goal is achieved by the fact that in a device containing a rigid non-magnetic base with three blocks of gradiometric sensors on it / each of which consists of two single-component magnetometric transducers, the axes of magnetometric transducers One of these blocks is parallel to each other and perpendicular to the base axis, passing through the centers of these conversions, centered around the magnetic converters of the second block, parallel to each other and perpendicular | 1 the cues of the base axis passing through The centers of these converters, the axes of magnetic converters: the third block is coaxial with the base axis passing through the centers of these converters, three synchronous detectors, the first two inputs of each of which are connected to the outputs of magnetometric converters of one of the gradiometric sensor blocks, the generator

AC, the outputs of which are connected to the inputs to the magnetometer converters and to the switching input of each synchronous detector, and the registering device, whose inputs are connected to the outputs of all synchronous detectors, the basic axes of the magnetometric converters are mutually orthogonal, the magnetometric converters of the first and second blocks are gradientimetric the sensors are parallel to the base axis of the third block by gradient sensors, and the magnetometric transducers of each block are located s at the same distance from the point of intersection of the base axes.

The drawing shows a block diagram of a device for measuring parameters of a magnetic field inhomogeneity.

The device contains three blocks of gradiometric sensors 1,2 and 3, each of which consists of two one-component magnetometric converters 4 and 5, 6 and 7, 8 and 9, three synchronous detectors 10, 11 and 12, a current generator 13, the outputs of which are connected to inputs of converters 4, 5, b, 7, 8 and 9 and switching inputs of synchronous detectors 10, 11 and 12, a recording device 14, whose inputs are connected to the outputs of detectors 10, 11 and 12, and a rigid non-magnetic base 15 on which blocks are located gradiometric sensors 1,2 and 3 "Axis transducer 4 and 5 are parallel to each other and perpendicular to the base axis of the AC passing through the centers of these converters A and C. The axes of converters 6 and 7 are parallel to each other and perpendicular to the base axis of DK passing through the centers of these converters D and J. 8 and 9 are coaxial with the LP LP axis passing through the centers of these L and P transducers. Gradiometric sensors 1, 2, and 3 are mounted; the tangent is such that their Vase axes AC, DK and TP are mutually orthogonal, and the axes of transducers 4 , 5,6,7,8 and 9 are parallel to the base axis of GH. The converters 4,5,6,7,8 and 9 of the units of the grading sensor sensor bb 1,2 and 3 are located at the same distance from the intersection point About the base axes of the AC, DK and PD of the blocks of the gradient sensor 1, 2 and 3, i.e. . ,, Each base axis, OK, and LP are directed along one of the axes bX, OY, OZ of a rectangular spatial coordinate system. In this case, the axis

O t AC is directed along the OX axis, the DK axis along the OY axis and the rF axis along the OZI axis

Claims (2)

The device works as follows. Each transducer is 4,5,6,7,8, and 9 responds only to the projection of the vector of magnetic induction on the double axis. From the outputs of converters 4 and 5, 6 and 7, 8 and 9 of the blocks of graciometric sensors 1, 2 and 3, signals are received to the first inputs of synchronous detectors 10, 11 and 12, proportional to the differences of the projections of magnetic inductions on the axes of the mentioned converters. Since the distance between the converters 4, 5, 6, 7, 8, and 9 is constant, signals at the inputs of the synchronous detectors 10, 11, and 12 are proportional to three spatial derivatives of the magnetic induction vector. So the input of the detector 10 receives a proportional signal) the input of the detector 11 receives a proportional signal -; - and a signal arrives at the input of the detector 12, - - proportional to Э% o: Jbz spatial derivatives. magnetic induction vector. The current generator 13 excites the magnetically sensitive elements of converters 4,5,6,7,8 and 9 and switches detectors 10, 11 and 12. The detected signals from the detectors .10, 11 and 12 are fed to the inputs of the recording device 14. In one ; native and isotropic medium (M consults does not contain currents, rot, where. B is the vector of Magnetic induction. In this case, the following spatial derivatives are equal ... .L.-M av h / e 6a 3ftx aft eu eZ do dz Ek Consequently, the device can measure spatial derivatives equal to spatial However, compared with the known device, the accuracy of measurement of the heterogeneity parameters of the power field with this device is higher. The measurement accuracy is improved. The device is achieved due to the fact that all the transducers are separated in space by considerable distances exceeding several times the maximum linear dimensions of the transducers themselves. Such a disposition of the magnetometric transducers on a rigid non-magnetic base virtually eliminates the and the magnetic field of one magnetometric transducer to another and, consequently, attenuates several orders of magnitude false signal Obus gyuvlenny by said mutual influence of that increases the precision measurement of parameters of the magnetic field inhomogeneity compared to known apparatus. Claims An apparatus for measuring the parameters of the inhomogeneity of a magnetic field comprising a rigid non-magnetic base with three blocks of gradiometric sensors located on it, each of which consists of two; one-component magnetometric transducers, the axes of the magnetometric transducers of one of these blocks are parallel to each other to the perpendicular-base axis passing through the centers of these converters, the axes of the magnetometric transducers of the second block are parallel to each other and perpendicular to the base axis passing through the centers of these converters, the axes of the magnetometric converters of the third block are coaxial with the base axis passing through the centers of these converters, three synchronous detectors Pa, the first two inputs of each of which are connected to the outputs of magnetometric converters of one of the blocks of gradient sensors, an alternator, the outputs of which are connected to the inputs of magnetometric converters and the switching input of each synchronous detector, and a recording device whose inputs are connected to the outputs of all synchronous detectors, characterized in that, in order to improve accuracy, the basic axes of the magnetometric converters are mutually orthogonal, the magnetometric the forming of the first and second blocks gradientometrichesknh sensor base parallel to the axis of the third unit gradiometric sensors and transducers of each magnetometric blokd -on located equidistant from. intersection points of the base axes. Sources of information taken into account in the examination 1.YU.V. Afanasyev Ferrozondy, L., Energie, p. 127-135. 2. For the UK of Great Britain No. 1421365, cl. G 01 R 29 / 08,1976.