Magnetometric sensor

 

The invention relates to the survey, in particular to systems orientation of moving objects, and is designed to control the parameters of the curvature of the wells. The technical result of the invention is to reduce size and increase measurement accuracy. This sensor contains three identical terrasond, the axis of sensitivity of which form with the longitudinal axis of the cylindrical body, the same angles. Flux-gates are arranged so that each of them can be combined with the other by rotation around the longitudinal axis of the housing at an angle of ±120°. The values of the angles between the axes of sensitivity of the flux-gates and the longitudinal axis of the housing lie in the range [D1, 90° - D2] and [90° + D2, 180° - D1], where D1,D2- angle values due to tolerances of the dimension of the vector of the geomagnetic field. 1 Il.

The invention relates to the field of Geophysics and can be used inclinometers to build converters magnetic azimuth, and magnetometers for various purposes.

Known sensor for measurement of azimuth in a borehole containing three terrasond, https://img.russianpatents.com/chr/176.gif">and lie in parallel planes perpendicular to the axis of the housing, and the centers of the flux-gates are located on the axis of the housing [Copyright certificate №605950, E 21 IN 47/022, BI No. 17, 1978].

Sensor fault is that, due to the coplanar arrangement of the axes of sensitivity of the flux-gates it is not possible to measure all three components of the vector of the geomagnetic field. In addition, lack of sensor design is the complexity caused by the application of three flux-gates, while for measuring azimuth, in this case, it is sufficient to use only two terrasond, thereby simplifying not only the design of the sensor circuit and the signal conversion flux-gates.

It is also known a device for the control of complex parameters of the curvature of the wells containing the generator, three terrasond, one of which is oriented along the longitudinal axis of the body, and the other two are located in mutually perpendicular planes at equal angles to the longitudinal axis of the housing, three electoral amplifier connected to the signal windings of the flux-gates, seven switches, three sine-cosine transformer (synchro), serially connected analog-to-digital Converter and a memory, timer, Hiking control switches, thus the inputs of the first four switches connected to the outputs of the selective amplifier and oscillator, and outputs to the stator windings of the first and second synchro, the rotor windings are connected to the inputs of the seventh switch and through the fifth and sixth switch to the stator windings of the third synchro, the rotor winding of which is connected to the input of the seventh switch connected output to the analog-to-digital Converter [Copyright certificate №1208208, E 21 IN 47/02, BI No. 4, 1986].

The disadvantage of this device is the design complexity due to the use of a large number of identical functional elements (three electoral amplifiers, seven switches, three synchro), and the low accuracy of measurement due to the influence of friction in the bearings of the rotation of the framework, with associated synchro measuring anti-aircraft and sighting angles, due to the relatively low accuracy synchro, due to the lack of negative feedback in the signal processing of the flux-gates, and also due to suboptimal layout flux-gates.

The closest to the technical nature of the claimed sensor is a magnetic sensor azimuth, which is taken as a prototype and contains three enshrined in cylindricus the haunted corners, values less than 57,36and the angles between the projections of the axes of sensitivity of the flux-gates to the plane of the cross-section of the hull is 120[RF patent № 2018646, E 21 IN 47/02, BI No. 16, 1994].

Compared to the flux-gate sensor in the known device, this sensor provides higher accuracy at the expense of equality of the angles between the longitudinal axis of the housing and the axis of sensitivity of all flux-gates and symmetrical position relative to the body axis projections of the axes of sensitivity of the flux-gates to the plane of the cross-section of the hull, but has large dimensions. They are due to the fact that to eliminate the mutual influence of the flux-gates must be located at some distance from each other, thereby increasing the longitudinal dimensions of the cylindrical body.

The invention solves the problem of reducing the dimensions of the sensor.

The technical result to be obtained from use of the invention is that the sensor due to the specific location of the flux-gates it is possible to manufacture coaxially with the housing holes for routing transit wires. When this alignment is achieved impacts on the signals of the respective interference. In addition, reducing the dimensions of the sensor allows to increase the accuracy of measurements of the anisotropic magnetic fields.

The solution of the stated problem is achieved by the fact that the magnetometric sensor containing three fixed in the cylindrical housing of the same terrasond, the axis of sensitivity of which form with the longitudinal axis of the housing, equal angles, and the angles between the projections of the axes of sensitivity of the flux-gates to the plane of the cross-section of the hull is 120the flux-gates are arranged so that each of them can be combined with other by rotation around the longitudinal axis of the housing at an angle120and the values of the angles between the axes of sensitivity of the flux-gates and the longitudinal axis of the housing lie in the range [1, 90-2] and [90+2, 180-1], where1,2- angle values due to tolerances of the dimension of the vector of the geomagnetic field.

In the proposed dasami all flux-gates are in the same condition, i.e. if there is a mutual influence of the flux-gates, then they are equal. Equal to each other and influence each pair of flux-gates on the third terrasond. This leads to the alignment parameters of the flux-gates and in the case of the correction characteristics of the flux-gates can do more than simple algorithms and methods of sensor calibration.

The sensor prototype of the mutual influence of the flux-gates are aligned only by zero, which is achieved by staggering the flux-gates in the direction of the longitudinal axis of the housing and a corresponding increase in the dimensions of the sensor. If you consider that to eliminate the mutual influence of the flux-gates the distance between them should be not less than 1.5 L, where L is the length of terrasond, the longitudinal size of the sensor prototype is not less than L1=3L+SLcoswhere- the angle between the axes of sensitivity of the flux-gates and the axle housing.

In contrast, the size of the proposed sensor is L2=Lcosi.e. for example, if=60in L1/L2=9 times less than that of the sensor prototype.

Note that the size of the flux-gate sensor known in mouth=90and flux-gates can be placed in close proximity to each other, equal to 2.5 L and 5 times the size of the proposed sensor.

Thus, the essential difference between the proposed sensor from known sensors with three-dimensional location of the flux-gates is symmetric arrangement of the flux-gates relative to the longitudinal axis of the housing. Thanks achieved a significant reduction in the dimensions of the sensor, the alignment of possible mutual influences of flux-gates, and the alignment of the influences on the signals of the flux-gates of possible interference from currents flowing through the transit wires passing through coaxially with the casing technological hole, which is formed due to the symmetrical arrangement of the flux-gates. When this alignment of mutual influences of flux-gates in itself is a significant difference between the proposed sensor from known devices, because they affect each other flux-gates are not aligned, and are reduced by staggering the flux-gates and a corresponding increase in the dimensions.

The drawing shows a magnetic sensor.

The sensor contains three core terrasond 1-3, fixed the major axis of the hull the same anglesand the angles between the projections of the axes of sensitivity to the plane of the cross-section of the hull is 120. Turn any of flux-gates around the body axis ±120allows you to combine it with the other flux-gates, and therefore the axis of the body is the axis of symmetry of the sensor design. When placing the flux-gates is formed coaxially with the casing technological hole 5.

In the process, magnetometric sensor projection of the vector of the geomagnetic fieldthe axis of sensitivity of the flux-gates are converted into corresponding signals of the flux-gates. In this equation, linking the vector of signals of the flux-gates(vector signals of the sensor) with the vector of the measured field has the form:

where K is the same for all flux-gates the conversion factor, C-operator orientation of axes of sensitivity of the flux-gates, having specified in the drawing coordinate system matrix:

The vector of the geomagnetic field is determined from (1) using the inverse transformation:

and values eg the/p>The measurement error vectordue to various noise in the measurement signals of the flux-gates, largely depends on the size of the angleand increases when approaching the values 0, 90or 180when the alignment vectors of the axes of sensitivity of the flux-gates become collinear or coplanar, and the sensor inoperative. Therefore, the proposed sensor anglelie in the range [1, 90-2] and [90+2, 180-1], where tolerances1and2limited to their approximation to 0, 90and 180.

1and2determined by calculation. In particular, if the error of measurement signals of the flux-gates to accept the accuracy of Kvantovaya vectoranglesdthey can be calculated by the formula:

where N - bit analog-to-digital Converter, used for signal processing of the flux-gates. For example, ifd=1,0and N=10,19,2>4,5and anglecan be selected from the ranges [9, 85,5] and [94,5, 171].

When=±arccosi.e. the angleequal 54,73or 125,27the axis of sensitivity of the flux-gates are orthogonal and the sensor has a maximum precision. Therefore, the choice of angleyou should aspire to these values.

It should be noted that in the proposed sensor of the mutual influence of the flux-gates are practically eliminated due to the use of the thin ferromagnetic flux-gates with the other ends of the cores of adjacent flux-gates, creating the greatest distortion of the measured geomagnetic field.

Due to the presence of coaxially with the housing apertures and symmetrical arrangement of the flux-gates the proposed sensor can be used for measuring electric currents in the wires fed through the opening indicated, or for reading the magnetic labels from passing through the hole geophysical cables. In these cases, the measured values will be respectively the magnetic field of the measured currents and the magnetic field labels, and the geomagnetic field will act as interference, whose effect on the measurement results is excluded by appropriate signal processing of the flux-gates.

Magnetometric sensor is implemented on the basis of core flux-gates, produced by domestic industry.

Claims

Magnetometric sensor containing three fixed in the cylindrical housing of the same terrasond, the axis of sensitivity of which form with the longitudinal axis of the housing, equal angles, and the angles between the projections of the axes of sensitivity of the flux-gates to the plane of the cross-section of the hull is 120, ulicoten of rotation around the longitudinal axis of the housing at an angle of ±120and the values of the angles between the axes of sensitivity of the flux-gates and the longitudinal axis of the housing lie in the range [1, 90-2] and [90+2, 180°-1], where1,2- angle values due to tolerances of the dimension of the vector of the geomagnetic field.

 

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FIELD: electrical engineering; power supplied to borehole loads.

SUBSTANCE: proposed generator is characterized in that radial-axial bearing disposed at end of post on one end of stator is built of two bearings, one axial and one radial bearings, with flexible member inserted between part of frame and outer ring of one of these bearings, that additional radial bearing is installed on post at other end of stator, stuffing assembly of stator frame is disposed between end section of its movable part and post, and that it has end seal, annular cavity with radial-end collar and lubricant, as well as impeller, all mounted in tandem from additional bearing on butt-end of frame movable part.

EFFECT: enhanced reliability of generator protection against external adverse impacts.

1 cl, 2 dwg

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