SU468202A1 - Vibration Magnetometer - Google Patents

Description

(54) VIBRATION MAGNETOMETER

The invention relates to magnetic measurements and can be used when testing magnetic materials on a vibration magnetometer.

There are known receivers of the vibrating mshnitometr, consisting of an even number of at least two measuring ka-lugs placed between the electrodes of the electromagnet connected in series and oppositely, and the axes of the coils are normal to the vector of the magnetizing field.

However, known devices are characterized by .-; a significant dependence induced by e. d. in the measuring coils, both from a change in the position of the test sample along the direction of the magnetizing field vector and from a change in known geometrical dimensions with the same magnetic moment, i.e. a zone of equal sensitivity along the magnetizing field and the difficulty of obtaining them equal to sensitivity in the process of adjustment, since the process itself must be. in the selection of the distances between ocaMi: coils, which is practically non-existent11.o with the latter between the posh |. lektromagnita. 8 in particular, with ;;,: perturnal measurements of this Bozmo; -1 bone is completely excluded, since the boar is one part of the interguylar space aanKNsaet Dewar vessel.

The purpose of the invention is to expand oG.iac-application and increase the accuracy of measurements by increasing the area of different chug -, -;; the receiving device and increasing the accuracy of its setting.

This is achieved by the fact that, in addition to the measuring coils, adjustable voltage dividers and correction coils are inserted into the receiving device, which are located between the poles of the magnetizing device and the measuring coils parallel to the latter and connected to them through adjustable voltage dividers 1;

FIG. Figure 1 shows the constructive agricultural code ripe-, nj.; Rr-c: v-.oro p (.Г; с: тЕа; lin c | jr,: ,, electrical circuit of the device; on fit. 3- diagrams, If the correction coils 1-4 (see Fig. 1) are located between the poles 5 and 6 of the magnetizing device and the measuring coils 7-10 and turn on the coils in accordance with the scheme shown in Fig. 2, they are flooded The signals opposite in sign are induced by a signal in the corresponding measuring coils. The correction signal is selected by adjusting the dividers 11-14 voltage. The formation of a zone of equal sensitivity is shown in Fig. 3, where the X axis coincides with the direction of the magnetizing field. In Fig. 3, the following symbols are indicated: b, I „„ the distance to the chalk-food centers of the measuring and correcting coils, respectively; (and the signals at the output of the measuring and correcting coils, respectively; (L is the total signal of the measuring and correcting coils connected in series and counter-current; HH zone of equal sensitivity. The use of corrective coils allows, firstly, to significantly increase the length of the zone of equal sensitivity of the receiving device at any distances between the measuring coils, as well as at relatively small sizes of the latter along the direction of the magnetizing field and, secondly, to increase the accuracy and region The activation process of the receiving device, which consists in smoothly re-regulating voltage dividers. Thus, the proposed device, in comparison with the known, allows: to test samples of large geometrical dimensions; reduce random. measurement error due to the achievement of the independence of the output signal from small mixing the sample in the direction of the magnetizing field; get a gain in magnitude of the magnetizing floor with the same length of the zone of equal sensitivity of the wallpaper. devices by reducing the size of the coils along the direction of the magnetizing floor, achieved by reducing the interpolar distance. The subject matter of the invention is a vibrating magnetometer containing a vibrator, magnetizing devices in and a system of measuring coils, which is characterized by the fact that, with a circuit for expanding the field of application and increasing the accuracy of measurements, it is equipped with adjustable voltage dividers and correction coils located between the poles of the magnetizing device and measuring coils in parallel with the latter and connected with them in series and oppositely through adjustable voltage dividers.

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