SU531110A1

SU531110A1 - Device for measuring magnetic field

Info

Publication number: SU531110A1
Application number: SU2149491A
Authority: SU
Inventors: Владимир Яковлевич Баржин; Эдуард Борисович Крутофалов; Анатолий Федорович Лебедев; Израиль Иосифович Тартаковский
Original assignee: Харьковское Высшее Военное Командное Училище Им. Маршала Советского Союза Крылова Н.И.
Priority date: 1975-07-01
Filing date: 1975-07-01
Publication date: 1976-10-05

Description

1one

Изобретение откоситс к электронам ери-тельной технике, а именно к устройствам, предназначенным дл измерени слабых посто нных и переменных магнитных полей.The invention is inclined to electrons of a materiel technique, namely, devices designed to measure weak constant and alternating magnetic fields.

Известны измерители напр женности маг нитного пол , содержащие пьезокварцевую пластину, соединенную с генератором и ферромагнитный стержень св занный с пластиной 1. Они сложны по конструкции, недостаточно точны и малочувствительны,Magnetic field magnetic field meters are known, which contain a piezoquartz plate connected to a generator and a ferromagnetic rod associated with plate 1. They are complex in design, insufficiently accurate and insensitive,

Известны устройства дл измерени магнитных полей, содержащие чувствительный элемент в виде пьезокварцевой пластины с электродами, подключенными к автогенератору , и ферромагнитные стержни 2. , пропорциональный напр женности магнитного пол , снимаетс с кварцевой пластины . Они также малочувствительны и точныDevices for measuring magnetic fields are known, which contain a sensitive element in the form of a piezoquartz plate with electrodes connected to an oscillator, and ferromagnetic rods 2, proportional to the intensity of the magnetic field, removed from the quartz plate. They are also insensitive and accurate.

Целью изобретени вл етс повышение чувствительности элемента и точности измерени .The aim of the invention is to increase the sensitivity of the element and the accuracy of the measurement.

Это достигаетс тем, что ферромагнитны стержни закреплены в держателе и жестко св заны с торцами пьезокварцевой пластины .This is achieved by the fact that the ferromagnetic rods are fixed in the holder and are rigidly connected to the ends of the piezoquartz plate.

На чертеже представлена функциональна схема предлагаемого устройства. Пье- зокварцева пластина 1 с напыленными на основные поверхности возбуждающими электродами 2,3 слегка зажата между двум ферромагнитными магнитострикционными стержн ми 4 и 5, Стержни удерживаютс с помощью держател 6. Возбуждающие электроды соединены со схемой кварцевого автогенератора 7, обеспечивающего самовозбуждение на собственной частоте пьезокварцевой пластины, В качестве пьезо кварцевой пластины может быть применена пластина AT-среза линзообразной формы с толщинносдвиговыми колебани ми.The drawing shows a functional diagram of the device. Piezoquartz plate 1 with sprayed electrodes 2.3 on the main surfaces is slightly clamped between two ferromagnetic magnetostriction rods 4 and 5. As a piezo quartz plate, an AT-cut plate of a lenticular shape with a thickness of shear vibrations can be used.

Устройство работает следующим образомThe device works as follows

Claims

When a piezoquartz plate is turned on in a quartz oscillator circuit, oscillations occur at a frequency close to the natural frequency of the piezoquartz plate. In the presence of a magnetic field with a strength of H, ferromagnetic rods 4 and 5 change their geometrical dimensions due to the magnetostrictive effect, and there among other things. Due to the fact that the holder and the piezoelectric element are solids, the relative elongation value of ferromagnetic rods can reach a considerable value, as well as the pressure force acting on a piezoquartz plate. Under the action of pressure, the natural frequency of the piezoelectric plate will change, leading to a change in the generated frequency. The points of contact of ferromagnetic rods with piezoquartz plate should be chosen in the direction of the maximum power frequency factor. For at-cut round plates, these points should be located along the X axis of the crystal. In this case, the frequency change under the effect of pressure has a maximum value. Thus, the frequency of the quartz oscillator will vary in proportion to the intensity of the magnetic field. However, in this device, the frequency will vary not only due to a change in the magnetic field, but also due to a change in the ambient temperature (as the natural frequency of the piezoquartz plate will change with the change in the ambient temperature) and due to a change in the holder pressure. To eliminate the effect of temperature on the 5 0 frequency, the holder must be made, for example, in the form of a bracket so as to ensure the pressure constant (or a certain law of its change to compensate for the change in the natural frequency of the piezoquartz plate against temperature) of the magnettostrictive rods on the piezoquartz plate within the specified temperature range of work. Apparatus of the Invention A device for measuring a magnetic field containing a sensitive element in the form of a piezoquartz plate with electrodes connected to an oscillator and ferromagnetic rods, which is ferromagnetic in order to increase the sensitivity of the element and the accuracy of measurement. the rods are fixed in a holder and rigidly connected to the ends of the piezoquartz plate. Sources of information taken into account in the examination: 1. US Patent 35644О2, cl. 324-43 from 10,07,1971 g. 2, Avt.Svy45451212, cl. G01R 33/00 of July 6, 1973

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