SU855561A1

SU855561A1 - Magnetometer

Info

Publication number: SU855561A1
Application number: SU792786637A
Authority: SU
Inventors: Юрий Валерьевич Бондаревский
Original assignee: Предприятие П/Я Г-4956
Priority date: 1979-06-27
Filing date: 1979-06-27
Publication date: 1981-08-15

Description

1one

Изобретение относитс к электроизмерительной технике и прежде всегц к магнитометрии.The invention relates to electrical measuring equipment and, above all, magnetometry.

Наиболее близким к предлагаемому вл етс магнитометр, который состоит из генератора то.ка возбуждени , контура измерительного преобразовател , преобразовател высокочастотного напр жени на контуре в постойнное напр жение и выводного устройства . Катушка контура измерительного преобразовател имеет сердечник на тонкой ферромагнитной пленки с одноосной анизотропией, Поле катушки направлено вдоль оси трудного намаг г ничивани пленки. Чувствительность такого магнитометра определ етс свойствами магнитной пленки и добротностью контура измерительного преоб .разовател 13Closest to the present invention is a magnetometer, which consists of a generator of the excitation circuit, the circuit of the measuring converter, the converter of high-frequency voltage on the circuit into a constant-voltage, and an output device. The coil of the contour of the measuring transducer has a core on a thin ferromagnetic film with uniaxial anisotropy. The coil field is directed along the axis of the difficult magnetization of the film. The sensitivity of such a magnetometer is determined by the properties of the magnetic film and the quality factor of the measuring circuit of the transmitter 13

В известных магнитометрах величина добротности контура измерительного преобразовател не превышает 50-55. Дальнейшее увеличение добротности ограничиваетс потер ми в тон- копленочном сердечнике и конструкцией катушки.In the known magnetometers, the quality factor of the measuring transducer circuit does not exceed 50-55. A further increase in the quality factor is limited by the losses in the thin film core and the coil design.

Цель изобретени - увеличение чувствительности магнитометра.The purpose of the invention is to increase the sensitivity of the magnetometer.

Эта цель достигаетс тем, что в магнитометре, содержащем генератор тока возбуждени , контур измерительного преобразовател с тонкопленочным магниточувствигельным сердечником катушки, преобразователь высокочастотного напр жени на контуре в посто нное напр жение н регистрирующий прибор, преобразователь высо10 кочастотного напр жени на контуре в посто нное напр жение снабжен элементом положительной индуктивной обратной св зи с контурной катушкой, выполненной в виде высокочастотной This goal is achieved by the fact that in a magnetometer containing an excitation current generator, a measuring transducer circuit with a thin film magnetically sensitive core of a coil, a high-frequency voltage converter on the circuit into a constant voltage and a recording device, a high-frequency voltage converter on the circuit into a constant voltage equipped with a positive inductive feedback element with a contour coil, made in the form of high-frequency

15 катушки.15 coils.

На чертеже показана принципиальна электрическсш схема устройства.The drawing shows a circuit diagram of the device.

Устройство содержит Кварцевый генератор 1 тока возбуждени , который The device comprises an excitation current crystal oscillator 1, which

20 через конденсатор 2 подключен к контуру измерительного преобразовател , состо щего из катушки 3 с тонкоппеночсшм магниточуьствительным сердечником 4, ось легкого, намагничивани 20 through a capacitor 2 is connected to the circuit of the measuring transducer, consisting of a coil 3 with a thin magnetic magnetization core 4, the axis of the lung, magnetization

Claims

2S of which is shown by arrow 5, n capacitor 6. One output of the circuit is connected to the base of the transistor 7, and the other to the blocking capacitor 8 and the cross-talk diode 9. The reference diode 9 in the EO is turned on through a resistor 10 connected to the power supply. The emitter of transistor 7 is connected to a parallel low-frequency filter from resistor 11 and capacitor 12. A high-frequency coil 13 is connected in series to the collector's power supply circuit with positive inductive feedback from the catutic 3 of the measuring transducer. A recording device 14 is connected to the low-pass filter. The device operates as follows. The quartz oscillator 1 of the excitation current, through the capacitor 2, supplies the high frequency Wj to the parallel oscillating circuit of the measuring transducer. Self-resonance at the frequency VQ of the circuit is chosen so that at a zero external magnetic field, the frequency of the excitation current v falls on the border of the passband (at 0.7 of the resonance value) of the contour of the measuring transducer. When exposed to an external magnetic field directed along the axis of easy magnetization of the thin-film core 4, the inductance of the coil 3 changes, which leads to a change in Wg of the circuit. As a result, the impedance of the transducer circuit for frequency NW changes. This leads to a change in the magnitude, - taken from the circuit of high frequency voltage. The voltage from the circuit is supplied to the base of the transistor 7, in the collector circuit of which the high-frequency coil 13, and due to the positive inductive feedback to the coil 3, reduces its own losses of the measuring transducer circuit, increasing its Q-factor. In the emitter circuit of transistor 7, a high-frequency voltage envelope on the circuit is extracted from resistor 11 and capacitor 12 using a low-pass filter. This envelope corresponds to a measurable magnetic field and is fixed by means of a recording device 14. Thus, in a magnetic circuit. meter increases its sensitivity by increasing the Q-factor of the measuring transducer circuit. The improvement of this characteristic of the magnetometer is achieved not to the detriment of other positive parameters and practically without complicating its design. A magnetometer comprising an excitation current generator, a measuring transducer circuit with a thin film magnetically sensitive coil core, a high-frequency voltage converter on the circuit into a constant voltage, and a recording device, characterized in that, in order to increase sensitivity, constant voltage is supplied with a positive inductive feedback element with a contour coil, made in the form of high frequencies Noah coil. Sources of information taken into account in the examination 1. Patent of Germany 1909435, class, 6 01 R 33/02, 1971.