SU1569810A1

SU1569810A1 - Device for setting up stable magnetic field

Info

Publication number: SU1569810A1
Application number: SU884461434A
Authority: SU
Inventors: Сергей Александрович Вызулин; Владимир Васильевич Запорожец; Николай Иванович Выродов
Original assignee: Кубанский государственный университет
Priority date: 1988-05-30
Filing date: 1988-05-30
Publication date: 1990-06-07

Abstract

Изобретение относитс к измерительной технике, в частности к устройствам стабилизации напр женности магнитного пол . Целью изобретени вл етс понижение порога чувствительности устройства. Цель достигаетс тем, что в устройство введен дополнительный электромагнит 5. Благодар выбору оптимального рабочего объема электромагнита 5 величина напр женности стабилизируемого в нем магнитного пол в несколько раз превышает величину напр женности магнитного пол электромагнита 3. Отношение напр женностей этих полей и будет величиной, на которую понижаетс порог чувствительности устройства. При этом вынесение вариометра 9 за пределы электромагнита 3 позвол ет исключить вли ние вариометра на однородность магнитного пол . 1 ил.The invention relates to a measurement technique, in particular, to devices for stabilizing the intensity of a magnetic field. The aim of the invention is to reduce the sensitivity threshold of the device. The goal is achieved by the fact that an additional electromagnet 5 is introduced into the device. Thanks to the choice of the optimal working volume of the electromagnet 5, the magnitude of the magnetic field stabilized in it is several times greater than the magnitude of the magnetic field of the electromagnet 3. The ratio of the strengths of these fields will be the value by which the sensitivity threshold of the device is lowered. Moreover, bringing the variometer 9 out of the electromagnet 3 limits the influence of the variometer on the magnetic field uniformity. 1 il.

Description

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Изобретение относитс к измеритель ной технике, в частности дл стабилизации величины напр женности магнитного пол электромагнитов.The invention relates to a measuring technique, in particular for stabilizing the magnitude of the magnetic field of an electromagnet.

Цель изобретени - понижение порога чувствительности устройства.The purpose of the invention is to reduce the sensitivity threshold of the device.

На чертеже изображена схема уст- ройс тва.The drawing shows a diagram of the device TWA.

Устройство дл создани стабильно- го магнитного пол , содержит нестабилизированный источник 1 тока, соединенный с основными обмотками 2 и 4 электромагнита 3 и дополнительного электромагнита 5, управл емый источ- ник 6 тока соединен последовательно с компенсирующими катушками 7 и 8 электромагнита 2 и 8 электромагнита 5. Вариометр 9, расположенный в рабочем объеме дополнительного электро- магнита 5 с источниками 10 питани , и стабилизированный регулируемый ис- точник 11 напр жени соединен выходами с дифференциальными входами операционного усилител 12, Выход опера- ционного усилител 12 подключен к входу управл емого источника 6 тока, замыкаема цепь отрицательной обратной св зи. Отношение числа витков основной обмотки 2 электромагнита к числу витков компенсирующей катушки 7 равно отношению числа витков основной катушки дополнительного электромагнита 5 к числу витков компенсирующей катушки 8. Рабочий объем V дополни- тельного электромагнита должен удовлетвор ть условию S/V макс, где S крутизна характеристики вариометра. 1The device for creating a stable magnetic field contains an unstabilized current source 1 connected to the main windings 2 and 4 of the electromagnet 3 and an additional electromagnet 5, the controlled current source 6 is connected in series with the compensating coils 7 and 8 of the electromagnet 2 and 8 of the electromagnet 5 Variometer 9, located in the working volume of the additional electromagnet 5 with the power supply sources 10, and the stabilized adjustable voltage source 11 are connected by outputs to the differential inputs of the operating theater. ilitel 12 Yield insulating operational amplifier 12 is connected to the input of a controlled current source 6, closable chain of negative feedback. The ratio of the number of turns of the main winding 2 of the electromagnet to the number of turns of the compensating coil 7 is equal to the ratio of the number of turns of the main coil of the additional electromagnet 5 to the number of turns of the compensating coil 8. The working volume V of the additional electromagnet must satisfy the condition S / V max, where S is the variance characteristic of the variometer . one

Устройство работает следующим образом .The device works as follows.

Claims

A stabilized current source 1 creates in the working volume of electromagnets 3 and 5 a magnetic field, the intensity of which has a constant and variable components. Controlled current source 6 creates a compensating magnetic field in the working volume of electromagnets 3 and 5, the variable component of which is equal to the variable component of the magnetic field generated by current source 1 and opposite to it in phase. When a variometer 9 is placed in the magnetic field of an additional electromagnet 5, a voltage appears at its output proportional to the strength of the magnetic field. The constant component of this voltage is equal to the output voltage of the stabilized adjustable voltage source 11, and the variable component after the gain of the operational amplifier 12 through the negative feedback circuit is fed to the input of the controlled source 6, causing a change in the current in the circuit of the compensating windings 7 and 8. Since the ratio of the quantities And the turns of the windings in both electromagnets are the same; the field strength in the working volume of the additional electromagnet is stabilized simultaneously with the field voltage stabilized in the working volume of the electromagnet. Adjusting the magnitude of the magnetic field is carried out by adjusting the magnitude of the output voltage of source P. By virtue of the choice of the optimal working volume of the additional electromagnet 5, the magnitude of the magnetic field stabilized here is several times higher than the magnitude of the magnetic field of the electromagnet 3. the strengths of these fields will be the value by which the sensitivity threshold of the device is lowered. Bringing the varimeter 9 beyond the electromagnet 3 limits the influence of the variometer on the magnetic field uniformity in the working volume of the electromagnet 3. The invention claims

A device for creating a stable magnetic field containing a current source, one output of which is connected to the first output of the main winding of the electromagnet, the compensating winding of which is connected to the first output of one of the outputs of a controlled current source, a variometer with a power source, one output connected to the control input stabilized adjustable voltage source, and another output - to the first input of the operational amplifier, the second input of which is connected to the output of the stabilized adjustable a voltage source, the output of the operational amplifier is connected to the control input of the controllable current source, characterized in that, in order to reduce the sensitivity threshold, it introduced an additional electromagnet, the main winding is connected between vto515698106

The main output winding of the electro-variometer is located in the working volume of the magnet and other source output (additional electromagnet, inflow, and the compensating winding is the ratio of the number of turns to the second output of the compensating winding to the winding of the electromagnet and other outputs of the main winding Both electromag controlled current source, with the same equal to the.