SU987661A1

SU987661A1 - Device for demonstrating magnetostriction effect

Info

Publication number: SU987661A1
Application number: SU813312502A
Authority: SU
Inventors: Дмитрий Семенович Кройтор
Original assignee: Кишиневский государственный медицинский институт
Priority date: 1981-07-06
Filing date: 1981-07-06
Publication date: 1983-01-07

Description

Изобретение относится к устройствам для демонстрации опытов по физике.The invention relates to devices for demonstrating experiments in physics.

Известно устройство для демонстрации магнитострикционного эффекта, включающее катушку, внутри которой ⁵в нижней части укреплен сердечник в виде биметаллической пластины, верхний конец которой снабжен указателем магнитострикции в виде неболь- ₁₀шого зеркальца [ΌИзвестное устройство имеет недостаточную наглядность демонстрации, например четности эффекта магнитострикции. ₁₅ A device for demonstrating the magnetostrictive effect is known, including a coil inside which a core in the form of a bimetallic plate is fixed at the bottom ⁵ , the upper end of which is equipped with a magnetostriction indicator in the form of a small _10- sided mirror [Ό The known device has insufficient visualization of the demonstration, for example, the parity of the magnetostriction effect. _fifteen

Цель изобретения - повышение наглядности демонстрации магнитострикционного эффекта.The purpose of the invention is to increase the visibility of the demonstration of the magnetostrictive effect.

Указанная цель достигается тем, что устройство для демонстрации магнитострикционного эффекта, включающее катушку, закрепленный в катуш- ке сердечник и указатель магнито2 стрикции, имеет пьезодатчик, установленный на торце сердечника, и звуковой генератор, к выходу которого подключена катушка, при этом указатель магнитострикции выполнен в ⁵ виде электронного осциллографа, к входу которого подключен пьезодатчик, а к входу X через ключ подключена катушка.This goal is achieved by the fact that the device for demonstrating the magnetostrictive effect, including a coil, a core fixed in the coil and a striction magnet2 indicator, has a piezoelectric sensor mounted on the end of the core and a sound generator, to the output of which a coil is connected, while the magnetostriction indicator is made in ⁵ as an electronic oscilloscope, to the input of which a piezoelectric transducer is connected, and a coil is connected to input X through a key.

На фиг. 1 изображена схема устройства} .на фиг. 2- излучатель с кольцевым магнитом.In FIG. 1 shows a diagram of a device}. FIG. 2- emitter with a ring magnet.

Устройство состоит из катушки 1, сердечника 2, установленного на его торце, пьезодатчика 3, подключенного к входу У электронного осциллографа 4, вход X которого подключен через ключ 5 к катушке 1,- которая под. ключена также к выходу звукового ге2о нератора 6. Кольцевой магнит 7 Установлен на нижнем конце катушки 1.·The device consists of a coil 1, a core 2 mounted on its end, a piezosensor 3 connected to the input U of the electronic oscilloscope 4, the input X of which is connected through the key 5 to the coil 1, which is under. also connected to the output of the sound generator 6. Ring magnet 7 Installed at the lower end of coil 1. ·

Демонстрацию проводят следующим ’ образом.The demonstration is carried out as follows.

Включают в сеть звуковой генератор 6 и электронный осциллограф 4. При отключенном ключе 5. на экране осциллографа 4 наблюдают колебания, возникающие в пьезодатчике под воздействием магнитострикционного эффекта сердечника 2.The sound generator 6 and the electronic oscilloscope 4 are connected to the network. With the key 5. turned off, oscillations arising in the piezoelectric sensor under the influence of the magnetostrictive effect of the core 2 are observed on the screen of the oscilloscope 4.

Меняя частоту звукового генератора 6, добиваются максимальной амплитуды этих колебаний, т^е. настраивают систему в резонанс.By changing the frequency of the sound generator 6, they achieve the maximum amplitude of these oscillations, m ^ e. tune the system to resonance.

Затем отключают развертку осциллографа 4 и замыкают ключ 5. При этом на экране появляется фигура Лиссажу в виде восьмерки. Это служит прямым подтверждением того, что частоты складываемых взаимно перпендикулярных колебаний отличаются вдвое< т«е. подтверждается четность эффекта магнитострикции . 20 вают кольцевой магнит 7. При этом фигура на экране преобразуется в эллипс большего размера, чем предыдущая восьмерка.Then turn off the sweep of the oscilloscope 4 and close the key 5. In this case, the figure of Lissajous in the form of a figure eight appears on the screen. This serves as a direct confirmation of the fact that the frequencies of the mutually perpendicular oscillations are twofold <m <e. the parity of the magnetostriction effect is confirmed. The ring magnet 7 is formed 20. In this case, the figure on the screen is transformed into a larger ellipse than the previous figure eight.

Это наглядно иллюстрирует тот факт, что при подмагничивании частота колебаний сердечника 2 совпадает с частотой, вызывающей эти колебания.This clearly illustrates the fact that when magnetizing, the oscillation frequency of the core 2 coincides with the frequency that causes these oscillations.

Применение изобретения в учебном процессе позволит существенно повысить качество усвоения теоретических знаний по физике - явления магнито5 стрикции.The use of the invention in the educational process will significantly improve the quality of assimilation of theoretical knowledge in physics - the phenomenon of magnetostriction.

Claims

The invention relates to devices for the demonstration of experiments in physics. A device for demonstrating a magnetostrictive effect includes a coil, inside of which a core in the form of a bimetallic plate is fixed in the lower part, the end of which is provided with a pointer of magnetostriction in the form of a small mirror lj. The known device has insufficient demonstrability, for example, the parity of the magnetostriction effect. The purpose of the invention is to increase the consistency of the demonstration of the magnetostriction effect. This goal is achieved by the fact that the device for demonstrating the magnetostriction effect, including a coil, the core and the magnetostriction indicator fixed in the coils, has a piezoelectric sensor mounted on the end face of the core, and a sound generator, to the output of which the coil is connected, the magnetostriction indicator is made in the form of an electronic an oscilloscope, to the input of which a piezoelectric transducer is connected, and a coil is connected to the input X via a switch. FIG. 1 shows a diagram of the device}. In FIG. 2- emitter with ring magnet. The device consists of a coil 1, a core 2 mounted on its end, a piezo sensor 3 connected to the input of an electronic oscilloscope i whose input X is connected via key 5 to the coil 1, which is also connected to the output of the sound generator 6. The ring magnet 7 is set to the lower end of the coil li. The demonstration is carried out as follows. 39 A sound oscillator 6 and an electronic oscilloscope are included in the network. When the key is turned off 5. on the oscilloscope screen 4, oscillations occurring in the piezo sensor under the influence of a magnetostrictive effect of the core are observed

2. Meng the frequency of the sound generator 6, achieve the maximum amplitude of these oscillations,. tune the system to resonance. Then turn off the scan of the oscilloscope A and close the key 5. At the same time, a figure of eight appears on the screen of Lissajous. This serves as a direct confirmation that the frequencies of the added mutually perpendicular vibrations differ two times, i.e. the parity of the magnetostriction effect is confirmed. A ring magnet 7 is emitted. At the same time, the figure on the screen is converted into an ellipse larger than the previous figure eight. This is clearly illustrated by the fact that when the magnetization is switched, the oscillation frequency of core 2 coincides with the frequency causing these oscillations. The use of the invention in the educational process will significantly improve the quality of assimilation of theoretical knowledge in physics - the phenomenon of magnetostriction. Apparatus of the Invention A device for demonstrating a magnetostrictive effect, including a coil, a core fixed in the coil, and a magnetostriction indicator, characterized in that, in order to increase its consistency, it has a piezoelectric transducer mounted at the end of the core, and a sound generator, to the output of which the coil is connected, at the same time, the magneto-drift indicator is made in the form of an electronic oscilloscope, to the input of which a piezoelectric transducer is connected, and to the input X A coil is connected via a key. Sources of information taken into account in the examination, 1. Lecture demonstrations in physics. Ed. V.I.Ivernova. M., 1972, p. fig 596.

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