Foucault pendulum demonstration device

Abstract

The invention discloses a foucault pendulum demonstration device. The foucault pendulum demonstration device comprises a simple pendulum, a permanent magnet, an optoelectronic switch, a PLC, a relay and an electromagnetic coil, wherein the simple pendulum is provided with a pendulum line and a pendulum ball, one end of the pendulum line is fixed, the other end of the pendulum line is connected with the pendulum ball, and the period of the simple pendulum is T; the permanent magnet is mounted on the pendulum ball; the optoelectronic switch is used for detecting that whether the pendulum ball passes by above, and when the pendulum ball passes by, the intensity change of light between a transmitting end and a receiving end of the optoelectronic switch is converted into the change of current; the PLC is used for receiving electrical signals of the optoelectronic switch and generating a corresponding control instruction; the relay is used for receiving the control instruction for switching on or off the PLC, and making corresponding movement; the switching on or off of a power supply of the electromagnetic coil is controlled by the relay, and the electromagnetic coil is used for attracting the permanent magnet on the pendulum ball, and providing compensation force for the pendulum ball. The foucault pendulum demonstration device realizes the long-time swing and can be observed for a long time, the experimental phenomenon is continuous and repeated so as to be easily captured, the whole structure is high in stability, the long-time circular demonstration is satisfied, and the display effect is good.

Description

technical field [0001] The present invention relates to a device used in scientific and educational experiments and recreational activities. More specifically, the present invention relates to a Foucault pendulum demonstration device for scientific and educational experiments. Background technique [0002] In order to prove that the earth is rotating, French physicist Foucault (1819-1868) conducted a successful swing experiment in 1851, hence the name of Foucault's pendulum. The experiment was carried out under the highest dome of the Pantheon in Paris, France. The pendulum is 67 meters long and the pendulum weighs 28 kilograms. The suspension points are specially designed to minimize friction. This kind of pendulum has large inertia and momentum, so it is basically not affected by the rotation of the earth and swings by itself, and the swing time is very long. In the Foucault pendulum test, people can see that the swing plane rotates slowly clockwise during the swing pr...

AI Technical Summary

Problems solved by technology

[0004] The Foucault pendulum used for scientific and educational experiments in the prior art has the following disadvantages: 1. The operation is cumbersome and complicated, and the realization phenomenon is not easy to observe; The experimental phenomenon is not easy to capture; 3. The stability of the whole structure is low, it cannot meet the long-term cyclic demonstration, it is easy to be damaged, and the repair rate is high

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