Standing wave demonstration method

Abstract

The invention discloses a standing wave demonstration method. The method comprises the steps that a. a standing wave demonstration device is designed; b. an ultrasonic atomization module is turned on to ultrasonic-atomize liquid into fogdrops, and the fogdrop are introduced into a cylinder through a fogdrop inlet tube; and c. a sound wave generating device and a frequency converter are turned on, and the frequency converter is controlled to adjust the frequency of sound waves emitted by the sound wave generating device. According to the standing wave demonstration device, the right end of the cylinder is provided with the sound wave generating device; the frequency converter is connected with the sound wave generating device; the left end of the cylinder is connected with the ultrasonic atomizing module through the fogdrop inlet tube; an elongated ejection notch is axially arranged at the upper part of the cylinder wall; and a transparent baffle plate is symmetrically arranged on front and rear sides of the elongated ejection notch. According to the invention, a traditional demonstration instrument which displays standing waves by igniting a combustible gas is abandoned; the fogdrops after ultrasonic atomization are used to display the standing waves; safety hidden fire trouble can be avoided; and the cylinder is prevented from burning hot.

Description

technical field [0001] The invention belongs to the field of physical experiments, in particular to a standing wave demonstration method. Background technique [0002] Such as figure 1 As shown, the existing standing wave demonstration device includes a cylinder 1 and a frequency modulator 5, wherein the two ends of the cylinder 1 are sealed, and the left end of the cylinder 1 is connected with the combustible gas supply device 3 through the air inlet pipe 2, and the upper part of the cylinder 1 is along the A row of ejection branch pipes 1a is provided at equal distances in the axial direction, and both the cylinder 1 and the ejection branch pipes 1a are metal pipes. The right end of the cylinder 1 is equipped with a sound wave generating device 4 which is connected with the frequency modulator 5 . [0003] The method corresponding to the above-mentioned standing wave demonstration device is as follows: the combustible gas supply device 3 delivers combustible gas (such as...

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Problems solved by technology

[0005] 1. Due to the use of flammable gas to demonstrate standing waves, this will lead to two main problems. One is that the safety of indoor demonstrations is poor, and safety accidents are prone to occur; the other is that cylinder 1 and The ejection branch pipe 1a will be very hot. In order to achieve cooling, it must be stopped after a period of demonstration, and the demonstration will be performed after the cylinder 1 and the ejection branch pipe 1a are completely cooled, so that it cannot be used continuously;

[0006] 2. The existing demonstrator is equidistantly equipped with a group of ejection branch pipes 1a, so that only the peaks and troughs can be seen, and continuous waveforms cannot be formed, which leads to the need to improve the demonstration effect

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