CN201060582Y - Sound stationary wave phenomenon demonstrator - Google Patents

Abstract

The utility model discloses a demonstration device of the phenomenon of a standing sound wave. The device consists of a glass tube or an organic glass tube, a loudspeaker and a vocal signal generator which is connected with the loudspeaker. One end of the glass tube or the organic glass tube is closed, and the other end is provided with the loudspeaker. Small foam particles are laid in the glass tube or the organic glass tube. The utility model can clearly and visually demonstrate the phenomenon of the standing sound wave to help children better understand and master the conception of the standing wave.

Description

The sound standing wave phenomenon demonstrator

Technical field

The utility model relates to a kind of science popularization teaching demonstration device, is a kind of sound standing wave phenomenon demonstrator specifically.

Background technology

Standing wave is a kind of special interference that two opposite train wave superpositions of the direction of propagation form by amplitude, frequency, direction of vibration are all identical.When one train wave runs into the interphase of barrier or two media in the way of propagating forward, can reflect, ripple that reflects and the original phase of wave of propagating forward superpose mutually, will produce a kind of special interference, Here it is standing wave.Because this phenomenon can not be observed directly by people, is not easy to be familiar with by the student and to grasp.How to go out standing wave phenomena be to need the problem that solves in the teaching in ocular demonstration.

The utility model content

Technical problem to be solved in the utility model is to remedy the blank that prior art exists, and a kind of sound standing wave phenomenon demonstrator is provided, with visual pattern ground demonstration standing wave phenomena.

The utility model sound standing wave phenomenon demonstrator is made of glass tube or plexi-glass tubular, loudspeaker and the audio signal generator that is connected with loudspeaker, one end shutoff of glass tube or plexi-glass tubular, the other end is installed loudspeaker, is covered with the granule foam in glass tube or the plexi-glass tubular.

Loudspeaker sends the sound wave of λ=200Hz～250Hz, and organic glass is covered with the granule foam, the single sound wave of loudspeaker, increase with work power, the foam granule of very light weight produces packing phenomenon at the antinode place, and maximum antinode place piles up the highest, contiguous takes second place, and forms standing wave phenomena.Produce the condition of standing wave in the air column: the length 1 of air column is with satisfying between wave length of sound λ $l=(2n+1)\frac{\mathrm{\λ}}{4}$ The time, in air column, produce standing wave. (n=0.1,2,3......)

The utility model standing wave phenomena apparatus for demonstrating can be demonstrated standing wave phenomena in visual pattern ground, can help children's understand and master standing wave concept better.

Description of drawings

Fig. 1, be structural representation of the present utility model.

Embodiment

Below in conjunction with drawings and Examples, the utility model is described in further detail.

Embodiment: as shown in Figure 1, the sound standing wave phenomenon demonstrator constitutes an end shutoff of glass tube or plexi-glass tubular by plexi-glass tubular 1, loudspeaker 2 and the audio signal generator 3 that is connected with loudspeaker, the other end is installed loudspeaker, is covered with the granule foam in glass tube or the plexi-glass tubular.

Claims (1)

1. a sound standing wave phenomenon demonstrator is made of glass tube or plexi-glass tubular, loudspeaker and the audio signal generator that is connected with loudspeaker, it is characterized in that: an end shutoff of glass tube or plexi-glass tubular, the other end is installed loudspeaker, is covered with the granule foam in glass tube or the plexi-glass tubular.

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