Comprehensive sound characteristic experimental instrument

Abstract

The invention discloses a comprehensive sound characteristic experimental instrument, which is characterized in that a transparent circular tube is provided with electric heaters and a thermometer; one end of the transparent circular tube is provided with a speaker connected with an audio signal generator in the machine and the other end thereof can reflect sound waves, thus forming standing waves; the transparent circular tube is provided with a set of movable microphone combined devices; microphones are connected with a microphone signal amplifier; and the microphone signal amplifier is connected with an audio voltmeter. The experimental instrument can find the node positions of the standing waves rapidly and conveniently by changing the positions of the microphones, thus measuring the sound characteristics or demonstrating the standing waves. The experimental instrument can also display the frequency and strength of the environmental sound and can be used as the audio signal source. The experimental instrument overcomes the troubles that the existing sound velocity measuring instruments need to be equipped with signal sources and oscilloscopes externally and can not make experiments related to relation between the sound velocity and the temperature and air pressure, is low in cost, integrally designed and convenient and reliable to use, displays sound and light synchronously and can be used for sound velocity measuring experiments or physics demonstration experiments in colleges and universities.

Description

technical field [0001] The invention relates to a physical experiment instrument, in particular to a sound characteristic comprehensive experiment instrument for physical experiments. Background technique [0002] The measurement of the speed of sound and the demonstration of the standing wave phenomenon are two very important experimental items in physical experiments, and the experimental methods are various. The commonly used experimental method for the demonstration of the standing wave phenomenon is carried out by mechanical and mechanical methods. The experimental equipment is large in size and troublesome to operate; the ultrasonic sound velocity measuring instrument is the most popular in domestic colleges and universities for the measurement of sound velocity, but the experiment must be equipped with oscilloscopes, Various instruments such as signal sources or computer virtual instruments have high experimental costs and occupy a large area, and are not intuitive in...

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Problems solved by technology

The commonly used experimental method for the demonstration of the standing wave phenomenon is carried out by mechanical and mechanical methods. The experimental equipment is large in size and troublesome to operate; the ultrasonic sound velocity measuring instrument is the most popular in domestic colleges and universities for the measurement of sound velocity, but the experiment must be equipped with oscilloscopes, Various instruments such as signal sources or computer virtual instruments have high experimental costs and occupy a large area, and are not intuitive in terms of principles and experimental phenomena, and are not interesting, and they all measure the speed of sound under normal pressure and normal temperature conditions, so other experiments cannot be done Content, single experimental method

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