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As a common measurement tool, sound level meter is widely used in the measurement of various noise environments. So, what is the working principle of the sound level meter? This article will give you a detailed analysis.
we need to understand the basic structure of the sound level meter. The sound level meter consists of a microphone, a built-in amplifier and a display. It is measured in decibels (dB) and is based on the auditory threshold of the human ear, the minimum audible sound. The sound pressure range that the sound level meter can measure is usually 20Hz to 20kHz.
So, how does the sound level meter work? Its working principle is based on the vibration characteristics of sound. It uses a microphone to convert sound into an electrical signal, which is processed by an amplifier and finally displayed on the screen.
Specifically, sound level meters use a special type of microphone called a condenser microphone. When a sound wave passes through the microphone, it causes a complex vibration pattern. These vibrations cause the capacitance value in the microphone to change. This change can be measured and converted into an electrical signal for subsequent processing. The
amplifier is another important part of the sound level meter. Since the electrical signal output by the microphone is very weak, it needs to be processed with an amplifier to obtain the signal strength required for the actual measurement. The amplifier can be connected to the microphone and display through a circuit board and cable. The
display is the final output part of the sound level meter. It shows the sound level in the current measurement environment, expressed in decibels. Most sound level meters also provide a warning system that can compare the sound level with the alarm threshold according to preset standards, thereby reminding the user whether the environment is safe.
In practical applications, sound level meters are usually calibrated and adjusted according to the sound source and measurement environment. For example, when measuring industrial noise, it can be adjusted according to the fixed noise level present in the environment. In off-field games, it can be adjusted according to the reflection and damping conditions of the field used.
sound level meter is a very practical sound measurement tool. Its working principle is based on the sound vibration characteristics and the capacitive conversion of the microphone, and the sound level is output through the amplifier and the display. In practical applications, it usually needs to be calibrated and adjusted according to the environment. I hope the analysis of this article can help you better understand the working principle of sound level meter.
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