How the sound sensor works and how it works

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The sound sensor acts like a microphone (microphone). It is used to receive sound waves and display a vibrating image of the sound. But can't measure the intensity of noise

working principle

The sensor incorporates a sound-sensitive capacitive electret microphone. The sound waves vibrate the electret film in the microphone, causing a change in capacitance and a small voltage corresponding to the change. This voltage is then converted to a voltage of 0-5V, which is accepted by the data collector via A/D conversion and transmitted to the computer.

use

A. The sensor does not need to be calibrated again, and the software automatically zeros.

B. The sampling frequency should be 10,000 times/second or more, otherwise the image of the acoustic vibration cannot be reflected accurately and accurately.

C. The ordinate of the image represents the voltage value corresponding to the acoustic vibration.

D. Access control system can use 4~20mA output type sensor, such as Sichuan ZS series

E. If there is a limit on the cost, positive and negative signals can be used, such as: TZ-2KA, etc.

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