一、The Principle, Structure and Application of Infrasound Sensors

Working principle: The infrasound sensor is used to detect sound wave signals with frequencies less than 20Hz. The core principle is to convert mechanical vibration into electrical signals. Different types of sensors achieve this conversion based on different physical mechanisms. The summary of their principle characteristics, compatible models and typical application scenarios is as follows：

(Note: The data in the table was compiled by Lei Ma EMC guy. If there are any errors or omissions, please feel free to correct them.)

Recommended power management protection devices for infrasound sensors：
RS485 interface: In industrial applications, TE Connectivity 333B30 adopts the RS485 interface. Leiditech uses SM712 multiplex protection diodes for RS485, meeting IEC 61000-4-2 (ESD) ±30kV (air) and ±30kV (contact) standards.。

USB 2.0 interface: For example, the hkc-17d produced by Huakoo Electronics uses USB communication. Leiditech has adopted a single component SR05W for USB 2.0 electrostatic protection to meet IEC61000-4-2, level 4, contact discharge 30kV, air discharge 30kV, ensuring the stability of industrial transmission.。

Simulation interface: Leiditech uses S1M and GBLC24C to protect the current output of the 4-20mA sensitive sensor chip. It features small package, low capacitance, and large current protection. It meets IEC 61000-4-2, level 4, with contact discharge of 30kV and air discharge of 30kV.。

I2C/SPI interface: Leiditech adopts SMC12 to protect the I2C and SPI interfaces. Each chip can protect 2 differential lines, saving space and providing large current protection. It meets IEC61000-4-2, level 4, with 8kV contact discharge and 15kV air discharge.。

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