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This invention relates to the field of power transmission line monitoring and early warning technology, specifically an intelligent bird monitoring device and risk warning method for power transmission lines. The device includes an intelligent bird monitoring device for power transmission lines and a risk warning method using the device. The monitoring device comprises an image acquisition module, a thermal sensing module, a sound acquisition module, a motion monitoring module, an edge computing module, and a power supply module. Each acquisition module is signal-connected to the edge computing module, and the power supply module provides power to all modules. Through the collaborative work of multiple modules, comprehensive and multi-dimensional monitoring of bird activity in power transmission line areas is achieved. The early warning method is implemented through five steps: data acquisition, data processing, intelligent analysis, risk assessment, and early warning output. This invention enables comprehensive and accurate monitoring and tiered early warning of bird activity in power transmission line areas, improving monitoring efficiency and early warning accuracy, and ensuring the safe and stable operation of power transmission lines.

A smoke sensor, a shell and a smoke alarm, comprising: a shell, the shell comprising a sensor base and a sensor cover arranged oppositely; a transmitting tube and a receiving tube located in the shell; the transmitting tube is used for transmitting a light beam into the shell; the receiving tube is used for receiving the light beam; a first included angle is formed between the center line of the transmitting light beam of the transmitting tube and the sensor base; a second included angle is formed between the center line of the receiving light beam of the receiving tube and the sensor base; the transmitting light beam of the transmitting tube and the receiving light beam of the receiving tube exist an intersection point; the distance between the sensor base and the sensor cover is a sensor height; the distance between the intersection point and the sensor cover can be greater than 24% of the sensor height; the distance between the intersection point and the sensor base can be greater than 24% of the sensor height. The interference of non-smoke particles can be reduced, and the false alarm rate can be reduced.