The red light on the roof of the hotel room has been flashing. What is that?

The flashing instrument on the ceiling of a hotel room is usually a smoke detector. Its function is to detect whether there is smoke in the room and find the fire in time.

There is an optical maze with an infrared counter in the photoelectric smoke alarm. When there is no smoke, the infrared receiver tube cannot receive the infrared light emitted by the infrared emitter tube. When the smoke enters the optical maze, the receiving tube receives infrared light through refraction and reflection, and the intelligent alarm circuit judges whether it exceeds the threshold, and if it exceeds the threshold, it gives an alarm. So it will keep flashing.

Smoke detector is actually another name for smoke detector or smoke detector. Smoke detectors can prevent fire by monitoring the concentration of smoke. An ion smoke sensor is used inside. Ion smoke sensor is a kind of sensor with advanced technology and stable and reliable work. It is widely used in various fire alarm systems, and its performance is far superior to that of gas-sensitive resistance fire detectors.

References:

Baidu encyclopedia-smoke alarm