The core component of infrared induction lamp is a pyroelectric infrared sensor, which is sensitive to the infrared emitted by living things and can output a switching signal after receiving it. In order to increase its working distance (improve sensitivity), a hemispherical Fresnel lens is usually arranged in front of it.

The pyroelectric infrared induction switch can be made into an integrated infrared induction lamp together with lamps; It can also be placed on the lintel of the automatic door to control the opening and closing of the door leaf; Specific location alarms in banks are also used to detect intruders-just for detection and alarm, unlike surveillance cameras.

Blocking the Fresnel lens with a thick plate can make the lamp unable to detect infrared rays, but it is not easy to operate. If it is necessary to change its function, it is better to replace ordinary lamps directly.