Analysis of the four major infrared detectors

Since the passive infrared detector is a kind of weak signal detection equipment, attention must be paid to some details such as height and sensitivity when installing. To properly install a passive infrared detector, you must have the following information: first, you must understand the performance characteristics of the detector, second, you must reasonably determine the installation location, and finally you must carefully debug. It cannot be said that the detector can report that it has been installed. So how to determine the installation position of a passive infrared detector?

1. Determine the normal installation angle according to the instructions

The installation height is not arbitrary, it will affect the sensitivity of the detector and the effect of preventing pets. Imagine that a detector is installed at a height of 2M and a height of 2.5, so when a moving object moves from the ground, the frequency of cutting bright and dark areas is different.

2. Should not face glass doors and windows

Passive infrared detectors are facing glass doors and windows. There will be two problems: First, white light interference. Obviously, PIR has a strong suppression function for white light, but it is not 100% suppression after all. So avoid facing the glass doors and windows, you can avoid the interference of strong light. The second is to avoid complicated environmental interference outside the doors and windows, such as crowd movement, vehicles and so on.

3. It should not be directly facing the hot and cold vents or hot and cold sources

The passive infrared detector's sensing effect is closely related to temperature changes. Both hot and cold vents and hot and cold sources may cause false alarms of the detector. For some low performance detectors, sometimes air convection through doors and windows may also cause false alarms.

4. It is not suitable to face objects that are easy to swing

Swinging objects will make microwave detectors work, so they can also cause false alarms.

The purpose of installing the detector is to prevent illegal intrusion by criminals. Before determining the installation location, the main population of the building must be considered. In fact, we prevented entrances and exits and intercepted illegal invasion lines to achieve our goals.