The types of pyroelectric infrared sensors offered by 萝莉影视 largely fall into the following two types, and the sensor electrodes have polarity.
Because the suitable sensor differs depending on the install location of the set, it is necessary to select the sensor according to the install location.
The sensor electrodes must be configured according to the install location.
Dual type sensors have two electrodes. The electrodes with their own polarity on the positive side and negative side form one pair and produce one output.
Because it is sensitive to input which sequentially crosses (horizontal) the two electrodes, this type is suited to use in wall-mounted sets (human body detection from movement in the horizontal direction).
○ Configure the electrodes in the horizontal direction
Dual type sensors are good at detecting motion in the horizontal direction with respect to the detection area.
× Configure the electrodes in the vertical direction
Quad type sensors have four electrodes. Using a structure that places two dual type pairs into one package, it combines and extracts the outputs into a single output.
Because the polarities are configured in a crisscross form, the quad type sensors are also sensitive in the vertical direction in contrast to the dual type sensors. Therefore, they are suitable for use in ceiling-mounted sets that place the detection area below the sensor.
Quad type sensors are good at detecting movement from various directions with respect to the detection area.
Compared to the dual type, more detection areas can be set, allowing for slight movements to be detected more easily.
*Achieved by combining sensors with optical design.
However, caution is required when configuring the sensors if the direction of movement is fixed.
The output signal changes according to the distance.
Optical systems including Fresnel lenses must be set according to the detection distance and area where you wish to detect a human body.