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Dual Technology sensors

Principle

Dual technology detectors link a Doppler microwave sensor and a passive infrared sensor.

Passive infrared

Any object or person naturally emits radiation in the passive infrared range, which is the ordinary heat radiated by each element.
The main difference with the active infrared lies in the fact that the radiation is not stimulated but emitted spontaneously.

A passive infrared sensor thereby detects movements by the change in temperatures in the detection field.

A Doppler microwave sensor combines the transmitter and receiver operations in a single antenna.
A microwave signal is transmitted via the antenna at a frequency of 24 GHz. This signal is reflected by the environment of the sensor and picked up by its receiver. Movement in the detection zone modifies the reflected signal. The modification is analysed and compared to the original signal.

The detection zone size is linked by the microwave signal features. In the K band (24 GHz) the signal is long and narrow.

The both technologies are sensitive to different phenomenon; passive infrared should be perturbed by heat movements, and microwave by water (rain, streaming….) or by other objects in movement. The combined use of the two technologies results in increased reliability of the system.

KAPIRIS » Dual technology » No dead zone at the foot of the detector Download the PDF datasheet The KAPIRIS design allows enclosure of complex perimeters comprised of points or zones that are difficult to protect using another technology such as infrared barriers or microwave barriers (highly variable elevation levels, cabling difficulties, etc.). KAPIRIS is a next generation dual technology detection sensor. KAPIRIS was specifically developed for long-range detection and integrates a Doppler K band microwave antenna (24 GHz) and a passive infrared sensor.