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PIR Motion Sensor PaPIRs Design Concept

PaPIRs design features

The PIR motion sensors from Panasonic offer crucial advantages over conventional PIR motion sensors.
The unique design concept (explained below) ranges from the production of the pyroelectric sensing devices to the internal signal processing, thus guaranteeing an optimal detection capability and high reliability.

Easy design-in

The integrated amplifier /comparator circuit inside a TO-5 metal can (digital type) prevents interferences caused by electromagnetic fields, such as those generated by cell phones and wireless devices. A special differential circuit design is introduced for the EKMB 6μA type for applications where a high noise resistance is required (up to GHz range).

Small and fancy lens design

Thanks to the special design of the small pyroelectric elements, it is possible to use a smaller lens size while keeping the same detection area and distance compared to conventional sensors.

Two times better sensitivity

The sensitivity has been significantly improved thanks to a unique slit design of the pyroelectric elements. The separated sensing areas prevent thermal crosstalk between the single sensing elements. Therefore, reliable detection is possible even if the temperature difference between the background (e.g. floor /wall) and the target object (human) is small. (e.g.△T=4°C)

 

Temperature distribution of conventional pyroelectric sensors without slit design

 

Temperature distribution of Panasonic’s pyroelectric infrared sensors with slit design

Four times better signal-to-noise ratio

Improved signal-to-noise ratio thanks to a special I/V circuit which is used for converting a current signal from the pyroelectric element to voltage.
Panasonic PIR motion sensors perform by the feedback capacitor and the operational amplifier, different from the conventional FET-type, thereby decreasing the probability of false alarms due to temperature fluctuation.

Lead-free pyroelectric element

A ferroelectric Lithiumtantalate (LiTaO3) single lead-free crystal is used as the pyroelectric element for Panasonic PIR motion sensors. Conventional PIR motion sensors normally use a ceramic base material (e.g. PZT) for the pyroelectric element, which contains lead in many cases.

PaPIRs: High signal-to-noise ratio
 

Threshold

 

Analog output
diagram

Threshold

 
Conventional types: Low signal-to-noise ratio
 

Threshold

 

Analog output
diagram

Threshold

 

Low current consumption 〈 EKMB (WL) 〉

Reduction of current consumption (1, 2 or 6μA) thanks to the special circuit design technology allows battery life to be extended for battery-driven products.

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