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Pyroelectric Detectors & Sensors for Far Infrared, FIR (5.0 µm-15 µm)

Excelitas offers a wide range of Pyroelectric Detectors in Single Element, Dual Element and Quad Element designs. To satisfy a broad range of applications, we provide various element geometries, filters and housings.

With the addition of the new DigiPyro® Family, setting the standard in digital motion and presence detection, we have successfully begun helping our customers convert analog detectors to digital. Our latest DigiPyro innovations include the “Smart” DigiPyro, for integrated motion electronic circuitry. With Excelitas, you are not limited to off-the-shelf designs; customized designs are also possible.

For a standard Dual Element Detector, the signals are in the range of 3000 V/W. That means the infrared radiation of a person moving at a speed of 1 m/s with a distance of 10 m from the detector generates a signal of some mV. Output signals can be analog as well as digital.

Pyroelectric Detectors utilize the “Pyroelectric Effect” for non-contact radiation measurement. Several types of crystals create charges on the surface, induced by temperature changes in the material that cause a change in the polarization of the sensor material. Whenever a change occurs in the radiation that is absorbed on the top surface of the sensitive material, the temperature of the material changes and the Pyroelectric Detector generates a signal. Using an IR filter allows one to select the sensitive wavelength range. If the radiation does not change, the temperature of the crystal will reach equilibrium and the Pyroelectric Element will discharge.