Laser Components manufactures PbS and PbSe infrared detectors, supplying industrial-grade thermal detectors from their research and production facility in Arizona (US).
These detectors work on the principle that photons incident on the polycrystalline thin film promote electrons across the band gap, increasing the conductivity of the material and in turn decreasing the resistance of the substance. The polycrystalline lead sulphide (PbS) units detect radiation in the wavelength range between 1 and 3.3 microns and exhibit a higher sensitivity than polycrystalline lead selenide (PbSe), which can detect radiation between 1 and 5.2 microns.
The devices are manufactured in standard TO style packages and have long expected lifetimes, making them suitable for fit-and-forget applications, such as gas sensing, surface inspection and identifying the presence of a flame. The PB27 is a collection of thermo-electrically cooled polycrystalline biased single element PbS detectors, with a 20% cut-off at 3.3 microns and a maximum element size of 3 x 3 mm2.
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