PB50 Detects Radiation between 1 and 5.2 microns

LASER COMPONENTS is a world leading manufacturer of lead salt infrared detectors. From our research and production facility in Arizona we supply customers all over the world with these industrial grade thermal detectors.

These detectors work on the principle that photons incident on the polycrystalline thin film promote electrons across the bandgap increasing the conductivity of the material in turn decreasing the resistance of the substance. The polycrystalline lead selenide (PbSe) units detect radiation in the wavelength range between 1 and 5.2 microns.

The resistance of photoconductive detectors depends on the incident light. PbSe has a particularly strong inner photoelectric effect: When infrared light reaches the lead selenide detector, the resistance is reduced. The detectors can be used uncooled at a wavelength of up to 4.7 µm. At room temperature, they exhibit a detectivity D* of greater than 10¹⁰. At low temperatures, they achieve an even higher performance level; in addition, the wavelength shifts to 5.2 µm.

The devices are manufactured in standard TO style packages and have long expected lifetimes making them ideal for fit and forget applications such as gas sensing, surface inspection and flame detection. The PB50 device is a collection of TE cooled polycrystalline biased single element PbSe detectors that operate at room temperature with a 20% cut off at 4.9 microns and a maximum element size of 6 x 6 mm2.

Application Fields

PbSe detectors react very quickly and are thus particularly well suited for high-speed applications, such as, for example, the detection of hot spots. They are also used in medical gas analysis (CO₂ measurements), emissions measurements in the industrial field and the automobile industry, and in the measurement of moisture and hydrocarbons.

more information: www.lasercomponents.com

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