Infrared Sensors of Smartec: functional description

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INFRARED Sensors
FUNCTIONAL DESCRIPTION
The output voltage is generated by a thermopile, formed by a series connection of thermojunctions deposited on a silicon substrate. The hot junctions are thermally isolated from the cold junctions on the substrate by etching an extremely thin membrane. A black absorbing layer on the hot junctions transform the incoming radiation into heat. A voltage proportional to the radiation is generated by the thermoelectric effect.

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	The used thermopiles are processed on 400 mm silicon substrates using BiSb and NiCr for the thermojunctions. For different radiation spectra various filters are available to get the optimal solution. Easy and accurate measuring of the sensor temperature can be done with a built-in temperature sensor (only for type SMTIR9902). The diagram shows the SMT IR 9902 responsiveness as function of the incoming wavelength. For more info on the SMARTEC Infrared Sensors have a look at: Product Description Most Important Features and Typical Applications Datasheets (in pdf format)