computer hardware, consumer electronics, electronic components  

Thermal imaging camera

Thermal cameras produce visible images representative of the thermal intensity of viewed scenes. Thermal imaging cameras are based on the detection and discrimination of infrared (IR) radiation. The thermal imaging process is based on IR radiation that is emitted from all non-reflective objects, where the amount of IR radiation emitted increases as the temperature of the object increases. Infrared cameras detect infrared radiation emitted by the objects of a scene, and generate an image of the scene from the detected radiation. The infrared radiation absorbing layer generates heat in response to incident infrared radiation, and a temperature change occurs in the temperature sensor. The temperature sensor exhibits a variation in its physical characteristics such as electrical resistance, in response to a change in temperature. The infrared imager senses the variation in electrical resistance as a current change or a voltage change, and outputs an electrical signal in response to the infrared radiation. Depending on the substance used, ferroelectric type, pyroelectric type and capacitance type temperature sensors are used. Many thermal imaging cameras use ferroelectric thermal imaging. Ferroelectric cameras are solid-state infrared imagers that measure changes in heat by sensing changes in capacitance. The focal plane includes a plurality of small ceramic pixels that are made of sensing materials such as barium strontium titanate.


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