Based on more efficient manufacturing technologies for the IR optical image sensors, those cameras resulted in a drastic improvement of their price-performance ratio. The devices got smaller, more robust and more economic in their power consumption. For some timenow measuring thermographic systems are available, which are – similar to a traditional webcam – controlled and powered only by an USB port. IR cameras are functioning like normal digital cameras: They have a sighting area, the so called field of view (FOV), which can typically vary between 6° for a telescopic optic and 48° for a wide angle optic. Most standard optics are showing a 23° FOV. The farther the object is away, the larger the observed area will be. The good thing about it is that the radiation density is independent from the distance considering sufficient large measuring areas.īut also the part of the image is increasing which is representing a single pixel. Therefore, to a wide extend temperature measurements are not influenced by the distance to a measuring object. In the middle of the infrared range, the heat radiation can only be focused with optics made of germanium, germanium alloys, zinc salts or with surface mirrors. Those coated optics are still representing a significant cost factor in thermal imagers compared to the usual, in big volume manufactured optics for the visible light.

They are designed as spherical three lens or as aspheric two lens arrangements. Especially for cameras with exchangeable optics each optic has to be calibrated for each single pixel in order to get correct measurements. In almost all worldwide used thermographic systems, the heart of those cameras is a focal plane array (FPA), an integrated image sensor with sizes of 20.000 to 1 million pixels. CSL USB 2.0 VIDEO GRABBER DRIVER WINDOWS 10 KEYGENĬSL USB 2.0 VIDEO GRABBER DRIVER WINDOWS 10 KEYGENĮach pixel itself is a 17 x 17 μm 2 to 35 x 35 μm 2 bigmicro bolometer.

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