![]() ![]() A separate built-in temperature indicator and platinum resistance contact thermometer (both included) provide an accurate reference measurement of the cavity temperature. The infrared radiation emitted from the cavity can then be used to calibrate a non-contact temperature sensor whose field of view is aimed through the centre of the aperture. Cooling elements in the BB982 allow the unit to reach temperatures below ambient. This can be helpful when calibrating thermal imagers.Ī heating block heats the thermal cavity to the temperature selected on the built-in controller. We can supply optional orifice plates which restrict the cavity aperture further. The cavity surfaces are covered with pigmented paint which gives a very high emissivity of 0.995 at the aperture. These blackbodies consist of a temperature-controlled cylindrical thermal cavity which has a small aperture at one end. They are supplied with a PC interface, software and a 3-point traceable calibration certificate. Both have outstanding stability (☐.1☌) and a built-in temperature indicator with high resolution (0.01☌). The two models differ in their temperature range, being 30☌ to 550☌ (BB976) and -10☌ to 80.0☌ (BB982). These models are ideally situated in a calibration room or laboratory where a stable ambient temperature allows you to take full advantage of their performance, although the built-in carrying handle does allow them to be moved around the site if required. The emissivity setting of the sensor should be adjusted to match the emissivity of the blackbody, and the sensor should be mounted close enough that the measured spot diameter is no larger than half the aperture diameter.Ĭalex offers a range of blackbodies for different applications: BB976 and BB982 Blackbody Calibration Sourcesįor very accurate calibration checks, the BB976 and BB982 blackbody sources provide the highest performance. It completely absorbs and emits all radiation (it is extremely non-reflective) and has an emissivity value of 1.īecause there no material exists that could make a true perfect blackbody, in practice a blackbody calibration source always has a slightly lower emissivity than 1, however by careful design it is possible to get very close. it emits thermal (visible and infrared) energy whose intensity at a given wavelength and temperature follows Planck’s Law of radiation. It consists of a heated (or cooled) target object whose temperature is precisely known, and is the basis for accurate calibration of infrared pyrometers.Ī blackbody is an ideal radiator i.e. What is a Blackbody Calibration Source?Ī blackbody calibration source is a tool for checking the calibration of an infrared temperature sensor. This article explains what makes the best blackbody calibration source for a given application and what you should consider when choosing one. ![]() ![]() Blackbody calibration sources from Calex allow the calibration of infrared temperature sensors with low uncertainty. ![]()
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