Blackbody Radiation Source for Thermostatic Calibration Bath
As a standard device for radiation temperature measurement, the working range of radiation blackbody source directly determines the temperature range of radiation temperature verification device ( Blackbody Radiation Calibration Water Bath). In recent years, with the development of technology, a new type of low temperature blackbody radiation source appears, which makes the lower limit of radiation temperature measurement from - 20 ℃ to - 50 ℃.
The design principle of this kind of blackbody radiation source is to use the low temperature liquid as the constant temperature medium, place the black body cavity in the low temperature liquid, and make the cavity reach the constant temperature by controlling the temperature of the low temperature liquid. Because the temperature uniformity of the liquid medium can be controlled in a very small order of magnitude, the uncertainty component caused by the temperature uniformity of the cavity is reduced. The stability is generally not higher than + - 0.1 ℃ / 10min, and the effective emissivity can be controlled above 0.995. This provides a strong technical support for the accuracy of radiation temperature measurement in the low temperature range.
The working range of the blackbody radiation thermostatic water bath is basically the same as that of the standard low temperature water bath. Since the temperature uniformity and temperature control stability of the low temperature water bath are excellent, which can reduce the temperature uncertainty component caused by the isothermal characteristics of the blackbody cavity, and improve the recurrence ability of the blackbody temperature. Its temperature parameters are obviously better than that of the blackbody radiation source with constant temperature of heating wire. This kind of transformation scheme has good operability and cost performance, and is also suitable for the transformation of blackbody radiation source of other temperature standard thermostatic bath.
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