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研制了一种重力式热管黑体辐射源。热管系统中冷凝段居上,把黑体空腔作为热管冷凝段的一部分,冷凝液靠重力经绝热段回流到设置在下部的蒸发段。本黑体的工作温度范围是40～150℃,故选择水/铜型热管。在研究中采用φ0.3mm二等标准铜康铜热电偶测量了黑体空腔内壁面的温度分布。测量结果表明,在双锥腔体内腔体壁面的最大温差在0.4～0.6℃以内。采用Bedford方法并引用作者导出的微元环对同轴全照区和半照区圆盘辐射角系数公式计算了腔体有效发射率分布。计算结果表明,在经常被瞄准的靶面上有效发射率为0.9995以上。
Developed a gravity heat pipe blackbody radiation source. In the heat pipe system, the condensation section stays above the blackbody cavity as part of the heat pipe condensation section, and the condensate flows back to the evaporation section arranged at the lower part by gravity through the insulation section. The working temperature range of the black body is 40 ~ 150 ℃, so the choice of water / copper heat pipe. In the study, the temperature distribution of the inner wall of the blackbody cavity was measured by the copper-copper thermocouple of φ0.3mm second-class standard. The measurement results show that the maximum temperature difference in the wall of the double cone cavity is within 0.4 ~ 0.6 ℃. The effective emissivity distribution of the cavity was calculated by the Bedford method and the derivation of the radiation radius coefficient formula of the coaxial full illumination area and the semi-illumination area disc derived by the author. The calculated results show that the effective emissivity of the targeted target surface is above 0.9995.