【摘要】 报道了所研制的大开孔三段加热中温黑体炉腔体热源布置原则。利用靶后腔体控制靶温可使黑体空腔在各个工作温度(50—1200℃)范围内保持均匀,在280mm腔体有效长度内最大分布温差在2℃以内。利用区域近似拟合迭代法计算了腔体有效发射率分布,计算结果表明,大锥角(148.28°)靶面上各点有效发射率值近似相等,其值为0.9985。更多还原

【Abstract】 Describes the layout of heating sources in a moderate-temperature blackbody furnace we developed with big opening and 3-Zone heating. To enable its temperature to be uniformly distributed in its different working temperature ranges from 50 to 1200℃,the cavity in rear of the target is used to control target tem perature. Thus the greatest difference distributed along the efficient length of cavity(280mm) is within 2℃.The effective emissivities distribution in cavity is calculated using the method of zonal iterating approximation with curve fit. the result shows the values of effective emissivities of different points on the surface of a pyrometric target of large apex angle up to 148.28°are approximately all equal, i.e., 0.9985.更多还原