Kelly F J
U.S. Naval Ordnance Laboratory,Silver Spring, Maryland, USA.
Appl Opt. 1966 Jun 1;5(6):925-7. doi: 10.1364/AO.5.000925.
An exact, closed-form expression is derived for the apparent local emissivity of a point at the vertex of a diffuse conical or V-groove cavity. This expression is obtained by a substitution into an approximate equation for the apparent local emissivity of a point within a cavity of any shape. The exact expression depends only on the emissivity of the cavity wall material and the angle factor between the point at the cavity vertex and the cavity opening. The values predicted by this expression agree well with those obtained from a numerical solution of the integral equation characteristic of a diffuse conical cavity.
推导出了漫射圆锥形或V形槽腔顶点处一点的表观局部发射率的精确闭式表达式。该表达式是通过将其代入任意形状腔体内一点的表观局部发射率的近似方程而得到的。精确表达式仅取决于腔壁材料的发射率以及腔顶点处的点与腔开口之间的角系数。该表达式预测的值与从漫射圆锥形腔的积分方程的数值解中获得的值非常吻合。
