They are employed in several photometric procedures . 它们在几种光度法中获得作用。
Less critical is the situation in the case of photometric observation . 做光度测量的条件就不那么严格了。
The knowledge of this quantity is of importance for photometric measurements . 这个量对于光度测量是很重要的。
Illuminance of illuminating radiation is always measured in photometric units . 照明辐射的照度通常是以光度为单位。
Atomic absorption spectrophotometry is a relatively new method of analysis . 原子吸收分光光度法是一种比较新的分析方法。
The cloud should then have an infrared luminosity thousands of times the sun's bolometric luminosity . 云的红外光度应为太阳热光度的几千倍。
Each line must contain several hundred individually identifiable halftone light values . 每一条线必须包括几百个各自认得出的用网屏表示的光度值。
Astronomers tacitly assume that stars of the same luminosity and color all have the same mass . 天文学家心照不宣地默认，光度和颜色都相同的恒星具有相同的质量。
As soon as the contracting cloud becomes opaque to its own infrared radiation, its luminosity will drop abruptly . 一旦收缩云变得对它的红外辐射不透明时，它的光度便要急剧地降低。
Paradoxical as it may seem, the value of a star's luminosity does not depend on the nuclear reactions taking place in the interior . 看来十分奇怪的是，恒星的光度竟然与发生在内部的核反应无关。
