spectrum n. (pl. -tra ) 1.【物理學(xué)】譜,光譜;波譜;能譜,質(zhì)譜。 2.【無線電】射頻頻譜;無線電(信號)頻譜。 3.【心理學(xué)】(眼睛的)余像;殘像。 4.〔轉(zhuǎn)義〕范圍,幅度;(連續(xù)的)系列。 an absorption spectrum 吸收(光)譜。 a bright line spectrum 線狀光譜。 an optical spectrum 光譜。 a solar spectrum 太陽光譜。 a wide spectrum of opinion 意見的不同幅度甚大。
Microwave radiation was detected from all directions in the sky . later on , scientists realized that the origin of this radiation is cosmological . the spectrum matches with that emitted by a blackbody of temperature 3k 1965年,科學(xué)家發(fā)現(xiàn)天空任何方向皆可偵測到微波,這是一個(gè)重要的天文發(fā)現(xiàn),但研究員卻懵然不知,后來才知道這些微波來自宇宙,而這些輻射的光譜對應(yīng)于絕對溫度為3k的黑體輻射。
The article studies the reflection and radiation light spectrum of the object under the night sky light or with the aid of laser , calculates and analyzes the spectrum matching factor of typical optoelectronic cathode to the common objects and the effect on the light contrast and give the detailed mechanical design of the low light night observing instrument on helmet 摘要本文研究了夜天光照射及激光助視下的景物反射輻射光譜特性,計(jì)算并分析了典型光電陰極對常見景物反射的光譜匹配系數(shù)及其對照度、對比度等參數(shù)的影響,并詳細(xì)對頭盔式微光夜視儀進(jìn)行結(jié)構(gòu)設(shè)計(jì)。