这种黑物质不发光，但它远远重于银河系数以亿计的恒星，使银河系的总质量达到太阳的一至二万亿倍。
While it emits no light, this dark matter far outweighs the Milky Way's hundreds of billions of stars, giving the galaxy a total mass one to two trillion times that of the sun.
该光纤式振动计由发光二极管、光纤探头和两个光子探测器组成。
It consists of light emitting diode, an optical fiber probe, and two photodetectors.
一个发光的强度的国际单位每计画的地区与观察的线垂直。
An international unit of luminous intensity per projected area normal to the line of observation.
辅助压力和温度测量让多频相位荧光计是发光探测传感器设计、试和校准的理想选择。
Auxiliary pressure and temperature measurements make the MultiFrequency Phase Fluorometer an ideal choice for luminescence sensor design, testing and calibration.
光度计是专门用于测量发射，反射或透射光的光通量，亮度，照度或发光强度等。
Photometers are specifically designed to measure emitted, reflected or transmitted light in photometric terms of luminous flux, luminance, illuminance or luminous intensity.
用分光光度计和激光拉曼光谱仪分别测定了样品的可见光透过率和发光强度。
Spectrophotometer and Laser Roman Spectrometer have been used for determining the intensity of transmission and emission.
从激发源到样品的激发光，以及从样品到光度计的发射光均由光纤进行传导。
The light from stimulating source to the pigment sample and the emitting light from the pigment sample to the photometer are transmitted by optical fibres.
采用RF—5301PC荧光分光光度计测定激发光谱、发射光谱和磷光衰减曲线；
The photoluminescence spectra and the decay curves were recorded on RF-5301PC.
用XRD、SEM和荧光分光光度计，对试样的晶体结构、表面形貌及发光性能进行表征。
The crystal structure, surface morphology and spectral characteristics of the samples were investigated by X-ray diffraction (XRD), SEM and fluorescence spectrophotometer.
用XRD、SEM和荧光分光光度计，对试样的晶体结构、表面形貌及发光性能进行表征。
The crystal structure, surface morphology and spectral characteristics of the samples were investigated by X-ray diffraction (XRD), SEM and fluorescence spectrophotometer.
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