反射密度

GB/T12822-1991摄影反射密度测量的几何条件

Geometric conditions for photographic reflection density measurement

本文讨论了摄影反射密度测量与颜色测量的原理，提出了基于光谱反射率的测量方案，将颜色测量与密度测量统一起来。

In this paper , we discussed principal of color measurement and photograph reflective density measurement , and described a measurement method based on spectrum reflectivity which can measure color and density .

光学干涉技术定量显示双马赫反射的密度场

The quantitative visualization of the density field of double Mach reflection with optical interferometer

而微泡造影剂即是一种很好的散射体，体外实验中发现，微气泡造影剂所处的周围压力增高时，其造影剂超声反射视频密度减弱。

Microbubble of contrast agent is a good scatter and in vitro experiments it appears that the acoustic density decreases as the surrounding pressure increasing .

实验研究：以灰梯尺作为原稿进行印刷，得到实验样张，采用反射式密度仪（X-Rite428型）测量其密度值，验证网点的再现特性；

Experiments research : the reappearance of dot is verified by printing gray scale to get the specimen sheet and measure the value of specimen sheet by reflection density apparatus ( X-Rite 428 );

而C值，反映的是短延时反射声声能密度的相对分布，它取决于厅的大小及形状。

The value " c " indicates the relative energy density of the reflective sounds occurring within a certain time interval , and it depends on the dimensions and the shape of the hall .

结合-密度计的措施都反射和透射密度。

Combination-A densitometer that measures both reflection and transmission densities .

分析大气湍流对光束的传播所产生的几个效应，给出激光束在大气湍流中传输的反射回波光强概率密度函数。

Based on the analysis of the effect of atmosphere turbulence on propagating laser beam , the intensity probability density function is proposed on laser reflected through atmosphere turbulence .