公开(公告)号：US3874799A

公开(公告)日：1975-04-01

申请号：US36609073

申请日：1973-06-01

Applicant: COLOR CONTROL INC

Inventor： ISAACS DAVID ,  FRIED DAVID L ,  AMEER GEORGE A

IPC: G01J3/28 ,  G01J3/46 ,  G01J3/34

CPC classification number: G01N21/474 ,  G01J3/0202 ,  G01J3/021 ,  G01J3/0251 ,  G01J3/2803

Abstract: Reflectance measurements of a color sample are made by employing a diffusing sphere having target ports for a color sample, a white standard and a black body. A mirror is mounted within the sphere for pivotal motion about the axis of an exit port to sequentially reflect light from the several targets along a common optical path into a polychrometer which disperses the received light into its spectrum and projects the spectra upon a sensor surface. The sensor may be in the form of an array of light-sensitive elements or the face of an image tube that is scanned or sampled at selected wave lengths of points of the spectrum to be employed in the reflectance measurement. For each sample point, the intensity of light reflected from the black body is subtracted from the intensity of light reflected from the sample and is also subtracted from the intensity of light reflected from the white standard to thereby correct both the sample and white standard measurement for both electrical and other noise of the system, and for stray light within the optical path that impinges upon the sensor surface. The ratios of intensities of the sample to the standard provide reflectance values that may be employed in various color measurements, including calculations of tristimulus values and chromaticity coordinates.

Abstract translation: 通过使用具有用于颜色样本，白色标准和黑体的目标端口的漫射球来进行颜色样本的反射率测量。 镜子安装在球体内，用于围绕出口的轴线枢转运动，以将来自多个目标的光沿着共同的光路顺序地反射到多光谱仪中，该光谱仪将接收的光分散到其光谱中并将光谱投影到传感器表面上。 传感器可以是光敏元件阵列的形式或者在反射率测量中要采用的频谱的所选波长的长度被扫描或采样的图像管的面。 对于每个采样点，从从样品反射的光的强度中减去从黑体反射的光的强度，并从白色标准反射的光的强度中减去，从而校正样本和白色标准测量 系统的电气和其他噪声，以及撞击传感器表面的光路内的杂散光。 样品的强度与标准的比率提供可用于各种颜色测量中的反射率值，包括三刺激值和色度坐标的计算。