公开(公告)号：US3744919A

公开(公告)日：1973-07-10

申请号：US3744919D

申请日：1971-07-16

Applicant: HANSCOM G ,  MAGNUSON G ,  MAGNUSON R ,  THOMSON L ,  TRUSTEES OF THE ESTATE OF ROY

Inventor： BABB R

IPC: G01J1/16 ,  G01J3/10 ,  G01J3/51 ,  G01J3/48 ,  G01N21/48

CPC classification number: G01J3/10 ,  G01J1/16 ,  G01J3/51

Abstract: A manually operable direct reading apparatus and method providing reflectance measurements in two spectral modes, for example red and green without the use of high speed rotating filters, light choppers and synchronizing devices. The signal corresponding to one of these modes is stored in a memory for comparison with the signal from the other mode. Ratios between these modes are automatically computed and displayed either as a mathematical ratio or as a numerical value.

Abstract translation: 一种可手动操作的直接读取装置和方法，其以两种光谱模式提供反射率测量，例如红色和绿色，而不使用高速旋转滤光器，光斩波器和同步装置。 对应于这些模式之一的信号被存储在存储器中以与来自另一模式的信号进行比较。 这些模式之间的比率将自动计算并显示为数学比例或数值。