公开(公告)号：FR2327524A1

公开(公告)日：1977-05-06

申请号：FR7626308

申请日：1976-08-25

Applicant: IBM

Inventor： SCHUMANN PAUL A JR ,  TON ALVIN H

IPC: G01J3/51 ,  G01J3/00 ,  G01J3/02 ,  G01J3/50 ,  G01N21/27 ,  G01N21/55 ,  G01J3/34 ,  G01J3/46 ,  G01N21/48 ,  G01N33/36

Abstract: A spectrophotometer is operative to measure or analyze the colors of materials such as textiles. A test sample is held by a holder and is illuminated by polychromatic light. Diffuse light reflected from the sample is collected and converted to variable monochromatic light and detected. The system is calibrated by using a secondary white standard calibrated against a primary white standard, by using a black standard to compensate for dark current and internal reflectance from a pressure plate, and by using a mirror to obtain internal wall reflectance used in a correction factor.