04029419 is referenced by 61 patents and cites 2 patents.

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.

Title
Textile color analyzer calibration
Application Number
5/621334
Publication Number
4029419
Application Date
October 10, 1975
Publication Date
June 14, 1977
Inventor
Alvin H Tong
Poughkeepsie
NY, US
Paul A Schumann Jr
Wappingers Falls
NY, US
Agent
Douglas R McKechnie
Assignee
International Business Machines Corporation
NY, US
IPC
G01N 21/48
G01J 3/50
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