Absolute spectrophotometer

Details Absolute spectrophotometer Absolute spectrophotometer

G - Physics

01

J

73/55

G01J 3/12 (2006.01) G01J 3/42 (2006.01)

Patent

CA 1178822

TITLE Absolute spectrophotometer ABSTRACT OF THE DISCLOSURE An improved spectrophotometer having a light source, a scanning type monochromator that provides light beams of different wavelengths over a light spectrum being scanned, and an object photometer for measuring the intensity of reflected light from an object being tested and generating an electrical signal proportional to the intensity of the light measured and connected to means for recording the signal as a function of wavelength measured, the improvement used therewith comprising: (a) a beam splitter that divides the beam exiting from the monochromator into first and second light beams, whereby the first beam is incident upon the object; (b) a reference photometer that measures the flux of the second light beam and generates an output electrical signal proportional to the intensity of the light measured, and (c) a light source control, connecting the reference photometer and the light source, which receives the electrical signal from the reference photometer and generates a feedback electrical signal to adjust the intensity of the light source to maintain the reference photometer output electrical signal level cpmstamt acrpss the light spectrum that is being scanned. The spactrophotometer is useful for determining standard color values for coatings on substrates or for any colored surface.

403903

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