Automatic spectrophotometer calibration system

Details Automatic spectrophotometer calibration system Automatic spectrophotometer calibration system

G - Physics

01

N

G01N 37/00 (2006.01) G01J 3/28 (2006.01) G01N 21/27 (2006.01) G01J 3/42 (2006.01)

Patent

CA 2061352

Abstract of the Disclosure In a spectrophotometer having an oscillating grating, an automatic calibration system is provided to ensure that the instrument constants are recomputed before each measurement of an unknown sample. In the system, whenever a reference scan is carried out, a second scan through an absorbance standard is carried out automatically and the data obtained is used to correct the instrument coefficients relating the angular position of the grating to the wavelength. The corrected coefficients are then stored to be used in the measurement of the unknown sample immediately thereafter. For near infrared spectrum measurements, the absorbance standard is a polystyrene plate. For visual measurements, the absorbance standard is a didymium plate. The didymium plate is mounted on the polystyrene plates eclipse a portion of the polysty- rene plate.

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