Automatic spectrophotometer calibration system
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United States of America Patent
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Oct 5, 1993
Grant Date -
N/A
app pub date -
Mar 7, 1991
filing date -
Mar 7, 1991
priority date (Note) -
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status (Latency Note)
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Abstract
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 polystyrene plate.
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