US Patent 7940388 Spectrophotometer
Patent 7940388 was granted and assigned to Shimadzu Corp. on May, 2011 by the United States Patent and Trademark Office.
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When the apparatus is energized or a validation check is performed, a deuterium lamp 10 is turned on, and an output value resulting from an A/D conversion of the detection signal for light with a wavelength of 235 nm is obtained. A data processor 22 compares the output value with an upper limit value, which was determined and stored beforehand in a memory 24 (normally, in the manufacturing stage of the apparatus). If the output value is not less than the upper limit, a controller 25 operates an aperture driver 31 to reduce the light quantity by means of an adjustable aperture 30. This operation prevents an excessive quantity of light from reaching a photodetector 19, so that the measurement without absorption by a sample solution 18 can be correctly performed, and the absorbance by the sample solution 18 can be correctly calculated.
US Patent 07940388 Spectrophotometer US Patent 7940388 Spectrophotometer
US Patent 07940388 Spectrophotometer
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