Concentration measuring instrument, and method of measuring the concentration of a specific component in a subject of measurement
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United States of America Patent
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Jan 23, 2007
Grant Date -
Dec 23, 2004
app pub date -
Mar 18, 2003
filing date -
Mar 19, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
To provide a measuring method which enables a highly accurate measurement of concentrations of specific components in subjects of measurement even when the concentration measuring contact of a concentration measuring instrument is contaminated with drinks or the like.The concentration measuring instrument includes:a main body that has a concentration measuring contact, a light source and a photodetector; andjudging means that calculates the difference between a non-contact-measured value, a value, measured by the photodetector while keeping a subject of measurement out of contact with the concentration measuring contact, of the quantity of light that is emitted and entered by the light source into the concentration measuring contact and returned to the concentration measuring contact and a predetermined reference value obtained in advance by making measurement while keeping the concentration measuring contact clean and judges whether the calculation of the concentration of the specific component in the subject of measurement is effective or not by comparing the calculated difference with a predetermined threshold.
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