Interference filter transmission wavelength scanning photometer
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United States of America Patent
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-
Jun 8, 2004
Grant Date -
Dec 19, 2002
app pub date -
Oct 26, 2001
filing date -
Feb 28, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An interference filter transmission wavelength scanning photometer operable to determine the concentration of an interesting component in a sample without interference from coexisting components by measuring the light absorption of the interesting component. An angle of inclination of an interference filter varies periodically and is centered at the maximum absorption wavelength of the interesting component. The wavelength of a transmitted light is modulated due to the periodical variation of the angle of inclination. Variation in the intensity of the light transmitted through a sample is extracted by an infrared sensor as an electric signal. The time between rise and fall zero cross points of an AC component of the electric signal is determined by a microprocessor. A ratio is calculated from a full period and a half period of the AC component. The concentration of the interesting component is determined from a variation in the calculation of the ratio.
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