| 摘要 |
An interference filter transmission wavelength scanning photometer wherein the angle of inclination of an interference filter (3) is periodically varied, the wavelength of the light to be transmitted is modulated with the periodical variation centered at the maximum absorption wavelength of the interesting component, the variation of the intensity of the light transmitted through a sample is extracted by an infrared sensor (11) as an electrical signal. The time between the rise and fall zero cross points of the AC component of the electric signal is determined by a microprocessor (16), the ratio (T-2T1)/T. is calculated from the full period T (time for every other zero cross point of the AC component) and half period T1 (the time for every zero cross point of the AC component) obtained from the above determined time, and the concentration of the interesting component is determined from the variation of the result of the calculation of the ratio, thereby quantitatively determining the component without interfering of the coexistent components.
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