Method and apparatus for analyzing the concentration of materials in suspension

摘要

A spectrometer equipped with an integrating sphere is used to measure a reflection spectrum from a suspension in a container when the suspension is irradiated with measurement light, of which wavelengths are selected from a wavelength range including near infrared. Reflection spectra of a number of types of standard samples, of which concentrations in the suspension are already known, are used to prepare a measurement model in accordance with an assay technique on the basis of a recursion. A concentration of the material in the suspension is found using the measurement model.

主权项

1. A method for analyzing a concentration of one of vegetable juice and microscopic algae in a suspension, the method comprising the steps of:
using a spectrometer equipped with an integrating sphere; gaining a state where a sample container that contains the suspension of the one of vegetable juice and microscopic algae to be analyzed faces an inside of the integrating sphere through an opening of the integrating sphere; selecting wavelengths sequentially from a range of measured wavelengths of measurement light; irradiating the suspension in the sample container with the measurement light through another opening of the integrating sphere in the state; detecting light reflected from the suspension with a detector provided in the integrating sphere so that a reflection spectrum is measured; and finding the concentration of the one of vegetable juice and microscopic algae in the suspension to be analyzed from results of the measurement of the reflection spectrum and a measurement model prepared in accordance with an assay technique on the basis of a recursion using respective reflection spectra of a number of types of standard samples, of which concentrations in the suspension are already known, wherein the sample container has a thickness to allow reflected light from particles, in the suspension, adjacent to a liquid interface to return to the integrating sphere, while allowing reflected light from particles, in the suspension, distant from the liquid interface not to return to the integrating sphere.