Importance

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Abstract

An analysis instrument for measuring the quantity of a constituent present in a sample of a material comprises a housing having a sample receptacle mounted therein to receive a sample of the material. A filter assembly is mounted in the housing including a plurality of filter elements for passing a corresponding plurality of predetermined frequencies of radiant energy. A motor is provided for selectively providing relative movement between the sample receptacle and filter assembly so as to place individual ones of the filter elements into registry with the sample receptacle. A radiant energy source is mounted within the housing to direct radiant energy onto the surface of the sample through selected ones of the filter elements as each moves into registry therewith, to provide reflected radiant energy at the predetermined frequency of each of the selected filter elements. A sensor is mounted to receive the reflected radiant energy and provide electrical signals corresponding thereto. A second motor is provided for relative movement between the sample receptacle and the sensor so that the sensor receives reflected energy from a plurality of locations on the surface of the sample. Electrical circuits are provided for receiving the electrical signals from the sensor and providing a readout therefrom corresponding to the quantity of the constituent being measured.

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First Claim