Optically based measurement of fluid parameters
AssigneeCommonwealth Scientific and Industrial Research Organization
InventorClive K. Coogan
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Abstract
Optical measurement apparatus includes a cell (12) adapted to receive fluid for testing and a light source (16) arranged to direct an incident light beam (5) into the cell. A hollow intergration sphere (14) and light-sensitive detector (26) are provided to detect at least a pre-determined portion of light emitted by a segment (13) of the cell transversely of the direction of said incident light beam. The light source (16) and the cell (12) are arranged so that the light incident on the cell is not collimated but, as it traverses segment of the cell, is confined to the cell by total internal reflection, unless otherwise scattered by particles in the cell.
Claims8
Optical measurement apparatus comprising:
- an elongate tubular sample cell (12) adapted to receive fluid for testing;
- a light source (16) arranged to direct an incident light beam into the cell;
- and
- hollow light integration means (14', 26') about said cell to detect at least a pre-determined portion of light emitted by the cell transversely of the direction of said incident light beam, said cell being transparent to such emitted light;
- wherein the light source and the cell are arranged so that said incident light beam is not collimated but, as it traverses said cell, is confined to the cell by total internal reflection, unless otherwise scattered by particles in the cell;
- and wherein said tubular sample cell is coiled within said light integration means so as to substantially increase the path length of the incident light beam within the light integration means.
Dependencies are inferred from the claim text.