Double multichromatic photometer with a single light-source and a single detector, particularly for performing chemical and clinical analyses

Claim 1

A multichromatic double photometer particularly suitable for chemical and clinical analyses, wherein the photometer comprises a single light-source; a single detector; a first measuring optical path and a second measuring optical path from the light source to the detector for carrying out measurements, each optical path comprising a reflection mirror and a collimating optical assembly; a reference optical path from the light source which reaches directly the detector after passing through a neutral density filter; a rotary drum inserted in the first and second measuring optical paths, and bearing a plurality of interference filters arranged in a circular arc so that when one of such filters is inserted into one of the two measuring optical paths, the other measuring optical path is blocked; a first measurement cuvette in the first measuring optical path between the drum and the detector; a second measurement cuvette in the second measuring optical path between the drum and the detector; a rotating shutter disk inserted in the reference optical path and having a hole for passage of a reference beam; two electronic printed circuit boards having light-emitter receiver optical paths; a tab integral with the drum and bearing a hole interposed between the two electronic printed circuit boards and cooperating with the boards so as to selectively admit light emitter-receiver optical paths borne by said boards; and motor means for causing said shutter disk, said interference filter-bearing drum and said tab to rotate in a coordinate manner so as to individually select any one of the interference filters.