公开(公告)号：JPH02150748A

公开(公告)日：1990-06-11

申请号：JP26795589

申请日：1989-10-13

Applicant: BIO RAD LABORATORIES

Inventor： RAURU KAABERO ,  TAARENSU MAAREI

IPC: G01J3/42 ,  G01J3/45 ,  G01N21/27 ,  G01N21/35 ,  G01N21/552

Abstract: PURPOSE: To measure an absorption spectrum efficiently by penetrating the middle part of an optical fiber into a sample, transferring spectrum information to a detector, and using the phenomenon of an attenuated total reflection factor. CONSTITUTION: Beams from a source 17 generate beams 22 modulated by an interferometer 15. A lens 25a directs beams 22 toward one edge of a fiber 27, and a lens 25b captures light appearing from the other edge of the fiber 27 and directs it toward a detector 20. The fiber 27 has a first part 30a and a second part 30b at both edge sides and third part 32 at a middle. The third part 32 exposes a core and other parts 30a and 30b do not expose any core. Also, a course is provided for capturing light from the edge at the side of the lens 26b of the fiber 27 efficiently and for directing it toward the detector 20. In this case, the middle part 32 of the fiber 27 is penetrated through a sample 12, and the spectrum information is transferred to the detector 20. By using the phenomenon of attenuated total reflection factor, the absorption spectrum of the sample 12 can be measured easily and accurately.