公开(公告)号：EP0452403B1

公开(公告)日：1995-03-22

申请号：EP90902079.4

申请日：1989-12-26

Applicant: UOP

Inventor： LEFEBRE, David, A.

IPC: G01J3/08

CPC classification number: G01J3/08 ,  G01J3/42 ,  G01J2001/182 ,  G01J2003/068 ,  G01N2201/04 ,  G01N2201/0833

Abstract: Spectrophotometric apparatus and methodology suitable for continuous and long-term use. The apparatus includes a monochromator (13) providing pre-dispersed monochromatic light to the optical inputs of a pair of fiber optic cables (34-37) and a translator (43) for alternatively positioning the fiber optic cables (34-37) at the same location with respect to the monochromator output. One of the cables (61) conducts light to a sample under study while the other cable (35b) provides a reference for light intensity measurements. The methodology includes the steps of performing two scans through the monochromator output for each measurement on the sample. The fiber optic cables are moved between scans so that the cable employed in the latter scan occupies the former position of the cable employed in prior scan.