Optical arrangement in spectrophotometers

US4165181A · kind A · utility

Assignee

• Bodenseewerk Perkin-Elmer GmbH · DE

Inventor

• Wolfgang Witte · Überlingen, DE

Key dates

• Filing date: May 16, 1977
• Grant date: Aug 21, 1979
• Expiry date: May 16, 1997

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N21/255
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In a spectrophotometer having a cuvette, a photoelectric detector having a photosensitive surface, a light source arranged for passing a light beam through the cuvette onto the photosensitive surface, an imaging optical system arranged between the cuvette and the photosensitive surface or a rear image thereof being located in a focal plane of the optical system outside the image plane of the light source, whereby the light beam impinges on the photosensitive surface as a relatively large light spot of substantially uniform illumination and, as a result, the location and size of the light spot is not adversely affected by parallel offset, and the demands as to accuracy and alignment of the cuvette are reduced.