Simultaneous double grating spectrometer with solid-state sensors or photomultiplier tubes

US6614528B1 · kind B1 · utility

Assignee

• SAI Gesellschaft fur analytische MeBgerate mbH · DE

Inventor

• Wolfram Bohle · Kleve, DE

Key dates

• Filing date: Nov 22, 1999
• Grant date: Sep 2, 2003
• Expiry date: Nov 22, 2019

Classification

• Technology area (CPC G): Physics
• CPC primary: G01J3/20
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In order to extend the available spectral range and to optimize spectral resolution while retaining a compact spectrometer setup, two diffraction gratings are operated with congruent focal curves in a Paschen-Runge geometry. The spectrometer features only one entrance slit and allows an adequate adaptation of the covered spectral range to the demands of analytical spectrometry. Apart from photomultiplier tubes commercial solid-state linear array sensors placed tangential at the Rowland circle are used for simultaneous detection of the spectrum. By employing angular cut cylindrical mirrors the radiation is deflected by 90% upward or downward in an alternating series. In this way two effects are achieved, an almost complete detection of the spectrum firstly and secondly a gain of intensity by focusing of radiation perpendicular to the plane of dispersion.