Spectral-band filtration spectrometry apparatus

US5424825A · kind A · utility

Assignee

• Dilor · FR

Inventors

• Michel Delhaye · Villeneuve-d'Ascq, FR
• Edouard Da Silva · Bucy-le-Roi, FR
• Gerard Martinez · Auxerre, FR

Key dates

• Filing date: Sep 30, 1992
• Grant date: Jun 13, 1995
• Expiry date: Sep 30, 2012

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2201/0642
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The filtration means filter the exciter radiation (EX) in a first forward direction from generator means (LS) to the specimen (EC), by allowing a second spectral band (BZ) of predetermined spectral width (l) and centered on a selected frequency corresponding to the wavelength of the exciter radiation (L0) to pass and stopping a first spectral band (FZ) complementary to the second spectral band (BZ), while substantially simultaneously with this first filtration operation, these filtration means further filter the analysis radiation (ON) in a second direction that is the reverse of the first direction, by allowing the first spectral band (FZ) to pass and stopping the second spectral band (BZ).