System and method for use of dark field fourier diaphragm in multi-frequency imaging

US6762882B2 · kind B2 · utility

Assignee

• Agfa NV · BE

Inventors

• Volker Melzer · Munich, DE
• Tobias Damm · Hersbruck, DE
• Peter Mueller
• Ralph Thoma · Augsburg, DE

Key dates

• Filing date: Nov 14, 2002
• Grant date: Jul 13, 2004
• Expiry date: Nov 14, 2022

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B26/0808
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An imaging system is disclosed that includes an illumination source, a modulator and a variable Fourier diaphragm. The illumination source produces a first illumination field having a first frequency and a second illumination field having a second frequency. The modulator receives the first illumination field and the second illumination field, and produces a first modulated illumination field and a second modulated illumination fields. The variable Fourier diaphragm selectively passes one of the first modulated illumination field and the second modulated illumination field.