Refractometer

US7064816B2 · kind B2 · utility

Assignee

• Testo AG · DE

Inventors

• Markus Langenbacher · Lenzkirch, DE
• Andreas Derr · Donaueschingen, DE
• Frank Eder · Spaichingen, DE

Key dates

• Filing date: Dec 19, 2002
• Grant date: Jun 20, 2006
• Expiry date: Sep 18, 2023

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N21/431
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The invention relates to a portable refractometer comprising a depression (7) for samples, located on an insertion tip (11) in such a way that once the insertion tip (11) has penetrated a liquid or a fruit, a sufficient quantity of the sample liquid remains in the depression (7) for samples, thus wetting a measuring surface (4) that is delimited in said depression by a transparent body. The refractive index of the wetting liquid can be determined by measuring the intensity of an optical beam that is reflected by the measuring surface (4).