Optical sensing of measurands

US7440110B2 · kind B2 · utility

Assignee

• InvivoSense AS · NO

Inventors

• Dag Roar Hjelme · Trondheim, NO
• Arne Berg · Hønefoss, NO
• Reinold Ellingsen · Trondheim, NO
• Berit Falch · Trondheim, NO
• Astrid Bjørkøy · Trondheim, NO
• Dan Østling · Trondheim, NO

Key dates

• Filing date: Oct 18, 2002
• Grant date: Oct 21, 2008
• Expiry date: Apr 13, 2025

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2021/7779
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A chemical sensing probe comprises an optical fiber or may be mounted on an optical fiber. The probe has a chemically sensitive measuring material which exhibits a change in volume and/or a change in refractive index in the presence of a given chemical. The change in volume and/or refractive index gives a change in an optical path length through the probe which can be measured interferometrically.