Detection of fields

US11353523B2 · kind B2 · utility

Assignee

• SINTEFF TTO AS · NO

Inventors

• Sverre Knudsen · Trondheim, NO
• Matthieu Lacolle · Nordnesøy, NO
• Øyvind Nistad Stamnes · Oslo, NO
• Sigbjørn Kolberg · Oslo, NO
• Zeljko Skokic · Oslo, NO
• Magnus Blihovde Hjelstuen · Trondheim, NO
• Jo Gjessing · Oslo, NO
• Andreas Vogl · Unterbechingen, DE
• Ib-Rune Johansen · Oslo, NO

Key dates

• Filing date: Oct 10, 2018
• Grant date: Jun 7, 2022
• Expiry date: Feb 13, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G01B2290/30
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A field detector (2) comprises a field-responsive element (10) which undergoes a dimensional change when exposed to a predetermined field; and an interferometric read-out arrangement arranged to detect the dimensional change of the field-responsive element. A light source (4) is arranged to provide a measurement beam reflected from the field-responsive element (10) and a reference beam not reflected from the field-responsive element (10), an optical detector (6) being disposed so as to detect at least part of an interference pattern produced by the measurement beam and the reference beam. The field-responsive element (10) has a shape comprising a curved surface and is constrained at least one edge (12) thereof such that the dimensional change causes the curved surface to be displaced in a direction which changes an optical path length of the measurement beam relative to the reference beam, thereby changing the interference pattern detected by said optical detector.