Arrangement including a plurality of optical fiber bragg grating sensors and method for determining measured values in such arrangement

US6765194B2 · kind B2 · utility

Assignee

• Daimlerchrysler AG · US

Inventors

• Michael Holz · Senden, DE
• Michael Trutzel · Blaustein, DE

Key dates

• Filing date: Mar 22, 2001
• Grant date: Jul 20, 2004
• Expiry date: Sep 14, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G01M5/0091
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An arrangement for determining measured values, in particular measured pressure values, strain values, or temperature value, using a plurality of optical fiber Bragg grating sensors. The optical fiber Bragg grating sensors are combined to form various arrays of optical fiber Bragg grating sensors that are arranged one behind the other, are connected by fiber optics, and exhibit different frequency selectivities. Delay elements are assigned to these arrays. The Bragg grating sensors receive a uniform query signal representing a time-differentiated, frequency-selective light. The frequency-selective Bragg grating sensors of the various arrays generate partial signals. The partial signals, separated temporally from one another by the delay elements, form a sequence of partial signals. From the knowledge of the propagation delays of the signals and from the knowledge of the frequency information of the query signal, the particular intended measured value is able to be related to a specific Bragg grating sensor of a specific array, thereby enabling the measured value to be allocated to the location of this Bragg grating sensor.