Title:
FIBRE BRAGG GRATING MEASUREMENT METHOD AND SYSTEM
Document Type and Number:
WIPO Patent Application WO/2012/089816
Kind Code:
A3
Abstract:
The sensitivity of a fiber optical sensing assembly (2) with Fibre Bragg Gratings ( FBGs) (3, 4) to temperature variations in the associated light source (6) is reduced by using an interrogation system (1) with first and second sensors ( 12&15) that are connected to the sensing assembly (2) and to a reference element ( 14 ) to generate a measurement signal (M1, M2) and a reference signal, and a signal processing device (13), which identifies peaks (R1, R2) of the reference signal, compares a pattern of the identified peaks (R1, R2) with a known pattern of the reference spectrum to determine an order of wavelengths in the reference signal, and calculates for at least one peak an associated wavelength using the order of wavelengths in the reference signal, thereby avoiding that a different order of the peaks (R1, R2) in the reference signal, for instance due to temperature variations at the light source (6), results in false calculation of a wavelength in the measurement signal (M1, M2).
Inventors:
DEN BOER JOHANNIS JOSEPHUS (NL)
FRANZEN ANDRE (NL)
LUMENS PAUL GERARD EDMOND (NL)
FRANZEN ANDRE (NL)
LUMENS PAUL GERARD EDMOND (NL)
Application Number:
PCT/EP2011/074248
Publication Date:
August 23, 2012
Filing Date:
December 29, 2011
Export Citation:
Assignee:
SHELL INT RESEARCH (NL)
DEN BOER JOHANNIS JOSEPHUS (NL)
FRANZEN ANDRE (NL)
LUMENS PAUL GERARD EDMOND (NL)
DEN BOER JOHANNIS JOSEPHUS (NL)
FRANZEN ANDRE (NL)
LUMENS PAUL GERARD EDMOND (NL)
International Classes:
G01D3/028; G01D5/353
Domestic Patent References:
| WO2002012938A1 | 2002-02-14 | |||
| WO2005024349A1 | 2005-03-17 |
Foreign References:
| US20050134861A1 | 2005-06-23 | |||
| GB2419184A | 2006-04-19 |
Download PDF: