An all-fiber Fabry-Perot interferometer for pressure sensing in different gaseous environments

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Susana Silva (Author) FCUP; Coelho, L (Author) Other; Frazao, O (Author) FCUP

Journal

Title: Measurement: Journal of the International Measurement Confederation

Vol. 47

Pages: 418-421

ISSN: 0263-2241

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 15 Citations

Scopus - 17 Citations

Other information

Authenticus ID: P-006-J2B

DOI: 10.1016/j.measurement.2013.09.028

Abstract (EN): A gas pressure sensor based on an all-fiber Fabry-Perot interferometer (FFPI) is reported. The sensing head consists of a small section of silica rod spliced with a large offset between two single-mode fibers. The silica rod is used only as mechanical support so that an air cavity can be formed between both SMF. It is shown that the FFPI sensor is sensitive to gas pressure variation and when submitted to different gaseous environments, namely carbon dioxide, nitrogen and oxygen - sensitivities of 6.2, 4.1 and 3.6 nm/MPa, respectively, were attained. The refractive index change on nitrogen environment by means of gas pressure variation was also determined and a sensitivity of 1526 nm/RIU was obtained. The response of the sensing device to temperature variations in air was also studied and a sensitivity of -14 pm/degrees C was attained.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4