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Titolo:
Remote multiple-point detection of methane in air by means of an optical fibre sensor system suitable for industrial applications
Autore:
Rabago, MAM;
Indirizzi:
Univ Cantabria, Grp Ingn Foton, Dept Tecnol Elect Ingn Sistemas & Automat,E-39005 Santander, Spain Univ Cantabria Santander Spain E-39005 Automat,E-39005 Santander, Spain
Titolo Testata:
QUIMICA ANALITICA
, volume: 19, anno: 2000, supplemento:, 1
pagine: 134 - 139
SICI:
0212-0569(2000)19:<134:RMDOMI>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
WAVELENGTH MODULATION; FREQUENCY-MODULATION; SPECTROSCOPY; LASER;
Keywords:
methane sensor; optical fibre system; distributed feedback laser; remote sensing; lower explosion level; digital signal processing;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: Rabago, MAM Univ Cantabria, Grp Ingn Foton, Dept Tecnol Elect Ingn Sistemas & Automat,Avda Castros S-N, E-39005 Santander, Spain Univ Cantabria Avda Castros S-N Santander Spain E-39005 Spain
Citazione:
M.A.M. Rabago, "Remote multiple-point detection of methane in air by means of an optical fibre sensor system suitable for industrial applications", QUIM ANAL, 19, 2000, pp. 134-139

Abstract

A complete system based on optical fibre technology for measuring methane concentration on multiple points in air is presented. It is based on derivative spectroscopy with first harmonic detection. The optical fibre channel makes it possible to lead the optical signals to and from 32 remote sensingheads without significant optical loss, while the optoelectronic part generating and processing the signals remains far from the areas where explosion risks can take place. A similar approach can be employed in sensing several molecular gases such as carbon monoxide, carbon dioxide, hydrogen sulphide, ammonia, nitrogen dioxide, or butane. Therefore, it is suitable for coal mines, petrochemical plants, and other chemical industries where toxic orflammable gas releases can cause serious damage to the health and securityof people and the installations. The system has multiple advantages in comparison with the traditional gas detection techniques, apart from the remote detection feature and the use of non-electrical signals in the proximity of the sensing area. It incorporates specially designed micro-optic sensingcells that improve the detection limit, and digital signal processing techniques are applied that enlarge its precision. The gas concentration is obtained in real time and it has a detection limit of 1% the lower explosion level (LEL) of methane in air on every sensing point. The non-linearity of the sensor is lower than 0.5% and the amplitude range is 100% the LEL. This way an alarm can be activated prior to the reach of a considerable amount of methane in the ambient.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 13:47:08