Improvement of stability of Raman backscattering  optical fiber temperature fire alarm system

WANG Xin-qun; HE Guo-min; DING Bang-qin; HUANG Xin

PDF( 1527 KB)

Open Access JUSTC

Improvement of stability of Raman backscattering optical fiber temperature fire alarm system

1.
State Key Laboratory of Fire Science, USTC, Hefei 230027, China
2.
Wuhan Institute of Safety and Environmental Protection, Sino-Steel Group, Wuhan 430081, China
3.
Quality and Safety Institute, China Jiliang University, Hangzhou 310018, China

Cite this:

Received Date: 30 March 2007
Rev Recd Date: 29 May 2007
Publish Date: 30 April 2009

Abstract Full text PDF

Abstract

Abstract

The parameters affecting the stability of Raman backscattering optical fiber temperature fire alarm systemwere analyzed, and methods to improve stability were applied. A new wavelength division multiplier (WDM) was used to extract the Raman scattering signal from a data fiber, which can reduce peak insertion loss and increase isolation significantly. Measures were taken to keep APD (avalanche photo diode) working at a constant temperature and at a low reverse voltage so as to maintain the avalanche multiplication at a constant gain. A special data acquisition card for Raman signal processing was adopted to improve time resolution. The result shows that the stability of the system was improved with the application of these measures.

Abstract

The parameters affecting the stability of Raman backscattering optical fiber temperature fire alarm systemwere analyzed, and methods to improve stability were applied. A new wavelength division multiplier (WDM) was used to extract the Raman scattering signal from a data fiber, which can reduce peak insertion loss and increase isolation significantly. Measures were taken to keep APD (avalanche photo diode) working at a constant temperature and at a low reverse voltage so as to maintain the avalanche multiplication at a constant gain. A special data acquisition card for Raman signal processing was adopted to improve time resolution. The result shows that the stability of the system was improved with the application of these measures.