EP 1198702 A4 20050202 - APPARATUS AND METHOD FOR GAS SENSING
Title (en)
APPARATUS AND METHOD FOR GAS SENSING
Title (de)
VORRICHTUNG UND VERFAHREN ZUM GASNACHWEIS
Title (fr)
APPAREIL ET PROCEDE DE DETECTION DE GAZ
Publication
Application
Priority
- NZ 0000118 W 20000703
- NZ 33655299 A 19990702
Abstract (en)
[origin: WO0102838A1] An apparatus for remote gas sensing comprises a light source, a polarising beam splitter (1), a photodetector, a single polarisation preserving optical fibre (2), a gas cell (5) or a zone through which the gas passes, a quarter-wave plate (6) and a mirror (7). A light beam from the light source passes through the beam splitter (1) and is focused by a lens (3) into the fibre (2) where it travels maintaining its polarisation state. Upon exiting the fibre (2), the light is collimated by a second lens (4) and propagates through the gas cell (5) and the quarter-wave plate (6) in a double pass configuration being retro-reflected by the mirror (7). The light beams is then focused back into the fibre (2) where it propagates with a polarisation state which is perpendicular to that of the forward propagating light. When light emerges from the fibre (2), it is reflected by the beam splitter (1) onto the photodetector.
IPC 1-7
IPC 8 full level
G01N 21/35 (2006.01); G08B 17/103 (2006.01); G01N 21/39 (2006.01)
CPC (source: EP)
G01N 21/3504 (2013.01); G08B 17/103 (2013.01); G01N 2021/1793 (2013.01); G01N 2021/391 (2013.01); G01N 2201/08 (2013.01)
Citation (search report)
- No further relevant documents disclosed
- See references of WO 0102838A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0102838 A1 20010111; AU 5719400 A 20010122; AU 768639 B2 20031218; EP 1198702 A1 20020424; EP 1198702 A4 20050202
DOCDB simple family (application)
NZ 0000118 W 20000703; AU 5719400 A 20000703; EP 00942591 A 20000703