EP 2954311 A1 20151216 - PHOTOACOUSTIC CELL WITH IMPROVED DETECTION ACCURACY AND GAS ANALYSER COMPRISING SUCH A CELL
Title (en)
PHOTOACOUSTIC CELL WITH IMPROVED DETECTION ACCURACY AND GAS ANALYSER COMPRISING SUCH A CELL
Title (de)
PHOTOAKUSTISCHE ZELLE MIT VERBESSERTER NACHWEISGENAUIGKEIT UND GASANALYSATOR MIT SOLCH EINER ZELLE
Title (fr)
CELLULE PHOTO-ACOUSTIQUE A PRECISION DE DETECTION AMELIOREE ET ANALYSEUR DE GAZ COMPRENANT UNE TELLE CELLULE
Publication
Application
Priority
- FR 1351082 A 20130208
- EP 2014052171 W 20140204
Abstract (en)
[origin: WO2014122135A1] The present invention concerns a photo-acoustic cell (1), comprising: an acoustic resonator (2), said resonator comprising a resonator recess (3) in the form of a tube extending in a longitudinal detection (4); an input mirror (8) and an end mirror (10) aligned with the resonator (2) along an optical axis (5) of the cell parallel to the longitudinal direction (4); between the input mirror and the resonator, an input acoustic buffer (13); and between the end mirror and the resonator, an end acoustic buffer (14). According to a first aspect of the cell according to the invention, the lengths (63, 64) of the input and end acoustic buffers, measured in the longitudinal direction, are preferably asymmetrical. According to a second aspect of the cell according to the invention, the input mirror and the end mirror are preferably arranged to reflect a light beam (15) entering the cell through the input window (9) in the longitudinal direction, being centred on the optical axis, such that after each reflection on each of these mirrors, the reflected light beam remains centred on the optical axis (5). The invention also concerns a gas analyser comprising a cell according to the invention.
IPC 8 full level
G01N 21/17 (2006.01); G01N 29/24 (2006.01)
CPC (source: EP)
G01N 21/1702 (2013.01); G01N 29/2425 (2013.01); G01N 21/031 (2013.01); G01N 2021/1704 (2013.01); G01N 2291/021 (2013.01)
Citation (search report)
See references of WO 2014122135A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
WO 2014122135 A1 20140814; EP 2954311 A1 20151216; FR 3002040 A1 20140815; FR 3002040 B1 20170825
DOCDB simple family (application)
EP 2014052171 W 20140204; EP 14707340 A 20140204; FR 1351082 A 20130208