公开(公告)号：US09752931B2

公开(公告)日：2017-09-05

申请号：US14488608

申请日：2014-09-17

Applicant: SICK AG

Inventor： Torsten Waldmann ,  Rolf Disch

IPC: G01J3/02 ,  G01N33/00 ,  G01N21/3504 ,  G01J3/12 ,  G01J3/26 ,  G01J3/433

CPC classification number: G01J3/0205 ,  G01J3/0235 ,  G01J3/12 ,  G01J3/26 ,  G01J3/433 ,  G01J2003/1282 ,  G01N21/3504 ,  G01N33/0062

Abstract: A spectrometer (10) for gas analysis is provided, the spectrometer comprising a measurement cell (28) having a gas to be investigated, a light source (12) for the transmission of light (14) into the measurement cell (28) on a light path (16), a filter arrangement (22) having a Fabry-Perot filter (24a-c) in the light path (16), in order to set frequency properties of the light (14) by means of a transmission spectrum of the filter arrangement (22), as well as a detector (36, 38) which measures the absorption of the light (14) by the gas (30) in the measurement cell (28). In this connection the filter arrangement (22) has a plurality of Fabry-Perot filters (24a-c) arranged behind one another in the light path (14) and a control unit (44) for the filter arrangement (22) is provided in order to change the transmission spectrum by setting at least one of the Fabry-Perot filters (24a-c).