公开(公告)号：US20180156664A1

公开(公告)日：2018-06-07

申请号：US15828512

申请日：2017-12-01

Applicant: SICK AG

Inventor： Julian EDLER ,  Thomas BEYER ,  Samson FRANK

IPC: G01J3/51 ,  G02B27/10 ,  G01J3/18

CPC classification number: G01J3/51 ,  G01J3/027 ,  G01J3/10 ,  G01J3/18 ,  G01J3/42 ,  G01N21/274 ,  G01N21/39 ,  G01N2021/399 ,  G02B27/10 ,  H01S3/1305

Abstract: A method of securing a modulation range of a wavelength-variable radiation source as part of the measurement of an absorption line of a substance comprises: the radiation source being controlled to transmit radiation such that the wavelength of the radiation runs through the modulation range in accordance with a time pattern; the radiation being filtered by means of a filter in whose pass band the absorption line is disposed and which has at least one filter flank whose actual wavelength is within the modulation range; a spectrum of the filtered radiation being determined in that the intensity of the filtered radiation is detected with respect to the time pattern; and a determination being made whether the spectrum has the at least one filter flank.