SELF-MIXING INTERFERFEROMETRY FOR ABSORPTION OR COLOR DETECTION AND APPLICATION IN LATERAL FLOW TESTING

摘要

It is proposed to use self-mixing interferometry for determining an absorption. The monitoring device for use in lateral flow testing for detecting presence or amount of an analyte (1) in a liquid (L) comprises a housing, the housing comprising a carrier holder for holding a carrier (10) for transport of the liquid (L); at least a first light source (41) which is a resonant-cavity light source having a cavity (C); and an evaluation unit (50), operationally connected to at least the first light source (41) for detecting a measurement signal. The first light source (41) is structured and arranged to illuminate with light a test range in a test area (13) of a carrier (10) held in the carrier holder; and to couple back into the cavity (C) of the first light source (41) a portion of the light coming back from the test range (13).