PROCESS FOR IN SITU TESTING AN ANALYTE MONITOR, AND ANALYTE MONITOR

A process for in situ testing an analyte monitor based on photoacoustic or photothermal detection comprising:a) providing an analyte monitor 1 at a measurement position relative to a target 2;b) setting an irradiation configuration Cirrad of a light source of the analyte monitor 1 comprising at least one triplet of irradiation parameters;c) irradiating the target 2 with the light source configured with the irradiation configuration at a plurality of irradiation time points and measuring for each time point at least an amplitude A(fmod, λ, P) and a phase ϕ(fmod, λ, P) for at least one triplet of irradiation parameters;d) calculating with a processor at least one correlation coefficient R(fmod, λ, P) between the amplitude and the phase for at least one triplet of irradiation parameters (fmod, λ, P) over a window period Twin comprising at least two irradiation time points;e) comparing at least one of the at least one correlation coefficient R(fmod, λ, P) with at least one threshold value Rthresh;f) providing a test result based on the result of the comparison.