Photometric process measurement arrangement and a photometric measurement method

Abstract

A photometric process measurement arrangement () comprising a photometric immersion probe (), the photometric immersion probe () comprising a photometer flashlight source () for providing photometric light impulses, a photometric detector arrangement () comprising at least two separate wavelength-selective detection elements (), and a photometer control () controlling the photometer flashlight source () and the detector arrangement (), the photometer control () comprising: impulse signal integrators () for integrating the electric impulses having the impulse intensity (Ui) generated by the detection elements () of one impulse integration cycle (), a measurement cycle control () for adapting the total number of integrated cycle impulses of an impulse integration cycle () to the impulse intensity (Ui) of the single electric impulses, A/D-converters () for converting the voltages of the impulse signal integrators () in an A/D conversion interval () after the impulse integration cycle (), a flashlight driving module () for controlling an impulse ignition switch () triggering the photometer flashlight source () with an impulse frequency (fi) during the impulse integration cycle (), and a flashlight thermal management module () for balancing the number of photometric light impulses within a time frame (F), for example, by adding an adapted pause interval () between the impulse integration cycles () depending on the number of integrated cycle impulses, so that the total number of photometric light impulses within the time frame (F) is substantially constant.