Patent ID: 7286935

Claim:
A method in connection with a measuring device detecting hydrometeors, method comprising the steps of: measuring mechanical impulses of the hydrometeors falling on a detection surface, defining a threshold value for the impulses by using an initial part of the measuring device ( 1 ) to perform a continuous measurement, only after the threshold value is exceeded, exciting a final part ( 2 ) of the measuring apparatus for measuring operations, in order to minimize power consumption of the apparatus, filtering out mechanical disturbances from a signal representing one of the impulses exceeding the threshold value during processing, on the basis of one or more characteristic features of the signal, defining a first parameter of the one impulse in a first time window ( 10 ) after defining the threshold value, defining the same parameter from the one impulse in a second, later time window ( 11 ), comparing the first and second time-window parameters with each other, in order to eliminate a spurious signal, and creating a ratio between first ( 10 ) and second ( 11 ) time windows to be used as a limit value for the spurious signal.