Vaisala Oyj

Atte Salmi

Jouni Ikonen

Panu Kopsala

Heikki Turtiainen

Jan Lönnqvist

Lasse Elomaa

Jaakko Korvenoja

Juhani Aspola

Riitta Luukkala, Legal Representative

The invention relates to a method and device for calibrating or testing the detector surface () of a measuring device () detecting hydrometeors. According to the method, impulses are focussed on the detector surface () in a controlled manner, the responses caused by the impulses, detected by the detector of the measuring device (), are measured, the measurement values of the responses are compared with the target values and the required corrections to the settings of the measuring device () are analyzed, and the measuring device () is adjusted on the basis of the analysis. According to the invention, an electromagnetic radiation pulse () of short duration is focussed on the detector surface (), whereby this causes a thermal-expansion reaction in the detector surface (), detected by the detector.

Method for calibrating or testing a detector surface of a device for detecting hydrometeors and a calibration and testing device

A method and apparatus in connection with a hydrometeor measuring device. According to the method, the amount of precipitation is determined with the aid of the number and size of the hydrometeors. The determining of the size of the hydrometeors is altered as a function of the prevailing atmospheric pressure, in such a way that, the higher the atmospheric pressure, the larger a hydrometeor with the same speed will be estimated to be.

Method and device for detecting hydrometeors

This publication discloses a method and apparatus for measuring hydrometeors. According to the method, the mechanical impulses of hydrometers falling on a detection surface are measured. According to the invention, part of the measuring device () is used to perform a continuous measurement, in order to define a threshold value for an impulse and only after the threshold value is exceeded is the final part () of the measuring apparatus excited for measuring operations, in order to minimize the power consumption of the apparatus.

Method and device for hydrometeor detection

The invention relates to a precipitation detector () and method for measurement of precipitation parameters. The detector () includes a frame (), a surface () mounted on the frame () and adapted to receive hydrometeors, and detection means () for converting the impact impulses of hydrometeors into an electric signal. According to the invention, the surface () receiving the impact of the hydrometeors is convex, stiff and rigidly connected to the detector frame () with the detection means () being permanently connected to the surface () receiving the impact of the hydrometeors.

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Porvoo, Finland

Atte Salmi