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

A method for calibrating or testing a detector surface of a measuring device detecting hydrometeors, comprising the steps of:

• focusing impulses on the detector surface in a controlled manner;
• detecting responses caused by the impulses by a detector of the measuring device;
• measuring the detected responses by a measuring mechanism to obtain measurement values, wherein the measuring mechanism includes a processing unit connected to the measuring device and configured to receive the detected responses from the detector of the measuring device, and an energy meter configured to measure the impulses transmitted from the radiation source before arriving at the detector surface and generate a signal to the processing unit based on the measurement;
• comparing the detected responses received from the detector with the signal received from the energy meter to obtain a calibration coefficient;
• analysing required corrections to settings of the measuring device based on the calibration coefficient, and
• calibrating the detector surface of the measuring device by adjusting the settings of the measuring device on the basis of the analysis,
• wherein the impulses are electromagnetic radiation pulses of short duration transmitted from a radiation source to the detector surface, and the responses detected by the detector are thermal-expansion reactions.