Research on Calibration Methods for Whirling and Sling Hygrometers

Abstract

This study introduces the measurement principle, structural types, and usage methods of whirling and sling hygrometers and compares them with laboratory hygrometers. It identifies the difficulties in calibrating these instruments. By examining how wind speed affects their measurements, this study proposes three different calibration methods for relative humidity and points out the advantages and disadvantages of each through theoretical analysis and practical calibration. This work provides valuable insights for unifying the value transfer system of whirling and sling hygrometers and guiding their calibration by metrological technical institutions.