Calibration of Johnson–Williams and PMS ASSP Probes in a Wind Tunnel

Abstract

Wet wind tunnel tests have provided calibrations and intercomparisons of the LAMP's cloud liquid water content probes (three Johnson–Williams sensor heads and one PMS ASSP). The tunnel liquid water content was deduced with a rotating cyclinder technique. The results show that the Johnson–Williams dynamic response is different according to the sensor head and control units that are used. The tests with the ASSP give an evaluation of the maximum airspeed beyond which the measurements am unreliable.