Aircraft real-time ice particle size analysis system

The output of an ice particle counter which was used to monitor the change in the ice crystal concentration within clouds was found to offer only a limited amount of real-time information. A new instrument that would use the same sensor but deliver an output more compatible with current and future needs was, therefore, designed. The system consists of six basic components, including a preamplifier located in the sensor pod, a power module that also forms the main frame in the cabin for the remaining system units, a digital clock module, a level detection and calibration module, a counting module, and an averaging module. A small thermal printer is also provided. It permits the operator to sample the output of each of the counting module channels and print a hard copy for future use.