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<br />. <br /> <br />17 <br /> <br />and later photographed. <br /> <br /> <br />Evidence for the presence of aircraft-produced ice particles <br /> <br /> <br />(APIPs) from flight through supercooled clouds was presented by <br /> <br /> <br />Rangno and Hobbs (1983). The results of studies by' Gordon and <br /> <br />Marwi tz (1986) using a tracer indicated that the King Air does not <br /> <br /> <br />produce any APIPs. Also, past studies of High Plains Experiment <br /> <br />(HIPLEX) and SCPP showed no evidence of APIPs. The mechanism of <br /> <br /> <br />APIPs, although unclear, does not appear to be important in this <br /> <br />study, but the definitive study has not been done on this subject. <br /> <br />. <br /> <br />e <br /> <br />. <br /> <br />. <br /> <br />e. <br /> <br />3.3 PRIMARY HFASUImtENT SYSTEMS <br /> <br />The measurement systems of primary significance to this study <br />are discussed in the following sections. <br /> <br />. <br /> <br />3.3.1 Liquid water content probes <br /> <br />-. <br /> <br />Two instruments were used for measur ing LWC: i) <br /> <br /> <br />Johnson-William (JW) (Bacharach Instruments Model LWH), and ii) <br /> <br /> <br />Forward Scattering Spectrometer Probe (FSSP) manufactured by <br /> <br /> <br />Particle Measuring Systems (PMS), Inc.. <br /> <br />The JW senses the resistance change in a constant-current wire <br /> <br /> <br />to sense cool ing due to liquid water. The JW prob~ has been <br /> <br /> <br />calibrated and intercompared with many other probes in the Ottawa <br /> <br />wind tunnel of the National Research Council of Canada (Strapp and <br /> <br />Schemenauer,1982). <br /> <br />. <br /> <br />. <br /> <br />_ <br /> <br />.1 <br /> <br />. <br />