Frequency Response of the CSIRO Liquid Water Probe

S. G. Bradley Division of Cloud Physics, CSIRO, Sydney, Australia

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W. D. King Division of Cloud Physics, CSIRO, Sydney, Australia

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Abstract

A recent treatment of the dynamic behavior of anemometer hot wires is simplified and used to show that the response of the CSIRO liquid-water hot wire can be described by a second-order differential equation. This is confirmed by experiment, and it is shown that the inherent time scale is fully calculable in terms of the thermal properties of the wire and its support and the amplifier constants. For most clouds a response time of 0.005 s can be readily achieved.

Abstract

A recent treatment of the dynamic behavior of anemometer hot wires is simplified and used to show that the response of the CSIRO liquid-water hot wire can be described by a second-order differential equation. This is confirmed by experiment, and it is shown that the inherent time scale is fully calculable in terms of the thermal properties of the wire and its support and the amplifier constants. For most clouds a response time of 0.005 s can be readily achieved.

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